Abstract: The compositions of the invention are hot melt urethane compositions for application in the molten star at temperatures of from about 121.1.degree.-232.2.degree. C. having viscosities of less than 50,000 cps which upon cooling form an elastomeric solid.

Abstract: A thermosetting resin composition which comprises (A) a resin in which at least one compound having a graft-reactive group such as a carboxyl group, a primary amino group or a secondary amino group and a carboxylic anhydride group has been grafted on a polycarbodiimide and (B) an epoxy compound. The said thermosetting resin composition retains heat resistance, electrically insulating properties and mechanical properties characteristic of polycarbodiimide, is excellent in solubility in various solvents and storage stability in the form of a solution and can be easily cured under mild conditions, and can produce a cured product excellent in humidity resistance, transparency, chemical stability and adhesiveness to various substrates.

Abstract: N-Methylol derivatives of polycondensation products containing quaternary N atoms obtained fromA) basic ureas of the formulaHN(R.sup.1)--C--N(R.sup.2)--X.sup.1 --N(R.sup.3, R.sup.4) (I),B) polyamines of the formula(R.sup.6, R.sup.7)N--X.sup.2 --N(R.sup.8, R.sup.9) (II)andC) bifunctional alkylating agents,in whichX.sup.1, X.sup.2 and R.sup.1 -R.sup.9 have the meanings given in the description, are new. They are used as agents for improving the wet fastness properties of dyeings on cellulose and cellulose blend fabrics.

Abstract: A polymer material of the fluorine-containing polyurethane acrylate type for coating an optical fiber or for an optical fiber tape, the material being based on at least a diol, a diisocyanate, and an acrylate, and being characterized by the fact that at least one of the above compounds contains fluorine and that at least one of the above compounds contains sulfur.

Abstract: Described are moisture-curing alkoxysilane-terminated polyurethanes which can be obtained by reacting polyurethane prepolymers with a mean NCO functionality of at least 1 but less than 2 with special sulfur-free alkoxysilanes, reacting with substantially all the free NCO groups. Also described is the use of these compounds as sealing and/or adhesive compositions.

Abstract: A method of preparing a carbamate-functional acrylic polymer is described, comprising the steps of:(A) preparing a mixture comprising:(1) one or more acrylic monomers comprising hydroxy-functional groups or groups that can be converted to hydroxy functional groups,(2) optionally, one or more other addition polymerizable monomers, and(3) a carbamate compound, and(B) heating said mixture in the presence of a free radical initiator and an esterification catalyst, thereby forming a carbamate-functional acrylic polymer.

Abstract: In a process for crosslinking a polymer, a .beta.-dicarbonyl functionality is present as a reactive diluent and/or as a reactive solvent and/or on a crosslinking entity. The .beta.-difunctional compound reacts with formaldehyde which is either released during the crosslinking reaction (or otherwise present) whereby less formaldehyde is released, than would otherwise be released. The formaldehyde which reacts with the .beta.-dicarbonyl compound is either incorporated into the crosslinked polymer network or released in the form of a reaction product which is not as harmful to the environment as the unreacted formaldehyde. The process enables the reduction of formaldehyde release during crosslinking to levels otherwise unobtainable. Furthermore, the process enables a reduction in the amount of organic solvent utilized.

Abstract: A catalyzed polyurethane reactive hot melt adhesive is prepared from a reactive polyurethane prepolymer and 0.05 to 0.6% by weight of a 2,2'dimorpholinoethyl ether or di(2,6-dimethylmorpholinoethyl)ether catalyst. The adhesive is characterized by improved curing speed with little or no effect on the thermal stability.

Abstract: The present invention provides a screen printable coating composition comprising one or more hydroxy functional materials (I), one or more crosslinkers (II) for curing the hydroxy functional materials, and one or more crystalline reactive diluents (III). The coating composition may also include one or more catalysts (IV), plasticizers (V), rheology modifiers (VI), waxes (VII) and coloring agents (VIII). Various additives and fillers may also be included in the coating composition.

