JP2533117B2 - Resin composition for paint - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to pigment dispersibility which is a characteristic of polyester resin, hardness and weather resistance which are characteristic of flexibility and acrylic resin,
The present invention relates to a solvent-based coating composition that provides an excellent coating film having both stain resistance and chemical resistance.

(Prior Art) A resin mixture obtained by combining a curing agent with a polyester resin or an acrylic resin as a base resin and dissolving it in a suitable solvent is used as a solvent-type thermosetting coating material for household appliances,
Widely used for pre-coated metal, automobiles, cans, etc.

When a polyester resin is used as the base, the dispersibility of the pigment used for coloring is good and a smooth glossy coating film can be obtained. In addition, the flexibility of the coating film is excellent, so post processing after coating is required. It is used for precoat metal, intermediate paint for automobiles that requires resistance to flying stones, and solid color topcoat for automobiles that requires beautiful color and suitability for various pigments.

On the other hand, when an acrylic resin is used as the base, a coating film having excellent hardness, weather resistance, stain resistance, and chemical resistance can be obtained, so that it is used for home appliances, automobile metallic color top coating, etc. There is.

(Problems to be Solved by the Invention) The polyester or acrylic thermosetting paints which are used by making use of their respective characteristics in many applications are naturally required to have their respective characteristics. For example,
There is a strong demand for shortening the manufacturing process by using pre-coated steel sheets for home electric appliances. In this case, the paint used for pre-coated steel sheets has the flexibility of the polyester coating for pre-coating that has been conventionally used, as well as home electric appliances. It has been required to have the stain resistance of the acrylic paints that have been conventionally used for use, and at present, paints that satisfy both performances have not appeared.

In addition, when it is used as an intermediate coating for automobiles or a solid color topcoat where polyester coatings are used, there are defects in weather resistance such as peeling and chalking, and acrylic coatings are being investigated to improve this. However, this has a drawback in pigment dispersibility and the like, and a coating material having both excellent points has not yet appeared.

Polyester resin and acrylic resin have poor compatibility, and when they are simply blended and used, phase separation occurs when they are dissolved in a solvent, and a uniform resin solution cannot be obtained, so that they cannot be put to practical use as paints. In order to solve this point, a technique of graft-polymerizing an unsaturated polyester and an acrylic monomer has been published (Japanese Patent Laid-Open No. 57-202354), but it is not possible to combine the features of polyester and acrylic resin in a wide range of performances. Can not.

The present invention provides a novel hybridized polyester resin and acrylic resin in order to achieve the excellent characteristics of each of the coating resins using the polyester resin and the acrylic resin as the base resin, which are used as the melt-type thermosetting coating. It is an object of the present invention to provide a resin composition for a solvent type coating material using a resin.

(Means for Solving the Problems) The inventors of the present invention have diligently studied a hybrid resin composition of both systems that makes use of the excellent features of both polyester and acrylic coating materials, and as a result, have conducted a transesterification reaction on both resins. The present invention has been accomplished by finding that a resin composition can be obtained which becomes a uniform solution even when it is dissolved in a solvent by virtue of this, and thereby a solvent-based coating material having the excellent features of both systems can be obtained.

That is, the present invention has a hydroxyl value of 5 to 200 KOHmg / g polyester resin 5 to 95 parts by weight and a hydroxyl value of 5 to 200 KOHmg / g.
95 to 5 parts by weight of acrylic resin of 10 at a temperature of 180 to 280 ℃
A solvent characterized by comprising a resin composition (A) which is a uniform solution when dissolved in a solvent by transesterification for 5 minutes to 5 hours and a curing agent (B) which is an amino resin and / or an isocyanate resin. A resin composition for mold coating.

The polyester resin used in the present invention is required to have a hydroxyl value of 5 to 200 KOHmg / g, and 20 to 150 KOH.
It is preferably mg / g. If the hydroxyl value is less than 5 KOHmg / g, the reaction with the acrylic resin does not proceed sufficiently, the compatibility is poor, the resin solution becomes cloudy, and phase separation occurs. Also, the hydroxyl value is 200 KOH
If it exceeds mg / g, the reaction with acrylic resin will proceed rapidly.
It is easy to gel and control the reaction is difficult, and gel is partially formed, and a uniform solution cannot be obtained. The hydroxyl groups other than those involved in the reaction with the acrylic resin act as a cross-linking reaction group with the curing agent.

