EP4558537A1 - Silane-terminated polymers - Google Patents

Abstract

The present invention relates to the use of a composition as a wood joint material. The composition comprises at least 20 wt.% of a silane-terminated polymer, the polymer backbone A of which is selected from the group consisting of a polycarbonate, a polyester, a copolymer containing a polyester and/or a polycarbonate, and a polymer containing at least one ester group and/or carbonate group. This polymer backbone A contains a plurality of diol monomer units, and at least 60% of these diol units have a diol of the general formula III HO-Z-OH (III), where Z is a saturated or unsaturated hydrocarbon chain which may optionally contain one or more heteroatoms selected from the group consisting of oxygen, sulphur and a tertiary nitrogen, characterised in that Z comprises (a) at least one side chain and/or (b) at least one cyclic ring system and/or (c) at least one double bond, and the composition is free from hardening catalysts or residues thereof selected from the group of base catalysts which have a pKa value which is greater than 15, preferably greater than 12, and from by-products which may be formed when a leaving group is split off during the silane termination of the polymer.

Description

Silane-terminated polymers

The present invention relates to the use of a composition containing silane-terminated polymers.

The silane-terminated polymers are produced using known methods. A known process includes, for example, the reaction of polyols, in particular hydroxyl-terminated polyethers, polyurethanes or polyesters as well as hydroxyl-functional polyacrylates, with isocyanatoalkylalkoxysilanes.

Another method involves a reaction of the above-mentioned polyols with di- or polyisocyanates, the latter being used in excess, so that isocyanate-functional polymers are produced in this first reaction step, which are then reacted in a second reaction step with alkoxysilanes which have an alkyl-bonded isocyanate-reactive group.

The use of wood, especially teak joints, places special demands on the sealant used. The expansion of the teak wood due to climatic or moisture conditions must be compensated for by the elastic joint compound without cracking or detachment from the wood. In addition, the sealant is expected to have no wear problems in addition to rapid curing and good mechanical properties. Due to the intensive exposure to the sun, good UV resistance and compatibility with oily wood such as teak must also be guaranteed.

W02006044970 discloses a composition that has a

Contains acid component and an amine component. The The resulting polyamides are used for jointing teak wood.

EP1657155 discloses a method for caulking a ship deck.

EP2157109A1 discloses a sealant using a polyurethane-polysiloxane prepolymer, which is made from at least bifunctional polyols with the addition of 1 to 90% by weight of a bifunctional carbinol- or aminoalkyl-terminated polydialkyl, polydiaryl or polyalkylarylsiloxane and an at least bifunctional aliphatic isocyanate is.

WO2015155355 discloses the use of an adhesive for filling wood joints, the wood being a natural or synthetic wood.

It has been shown in practice that silane-terminated polymers based on polyethers have insufficient UV resistance. Although silane-terminated polymers based on polyester and/or polycarbonate have high UV resistance, they often have lower storage stability.

US 2022/220245 discloses a composition with a silane-terminated polymer as a surface seal or joint material. However, the disclosed composition has reduced storage stability.

W02020094685 discloses a composition with a silane-terminated polymer as a surface seal or joint material. Isocyanate-free production has proven to be disadvantageous in applications that are exposed to high temperatures, as the reaction results in by-products such as:

Phenols are formed that cannot be removed from the final product. This problem has both ecological implications, as such substances can sweat out and enter the environment, as well as negative consequences for the quality of the end product as they lead to yellowing.

The object of the present invention was therefore to provide a composition containing silane-terminated polymers with improved storage stability and improved weather and in particular UV resistance, which do not contain any by-products that are ecologically questionable.

The task is solved by the composition according to the invention. Further preferred embodiments are the subject of the dependent claims.

It was found that the composition according to the invention contains at least 20% by weight of a silane-terminated polymer of the formula (I) or (II), where the weight percentages relate to the total content of silane-terminated polymers, and the composition contains a curing catalyst and is free of Hardening catalysts or their residues selected from the group of base catalysts which have a pKa value that is greater than 15, preferably greater than 12, are excellently suited as wood jointing material because they have both good storage stability and high weather and especially UV resistance. have consistency. The composition according to the invention allows damage to the wood caused by weather influences to be reliably avoided, thereby increasing its service life. In addition, the maintenance effort can be significantly reduced because the wood needs to be cared for less often. The combination of the branched diol monomer units and the choice of curing catalyst extend the storage stability significant. In addition, the polymers according to the invention are free of by-products that can arise from the elimination of a leaving group during silane termination of the polymer.

The joint can be of any thickness. The composition according to the invention can be used on all surface conditions, i.e. on smooth, structured or rough surfaces.

At least 60 mol% of the diol contained in the polymer backbone A

Monomer units of the silane-terminated polymer of the general formula I or II an do not have a linear, saturated alkylene group, but have at least one side chain, a ring system or a double bond. This steric change surprisingly leads to a significantly better one

Storage stability of the composition. By producing the silane-terminated polymer according to the invention of the general formula (I) or (II) and then curing the formulation with a primary, secondary or oligomeric aminoalkoxysilane, undesirable by-products can be avoided that can arise when the silane-terminated polymer is produced without isocyanate. Especially at high temperatures, such compounds can sweat out, which is ecologically disadvantageous and also negatively affects the quality of the wood joints. By avoiding these by-products, long-lasting, particularly visually convincing wood joints can be obtained, which is particularly important for window frames, shutters, wooden facades, terraces, balcony coatings and garden furniture. In the compounds of the general formulas I and II stands

- D for a linear or branched

Hydrocarbon group with 1 to 20

Hydrocarbon atoms, which can optionally be interrupted with heteroatoms selected from the group consisting of oxygen, nitrogen and sulfur,

- A for a polymer backbone which is selected from the group consisting of a polycarbonate, a polyester, a copolymer containing a polyester and/or a polycarbonate and a polymer containing at least one ester group and/or carbonate group, and wherein this polymer- Backbone A contains several diol monomer units,

- Ri, R ₂ , Ri' and R ₂ ' independently for a linear, branched or cyclic

Hydrocarbon radical with 1 to 10 carbon atoms, which optionally has one or more heteroatoms selected from the group consisting of oxygen, sulfur and nitrogen,

- n for the natural numbers 1, 2 or 3,

- x and y for natural numbers between 1 and 10,

- G for a linear or branched

Hydrocarbon group with 1 to 20

Hydrocarbon atoms, which can optionally be interrupted with heteroatoms selected from the group consisting of oxygen, nitrogen and sulfur,

- F for a linear, branched or cyclic organic radical which does not contain any groups reactive towards isocyanate,

- E for a functional group selected from the group consisting of NH, NR ₄ and S, and

- R ₄ represents a linear, branched or cyclic hydrocarbon radical with 1 to 10 carbon atoms, which can optionally comprise one or more heteroatoms selected from the group consisting of oxygen, sulfur and nitrogen.

