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WO2025128403A1 - Composé de joint basé sur une charge de gypse à faible coefficient de frottement - Google Patents

Composé de joint basé sur une charge de gypse à faible coefficient de frottement Download PDF

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Publication number
WO2025128403A1
WO2025128403A1 PCT/US2024/058671 US2024058671W WO2025128403A1 WO 2025128403 A1 WO2025128403 A1 WO 2025128403A1 US 2024058671 W US2024058671 W US 2024058671W WO 2025128403 A1 WO2025128403 A1 WO 2025128403A1
Authority
WO
WIPO (PCT)
Prior art keywords
joint compound
drying
type joint
gypsum
gypsum powder
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
PCT/US2024/058671
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English (en)
Inventor
David Daniel PELOT
Tyler Jared KINCAID
Phanindra Kodali
Scott Daryl Cimaglio
Naveen Kumar PUNATI
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
United States Gypsum Co
Original Assignee
United States Gypsum Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US18/804,284 external-priority patent/US20250198167A1/en
Application filed by United States Gypsum Co filed Critical United States Gypsum Co
Publication of WO2025128403A1 publication Critical patent/WO2025128403A1/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
    • C04B26/02—Macromolecular compounds
    • C04B26/04—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds

Definitions

  • This disclosure relates to the field of building construction compositions and methods, including drying-type joint compounds having a lowered friction coefficient.
  • Gypsum panels including drywall panels are commonly used in construction of interior walls and ceilings.
  • gypsum panels may be affixed to a frame with fasteners.
  • Various joint compounds are then used in order to finish seams (joints) between adjacent gypsum panels.
  • Joint compounds include setting-type joint compounds which comprise calcined gypsum as a main filler and drying-type joint compounds which may comprise calcium carbonate as a main filler.
  • a joint compound is mixed with water to form a paste which is then spread over a drywall surface and joints. After the applied joint compound dries, it may need to be sanded.
  • Various attempts have been made to improve sandability of a joint compound. For example, US patent 10,928,286 discloses a system and method for determining a sandability value of a joint compound.
  • US patent 7,048,791 discloses a low dust wall repair compound which comprises one or more of airborne dust reducing additives including oils, surfactants, solvents, waxes, and other petroleum derivatives.
  • US patents 10,800,706 and 10,988,416 disclose vesicle dedusting agents for joint compounds and methods.
  • the gypsum powder may be produced in a method which comprises removing fine particles, including those that are smaller than 5 pm from the gypsum powder.
  • the gypsum powder may have the D50 value in the range from about 20 pm to about 80 pm.
  • the additive may include a polymeric additive selected from one or more of the following: a surfactant, redispersible powdered latex, dispersing agent, humectant, defoaming agent, a plasticizer, polyethylene oxide, a phospholipid, or any combination thereof.
  • the gypsum powder may be supplied as fractionated gypsum powder from which fine particles have been removed such that the gypsum powder does not comprise or comprises only less than 10% of fine particles which are smaller than 5 pm.
  • the friction coefficient has been lowered by at least 5%.
  • the drying-type joint compound composition may comprise on a dry basis: about 50 wt% to about 95 wt% of the gypsum powder; about 0.5 wt% to about 15 wt% of the binder; about 1 wt% to about 10 wt% of the one or more clays; about 0.05 wt% to about 3 wt% of the cellulosic thickener; and about 0.1 wt% to about 1 wt% of the additive comprising one or more of the following: a biocide, a pigment, a fungicide, a dispersing agent, a humectant, a defoaming agent, a plasticizer, a dedusting agent, or any combination thereof.
  • the drying -type joint compound composition may further comprise one or more of the following light-weight fillers: perlite, expanded perlite, coated expanded perlite, mica, hollow glass microspheres, talc, polyethylene hollow microspheres, ceramic microspheres, solid glass microspheres, plastic microspheres, or any mixture thereof.
  • one or more of the light-weight fillers may be used in an amount from about 0.5 wt% to about 25 wt% on a dry basis of the drying -type joint compound.
  • the drying -type joint compound composition may further comprise one or more of the following dedusting agents: a wax, oil, polyethylene glycol, glycerol, siloxane, or any combination thereof; and/or one or more of ASE and/or HASE rheological modifiers.