Such polyester resin, for example, terephthalic acid, isophthalic acid, phthalic anhydride, naphthalenedicarboxylic acid, succinic acid, glutaric acid, adipic acid, azelaic acid, 1,10 decanedicarboxylic acid, cyclohexanedicarboxylic acid, trimellitic acid as a carboxylic acid component. Acid, maleic acid,
Polyvalent carboxylic acids such as fumaric acid and lower alcohol esters thereof, hydroxycarboxylic acids such as paraoxybenzoic acid and monovalent carboxylic acids such as benzoic acid can be used.

Further, as the alcohol component, for example, ethylene glycol, diethylene glycol, 1,3-propanediol,
1,3-butanediol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, 1,10-decanediol, 3-methyl-pentanediol, 2,2'-
Diethyl-1,3-propanediol, 2-ethyl 1,3-hexanediol, neopentyl glycol, trimethylolethane, trimethylolpropane, glycerin, pentaerythritol, ethylene oxide adduct of bisphenol A, propylene oxide addition of bisphenol A Compounds, hydrogenated bisphenol A ethylene oxide adducts, hydrogenated bisphenol A propylene oxide adducts, and the like.

Further, it is a matter of course that flaxseed oil, tung oil, safflower oil, dehydrated castor oil, cottonseed oil, coconut oil and fatty acids thereof can be used if necessary.

Such a polyester resin can be obtained by a general transesterification method or a direct esterification reaction of one or more kinds of the above-mentioned carboxylic acid component and one or more kinds of the above-mentioned alcohol component.

The number average molecular weight of the polyester resin measured by the GPC method is preferably 500 to 10,000.

The acrylic resin used in the present invention has a hydroxyl value of 5
~ 200KOHmg / g, 20 ~ 150KOHmg / g
It is preferred that When the hydroxyl value is less than 5 KOHmg / g,
The reaction with the polyester resin does not proceed sufficiently, the compatibility is poor, the resin solution becomes turbid, and phase separation occurs. Also, the hydroxyl value is 200 KOH
If it exceeds mg / g, the reaction with acrylic resin will proceed rapidly.
It is easy to gel and control the reaction is difficult, and gel is partially formed, and a uniform solution cannot be obtained.

For such an acrylic resin, hydroxyethyl (meth) acrylate, hydroxypropyl (meth) acrylate, hydroxybutyl (meth) acrylate, 1,4-butanediol mono (meth) acrylate and the like can be used as the hydroxyl group-containing monomer.

(Meth) acrylic acid, itaconic acid, maleic acid, fumaric acid and itaconic acid, maleic acid, lower alcohol-modified monoalkyl ester of fumaric acid and methyl (meth) acrylate, ethyl (meth)
Acrylate, propyl (meth) acrylate, n-butyl (meth) acrylate, isobutyl (meth) acrylate, tert-butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, stearyl (meth)
Acrylate, tridecyl (meth) acrylate, cyclohexyl (meth) acrylate, benzyl (meth) acrylate, phenyl (meth) acrylate, glycidyl (meth) acrylate, α-methylglycidyl (meth) acrylate, β-methylglycidyl (meth) acrylate, Esters of acrylic acid and methacrylic acid such as dimethylaminoethyl (meth) acrylate and diethylaminoethyl (meth) acrylate can be used. Other copolymerizable monomers, styrene, α-methylstyrene, vinyltoluene, acrylonitrile, methacrylonitrile, vinyl acetate, vinyl propionate, acrylamide, methacrylamide, methylol acrylamide, methylol methacrylamide, vinyl chloride, propylene, Examples thereof include ethylene and C _{4 to} C ₂₀ α-olefins.

Such an acrylic resin can be produced by any known polymerization method such as a solution polymerization method, a suspension polymerization method, a bulk polymerization method and an emulsion polymerization method. At that time, as a polymerization initiator, azobisisobutyronitrile, 4,4′-azobis (4-cyanopentanoic acid), benzoyl peroxide, t-butylperoxy-2-ethylhexanoate, cumene hydroperoxide, Potassium persulfate, hydrogen peroxide, 2,2'-azobis [2-methyl-N- (2-hydroxyethyl) propioamide, etc. can be used,
Further, if necessary, dodecyl mercaptan, mercaptoethanol, etc. can be used as a chain transfer agent.

