Abstract: A plaster composition includes a joint compound/drywall mud and from about 0.5 wt % to about 10 wt % silica (e.g., hydrophilic fumed silica). The plaster composition may be a repair composition. The repair composition may be dispensed as an aerosol using a propellant. The repair composition may be useful for repairing “popcorn” textured ceilings.

Abstract: There is provided a gypsum composition for a drying type coating material, the gypsum composition, when made into a gypsum-based coating material by addition of water, capable of forming a coating film in which color unevenness is suppressed even though the coating film is thin and smooth. This gypsum composition for a drying type coating material contains hemihydrate gypsum having a mean particle diameter of 50 ?m or less, calcium carbonate having a mean particle diameter of 50 ?m or less, and a setting retarder, wherein the gypsum composition has a content of calcium carbonate of 100 to 400 parts by mass and a content of the setting retarder of 0.1 parts by mass or more each based on 100 parts by mass of the hemihydrate gypsum.

Abstract: A cementitious hydrating patch composition is provided with improved strength and abrasion resistance. The patch comprises Portland cement in the amount from 2% to 10%, Calcium Sulfate Hemihydrate in the amount from 2% to 30%, Gypsum in the amount from 0% to 15%, Calcium Aluminate Cement in the amount from 15% to 40%, Calcium Carbonate in the amount from 0% to 40%, at least one filler in the amount from 1% to 30%; and at least one binder in the amount from 10% to 40%, wherein all amounts are based on dry weight of the composition. Methods of preparing and using the patch composition are provided as well.

Abstract: A method for producing a polysilicon resistor device may include: forming a polysilicon layer; implanting first dopant atoms into at least a portion of the polysilicon layer, wherein the first dopant atoms include deep energy level donors; implanting second dopant atoms into said at least a portion of said polysilicon layer; and annealing said at least a portion of said polysilicon layer.

Abstract: A method for the production of hard plaster, a calcining plant, and a retrofit reactor for calcining plants. The method includes feeding plaster material, predominantly including beta-hemihydrate plaster, to a postreactor. The temperature is set to at least a calcining temperature of 95° C. during this step. The plaster material is retreated in the postreactor to form hard plaster, the beta-hemihydrate plaster being converted directly into alpha-hemihydrate plaster at a temperature above 95° C. The hard plaster can then be discharged out of the postreactor and cooled. Conversion can be carried out in the postreactor during continuous operation, and conversion of the beta-hemihydrate plaster can occur with a dwell time in the postreactor of less than 30 minutes. Steam can be externally supplied to the postreactor and the temperature and pressure in the postreactor can be regulated so that the temperature is at least 95° C. and an over pressure prevails.

Abstract: A slurry for manufacturing gypsum board is disclosed. The slurry comprises calcined gypsum, water, a foaming agent, and a thickening agent. The thickening agent of the present disclosure acts to improve the cohesiveness of the slurry without adversely affecting the setting time of the slurry, the paper-to-core bond (wet and dry), or the head of the slurry by acting as a defoaming agent or coalescing agent. Examples of suitable thickening agents include cellulose ether and co-polymers containing varying degrees of polyacrylamide and acrylic acid. A gypsum board and method of forming the slurry and the gypsum board are also disclosed. The gypsum board comprises a gypsum layer formed from the slurry.

Abstract: A composite product includes gypsum in an amount of 60 to 90% by weight, fibers in an amount of 1.5 to 26% by weight substantially homogeneously distributed through the composite, and a rheology-modifying agent in an amount of 0.5 to 6% by weight. The composite is caused or allowed to cure to form a cured composite. The cured composite is a fire resistant component used in a fire-rated door core, a fire-rated door or a fire-rated building panel. The fire resistant component may include a building panel, a door panel, a door core, a door rail, a door stile, a door lock block, a door border, or a door insert.