In the present invention, a urethane catalyst is a catalyst that catalyzes the reaction of the hydroxy-terminated polymer backbone with an isocyanate-silane or a multifunctional isocyanate.

A curing catalyst is understood to mean a catalyst which catalyzes the reaction of the compound of the general formula I or II to form the cured surface seal or the cured joint material. The term “silane termination” is understood to mean the reaction step in which the terminal silane group is attached to a silane-terminated polymer. The leaving group formed during the elimination during silane termination of the polymer is a group of atoms that has a high electron density, which occurs during silane termination can be easily split off. Examples of such leaving groups are aromatic phenols.

At least 60 mol% of the diol contained in the polymer backbone A

Monomer units are a diol of general formula III

HO-Z-OH (III) where

Z is a saturated or unsaturated hydrocarbon chain which may optionally contain one or more heteroatoms selected from the group consisting of oxygen, sulfur and a tertiary nitrogen, characterized in that Z

(a) at least one side chain and/or

(b) at least one cyclic ring system and/or

(c) has at least one double bond.

The composition according to the invention contains a curing catalyst. However, the choice of the curing catalyst is crucial for the storage stability of the preparation according to the invention. It is free of curing catalysts which are selected from the group of base catalysts which have a pKa value which is greater than 15, preferably greater than 12. It was determined, that base catalysts, which are typically used for curing the polymers, have a negative impact on storage stability because they can lead to a breakdown of the polyesters or polycarbonates. For example, the frequently used cyclic amidine DBU, which has a pKa of 24.3 in MeCN, leads to a significant reduction in storage stability. In contrast, curing catalysts with a pKa value of less than 15, preferably less than 12, have no negative influence on storage stability.

The curing catalyst preferably contains an aminoalkoxysilane or consists of an aminoalkoxysilane or a mixture of aminoalkoxysilanes, since these also react into the polymer network and therefore cannot be washed out later. These also act as adhesion promoters. The term aminoalkoxysilanes is understood to mean, in particular, primary, secondary or oligomeric aminoalkoxysilanes. A primary aminoalkoxysilane is understood to mean a compound in which a primary amine is bound to the alkoxysilane group via a linker, while in a secondary aminoalkoxysilane a secondary amine group is bound to the alkoxysilane group via a linker. Examples of secondary aminoalkoxysilanes are N-butyl-3-aminopropyltrimethoxysilanes and N-methyl-3-aminopropyltrimethoxysilanes. Likewise, primary and secondary amino groups can be bound to the alkoxysilane group with a linker, such as N-(2-aminoethyl)-3-aminopropyltrimethoxysilane. An oligomeric aminoalkoxysilane is a chemical compound consisting of a chain or group of aminoalkoxysilane molecules linked together. An example of one Oligomeric aminoalkoxysilane is, for example, the oligomeric, diaminofunctional Dynasylan 1146 from Evonik or the 3-aminopropyltriethoxysilane dimer (DAPTES dimer). It consists of two molecules of the monomer 3-aminopropyltriethoxysilane.

Preferred curing catalysts are selected from the group consisting of 3-aminopropyltrimethoxysilane, 3-aminopropyldimethoxymethylsilane, 3-amino-2-methylpropyltrimethoxysilane, 4-aminobutyltrimethoxysilane, 4-aminobutyldimethoxymethylsilane, 4-amino-3-methylbutyltrimethoxysilane, 4-amino -3,3-dimethylbutyl-trimethoxysilane, 4-amino-3,3-dimethylbutyl-dimethoxymethylsilane, 2-aminoethyl-trimethoxysilane, 2-aminoethyl-dimethoxymethylsilane, aminomethyltrimethoxysilane, aminomethyldimethoxymethyl silane, aminomethylmethoxydimethylsilane and 7-amino-4-oxaheptyl-di- methoxymethylsilane, N-(2-aminoethyl)-3-aminopropyltrimethoxysilane, N-(2-aminoethyl)-3-aminopropylmethyldimethoxysilane, N-(2-aminoethyl)-3-aminopropyltriethoxysilane, 3-[2-(2- Aminoethylamino)-ethylamino]-propyltrimethoxysilane, 3-[2-(2-aminoethylamino)-ethylamino]-propyltriethoxysilane, 3-[2-(2-aminoethylamino)-ethylamino]-propylmethyldimethoxysilane,

[3-(1-Piperazinyl)propyl]triethoxysilane, [3-(1-Piperazinyl)propyl]trimethoxysilane, [3-(1-Piperazinyl)propyl]methyldimethoxysilane, N-(n-Butyl)-3-aminopropyltrimethoxysilane, N- (n-Butyl)-3-aminopropylmethyldimethoxysilane, N-(n-butyl)-3-aminopropyltriethoxysilane, N-ethyl-aminoisobutyl-trimethoxysilane, N-ethyl-aminoisobutylmethyldimethoxysilane, N-cyclohexyl-3-aminopropyltriethoxysilane, N-cyclohexyl-3 - aminopropyltrimethoxysilane, N-cyclohexylaminomethyltriethoxysilane, N-cyclohexylaminomethyltrimethoxysilane, N- Cyclohexylaminomethyldimethoxymethyl silane, bis(trimethoxysilylpropyl)amine and the oligomeric, diaminofunctional Dynasylan 1146 from Evonik.