The number average molecular weight of acrylic resin measured by GPC method is 5
00 to 20,000 is preferable.

The resin composition (A) of the present invention is a resin composition in which the polyester resin and the acrylic resin are mutually transesterified. If the composition contains more than 95 parts by weight of polyester resin or less than 5 parts by weight of acrylic resin,
Only the characteristics of the polyester resin are emphasized and it is not possible to form an excellent coating film having the features of both resins, which is the object of the present invention. On the contrary, when the acrylic resin is more than 95 parts by weight or the polyester resin is less than 5 parts by weight, only the characteristics of the acrylic resin are emphasized and the object of the present invention cannot be achieved.

The resin composition (A) of the present invention is a polyester resin 5
180 parts by mixing 95 parts by weight and acrylic resin 95-5 parts by weight
It can be produced by reacting the ester group and the hydroxyl group present in both resins at a temperature of 280 ° C. for 10 minutes to 5 hours, preferably 30 minutes to 3 hours, under a condition capable of performing a transesterification reaction.

The above-mentioned transesterification reaction in the present invention is such that the following two reactions proceed at the same time, and the reactions are schematically shown below.

The reaction is a transesterification dealcoholization reaction, the reaction is a transesterification reaction, and the cleavage and recombination of the polymer chain is repeated at the cleavage portion in the schematic diagram, and the compatibilization of the acrylic resin component and the polyester resin component and Uniformity is promoted when dissolved in a solvent. The above-mentioned transesterification reaction does not necessarily have to proceed completely, and only a part thereof may have reacted. Then, it is possible to obtain a resin solution by charging a suitable solvent, further butylated melamine, methylated melamine, butylated urea, amino resins such as methylated urea or hexamethylene diisocyanate, isophorone diisocyanate, toluene diisocyanate,
Xylylene diisocyanate or water adducts thereof,
By reacting a polyvalent isocyanate compound such as a trimethylolpropane adduct or an isocyanurate with 0.1 to 5% by weight of the resin solid content, the hydroxyl groups remaining in the acrylic resin and the polyester resin can be bonded to each other to promote the reaction.

Examples of the solvent of the resin composition (A) of the present invention include aromatic solvents such as toluene and xylene, ester solvents such as ethyl acetate, butyl acetate or cellosolve acetate,
Ketone solvents such as methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, n-butanol, iso-
An alcohol solvent such as butanol or butyl cellosolve, an ether solvent such as dioxane or tetrahydrofuran, and a chlorine solvent such as tetrachloroethane can be used alone or in combination.

The resin composition (A) obtained by partially transesterifying the polyester resin and the acrylic resin of the present invention with each other becomes a uniform resin solution when dissolved in the above-mentioned solvent and undergoes phase separation even when left standing and stored. There is no. When the phases are separated to form a non-uniform solution, a coating film having a smooth and excellent gloss cannot be obtained when it is used as a paint.

Further, in the present invention, an amino resin and / or an isocyanate resin is used as the curing agent (B). The amino resin is a resin synthesized from at least one kind of melamine, urea, benzoguanamine, glycoluril and formaldehyde and has a methylol group of 1 or less by a lower alcohol such as methanol, ethanol, propanol, isopropanol, butanol or isobutanol. Part or all of which is alkyl etherified is used.

As the isocyanate resin, a polyvalent isocyanate,
A polymer obtained by reacting a polyvalent isocyanate such as a polymer of a polyvalent isocyanate or an adduct of a polyvalent isocyanate with a polyhydric alcohol and a blocking agent described later to eliminate the isocyanate group active at room temperature is used.

As the polyvalent isocyanate, tolylene diisocyanate, metaphenylene diisocyanate, naphthylene diisocyanate, xylylene diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, dicyclohexylmethane diisocyanate, dicyclohexyl propane diisocyanate, trimethylpentane diisocyanate, etc. aromatic, aliphatic or alicyclic Group polyvalent isocyanates are exemplified.