Abstract: A non-aqueous drywall compound being the combination of a first component mixture of acetone, a non-aqueous liquid adhesive containing ethyl cyanoacrylate, and a powder containing calcium sulfate hemihydrate (plaster of Paris), the mixture being a pliable putty capable of adhering to gypsum wallboard or similar work surfaces. The second component of the drywall compound is an accelerator or activator containing acetone and toluene. The first component is applied to a defect in a work surface using a spreading tool and the second component is then applied to the exposed surface of the first component, such as by spraying or brushing, whereupon the drywall compound cures, hardens or sets within less than ten minutes to a state capable of being sanded into a smooth, hard surface and painted.

Abstract: An aqueous gypsum plaster-cement composition comprises a hydraulic binder consisting of calcined gypsum and hydraulic cement in a weight ratio of from about 4:1 to about 2:1, an aggregate which comprises sand, a foam, a perlite, rice hulls or a mixture thereof, a superplasticizer comprising an air entraining agent, a retarder, and water in an amount of from about 0.4 to about 0.75 parts by weight per part of binder, with the proviso that the gypsum plaster-cement composition contains essentially neither a pozzolana nor lime. The use thereof, a method of constructing buildings using this composition and the buildings obtainable in this way are also described.

Abstract: The invention is directed to a construction material and to the use of modified layered inorganic material. The construction material of the invention comprises a layered inorganic material, which layered inorganic material comprises an ionic organic modifier compound and a biocide. The construction material of the invention has increased resistance against microbial fouling.

Abstract: The invention provides a set gypsum-containing product having increased resistance to permanent deformation and a method for preparing it comprising forming a mixture of a calcium sulfate material, water, and an appropriate amount of one or more enhancing materials chosen from condensed phosphoric acids, each of which comprises 2 or more phosphoric acid units; and salts or ions of condensed phosphates, each of which comprises 2 or more phosphate units. The mixture is then maintained under conditions sufficient for the calcium sulfate material to form a set gypsum material.

Abstract: Emulsions, and processes for making the emulsions, useful for imparting water resistance to gypsum products are disclosed. Process for making the emulsion and gypsum products made from the emulsion are also disclosed. The emulsions of the invention include at least one paraffin wax and a hydrophilic metallic salt. The emulsions of the invention may further include a saponifiable wax substitute for montan wax. The emulsions of the invention may further include a biocide.

Abstract: Surfactant-coated hemihydrate gypsum which is coated with 0.01 to 1 part by weight of a surfactant based on 100 parts by weight of hemihydrate gypsum, wherein the residual rate of the surfactant when the surfactant-coated hemihydrate gypsum is heated up to 300° C. is not less than 40 wt % of the amount of the surfactant before heating.

Abstract: Emulsions, and processes for making the emulsions, useful for imparting water resistance to gypsum products are disclosed. Process for making the emulsion and gypsum products made from the emulsion are also disclosed. The emulsions of the invention include at least one paraffin wax and a hydrophilic metallic salt. The emulsions of the invention may further include a saponifiable wax substitute for montan wax. The emulsions of the invention may further include a biocide.

Abstract: A pre-mixed mortar, stucco or masonry composition includes from 70 to 80 percent sand and from 20 to 30 percent of a light-weight cement mix composition. The light-weight cement mix composition comprises either slag cement, gypsum or a combination of slag cement and gypsum; Portland cement; silicon dioxide; calcium stearate; and metakaolin.

Abstract: The present invention provides a composition, a gypsum board and their preparation method and the use of ascorbic acid as an anti-sagging additive in a gypsum board. Said gypsum board comprises set gypsum prepared from the composition; while said composition comprises hemi-hydrate gypsum, water and a compound comprising group and no carboxylate groups. The set gypsum prepared from the said composition shows better anti-sagging or deformation resisting property. The gypsum board of the present invention is hardly distorted and has stronger stability even in the condition of high humidity, thus improve the quality of the gypsum board to meet the demands of the customer.