Preferably, the curing catalyst contained in the composition is also free of a metal catalyst and its residues, since these can also have an unfavorable effect on storage stability. Examples of such metal catalysts are organotin compounds such as dibutyltin dilaurates, zinc (II) carboxylates, chromium (IV) carboxylates, bismuth (III) carboxylates and potassium (I) carboxylates.

As mentioned, the polymer backbone A is selected from the group consisting of polyesters, polycarbonates and copolymers containing a polyester and/or a polycarbonate. The term “copolymers containing a polyester and/or a polycarbonate” is understood to mean polymers that are composed of two or more monomer units. In addition to alternating copolymers and graft copolymers, the term also includes, in particular, block polymers which consist of longer sequences or blocks of each monomer and which can be linked to one another via linker connections. Preferred combinations of blocks are

- Polyester and polycarbonates

- Various polyesters

- Polyester and polyether as well

- Polycarbonates and polyethers.

The term “copolymer containing a polyester and/or a polycarbonate” means a copolymer which is at least contains a block made of a polyester and/or a polycarbonate and contains further blocks. In such a copolymer, the polyester content or the polycarbonate content is at least 10% by weight, preferably at least 25% by weight and most preferably at least 50% by weight.

When linked, preferred linker compounds form urethane, ester, urea and amide compounds, particularly preferably urethane compounds.

The polymer backbone A contains one or more ester and/or carbonate groups. They preferably contain more than 2, particularly preferably more than 10, ester and/or carbonate groups. Within the present invention, the definition of the polymer backbone A also includes polymers that are extended with a linker compound, such as polymers that are terminally extended with a diol, polymers that have been dimerized or oligomerized using a diisocyanate or dicarboxylic acid dichloride and copolymers, which were copolymerized using diisocyanates or dicarboxylic acid dichloride. Such polymers may have 1, 2 or preferably 3 or more ester and/or carbonate groups within the polymer backbone.

Z is a saturated or unsaturated hydrocarbon chain which may optionally contain one or more heteroatoms selected from the group consisting of oxygen, sulfur and a tertiary nitrogen, where Z

(a) at least one side chain and/or

(b) at least one cyclic ring system and/or

(c) has at least one double bond. In the present invention, the term side chain is understood to mean a branching of the saturated or unsaturated hydrocarbon chain. In a preferred embodiment, this is an electron donating group. Suitable examples of side chains are a Ci-Ci ₀ alkyl, a Ci-Cio alkenyl, preferably with a terminal double bond, a Ci to C ₁₀ alkoxyl, a Ci to C ₅ tertiary alkylamino group, an acrylate or a methacrylate. Alkenyl groups with a terminal double bond, acrylates and methacrylates have the advantage that the silane-terminated polymers produced from them can be further crosslinked by radiation.

In one embodiment, Z is an alkylene group that has one or more side chains. In the context of the present invention, the term “alkylene group” means a divalent hydrocarbon radical which preferably has 3 to 20 carbon atoms. This has at least one side chain. The side chain can be, for example, a Ci-C _lo alkyl, a Ci-Cio alkenyl, a Ci to C ₁₀ alkoxyl, a C _T to C ₅ tertiary alkylamino group, an acrylate or a methacrylate. Alkenyl groups with a terminal double bond, acrylates and methacrylates have the advantage that such silane-terminated polymers can be further radically crosslinked by radiation and heat.

In one embodiment, Z is an alkenylene group that may have one or more side chains. In the context of the present invention, the term alkenylene group means divalent hydrocarbon group with at least one double bond, which preferably has 3 to 20 carbon atoms. Examples of the optional side chains are, for example, Ci-Ci ₀ alkyl, a Cx-Cxo alkenyl, a to Ci ₀ alkoxyl, a Cibis C ₅ tertiary alkylamino group, an acrylate or a methacrylate.

In one embodiment, Z is a hydrocarbon chain containing at least one cyclic ring system. In the context of the present invention, the term “cycloalkylene group” means a divalent, saturated or partially unsaturated, monocyclic, bicyclic or polycyclic ring structure which may be unsubstituted or substituted. The cyclic ring structure can be connected to the OH groups of the diol of formula III either directly or via an alkylene group.

Z may be a saturated or unsaturated hydrocarbon chain containing one or more heteroatoms selected from the group consisting of oxygen (ie, forming an ether), sulfur (ie, forming a thioether or a thioester), and a tertiary nitrogen (ie, forming a tertiary amine), contains one or more side chains, which can be, for example, a Ci-C ₁₀ alkyl, a Ci-Cio alkenyl, a C ₁ to C ₁₀ alkoxyl, a C _x to C ₅ tertiary alkylamino group, an acrylate or a methacrylate.

The composition according to the invention is preferably free of phthalates. The composition according to the invention is compatible with a wide variety of plasticizers, which makes it possible to avoid the use of harmful phthalates. Preferred non-reactive plasticizers are, for example, alkanesulfonic acid phenyl esters such as Mesamoll from Lanxess, cyclohexanoate plasticizers such as Elatur DINCD from Evonik, 1,2-cyclohexanedicarboxylic acid diisononyl ester such as

Hexamoll DINCH from BASF and diesters of dicarboxylic acids such as dioctyl sebacate, dioctyl adipate or dioctyl azalate.

Depending on the substrate to be sealed, reactive plasticizers can also be used, such as various linear or branched alkyl silanes (for example N-octyl-trimethoxysilane, N-octyl-dimethoxymethylsilane), monofunctional silane-terminated polyether polyols (commercially available, for example, as Geniosil XM20, Geniosil XM25, SAT 145 , Silquest A-1230 silanes) or alternative monofunctional polymer chains can be added to the composition according to the invention.

The composition according to the invention contains at least 20% by weight of a silane-terminated polymer of the formula (I) or (II), the weight percentages being based on the total content of silane-terminated polymers. The other silane-terminated polymers contained in the composition can be, for example, silane-terminated polymers with a polymer backbone that is based on a polyether, polyacrylate or polyurethane. In one embodiment, the composition according to the invention contains at least 25% by weight, preferably 50% by weight, particularly preferably 75% by weight of the silane-terminated polymer of the formula (I) or (II), the weight percentages referring to the total content of silane-terminated polymers. The higher the proportion of silane-terminated polymers of the formula (I) or (II), the more the weathering resistance improves.