  • dedusting agents a wax, oil, polyethylene glycol, glycerol, siloxane, or any combination thereof; and/or one or more of ASE and/or HASE rheological modifiers.
  • the drying-type joint compound embodiments include those, wherein the binder is a latex binder with a high glass transition temperature (T g ).
  • this disclosure relates to a ready-mixed drying -type joint compound which comprises the drying-type joint compound composition according to this disclosure and water.
  • this disclosure relates to a method for optimizing a friction coefficient of a drying -type joint compound, the method comprising: grinding gypsum mineral fragments into gypsum powder with the median particle size distribution D50 of at least about 20 pm.
  • the method may further comprise separating particles according to their sizes in a turbine, with a whizzer air separator, a cyclone, an elbow jet air classifier and/or passing the gypsum powder through a fine U.S. standard mesh and collecting a gypsum fraction retained on the sieve.
  • this disclosure relates to a method for treating a seam between adjacent wallboard panels and/or for treating a wallboard panel surface, the method comprising: i. filling the seam with a drying-type joint compound and/or applying the drying-type joint compound over the wallboard panel surface, the drying-type joint compound comprising: a) gypsum powder having the median particle size (D50) of at least about 20 pm; b) a binder; c) one or more clays; d) a cellulosic thickener; e) an additive; and f) water; and ii. after the applied joint compound dries, sanding the dried joint compound.
  • a drying-type joint compound comprising: a) gypsum powder having the median particle size (D50) of at least about 20 pm; b) a binder; c) one or more clays; d) a cellulosic thickener; e) an additive; and f) water; and ii. after the
  • Fig. 1 is a schematic side view of one embodiment of a system for measuring a friction coefficient for a joint compound according to this disclosure.
  • Fig. 2 is a chart reporting results of a comparative analysis comparing a friction coefficient in drying -type joint compounds comprising gypsum powder according to this disclosure in comparison to formulations comprising gypsum, calcium carbonate, or synthetic gypsum.
  • Fig. 3 is a chart reporting results of a comparative analysis comparing a friction coefficient in drying -type joint compounds comprising gypsum powder according to this disclosure in comparison to formulations which comprise various additives, such as dedusting agents and/or different binders.
  • wt% means percentage by weight. In this disclosure, all percentages and ratios are by weight, unless specifically stated otherwise.
  • “about” means a value plus/minus 10%.
  • “about 100” means 100 ⁇ 10 and “about 200” means 200 ⁇ 20.
  • composition may be used interchangeably with the term “mixture” or “formulation.”
  • compositions include dry powder formulations which do not comprise water or liquid components as well as compositions in liquid, slurry or paste form which comprise water and/or liquid components.
  • a dry joint compound composition means that the composition does not contain aqueous water or liquid components.
  • the composition may be in powder form.
  • a dry composition or dry mixture may have some moisture content and may contain compounds with bound water molecules.
  • dry component means a component which does not comprise aqueous water or liquid additives. The dry component may have some moisture content and may contain bound water molecules.
  • gypsum may refer to any of the following: naturally mined gypsum (ore), landplaster and/or synthetic gypsum. Gypsum may also include gypsum which originate from a waste stream, as a bi-product, or a recycled material, such as dry wall.
  • the term “gypsum” may be used interchangeably with the term “calcium sulfate dihydrate” or CaSO 4 -2H 2 O.
  • synthetic gypsum can be also referred to as “chemical gypsum,” or flue gas desulfurization (FGD) gypsum.
  • calcined gypsum may be used interchangeably with calcium sulfate hemihydrate, stucco, calcium sulfate semi-hydrate, calcium sulfate half-hydrate, plaster of Paris, or CaSO 4 - I/2H2O.
  • the term “limestone” may be used interchangeably with calcium carbonate or CaCOs.
  • the median particle size of gypsum powder may be abbreviated as “D50 ”
  • the median particle size of gypsum, D50 may be measured by a laser diffraction (scattering) method, preferably using isopropyl alcohol as dispersant.
  • D50 is the median diameter particle size with 50% of counted particles having larger diameters (sizes) and 50% of counted particles having smaller diameters (sizes). In this disclosure, measurements were performed on Horiba LA950V2 dynamic light scattering analyzer from HORIBA, Ltd.
  • DIO is defined as a particle size on a particle size distribution curve below which 10% of particles have a smaller particle size and above which 90% of particles have a larger size.