Abstract: Building materials include a dampening layer which contains a plaster and a viscoelastic polymer, such as polyvinyl butyral. The dampening layer may also include a barium salt. Methods of making a sound dampening material include providing a plaster mixture. The mixture may include a viscoelastic polymer and/or a barium salt. The plaster mixture is combined with water and/or a viscoelastic polymer dispersion, to form a slurry. The slurry is applied to a surface and set to form a sound dampening layer.

Abstract: Aqueous asphalt/wax emulsions are disclosed herein for use in gypsum formulations and other building products. The emulsions may include water; a wax component; an asphalt component; and at least one emulsifier. Optional additives may also be included in the emulsion or in a slurry formed from such emulsion for preparing a settable gypsum composition herein. Methods of making such emulsions are also provided.

Abstract: A gypsum slurry is provided that includes calcium sulfate hemihydrate; water; a dispersant component comprising at least one of the following a comb-branched polymer with polyether side chains, naphthalene sulfonate-formaldehyde condensate or melamine sulfonate-formaldehyde condensate; a foaming agent; and a polycondensation component with three polycondensation repeating units. Also provided is a method for making a gypsum slurry with a foaming agent in which the ratio between the dispersant component and the polycondensation component is adjusted to control for the size of foam bubbles in the gypsum slurry. Gypsum products made from the gypsum slurry are provided and methods for making the products are provided as well.

Abstract: A method of making a rapid setting lightweight homogeneous foamed fly ash based cementitious aggregate composition with improved compressive strength for products such as panels is disclosed. The method mixes fly ash, alkali metal salt of citric acid, foaming agent for entraining air, optional foam stabilizing agent, a calcium sulfate such as stucco or gypsum, and water. Compositions are also disclosed which include mixtures of fly ash, particularly Class C fly ash alone or in mixtures with Class F fly ash, alkali metal salts of citric acid, foaming agents, a calcium sulfate such as calcium sulfate dihydrate or hemihydrate and an optional portland cement.

Abstract: The present invention provides a bone cement formula having a powder component and a setting liquid component, wherein the powder component includes a calcium sulfate source and a calcium phosphate source with a weight ratio of the calcium sulfate source less than 65%, based on the total weight of the calcium sulfate source and the calcium phosphate source, and the setting liquid component comprises ammonium ion (NH4+) in a concentration of about 0.5 M to 4 M, wherein the calcium phosphate source includes tetracalcium phosphate (TTCP) and dicalcium phosphate in a molar ratio of TTCP to dicalcium phosphate of about 0.5 to about 2.5, and the calcium sulfate source is calcium sulfate hemihydrate (CSH), calcium sulfate dehydrate (CSD), or anhydrous calcium sulfate.

Abstract: Compositions comprising a hydraulic binder such as cement or gypsum and a hydroxypropyl guar derivative that comprises unsubstituted linear or branched C6-C8 alkyl chains possess excellent water retention characteristics.

Abstract: The present disclosure provides improved water-repellent admixtures for cementitious materials. The water-repellent admixtures are incorporated during masonry processing to improve the water resistance of the final product. Solid water-repellent admixtures may be conveniently incorporated into pre-blended dry mortar mixes. In some variations, a pre-blended dry mortar mix comprises a cementitious material, an aggregate, and a dry water-repellent admixture, wherein the water-repellent admixture contains one or more materials selected from the group consisting of silanes, siloxanes, free fatty acids, fatty acid derivatives, particulated polymers, and particulated copolymers, and wherein the water-repellent admixture is present in the pre-blended dry mortar mix in a dosage from about 0.01% to about 1.00% by weight of the pre-blended dry mortar mix.

Abstract: Surfactant-coated hemihydrate gypsum which is coated with 0.01 to 1 part by weight of a surfactant based on 100 parts by weight of hemihydrate gypsum, wherein the residual rate of the surfactant when the surfactant-coated hemihydrate gypsum is heated up to 300° C. is not less than 40 wt % of the amount of the surfactant before heating.