Possible embodiments include, for example, mixtures of silane-terminated polymers of the formula (I) and/or (II). Dimethoxy (methyl)silylmethylcarbamate-terminated

Polyethers, such as Geniosi1 STP-EIO or STP-E30 from Wacker;

Trimethoxysilylpropylcarbamate-terminated polyethers, such as Geniosil STP-E15 or STP-E35 from Wacker, Desmoseal S XP 2636, S XP 2749 from Covestro, Polymer NPT 20S from NPT, SPUR+ 1015 and SPUR+ 1050 from Momentive, Polymer ST 61 , Polymer ST 61LV, Polymer ST 80, Polymer ST 81 from Evonik, Risun 15000T, Risun 30000T from Risun;

Dimethoxymethylsilane-terminated polyether polymers, such as polymer S203H, S303H, SAX220, SAX260, SAX350, SAX 400 from Kaneka;

Trimethoxysilane-terminated polyether polymers, such as SAX510, SAX520, SAX530, SAX580, SAX 590 from Kaneka;

Acrylic-modified dimethoxymethylsilane-terminated polyether polymers, such as MAX602, MAX 923, MAX951 from Kaneka

Acrylic-modified trimethoxylsilane-terminated polyether polymers, such as MA490 from Kaneka;

Dimethoxysilane-terminated polyacrylates, such as XMAP SA100S, SAH OS, SA120S, SA310S, SA420S from Kaneka;

Trimethoxysilane-terminated polyurethanes, such as Desmoseal S XP 2458 or S XP 2821 from Covestro.

The composition according to the invention particularly preferably contains at least 20% by weight of a silane-terminated Polymers of the formula (I) or (II), where the weight percentages refer to the total content of silane-terminated polymers and contain a further silane-terminated polymer selected from the group consisting of dimethoxy (methyl)silylmethylcarbamate-terminated polyether and trimethoxysilylpropylcarbamate-terminated polyether and mixtures thereof are.

In a preferred embodiment of the present invention, the silane-terminated polymers of general formula I or II are linear polymers, i.e. x and y are 1. Alternatively, the silane-terminated polymers of general formula I or II can also be branched polymers. To produce this, a very small portion (approx. 1 molecule/polymer) of a triol or tricarboxylic acid is used.

In a preferred embodiment of the present invention, Z is a branched alkylene group. This branched alkylene group, i.e. saturated hydrocarbon group, contains at least one side chain. Particularly preferably, the at least one side chain of this alkylene group is selected from the group consisting of methyl, ethyl, propyl, butyl, acrylate and methacrylate, preferably methyl.

In a preferred embodiment, at least 75 mol%, preferably at least 90%, particularly preferably at least 95 mol% and ideally approximately all diol monomer units contain a diol of the general formula III. The higher the proportion of diols of the general formula III, the better the storage stability of the polymer of the formula I or II in the composition according to the invention. In one embodiment of the present invention, the diol of formula III is selected from the group consisting of neopentyl glycol, 1,2-propanediol, 1,4-cyclohexanedimethanol, 3-methyl-1,5-pentanediol, 2-methyl-2,4- Pentanediol, 2,5-hexanediol, 2-butyl-2-ethyl-1,3-propanediol, 2-methyl-1,3-propanediol, 3-ethyl-pentane-1,5-diol, 2,4-diethyl- l,5-pentanediol, 2,2,4-trimethyl-l,3-pentanediol, 2,3-butanediol, 2-ethyl 1,5-pentanediol, 2,2-dimethylpropane-l,3-diol, 2-ethyl - 1,3-hexanediol, 1,5-hexadiene-3,4-diol, 7-0cten-l,2-diol and (9Z,12Z)-18-[(6Z,9Z)-18-hydroxyoctadeca-6, 9-dienoxy]octadeca-9,12-dien-l-ol or a mixture thereof. Polymers of the general formula I or II, which contain the above-mentioned diol of the formula III, have particularly good stability. A particularly high level of stability could be achieved with 3-methyl-1,5-pentanediol. The production of such polymers is known to those skilled in the art.

In one embodiment of the present invention, A contains a polyester. This can be achieved, for example, by reacting a diol of the general formula III, such as diols selected from the group consisting of neopentyl glycol, 1,2-propanediol, 1,4-cyclohexanedimethanol, 3-methyl-1,5-pentanediol, 2-methyl-2 ,4-pentanediol, 2,5-hexanediol, 2-butyl-2-ethyl-1,3-propanediol, 2-methyl-1,3-propanediol, 3-ethyl-pentane-1,5-diol, 2,4 -diethyl-1,5-pentanediol, 2,2,4-trimethyl-1,3-pentanediol, 2,3-butanediol, 2-ethyl 1,5-pentanediol, 2,2-dimethylpropane-1,3-diol, 2-Ethyl-1,3-hexanediol, 1,5-hexadiene-3,4-diol, 7-0cten-1,2-diol and (9Z,12Z)-18-[(6Z,9Z)-18-hydroxyoctadeca -6,9-dienoxy]octadeca-9,12-dien-l-ol or mixtures thereof with at least one component containing carboxyl groups, selected from aliphatic acids with two carboxyl groups such as Succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, dodecanedioic acid, brassylic acid and dimer acids, or dialkyl esters of acids with two carboxyl groups such as dimethyl ester, diethyl ester, dipropyl ester and dibutyl ester or carboxylic acid chlorides such as acrylic or methyl acid chloride; alicyclic dicarboxylic acids such as 1,4-cyclohexanedicarboxylic acid or dialkyl ester acids with two carboxyl groups such as dimethyl ester, diethyl ester, dipropyl ester and dibutyl ester; aromatic acids with two carboxyl groups such as phthalic acid, isophthalic acid, terephthalic acid and naphthalenedicarboxylic acid or dialkyl esters of acids with two carboxyl groups such as dimethyl ester, diethyl ester, dipropyl ester and dibutyl ester and the like or mixtures thereof. The production of such polymers is known to those skilled in the art.