  • D90 is defined as a particle size on the particle size distribution curve below which ninety percent of particles have a smaller particle size and above which ten percent of particles have a larger particle size.
  • composition is substantially free of fine particles
  • the composition comprises less than about 5%, less than about 2%, or less than about 1% of fine particles, e.g., between about 0.01% to about 5% of fine particles having a size of about 5 pm, or smaller.
  • Natural gypsum for construction is traditionally processed in a method which includes excavating gypsum mineral from the earth crust, crushing the gypsum mineral into gypsum fragments, preferably to a size of 20-30 mm, and then grinding the gypsum fragments until gypsum powder with the median size distribution (D50) of about 15 pm is obtained, which is a preferred size of ground gypsum for construction formulations because the finer the grinding, the larger is the reaction surface of ground gypsum and the faster is the setting reaction of calcined gypsum. It was reported in U.S.
  • Patent 3,723, 146 that having calcined gypsum that is substantially free of plus 32 micron particles improves significantly resistance to aging and produces a faster setting reaction.
  • one of technical disadvantages of dry-type joint compounds which comprise gypsum is that these joint compounds are difficult to sand.
  • a drying-type joint compound with a technically acceptable friction coefficient of about 1.25 or lower, preferably of about 1.20 or lower, and most preferably of about 1.15 or lower can be obtained by controlling particle size distribution in gypsum during grinding and/or by subsequent fractionation of the gypsum powder according to particle sizes such that a gypsum powder is produced which has a D50 value of about at least 20 pm or greater, e.g. at least equal or greater than 24, 31, 62, or 78 pm.
  • the gypsum powder preferably also has a D10 value greater than about 5 pm.
  • this disclosure relates to a drying-type joint compound composition containing gypsum powder with a particle size distribution optimized for lowering a friction coefficient of a drying -type joint compound.
  • the gypsum powder has D50 of about 20 pm or greater, e.g., of at least about 21 pm or greater, at least about 22 pm or greater, at least about 24 pm or greater, for example in the range from about 20 pm to about 80 pm, or in the range from about 21 pm to about 75 pm.
  • the gypsum powder also has a D10 greater than 5 pm, e.g., equal or greater than 6 gm, 7 gm, 8 gm, 9 gm, 10 gm or 11 gm.
  • the gypsum powder is substantially free of fine particles with a particle size ranging from about 0.1 pm to about 10 gm, or more preferably ranging from about 0.1 gm to about 5 gm.
  • the gypsum powder may also have a D90 equal or less than about 130 gm, e.g., equal or less than about 96 gm, 90 gm, 89 gm, 88 gm, 87 gm, 86 gm, or 85 gm.
  • a D90 equal or less than about 130 gm, e.g., equal or less than about 96 gm, 90 gm, 89 gm, 88 gm, 87 gm, 86 gm, or 85 gm.
  • Embodiments of the gypsum powders according to this disclosure are listed in Fig. 2, including the powders in series 2, having the coefficient of friction 1.23, 1.22, 1.17 or 1.07.
  • gypsum is not suitable even in small amounts as a filler for a drying-type joint compound in part because such drying -type joint compounds are more difficult to sand.
  • a drying-type joint compound with a lowered friction coefficient can be prepared with a gypsum powder which has been produced such that production of fine particles is avoided during crushing/grinding and/or the ground gypsum powder has been fractionated according to particle sizes such that fine particles, including those in the range from about 0.1 pm to about 5 gm, have been removed from the gypsum powder.
  • a person of skill may use a grinding machine.
  • grinding machines include, but are not limited to, a ball mill, impact mill and/or a roller mill.
  • a tumbling mill grinding machine, or a ball mill can be used.
  • One or more of the following parameters may be adjusted in order to produce the gypsum powder having the D50 value of 20 pm or greater: ball size distribution, mill speed, grinding aid ratio, ball filling ratio and grinding time.
  • a particle size fractionation can be conducted in a turbine or with a whizzer air separator which separate fine particles from the rest of gypsum powder.
  • Suitable gypsum particle fractionation techniques which can be used include, but are not limited, to inertia based, centrifugal, and/or residence time based techniques, such as turbines, whizzer air separators, cyclones which can control and remove a particulate matter from the gypsum powder according to particle size, elbow jet air classifiers which can classify gypsum particles into several products simultaneously based on the particle size.