Abstract: The invention relates to O/W wax dispersions based on water, an emulsifier and a wax phase containing predominantly aliphatic hydrocarbons and polar compounds having chain lengths of at least 18 carbon atoms, and also plaster compositions comprising the O/W wax dispersion, and the use of the O/W wax dispersion.

Abstract: A hydraulic binder containing 25 to 85 wt % of cement clinker, 0 to 7 wt % of CaSO4, a mineral additive(s), and 1 to 10 wt % of a dual setting control system that includes an activator and a retarder, in a weight ratio of activator to retarder, based on the dry substance selected to be greater than 85:15, in particular greater than 90:10, more particularly greater than 95:5, and, in particular, greater than 98:2.

Abstract: Disclosed is a dry gypsum composition containing hemihydrate gypsum, at least one pigment and a crystal habit modifier. The crystal habit modifier is at least one compound selected from the group consisting of sulfate salts, carboxylate salts, carbonate salts and inorganic chlorides, and a content of the at least one compound is in a range of 0.1 to 5 parts by mass per 100 parts by mass of the hemihydrate gypsum, whereby upon hydration of the hemihydrate gypsum into dihydrate gypsum, the dihydrate gypsum is controlled to become plate crystals having an aspect ratio of 1 to 9. A gypsum-based coating formulation making use of the dry gypsum composition is also disclosed.

Abstract: This method relates to making a joint compound that includes predispersing a dedusting agent in water to make a predispersed dedusting agent. Dry components, including at least one filler, are combined to make a dry mixture. Process water is pumped into a vessel and the predispersed dedusting agent is introduced to the vessel. The dry mixture is then added to the vessel and all components are blended to make a homogeneous product.

Abstract: A method of manufacturing a water-resistant gypsum product including forming an aqueous mixture of gypsum, water and a wax mixture, wherein the wax mixture includes a hydrocarbon wax, and a substitute material selected from the group consisting of (a) an asphaltite, (b) a polyolefin homopolymer, (c) a polyolefin copolymer, and (d) combinations thereof; and forming the mixture into a structure, and drying the structure while permitting hydration of the gypsum to form a gypsum product.

Abstract: The present invention provides a liquid rheology modifier containing compounds (A) and (B) selected from combination (1) of compound (A) selected from cationic surfactants and compound (B) selected from anionic aromatic compounds and combination (2) of compound (A) from cationic surfactants and compound (B) selected from brominated compounds; and dicarboxylic acid (C).

Abstract: An application for a pre-mixed mortar, stucco or masonry composition includes a approximately 75% sand and 25% of a light-weight cement mix comprising slag cement, ground granulated blast furnace slag, sodium tall oil, sodium stearate, sodium C14-16 Alpha Olefin, linear alkyl benzene; and silicon dioxide.

Abstract: An aqueous gypsum plaster-cement composition comprises a hydraulic binder consisting of calcined gypsum and hydraulic cement in a weight ratio of from about 4:1 to about 2:1, an aggregate which comprises sand, a foam, a perlite, rice hulls or a mixture thereof, a superplasticizer comprising an air entraining agent, a retarder, and water in an amount of from about 0.4 to about 0.75 parts by weight per part of binder, with the proviso that the gypsum plaster-cement composition contains essentially neither a pozzolana nor lime. The use thereof, a method of constructing buildings using this composition and the buildings obtainable in this way are also described.

Abstract: A panel is provided that includes stucco, water and a dispersant component having dispersing properties and comprising a comb-branched polymer with polyether side chains, naphthalene sulfonate-formaldehyde condensate or melamine sulfonate-formaldehyde condensate. A polycondensation component is also included in the slurry that includes three repeating units. A method of making the gypsum panel includes combining stucco, water and a first dosage of a first dispersant to form a slurry, the first. A second dosage of a second dispersant is added to the slurry. Properties of the gypsum slurry are tested and it is formed into a product. The product sets and properties of the product are identified. The first dosage or the second dosage is changed based on the properties of the slurry or product.