Abstract: Triazine compounds useful as flame retardants have the formula: ##STR1## where Am represents an amino group, Pp represents a phosphonate group and Z represents an amino group or a phosphonate group, or are polymers comprising repeating units of the formula: ##STR2## where ##STR3## is a diamine residue. The triazine compounds are used as flame retardants in plastics materials, particularly polyurethane foam or artificial fibres, or in intumescent fire protection compositions.

Abstract: A process for producing an impact-resistant polyacetal resin composition, which comprises a first step of mixing with shear a polyacetal resin (A), a thermoplastic polyurethane (B) and a polyhydric alcohol (C) having at least three hydroxyl groups in the molecule at a temperature of 180.degree. to 250.degree. C. and at a temperature at which said polyacetal resin (A) and said thermoplastic polyurethane (B) melt; and a second step of mixing with shear the resulting mixture obtained in the first step, in the presence of at least one compound (D) selected from the group consisting of a polyisocyanate (d.sub.1) and a compound (d.sub.2) which generates a polyisocyanate under heat, at a temperature of 180.degree. to 250.degree. C. and at a temperature at which said polyacetal resin (A) and said thermoplastic polyurethane (B) melt.

Abstract: This invention provides a method of forming a joint in an abrasive belt using a novel joint adhesive comprising a polyesterurethane, a cross-linking agent and a reactive polyol solvent.

Abstract: Thermoplastic molding compositions and articles comprise immiscible thermoplastic polymer components and reinforcing fibers. The immiscible thermoplastic polymer components and the fibers are blended together under high shear conditions. The molding composition generally contains at least two phases and has an extremely smooth and fiber-free surface. Generally, other very good physical properties are obtained such as high heat distortion temperatures, high tensile modulus, high flex modulus, and the like are also very good. A desired blend of thermoplastic components is thermoplastic polyurethane and modified polyethylene terephthalate with glass fibers. The molded polyethylene terephthalate copolyester blended with an immiscible thermoplastic polymer, preferably modified polyurethane, and glass fibers produces thermoplastic molding compositions and articles having surprisingly superior impact strength.

Abstract: A method for preparing a polyamide-imide-modified polyurethane varnish composition for coating a conductive wire to form a varnished wire. The method comprises the steps of: (a) preparing a first intermediate reaction product, which is an isocyanate compound, (b) preparing a second intermediate reaction product, which is a hydroxy compound, and (c) mixing the first and second intermediate reaction products with a diluent to form the polyamide-imide-modified polyurethane varnish composition. The first intermediate reaction comprises the steps of: (I) preparing a first reaction mixture containing a phenol or a derivative of phenol, a diisocyanate, and a dihydroxy compound in a first organic solvent, and reacting the first reaction mixture at room temperature; (ii) adding a diacid compound or trimellitic anhydride or mixture thereof to the first reaction mixture, and reacting at 100.degree..about.140.degree. C.

Abstract: Rigid-rod macromonomers, and methods for preparing such macromonomers, having a polyaromatic backbone, solubilizing side groups, and reactive side groups are provided. The macromonomers are chemically incorporated into polymer systems to provide stronger, stiffened polymers.

Abstract: Curable compositions are disclosed comprising:(A) carbamate-functional compound that is the reaction product of a mixture comprising:(1) a monomeric polyisocyanate, and(2) a compound comprising a group that is reactive with isocyanate and a carbamate group or group that can be converted to carbamate, and(B) a compound having a plurality of functional groups that are reactive with carbamate groups on said carbamate-functional compound.

Abstract: Methods of using a mixture as a corrosion inhibitor, moisture scavenger, formaldehyde scavenger, rheological modifier, thermoplastic foam inhibitor, antifreezing agent, decolorizing agent, drying agent and corrosion inhibitor are provided by the present invention. The mixture comprises an aldimine oxazolidine compound having the formula: ##STR1## wherein: R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5, R.sub.6, R.sub.7 and R.sub.8 are, individually, a hydrogen atom, a methyl or methylol group, an ethyl or ethylol group, a straight chain or branched chain alkyl or alkanol group, a cycloalkyl group, or an aryl group, including any of the above groups substituted by nitro, halogen, thiol and amino functional groups, such that when R.sub.5, R.sub.6, R.sub.7 and R.sub.8 are hydrogen atoms, R.sub.3 and R.sub.4 are not hydrogen atoms, further, R.sub.7 and R.sub.