  • a step of fractionation according to particle size may be also performed.
  • the fractionation aiming at separation and removal of fine particles may be performed in a turbine, with a whizzer air separator, a cyclone, or an elbow jet air classifier.
  • the size fractionation step may also include passing gypsum powder through a sieve such that only fine particles are passed through the sieve openings and these fine particles are thereby separated and removed from a gypsum powder fraction retained on the sieve.
  • a person of skill may use a particle size analyzer such as a dynamic light scattering analyzer such as for example as Horiba LA950V2 dynamic light scattering analyzer (Horiba, Japan) and isopropyl alcohol as dispersant.
  • a particle size analyzer such as a dynamic light scattering analyzer such as for example as Horiba LA950V2 dynamic light scattering analyzer (Horiba, Japan) and isopropyl alcohol as dispersant.
  • the gypsum powder may be fractionated by using a U.S. standard Sieve 625 Mesh (20pm openings), 450 Mesh (32pm openings), wherein gypsum to be fractioned is passed through a U.S. 625 Mesh or 450 Mesh and the gypsum powder which is retained on the mesh is collected and is the gypsum powder according to this disclosure.
  • U.S. standard Mesh Size is defined as the number of openings in one square inch of a screen.
  • U.S. 625 Mesh has 625 openings per one square inch
  • U.S. 450 Mesh has 450 openings per one square inch
  • U.S. 325 Mesh has 325 openings in one square inch.
  • the gypsum powder according to this disclosure may be noted with a minus (-) or plus (+) sign. If the minus (-) sign is used, it denotes that particles in the gypsum powder are smaller than the mesh size. If the plus (+) sign is used, it denotes that most of particles in the gypsum powder are larger than the mesh size.
  • a friction coefficient (g) is defined as the ratio of the friction force (F) resisting a motion in direction from A to B of a sanding surface (12) in contact with a dried joint compound to be sanded (14), the dried joint compound (14) being applied over a surface (16), to the normal force (N) pressing the two surfaces (12 and 14) together, the normal force (N) being applied by a weight (18) pressing over the two surfaces (12 and 14) together.
  • the friction coefficient (g) is defined by formula (I):
  • a sanding surface (12) such as for example as sanding paper, preferably 150 grit sandpaper and most preferably 10X9 cm size 150 grit sandpaper is then placed over the dried joint compound (14) by aligning one an edge (14A/16A) of the dried compound to be sanded (14) with an edge (12A) of the sanding surface (12).
  • One suitable system for measuring the friction coefficient (p) includes a system and method for evaluating a joint compound specimen disclosed in U.S. patent 10,928,286, the entire disclosure of which is herein incorporated by reference.
  • Fig. 2 it reports friction coefficients for drying type joint compounds prepared with a filler comprising gypsum having D50 of about 15 p versus drying type joint compounds prepared with the gypsum powder according to this disclosure and having a D50 value of about 20 p or greater.
  • samples in series 1 were prepared with calcium carbonate as a filler.
  • using gypsum having a D50 value of about 15 pm increases a friction coefficient unfavorably in comparison to a drying-type joint compound comprising calcium carbonate, from 1.16 to 1.32.
  • the gypsum powder according to this disclosure having a D50 value of at least 24 pm or greater produces a drying-type joint compound with a friction coefficient which is lower than that of a joint compound formulated with gypsum having D50 of 15pm (series 2).
  • a joint compound prepared with the gypsum powder according to this disclosure has an acceptable friction coefficient which is comparable or even lower than a friction coefficient of a joint compound prepared with calcium carbonate.
  • the friction coefficient of a joint compound formulated with the gypsum powder according to this disclosure has been lowered by at least about 5%, about 10% and more preferably by at least 15% and most preferably by at least 20% in comparison to a joint compound prepared with gypsum having the median particle size (D50) of about 15 pm.
  • the drying -type joint compounds according to this disclosure may comprise from about 50 wt% to about 95 wt%, more preferably 55 wt% to 85 wt%, or 60 wt% to 75 wt% on a dry basis of the gypsum powder according to this disclosure.
  • the gypsum powder can be used as a main filler and in large amounts because the friction coefficient has been optimized and is comparable or even lower than a friction coefficient of a drying-type joint compound which comprises calcium carbonate.
  • a drying -type joint compound may be prepared without calcium carbonate (limestone).