Examples of the blocking agent include lactams such as ε-caprolactam and pyrrolidone, secondary or tertiary monoalcohols, oximes such as methylethylketoxime, and ketoalcohols such as acetylacetone.

The amino resin and the isocyanate resin used in the present invention are both resin compositions (A) when the paint is baked.
It is a curing agent component that cross-links with the hydroxyl groups in it to form a coating film.

In the present invention, the solid content weight ratio of the resin composition (A) and the amino resin in the coating composition is preferably 5 to 50 parts by weight with respect to 100 parts by weight of the former. If this ratio is less than 5 parts by weight, the cross-linking density of the cured coating film is not sufficient, so that the physical properties of the coating film such as chemical resistance, solvent resistance and water resistance are not sufficient. On the other hand, if the amount exceeds 50 parts by weight, the cured coating film becomes extremely hard and is not practicable due to poor flexibility and bending property.

Further, the compounding ratio of the resin composition (A) and the isocyanate resin in the coating composition is such that the hydroxyl groups contained in the resin composition (A) and the isocyanate groups masked by the blocking agent in the isocyanate resin are equivalent ratios. The latter is preferably 0.5 to 2.0 equivalents with respect to the former 1 equivalent. If the isocyanate group is less than 0.5 equivalent in this equivalent ratio, the cross-linking density of the cured coating film is not sufficient, so chemical resistance, solvent resistance, various physical properties of the coating film such as water resistance are not sufficient, and if it exceeds 2.0 equivalents. The cured coating film becomes extremely hard and is not practically usable due to poor flexibility, bending property and the like.

The solvent-based coating solution composition of the present invention provides a uniform resin solution by additionally adding an acrylic resin and / or a polyester resin in addition to the resin composition (A) and a curing agent which is an amino resin and / or an isocyanate resin. Can get
These additional uses are also possible. It is considered that this is because the resin composition (A) partially improved the compatibility with both resins due to the mutual reaction of both resins.

In addition, as various materials generally used for paints, coloring pigments such as titanium oxide, carbon black, red iron oxide, and extender pigments such as clay, calcium carbonate, barium sulfate, talc, alumina, silica, and silica powder. Can be blended and used.

In addition, fibrin derivatives, petroleum resins, phenolic resins, ketone resins, synthetic rubbers, unsaturated polyester resins, natural resins such as rosin, synthetic resins, leveling agents, anti-sagging agents, defoaming agents, surfactants, and curing accelerators. Various auxiliaries such as agents can also be used.

The coating composition of the present invention can be prepared by a method known per se. For example, the above-mentioned components are mixed with an organic solvent in a mixing dispersion such as a steel mill, a pepper mill, an attritor, a sand mill, and a high-speed stirrer with blades. It can be adjusted by placing it in a machine and uniformly mixing and dispersing. Examples of the organic solvent used at that time include hydrocarbons such as xylene and solvent naphtha, alcohols such as methyl alcohol, n-butyl alcohol and isobutyl alcohol, methyl isobutyl ketone, ketones such as cyclohexanone, ethyl acetate and butyl acetate. , Ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, diethylene glycol monobutyl ether, and other esters and ethers used in ordinary coating compositions can be exemplified.

The amount of the total solvent can be selected in an appropriate range depending on the coating method used, and is generally 1 to 90% by weight in the total coating composition.

The coating composition of the present invention can be coated on metals, plastics, wood products and the like by a conventional coating method such as spray coating, brush coating or roll coating. Examples of the method for curing the coating film include heating at 100 ° C. to 250 ° C. for 1 minute to 60 minutes.

(Examples) Next, the present invention will be specifically described with reference to Reference Examples, Examples and Comparative Examples, but all parts and% are based on weight.

Reference Example 1 (Example of adjusting polyester resin) A raw material shown in Table 1 was charged into a four-necked flask equipped with a stirrer, a thermometer, a condenser with a stack din, and a nitrogen introducing tube, and the temperature was about 220 ° C in a nitrogen stream at about 220 ° C. The reaction product is reacted for 10 hours while distilling off the reaction product, and the polyester resin A-
1 to A-5 were obtained. Reference Example 2 (Preparation example of acrylic resin) 100 parts of xylene was charged into a four-necked flask equipped with a stirrer, a thermometer, and a condenser, and heated to 100 ° C. The raw materials shown in Table 2 were dropped therein for 4 hours and then kept at the same temperature for 6 hours to obtain acrylic resins B-1 to B-5 having a solid content of 50%.