Of these examples, adipic acid, azelaic acid, sebacic acid, terephthalic acid, isophthalic acid and naphthalenedicarboxylic acid or mixtures thereof are preferably used. It is also possible to use cyclic carboxylic anhydrides such as phthalic anhydride, maleic anhydride, succinic anhydride or with a side chain such as 3-methyl-glutaric anhydride or mixtures thereof. Aliphatic dicarboxylic acid or its esters with side chains can also be used, such as 2,4-diethyl-glutaralic acid, 2,4-methyl-glutaralic acid, 3-methyl-glutaralic acid, methylmalonic acid or mixtures thereof. The diols as well as the dicarboxylic acids can be petroleum-based or made from renewable raw materials. The term polyester also includes polyesters that are formed by reacting diols of the general formula III with caprolactone. In one embodiment, the polymer backing A contains a polycarbonate. Polycarbonates can be produced, for example, by the reaction of diols of the formula III, such as diols selected from the group consisting of neopentyl glycol, 1,2-propanediol, 1,4-cyclohexanedimethanol, 3-methyl-1,5-pentanediol, 2-methyl-2 ,4-pentanediol, 2,5-hexanediol, 2-butyl-2-ethyl-1,3-propanediol, 2-methyl-1,3-propanediol, 3-ethyl-pentane-1,5-diol, 2,4 -diethyl-1,5-pentanediol, 2,2,4-trimethyl-1,3-pentanediol, 2,3-butanediol, 2-ethyl 1,5-pentanediol, 2,2-dimethylpropane-1,3-diol, 1,5-hexadiene-3,4-diol, 2-ethyl-l,3-hexanediol, 7-0cten-l,2-diol and (9Z,12Z)-18-[(6Z,9Z)-18-hydroxyoctadeca -6,9-dienoxy]octadeca-9, 12-dien-l-ol or mixtures of two or more thereof with diaryl carbonates, for example dimethyl, diethyl, diphenyl carbonate or phosgene. The production of such polymers is known to those skilled in the art.

The isocyanates of the formula (IV) used according to the invention

R ² _3-n (R ¹ 0) _n Si-D-NCO (IV) are commercially available products or can be produced using processes common in silicon chemistry. _{R _} 3, with the values 2 or 3 being preferred since the silane-terminated polymers produced from them have a particularly balanced reactivity.

Preferably R ¹ and R ² are independently alkyl radicals, such as methyl, ethyl, n-propyl, iso-propyl, n-butyl, iso-butyl, tert-butyl, n-pentyl, iso-pentyl, neo-pentyl, tert-pentyl, n-hexyl, n-heptyl, octyl, n-octyl, iso-octyl, 2 ,2,4-trimethylpentyl radical, n-nonyl radical, decyl radical, n-decyl radical, dodecyl radical or an n-dodecyl radical. But they can also represent alkenyl radicals, such as a vinyl or an allyl radical; Cycloalkyl radicals such as cyclopentyl, cyclohexyl, cycloheptyl and methylcyclohexyl radicals; Aryl radicals, such as the phenyl and naphthyl radicals; Alkaryl radicals, such as o-, m-, p-tolyl radicals, xylyl radicals and ethylphenyl radicals; Aralkyl radicals, such as the benzyl radical, the α- and the β-phenylethyl radical. Examples of substituted radicals R ¹ are alkoxyalkyl radicals, such as ethoxy and methoxyethyl radicals.

Preferably, each radical R ¹ and R ² , independently of one another, is a hydrocarbon radical with 1 to 6 carbon atoms, particularly preferably an alkyl radical with 1 to 4 carbon atoms, in particular the methyl or ethyl radical.

D represents a linear or branched hydrocarbon group with 1 to 20 hydrocarbon atoms, which can optionally be interrupted with heteroatoms selected from the group consisting of oxygen, nitrogen and sulfur. D is preferably selected from the group consisting of methylene, ethylene, propylene, butylene, methylene oxide, ethylene oxide and propylene oxide and particularly preferably from propylene or methylene, since this leads to polymers with a particularly balanced reactivity and these are easily available commercially.

Examples of isocyanates of the formula (IV) are isocyanatomethyl-dimethylmethoxysilane, isocyanato-propyl- dimethylmethoxysilane, isocyanato-methyl-methyldimethoxysilane, isocyanato-propyl-methyldimethoxysilane, isocyanato-methyl-trimethoxysilane, isocyanato-methyl-triethoxysilane,

Isocyanato-propyl-triethoxysilane and isocyanato-propyl-trimethoxysilane, with isocyanato-methyl-methyldimethoxysilane, isocyanato-propyl-methyldimethoxysilane, isocyanato-propyl-trimethoxysilane, isocyanato-propyl-triethoxysilane and isocyanato-methyl-triethoxysilane being preferred.

The process according to the invention for producing the silane-terminated polymer of the formula (II) is carried out by reacting a hydroxy-terminated organic polymer of the formula (III) where A represents the polymer back defined above, with a multifunctional isocyanate of the formula (VI) and subsequent reaction with an alkoxysilane of the formula (VII) in the presence of a urethane catalyst, wherein Ei is a reactive group reacting with the isocyanate group selected from the group consisting of NH ₂ , NHR ₃ and SH and F, m, Ri ', R ₂ ', n and G have the same definition as above have. It has been shown that this process, in contrast to isocyanate-free processes, leads to significantly better results, as toxicologically questionable release, by-products or degradation products can be avoided, which can also have a negative impact on the quality of the teak wood. The reaction with the multifunctional isocyanate of the formula (VI) is preferred at 60-150°C, particularly preferably at 60-120°C and the reaction with the alkoxysilane of the formula (VII) is preferred at 0-100°C, particularly preferably at carried out at 20-60°C.