Abstract: The present invention relates to construction materials comprising at least one binder, at least one oil-containing filler and at least one metallate additive according to formula (1): (RO)m-M-(Oa—Xb—R?c—Yd)n??(1) wherein M is one of titanium and zirconium. The present invention also relates to methods of preparing and using the inventive construction materials. The inventive construction material compositions are capable of utilizing oil-containing fillers in which the oil is stable in the final composition and the desired mechanical properties of the construction material are maintained or improved.

Abstract: Provided herein are mixtures, emulsions and other additives for use in manufacturing gypsum wallboard. The mixtures and emulsions may be wax-based emulsions or wax-free mixtures or emulsions, with wax-based emulsions including water; at least one wax, a dispersant which may include sulfur or a sulfur-containing group, and a particular wetting agent or surfactant. Mixtures may also be prepared including water, a dispersant, and a particular wetting agent or surfactant. Gypsum slurries may be prepared using such emulsions and mixtures.

Abstract: Compositions comprising a hydraulic binder such as cement or gypsum and a hydroxypropyl guar derivative that comprises unsubstituted linear or branched C6-C8 alkyl chains possess excellent water retention characteristics.

Abstract: The invention relates to a mixture of a calcium sulfate-based mineral binder and at least one additive that imparts hydrophobic properties to the calcium sulfate-based mineral binder. Said additive is a salt, a hydrophilic fatty acid, or a binder mixture containing fatty acid salts. The content of fatty acid salts of fatty acids that have 8 to 17 C atoms amounts to at least 20 percent by weight relative to the total amount of fatty acid salts in the fatty acid salt mixture, or the content of fatty acids that have 8 to 14 C atoms amounts to at least 10 percent by weight relative to the total amount of fatty acid salts in the fatty acid salt mixture, or both. The construction materials according to the invention can be gypsum boards, gypsum blocks, or other molded parts, especially gypsum plasterboards.

Abstract: Disclosed is a dry gypsum composition containing hemihydrate gypsum, at least one pigment and a crystal habit modifier. The crystal habit modifier is at least one compound selected from the group consisting of sulfate salts, carboxylate salts, carbonate salts and inorganic chlorides, and a content of the at least one compound is in a range of 0.1 to 5 parts by mass per 100 parts by mass of the hemihydrate gypsum, whereby upon hydration of the hemihydrate gypsum into dihydrate gypsum, the dihydrate gypsum is controlled to become plate crystals having an aspect ratio of 1 to 9. A gypsum-based coating formulation making use of the dry gypsum composition is also disclosed.

Abstract: The present invention relates to a plaster-based material which includes an agent capable of trapping formaldehyde, in particular a plasterboard intended for the interior fittings of residential buildings. The agent capable of trapping formaldehyde is chosen from ethylene urea and its derivatives, compounds comprising active methylene(s), sulphites, tannins and their mixtures. Another subject-matter of the invention is the use of the said material for reducing the amount of formaldehyde present in the atmosphere inside residential buildings.

Abstract: The invention provides a set gypsum-containing product having increased resistance to permanent deformation and a method for preparing it comprising forming a mixture of a calcium sulfate material, water, and an appropriate amount of one or more enhancing materials chosen from condensed phosphoric acids, each of which comprises 2 or more phosphoric acid units; and salts or ions of condensed phosphates, each of which comprises 2 or more phosphate units. The mixture is then maintained under conditions sufficient for the calcium sulfate material to form a set gypsum material.

Abstract: The invention relates to a method for producing a coated basic material for a hydraulic composition (11) comprising a basic material (14, 16) and water (15). According to the invention, the basic material can consist of several sub-groups (14, 16) and at least one hydraulic binding agent (14) and to produce the hydraulic composition the basic material (14, 16) and the water (15) are mixed in a mixer (8). Prior to the mixing of the hydraulic composition, the basic material (14, 16) is at least partially coated with an additive (13). The invention also relates to a coated basic material to be used in concrete production, to an additive for concrete production and to a method for producing a hydraulic composition.