Reference Example 3 (Preparation Example of Resin Composition (A)) The polyester resin and acrylic resin shown in Table 3 were placed in a four-necked flask equipped with a stirrer, a thermometer, and a condenser with a stack din, and heated and heated. While distilling off xylene and reaction products, the temperature was raised to 220 ° C., the reaction was carried out at the same temperature for 1 hour, and after cooling, the solvents shown in Table 3 were added, and resin solutions C-1 to C- having a solid content of 50% were added. 9 and C-11 and C-12 were obtained.

C-10 was obtained in the same manner except that the reaction was carried out at 240 ° C. for 30 minutes. Further, C-13 to C-15 were obtained in the same manner except that the reaction was conducted at 180 ° C. for 3 hours.

Example 1 C-1 of the resin composition (A) shown in Table-3 and the pigments shown in Table-4 were dispersed in a ball mill for 1 hour, and then a curing agent, a leveling agent and a curing catalyst were added with stirring. Got the paint. This was applied to a zinc chromate steel plate with a bar coater and heated to 220 ° C. for 2 minutes to obtain a test plate. The coating performance is shown in Table-4.

Examples 2 and 3 and Comparative Examples 1 and 2 In the same manner as in Example 1, the coating materials were adjusted at the ratios shown in Table-4,
A test plate was obtained by the same method. The coating performance is shown in Table-4.

Reference Example 4 (Preparation of clear paint) In a four-necked flask equipped with a stirrer, a thermometer, and a condenser, 85 parts of Solvesso 100 (trade name, manufactured by Esso) and n-
15 parts of butanol were charged and the temperature was raised to 120 ° C. A raw material consisting of 20 parts of styrene, 57 parts of n-butyl methacrylate, 20 parts of hydroxymethacrylate, 3 parts of methacrylic acid, and 3 parts of azobisisobutyronitrile was added dropwise over 4 hours, and then at the same temperature for 6 hours. By holding for a time, an acrylic resin having a solid content of 50% was obtained. This acrylic resin 140
Part, U-Van 20SE-60 (Butylated melamine resin Mitsui Toatsu Chemical Co., Ltd., solid content 60%) 50 parts, Resmix RL-4
1 part was mixed with a stirrer, diluted with Solvesso 150 (trade name, manufactured by Esso Co.), and the viscosity was adjusted to 30 seconds / 25 ° C. with Ford cup # 4 to obtain a clear paint.

Example 4 The resin composition (A) C-6 shown in Table 3 and the pigment shown in Table 5 were dispersed in a sand mill for 5 hours, after which a curing agent was added and 70 parts of xylene, 20 parts of ethyl acetate, and 10 parts of cellosolve acetate. For 15 seconds with Ford cup # 4
The viscosity was adjusted to 25 ° C to obtain a paint. This was coated on an object to be coated (Bondellite # 144 zinc phosphate-treated steel sheet) by air spray, and heated at 140 ° C. for 20 minutes to obtain a test plate.

 The coating film performance is shown in Table-5.

Example 5 The resin composition (A) C-7 shown in Table-3, the pigment shown in Table-5 and the curing agent were mixed with a stirrer, and thereafter a coating material was obtained in the same manner as in Example 4. After coating this with air spray, after setting for 3 minutes, apply the clear paint of Reference Example 4
Wet on wet paint, set for 10 minutes, then at 140 ℃ for 20 minutes
After heating for a minute, a test plate was obtained.

 The coating film performance is shown in Table-5.

Example 6 A coating material was prepared in the same proportion as shown in Table 5 in the same manner as in Example 4,
The obtained paint is applied to an object by air spray, and after setting for 3 minutes, the clear paint of Reference Example 4 is wet on w
Et coating, setting for 10 minutes, and heating at 140 ° C for 20 minutes to obtain a test plate.

 The coating film performance is shown in Table-5.

Examples 7 and 8 and Comparative Examples 3 and 4 In the same manner as in Example 4, the coating materials were adjusted at the ratios shown in Table-5,
A test plate was obtained by the same method.