  • a drying -type joint compound may include calcium carbonate.
  • a drying -type joint compound may be prepared with a combination of the gypsum powder and calcium carbonate.
  • the drying-type joint compound may comprise a mixture of the gypsum powder together with calcium carbonate in an amount ranging from 50 wt% to about 95 wt%, more preferably 55 wt% to 85 wt%, or 60 wt% to 80 wt% on a dry basis of the dry-type joint compound composition.
  • Calcium carbonate to the gypsum powder may be used in a ratio ranging from 1: 10 to 10: 1 by weight.
  • drying-type joint compounds according to this disclosure do not comprise calcined gypsum.
  • some formulations of the dry -type joint compounds according to this disclosure may further comprise a second filler which may be preferably a light-weight filler comprising one or more of the following: perlite, expanded perlite, coated expanded perlite, mica, hollow glass microspheres, talc, polyethylene hollow microspheres, ceramic microspheres, solid glass microspheres, plastic microspheres, or any mixture thereof.
  • the light-weight fillers may be used in any suitable amounts, depending on the filler type.
  • from about 0.1 wt% to about 25 wt%, more preferably from about 0.5 wt% to about 20 wt% and most preferably from about 1 wt% to about 15 wt% of the light-weight filler on a dry basis may be used in at least some embodiments.
  • perlite which can be used as expanded perlite.
  • Perlite may be coated or uncoated. Suitable coatings include silane or siloxane coatings, including as described in US patents 4,454,267 and 4,525,388.
  • the drying -type joint compounds according to this disclosure may comprise at least one binder.
  • Suitable binders include natural starches produced from plants, synthetic starches, polymeric binders, or any combination hereof.
  • Non-limiting examples of starches are com, wheat, and potato starch.
  • Starches include those that have been chemically modified and/or pregelatinized.
  • Suitable polymer binders include, but are not limited to, polyvinyl acetate, polyvinyl alcohol, acrylic emulsions, vinyl or styrene acrylic copolymers, ethylene vinyl acetate co-polymer, polyacrylamide, or any combination thereof.
  • one or more binders may be included in an amount ranging from about 0.5 wt% to about 15 wt%, preferably from about 4 wt% to about 10 wt%, on a dry basis of the joint compound composition.
  • a latex emulsion such as for example as ethylene vinyl acetate or polyvinyl acetate emulsion, may be used either alone or in combination with other polymer binders. In some embodiments, from about 1 wt% to about 10 wt%, or from about 1 wt% to about 5 wt% of a latex emulsion on a dry basis of the joint compound may be used.
  • latex binders with a low glass transition temperature (low T g ) and/or a high glass transition temperature (high T g ) are suitable for drying-type joint compound compositions.
  • using a latex binder with a high glass transition temperature may lower a friction coefficient further in the compositions according to this disclosure in comparison to the same compositions, but in which a latex binder with a low glass transition temperature has been used.
  • latex binders with high T g include those having a T g in the range from about 30 to about 60°C.
  • latex binders with low T g include those having a T g in the range from about 10 to about 25°C.
  • the drying-type joint compounds according to this disclosure may comprise at least one non-leveling agent, which may be attapulgite clay, bentonite, a starch, e.g., com starch, or any combination thereof.
  • the drying -type joint compounds according to this disclosure comprise attapulgite clay and more preferably attapulgite clay in combination with kaolin clay.
  • the non-leveling agents may be used in small amounts, for example in any amount ranging from about 0.5 wt% to about 10 wt%, or more preferably from about 1 wt% to about 5 wt% on a dry basis of the joint compound composition.
  • Attapulgite clay may be used in an amount from about 0.5 wt% to about 5.0 wt% and more preferably from about 1 wt% to about 3 wt%. In some embodiments, attapulgite clay may be used in combination with kaolin clay which may be used in small amounts of about 3 wt% or less, preferably from about 0.5 wt% to about 2 wt%, on a dry basis of the joint compound composition.
  • Drying-type joint compounds according to this disclosure may comprise one or more of cellulosic thickeners.
  • suitable cellulosic thickeners include, but are not limited to, cellulose ethers in which the secondary hydroxyls of cellulose are replaced by ether groups, such for example as hydroxyethyl cellulose, hydroxypropyl methylcellulose, ethylcellulose, carboxymethyl cellulose, ethyl methylcellulose, among many others; as well as various cellulose-based gums, e.g., carrageenan, guar gum, and/or xanthan gum.