Abstract: The invention generally provides gypsum-containing slurries including stucco, naphthalenesulfonate dispersant, and pregelatinized starch. The naphthalenesulfonate dispersant is present in an amount of about 0.1%-3.0% by weight based on the weight of dry stucco. The pregelatinized starch is present in an amount of at least about 0.5% by weight up to about 10% by weight of pregelatinized starch by weight based on the weight of dry stucco in the formulation. Other slurry additives can include trimetaphosphate salts, accelerators, binders, paper fiber, glass fiber, and other known ingredients. The invention also comprises the gypsum-containing products made with such slurries, for example, gypsum wallboard, and a method of making gypsum wallboard.

Abstract: The use of a mixture of at least one polyol and at least one cyclohexanepolycarboxylic acid derivative for reducing or minimizing the dust emission when handling pulverulent construction chemistry products, processes for the preparation of the pulverulent construction chemistry products and hydraulically setting materials containing the mixture according to the invention are proposed.

Abstract: The present invention relates to a setting retarder for compounds that set hydraulically, containing at least one at least simple adduct and/or condensate, the retarder being produced by the reaction of at least one protein hydrolysate, one pure amino acid, amino acid mixture, and/or the hydrochlorides thereof having at least one mono-, di-, oligo- and/or polycarboxylic acid which is not derived from an amino acid, and/or a carboxylic acid derivative derived therefrom, wherein the carboxylic acid is selected from a group including carboxylic acid anhydrides, carboxylic acid halogenides, and/or carboxylic acid active esters.

Abstract: An application for a pre-mixed mortar, stucco or masonry composition includes a approximately 75% sand and 25% of a light-weight cement mix comprising a cement (either Portland cement or Gypsum), ground granulated blast furnace slag, sodium tall oil, sodium stearate, sodium C14-16 Alpha Olefin, linear alkyl benzene; and silicon dioxide.

Abstract: Emulsions, and processes for making the emulsions, useful for imparting water resistance to gypsum products are disclosed. Process for making the emulsion and gypsum products made from the emulsion are also disclosed. The emulsions of the invention include at least one paraffin wax and a hydrophilic metallic salt. The emulsions of the invention may further include a saponifiable wax substitute for montan wax. The emulsions of the invention may further include a biocide.

Abstract: This document provides household and garden products, and methods for making such products. For example, household and garden products comprised of selected waste products from industrial processes combined with a binder are provided. In addition, products formed by mixing calcium sulfate dihydrate with a binder to form a mixture are provided.

Abstract: A cementitious composition the properties of which are useful for: a) reducing shrinkage cracking in stucco systems due to excess water present in initial mixing required to achieve adequate slump necessary for application, but not necessary for material hydration b) reducing full thickness cracking as a result of minor structural movement by increasing the flexural strength, c) reducing the time required to place the layers of a three-coat exterior stucco system. The composition of this material is a blend of ASTM C 150 Portland cement, an ASTM C 1328 Plastic (Stucco) cement and a minor amount of a sulfonated naphthalene formaldehyde condensate (SNF), also described as Polynaphthalene sulfonates (PNS) cement superplasticizer, also known as a HRWR (High Range Water Reducer).

Abstract: A lightweight construction material, a method of fabricating building panels utilizing said material and device therefore. The formulation utilizes silicone-treated expanded perlite in combination with cement, alpha gypsum, polyvinyl alcohol fibers and powder, and water. Building panels are formed utilizing fiber mesh to reinforce them while minimizing their weight. The building panel may be formed with one layer or two layers of different formulations.

Abstract: A method for preparing a modified beta-stucco from calcined natural rock gypsum that includes preparing a solution of liquid diethylene-triamine-pentaacetic acid in water, applying the solution onto beta-stucco while hot from the calciner, forming a wetted beta-stucco, and allowing the wetted stucco to dry and heal, forming the modified beta-stucco.