 The coating film performance is shown in Table-5.

Examples 9 to 11 and Comparative Examples 5 and 6 In the same manner as in Example 4, the coating materials were adjusted at the ratios shown in Table-6,
A cationic electrodeposition paint was applied to a steel sheet for automobile bodies by air spray, and it was applied to a baked object. 1 at 150 ℃
A test plate was obtained by heating and drying for 0 minutes.

 The coating film performance is shown in Table-6.

1) Amino resin: methylated melamine Cymel 303 (manufactured by Mitsui Cyanamid Co., Ltd.) solid content 100% 2) Isocyanate resin: aliphatic block isocyanate Orestar 106OPB (manufactured by Mitsui Toatsu Chemical Co., Inc.) isocyanate content 9% Solid content 60% 3) Curing catalyst: aromatic sulfonic acid Catalyst 6000
(Mitsui Toatsu Chemical Co., Ltd.) 4) Titanium oxide: R-930 (Ishihara Sangyo Co., Ltd.) 5) Leveling agent: acrylic resin Resmix RL-
4 (manufactured by Mitsui Toatsu Chemicals, Inc.) 6) Appearance of coating film: The finish of the coating film was visually observed, and a smooth and uniform coating film was evaluated as ⊚, and poor uniformity was evaluated as x.

7) Workability: After OT Bend (bending 360 degrees with the coated surface outside), tape is peeled off, ◎ if the coating film does not peel off, ○ for slightly peeling, × for peeling evaluated.

8) Contamination resistance: A line was drawn with a magic ink, and after 24 hours, depending on the degree of contamination after extraction with methanol, ⊚ was evaluated for those that did not remain at all, ∘ for those that remained a little, and x for those that remained almost.

9) Red pigment: Quinacridone 500-RG (manufactured by Toyo Soda Co., Ltd.) 10) Aluminum pigment: Aluminum paste 7160N (manufactured by Toyo Aluminum Co., Ltd.) 11) Acid resistance: 10% H ₂ SO ₄ is dropped on the coating film at 20 ° C. After leaving it for 24 hours, it was wiped and observed. Those with no trace were evaluated as ⊚, and those with a trace were evaluated as x.

12) Alkali resistance: 0.1N NaOH is dropped on the coating film, and it is kept at 20 ℃ for 2 hours.
After leaving it for 4 hours, it was wiped and observed. Those with no trace were evaluated as ⊚, and those with a trace were evaluated as x. 13) Weather resistance: The gloss retention rate after 2000 hours of testing with a sunshine weather meter was displayed.

14) Kaolin: manufactured by Tsuchiya Kaolin Co., Ltd. 15) Adhesion: Vertically and horizontally 2 cuts with 10 cuts each with a knife until they reach the metal surface, attach cellophane tape to the cuts, and then peel to see if there is peeling. I checked.
Those without peeling were evaluated as ⊚, and those with peeling were evaluated as ×.

16) Water resistance: The coating film was immersed in 60 ° C warm water for 10 days, and abnormalities such as blister were observed. No change was evaluated as ⊚, and abnormal one was evaluated as x.

17) Chipping resistance: Average particle size of 3mm with gravure tester
2 kg of silica sand was applied to the coating film with an air pressure of 3 kg / cm ² , and it was checked whether the scratches in the coating film reached the metal surface. The case where the metal surface was not exposed was evaluated as ⊚, the case where the metal surface was not exposed was evaluated as ○, and the case where the metal surface was exposed was evaluated as ×.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI Technical display area C09D 175/00 PHM C09D 175/00 PHM

Claims (1)

(57) [Claims] 1. A polyester resin having a hydroxyl value of 5 to 200 KOHmg / g 5 to 95 parts by weight and an acrylic resin having a hydroxyl value of 5 to 200 KOHmg / g of 95 to 5 parts by weight at a temperature of 180 to 280 ° C. for 10 minutes or more. A solvent-based coating material comprising a resin composition (A) which is subjected to a transesterification reaction with each other for 5 hours and becomes a uniform solution when dissolved in a solvent, and a curing agent (B) which is an amino resin and / or an isocyanate resin. Resin composition.