The hydroxy-terminated organic polymer of the formula (III) preferably has an average molecular weight of 1,000-50,000 g/mol, in particular 2,000-25,000 g/mol, since the handling of these polymers is optimal, with a plasticizer optionally added in order to improve processability. In this document, “molecular weight” means the molar mass (in grams per mole) of a molecule. The “average molecular weight” is the number-average molecular weight Mn of a polydisperse mixture of oligomeric or polymeric molecules, which is usually determined by titrating the acid and OH numbers. Alternatively, it can also be determined using analytical methods such as GPC/MALDI. The OH number (hydroxyl number) is a measure of the content of hydroxy groups in polymers and is a quantity known to those skilled in the art. The acid number is a measure of the content of acid groups in polymers and is a quantity known to those skilled in the art.

Particularly suitable multifunctional isocyanates of the formula (VI) are isocyanates with two or more, preferably 2 to 10, isocyanate groups in the molecule. The known aliphatic, cycloaliphatic, aromatic, oligomeric and polymeric multifunctional isocyanates come into consideration for this, and these do not contain any groups that are reactive towards isocyanate, ie in particular have no free primary and/or secondary amino groups. A representative of the aliphatic multifunctional isocyanates is, for example hexamethylene diisocyanate (HDI); a representative of the cycloaliphatic multifunctional isocyanates is e.g. B. 1-Isocyanato-3-(isocyanatomethyl)-3, 5,5-trimethylcyclohexane.

Representatives of the aromatic multifunctional isocyanates include: 2,4- and 2,6-diisocyanatotoluene and the corresponding technical isomer mixture (TDI); Diphenylmethane diisocyanates, such as diphenylmethane-4,4 diisocyanate, diphenylmethane-2,4'-diisocyanate,

Diphenylmethane 2,2 '-diisocyanate and the corresponding technical isomer mixtures (MDI). Also worth mentioning are naphthalene 1,5-diisocyanate (NDI) and 4,4',4"

TriisocyanatotriphenyImethane. Alkoxysilanes of the formula (VII) are preferably selected from the group consisting of 3-aminopropyltrimethoxysilane, 3-aminopropyldimethoxymethylsilane, 3-amino-2-methylpropyltrimethoxysilane, 4-aminobutyltrimethoxysilane, 4-aminobutyldimethoxymethylsilane, 4-amino-3- methylbutyltrimethoxysilane,

4-amino-3,3-dimethylbutyl-trimethoxysilane, 4-amino-3,3-dimethylbutyl-dimethoxymethylsilane, 2-aminoethyl-trimethoxysilane, 2-aminoethyl-dimethoxymethylsilane,

Aminomethyltrimethoxysilane, aminomethyl dimethoxymethylsilane, aminomethylmethoxydimethylsilane and 7-amino-4-oxaheptyl-di-methoxymethylsilane, N-(2-aminoethyl)-3-aminopropyltrimethoxysilane, N-(2-aminoethyl)-3-aminopropylmethyldimethoxysilane, N-(2- Aminoethyl)-3-aminopropyltriethoxysilane, 3-[2-(2-

Aminoethylamino)-ethylamino]-propyltrimethoxysilane, 3-[2-(2-Aminoethylamino)-ethylamino]-propyltriethoxysilane, 3-[2-(2-Aminoethylamino)-ethylamino]-propyImethyIdimethoxysilane,

[3-(1-Piperazinyl)propyl]triethoxysilane, [3-(1-Piperazinyl)propyl]trimethoxysilane, [3-(1-Piperazinyl)propyl]methyldimethoxysilane, N-(n-Butyl)-3- aminopropyltrimethoxysilane, N-(n-butyl)-3-aminopropylmethyldimethoxysilane, N-(n-butyl)-3-aminopropyltriethoxysilane, N-ethyl-aminoisobutyl-trimethoxysilane, N-ethyl-aminoisobutylmethyldimethoxysilane, N-cyclohexyl-3-aminopropyltriethoxysilane, N -Cyclohexyl-3-aminopropyltrimethoxysilane, N-cyclohexylaminomethyltriethoxysilane, N-cyclohexylaminomethyltrimethoxysilane, N-cyclohexylaminomethyldimethoxymethylsilane, bis(trimethoxysilylpropyl)amine, 3-mercaptopropyltrimethoxysilane, 3-mercaptopropyltriethoxysilane and 3-mercaptopropylmethyldimethoxysilane.

The composition according to the invention preferably contains at least 0.1% by weight of a UV stabilizer in order to further improve the stability of the composition.

A further embodiment of the present invention relates to a composition according to the invention in which, if the diol of formula III is 3-methyl-1,5-pentanediol, the acid unit is not adipic acid.

Particularly good results could be obtained with the following silane-terminated polymers, which are selected from the group consisting of:

where A contains polyester units formed from monomer units selected from the group consisting of The polyesters formed in this way preferably have a molecular weight of 1000g/mol to 20,000g/mol.

The composition according to the invention is particularly preferably used for grouting hardwood, which is selected from the group consisting of tropical and subtropical woods, maple, apple, birch, pear, beech, yew, oak, ash, cherry and walnut. Particularly preferred tropical and subtropical woods are selected from the group consisting of acacia, bangkirai, balau, bongossi, doussie, iroko, ipe, mahogany, meranti, rosewood, sapele mahogany, sipo mahogany, teak and wenge. The composition according to the invention adheres extremely well to these woods and protects them reliably from the ingress of moisture. Thanks to its excellent UV resistance, it can also be used in sun-exposed locations.

The composition according to the invention is also suitable for grouting softer woods, in particular woods selected from the group consisting of alder, spruce, pine, larch, Douglas fir, linden, pitch pine and fir.

The composition according to the invention is particularly suitable for grouting highly oily and/or resinous woods. These are particularly challenging to grout because good adhesion is difficult to establish and the ingredients in the wood can greatly reduce the weathering stability of the grout. Examples of oily and/or resinous woods are teak, pitchpine, larch, spruce and iroko.

The composition according to the invention is particularly suitable for jointing wood and planks that are exposed to strong weather conditions, such as window frames, shutters, wooden facades, terraces, balcony coatings, Garden furniture, doors and surfaces in shipbuilding, especially for jointing ship planks.

The composition according to the invention also shows, in particular, good weathering stability and adhesion under the influence of sea or salt water.