  • the cellulosic thickener may be present in any amount ranging from about 0.05 wt% to about 3 wt%, preferably from about 0.1 wt% to about 2 wt% on a dry basis of the joint compound composition. In some embodiments, one or more cellulosic thickeners may be used in amount ranging from about 0.1 to about 0.5 wt% and more preferably from about 0.1 to about 0.4 wt% on a dry basis of the joint compound composition.
  • the drying -type joint compound compositions according to this disclosure may further comprise one or more low molecular weight polymeric rheology modifiers, including one or more of alkali-swellable (ASE) acrylic polymers and/or hydrophobically modified alkali swellable (HASE) acrylic co-polymers.
  • the ASE polymeric rheology modifiers include co-polymers of methacrylic acid and acrylic ester in which thickening may be triggered by a change from low to high pH.
  • the HASE polymeric rheology modifiers include co-polymers of acrylic acid and one or more of second associative monomers which may contain a hydrophilic chain segment linked with a terminal hydrophobic group.
  • the ASE and/or HASE rheological modifiers may be used in small amounts, preferably from about 0.01 wt% to about 10 wt%, about 0.1 wt% to about 5.0 wt%, or about 0.1 wt% to about 1 wt% on a dry basis of the joint compound composition. In some embodiments, the ASE and/or HASE rheological modifiers may be used in an amount ranging from about 0.1 wt% to about 3 wt% and more preferably from about 0.5 wt% to about 2 wt% on a dry basis of the joint compound composition.
  • the drying -type joint compounds according to this disclosure may further comprise one or more of other additives, including, but not limited to, a biocide, a pigment, a fungicide, a dispersing agent, a humectant, a defoaming agent, a plasticizer, a dedusting agent, or any combination thereof.
  • Some of the additives may be a polymeric additive selected from one or more of the following: a surfactant, redispersible powdered latex, dispersing agent, humectant, defoaming agent, a plasticizer, polyethylene oxide, a phospholipid, or any combination thereof. If present, any of these additives may be used in a small amount, such as for example as from about 0.1 wt% to about 2 wt% on a dry basis of the joint compound composition.
  • the drying -type joint compounds according to this disclosure may be prepared as a dry powder composition which is then mixed with water prior to use.
  • Water can be added in any amount suitable to produce a paste-like consistency.
  • water may be used in a weight ratio of water to dry components of the joint compound in the range from about 1:6 to about 1: 1, respectively.
  • the joint compounds according to this disclosure may be used in any of the following applications among others: 1) repairing minor damages on a wallboard surface, e.g., holes, dents, and scares; and 2) preparing a wallboard surface wherein the joint compound can be applied over the surface as a skim coating.
  • the joint compounds can be also used to finish wallboard panel joints and/or to mask comer beads, joint tape and fasteners.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Sealing Material Composition (AREA)

Abstract

L'invention concerne un composé de joint de type à séchage et des procédés associés, le composé de joint de type à séchage ayant un coefficient de frottement abaissé et formulé avec de la poudre de gypse ayant la taille de particule médiane (D50) d'au moins environ 20 pm, de préférence la poudre de gypse a un DIO supérieur à 5 pm, le composé de joint de type à séchage comprenant en outre un liant ; une ou plusieurs argiles ; un épaississant cellulosique ; et un additif.
PCT/US2024/058671 2023-12-13 2024-12-05 Composé de joint basé sur une charge de gypse à faible coefficient de frottement Pending WO2025128403A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US202363609437P 2023-12-13 2023-12-13
US63/609,437 2023-12-13
US18/804,284 US20250198167A1 (en) 2023-12-13 2024-08-14 Gypsum filler based joint compound with low coefficient of friction
US18/804,284 2024-08-14

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WO2025128403A1 true WO2025128403A1 (fr) 2025-06-19

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Citations (14)

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US4454267A (en) 1982-12-20 1984-06-12 United States Gypsum Company Lightweight joint compound
US4525388A (en) 1983-12-23 1985-06-25 Usg Corporation Process for expanding and coating perlite
CA2563773A1 (fr) * 2004-04-27 2005-11-10 Hercules Incorporated Composes de joint utilisant des epaissisants prepares a partir linters de coton brut
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