The composition according to the invention shows thixotropic behavior and can be applied to both horizontal and vertical wooden surfaces. It is therefore particularly suitable as a joint agent for vertical joint seals and horizontal joint seals.

After application and curing, the composition according to the invention can be sanded, for example, with an eccentric sander or a belt sander. The composition according to the invention is particularly suitable for grouting teak planks. The construction of a teak deck requires first joining teak boards to the ship's lower deck, which are made of a metal (such as aluminum), a metal alloy (such as steel or painted steel), or a material that includes polyester (such as reinforced polyester), or wood (such as plywood) can be made. These teak planks can, for example, have a cuboid shape with a length between 10 cm and 5 meters, a width between 3 and 20 cm and a thickness between 4 mm and 4 cm. Teak planks can also be available in various other shapes depending on the particular geometry of the part of the ship's deck. They are generally supplied with different types of cross-sections, such as a rectangular cross-section or with a T-profile or an L-profile. After connecting the teak planks to the ship's lower deck, one remains between adjacent planks an empty space (also referred to as a seam) which essentially has the shape of a band with a width between 3 and 20 mm (preferably between 5 and 10 mm) and a depth between 6 and 10 mm. The seam is most often a straight band that is parallel to each side of the rectangular teak planks. In the case of teak planks having a shape other than cuboid, the seam follows the circumference of such planks and is not necessarily a straight band. Grouting these seams with the composition according to the invention prevents dust, dirt, moisture, chemicals or seawater from penetrating the seam. This can prevent damage or corrosion to the ship's deck or lower deck.

The composition according to the invention has, in particular, good stability against the acidic, neutral or basic treatment, cleaning and bleaching agents used on wood, such as oxalic acid solutions and sodium hydroxide solutions.

The composition according to the invention is also suitable for grouting wood-plastic composites (WPG). These materials can consist of 50% or more wood components.

The silane-terminated polymers according to the invention can also be formulated as a 2-component system. In addition to auxiliary materials, the second component also contains water, which greatly accelerates deep curing after mixing with the first component. Corresponding 2-component systems are known to those skilled in the art and are described, for example, in EP2009063 or EP2535376, the content of which is incorporated by reference. The compositions according to the invention can contain further auxiliaries and additives. These auxiliaries and additives include, for example, other silane-terminated polymers, plasticizers, stabilizers, antioxidants, fillers, reactive diluents, drying agents, adhesion promoters and UV stabilizers, rheological aids, color pigments, or color pastes and/or, if necessary, also to a small extent solvents. Such auxiliary materials and additives are known to those skilled in the art.

The preparation of the present invention can be black, white, colored or transparent, i.e. the color can be tailored to individual customer requirements. In order to obtain the desired color, it can also contain one or more color pigments.

Due to the high weathering stability, no discoloration of the joints or crack formation on the joint surface is observed, even after a longer period of weathering.

Examples

Example 1:

A silane-terminated Dynacoll 7250 (not according to the invention, polyester based on linear 1,2-ethanediol, linear 1,6-hexanediol and small amounts of 2,2-dimethyl-1,3-propanediol and adipic acid) is mixed with a silane-terminated Kuraray P according to the invention -6010 (3-methyl-1,5-pentanediol as a diol component, according to the invention and adipic acid as an acid component) compared:

Example 2:

The composition according to the invention according to Example 1 was compared with a composition consisting of silane-terminated polyether polymers and was applied as a joint between two teak planks, sanded with an eccentric sander and stored in a xenon weathering device. While the joint based on silane-terminated polyethers showed the first cracks after just 2,000 hours of artificial weathering, the composition based on silane-terminated polyesters is still undamaged even after 8,000 hours.

Mixtures of the composition according to the invention with a proportion of silane-terminated polyether polymers also show significantly better weathering stability than compositions based on pure silane-terminated ones Polyether polymers or pure silane-terminated polyurethane polymers.

Example 3

The stability of the polymers according to the invention was compared with those with a higher polyether content:

REPLACEMENT SHEET (RULE26) The following tests were carried out with the composition according to the invention and the comparison compositions:

Discoloration of the compound (black product / white product) in contact with teak wood, sanding of the compound after 24h/48h curing, treatment with/without teak oil. Weathering in the xenon test device.

It was shown that the weathering stability decreases significantly with a higher proportion of polyether polymer (Wacker STP-E35).

Example 4:

The example shows the influence of the catalyst and the influence of the diol monomer units, which have a side group, on the storage stability.

Materials used:

Dynacoll® 7250 (Evonik): linear polyester polyol made from 1,2-ethanediol (unbranched), 1,6-hexanediol (unbranched),

2,2-Dimethyl-1,3-propanediol (branched) with adipic acid, the polyol having an average molar mass of 5,500g/mol. According to NMR analyses, Dynacoll 7250 contains approx. 17mol% of branched diol (2,2-dimethyl) based on the diol components.

1.3-propanediol).

Dynacoll® 7231 (sold by Evonik): linear polyester polyol made from 1,2-ethanediol (unbranched), 1,6-hexanediol (unbranched), 2,2-dimethyl-l,3-propanediol (branched) with adipic acid, terephthalic acid and Isophthalic acid, the polyol having an average molar mass of 3,500g/mol.

REPLACEMENT SHEET (RULE26) Dynacoll® 7230 (sold by Evonik): linear polyester polyol made from 1,2-ethanediol (unbranched), 1,6-hexanediol (unbranched), 2,2-dimethyl-l,3-propanediol (branched) with adipic acid, terephthalic acid and Isophthalic acid, the polyol having an average molar mass of 3,500g/mol.

The modification of the hydroxy-terminated polyols to silane-terminated polymers was carried out after prior drying at 100 ° C in a vacuum as follows: breaking the vacuum with nitrogen. Cool under N2 to 80°C. Addition of urethane catalyst in the form of a mixture of cobalt (II) neodecanoate in white spirit, whereby the content of cobalt (II) ions was chosen according to the reactivity of the prepolymers and was between 4-10 ppm. After homogenization, an equimolar amount of 3-(trimethoxysilyl)propyl isocyanate was added. The reaction was allowed to run at 80°C until the isocynate band, which is detectable in the FTIR analysis at around 2270 cm-1, had reacted completely. The products were then drained into a tight storage container and stored under nitrogen until further processing took place according to the examples.

REPLACEMENT SHEET (RULE26)

REPLACEMENT SHEET (RULE26)

REPLACEMENT SHEET (RULE26)

REPLACEMENT SHEET (RULE26)

REPLACEMENT SHEET (RULE26) nc = normal climate, 23°C / 50% rh

(*) no curing

(*2) >90% cohesive failure (*3) <40% cohesive failure

(*4) 40 - 90% cohesive failure

K-KAT 670 (sold by King Industry): Zinc Carboxylate/DBU

REPLACEMENT SHEET (RULE26) mixture

TIB-KAT 616 (sold by TIB Chemicals): Zinc neodecanoate

TIB-KAT 716 (sold by TIB Chemicals): Bismuthcarboxy1ate DBU (n.a.): Diazabicycloundecene

Claims

Patent claims 1. Use of a composition containing at least 20 % by weight of a silane-terminated polymer of the formula (I) or (II) as wood joint material, whereby the weight percentages refer to the total content of silane-terminated polymers, D represents a linear or branched hydrocarbon group with 1 to 20 hydrocarbon atoms, which can optionally be interrupted with heteroatoms selected from the group consisting of oxygen, nitrogen and sulfur, -M- A represents a polymer backbone which is selected from the group consisting of a polycarbonate, a polyester, a copolymer containing a polyester and/or a polycarbonate and a polymer containing at least one ester group and/or carbonate group, and wherein this polymer Backbone contains multiple diol monomer units, Ri, R ₂ , RI' and R ₂ ' independently for a linear, branched or cyclic is a hydrocarbon radical with 1 to 10 carbon atoms, which can optionally comprise one or more heteroatoms selected from the group consisting of oxygen, sulfur and nitrogen, n is equal to 1, 2 or 3, x and y are natural numbers between 1 and 10, G represents a linear or branched hydrocarbon group with 1 to 20 hydrocarbon atoms, which can optionally be interrupted with heteroatoms selected from the group consisting of oxygen, nitrogen and sulfur, F is a linear, branched or cyclic organic radical that does not contain any isocyanate-reactive groups, E is a functional group selected from the group consisting of NH, NR ₄ and S, where R ₄ represents a linear, branched or cyclic hydrocarbon radical with 1 to 10 carbon atoms, which may optionally comprise one or more heteroatoms selected from the group consisting of oxygen, sulfur and nitrogen, characterized in that at least 60% of those contained in the polymer backbone A Diol monomer units a diol of the general formula III HO-Z-OH (III), are, where Z a saturated or unsaturated Hydrocarbon chain, which can optionally contain one or more heteroatoms selected from the group consisting of oxygen, sulfur and a tertiary nitrogen, characterized in that Z (a) at least one side chain and/or (b) at least one cyclic ring system and/or (c) has at least one double bond and the composition contains a curing catalyst and is free i. of curing catalysts or their residues selected from the group of base catalysts which have a pKa value that is greater than 15, preferably greater than 12, and ii. of by-products that can arise from the elimination of a leaving group during silane termination of the polymer. 2. Use according to claim 1, characterized in that the composition is free of phthalate. 3. Use according to one of the preceding claims, characterized in that the curing catalyst contained in the composition contains an aminoalkoxysilane or consists of an aminoalkoxysilane or a mixture of aminoalkoxysilanes. 4. Use according to one of the preceding claims, characterized in that the composition contains a curing catalyst which is additionally free of a metal catalyst or its residues. 5. Use according to one of the preceding claims, characterized in that Z has at least one side chain. 6. Use according to one of the preceding claims, characterized in that Z is an alkylene group with at least one side chain. 7. Use according to one of the preceding claims, characterized in that at least 75%, preferably at least 90%, particularly preferably at least 95% and ideally approximately all of the diol monomer units contained in the polymer backbone A contain a diol of the general formula III. 8. Use according to one of the preceding claims, characterized in that the side chain is selected from the group consisting of methyl, ethyl, propyl, butyl, acrylate and methacrylate, preferably methyl. Use according to one of the preceding claims, characterized in that the diol of formula III is selected from the group consisting of neopentyl glycol, 1,2-propanediol, 1,4- Cyclohexanedimethanol, 3-methyl-l,5-pentanediol, 2-methyl- 2,4-pentanediol, 2,5-hexanediol, 2-butyl-2-ethyl-l,3-propanediol, 2-methyl-l,3-propanediol, 3-ethyl-pentane- 1,5-diol, 2,4-diethyl-1,5-pentanediol, 2,2,4-trimethyl- 1,3-pentanediol, 2,3-butanediol, 2-ethyl-1,5-pentanediol, 2,2-Dimethylpropane-1, 3-diol, 1,5-hexadiene-3,4-diol, 7- Octene-1,2-diol and (9Z,12Z)-18-[(6Z,9Z)-18-hydroxyoctadeca-6, 9-dienoxy]octadeca-9,12-dien-l-ol or a mixture thereof. Use according to one of the preceding claims, wherein the silane-terminated polymers are selected from wherein the polymer backbone A contains polyester units formed from monomer units selected from the group consisting of: 1. Use according to one of the preceding claims, characterized in that A contains a polyester. 12. Use according to one of the preceding claims, characterized in that A contains a polyester carbonate. 13. Use according to one of the preceding claims, characterized in that the composition contains at least 25% by weight, 50% by weight, preferably 75% by weight of a silane-terminated polymer of the formula (I) or (II), the percentages by weight being: refer to the total content of silane-terminated polymers. 14. Use according to one of the preceding claims, wherein the composition additionally contains one or more color pigments. 15. Use according to one of claims 1 to 14 for grouting hardwood, preferably a tropical or a subtropical hardwood, particularly preferably teak. 16. Use of one of claims 1 to 14 for grouting highly oily woods. 17. Use according to one of claims 1 to 14 as Joint seal, preferably vertical Joint seals and horizontally extending joint seals and in particular joint seals Teak planks.