Abstract: The present invention provides a composition that softens at a predetermined temperature, preferably between about 20.degree. C. and 90.degree. C., and more preferably between about 20.degree. C. and about 62.degree. C., comprising at least one block copolymer having at least two thermal transition temperatures. The composition is characterized by at least two thermal transition temperatures, one of which is a predetermined lower transition temperature, preferably between about 20.degree. C. to 90.degree. C., and more preferably between about 20.degree. C. to about 62.degree. C., and one of which is an upper transition temperature. The present invention also provides a method of making the composition, a method of making biomedical materials and articles, and toys and toy components, with shape-memory properties from the composition, and biomedical materials and articles, and toys and toy components, with shape-memory properties made from the composition.

Abstract: A homogeneous polymer blend is disclosed containing components A and B. Accordingly A is about 1 to 30% by weight of a rigid, rod-shaped polymer having a persistence length of at least 10 nm and a ratio of molecular length to molecular diameter of at least 30, and B) is about 70 to 99% by weight of a flexible polymer which contains at least one member selected from the group consisting of non-ionic polar groups, ionic groups and groups convertible into ions. The flexible polymer is any one of polyolefins, polyacrylates, polyamides and polyurethanes. Component A) contains at least one chemically fixed member selected from the group consisting of non-ionic polar group, ionic group and a group convertible into ionic group, in an amount sufficient to render said A) and B) compatible one with the other.

Abstract: The invention relates to a process for the treatment of the periphery of a glass, more particularly an encapsulated glass, which consists of treating part of the surface of the glass by at least one silane and a composition able to form a layer having free OH groups. This process is useful for treating glass so that a resin, such as a polyurethane, upon contact with the treated glass will readily adhere and bond to the glass. The treated glass can be fitted into car body bays or openings.

Abstract: Internal polymeric surfaces of medical devices are provided that have enhanced biocompatibility properties. The internal polymeric surface presents an anti-thrombogenic, fibrinolytic or thrombolytic interface with body fluids such as blood flowing through medical device tubing during implantation for medical procedures. The biocompatibility enhancing agent is secured to the polymeric substrate by a spacer molecule which is covalently bound to the internal polymeric surface which had been subjected to radiofrequency plasma treatment with a low pressure plasma medium of water vapor, oxygen or combination of water vapor and oxygen gas.

Abstract: Oligoester acrylate resins having a high content of solids and comparatively low viscosity, and aqueous coating agents with a low content of organic solvents for obtaining coatings with high resistance to chemicals, more particularly high resistance to acids and oily soot, and very low tendency to yellowing.

Abstract: A polyurethane adhesive composition prepared by incorporating phosphorus oxy acid or a derivative thereof, an amine compound and an epoxy resin into an organic polyisocyanate and an organic polyol.The polyurethane adhesive composition is employed in the manufacture of composite films by lamination of various plastic films, metal foils and so forth. The composition is excellent in adhesive properties, acid resistance and hot water resistance.

Abstract: Reactive aminoquinones of formula I or II ##STR1## wherein R is hydrogen, branched, linear or cyclic C.sub.1 -C.sub.6 alkyl, aralkyl, or phenyl which may be substituted by linear, branched or cyclic C.sub.1 -C.sub.4 alkyl, --NO.sub.2, F, OR.sup.2, NR.sup.3.sub.2, wherein R.sup.2 and R.sup.3 are linear, branched or cyclic C.sub.1 -C.sub.6 alkyl, aralkyl or phenyl,R.sup.1 is a linear, branched or cyclic C.sub.2 -C.sub.18 alkylene chain, phenylene, aralkylene, alkarylene, or --(CH.sub.2 CH.sub.2 --O).sub.n --CH.sub.2 --CH.sub.2 --, wherein n is an integer from 1 to 50,X is hydroxy, epoxy, vinyl, vinyloxy, acrylate, methacrylate or acylchloroY is N or CH; andR.sup.4 is linear or branched C.sub.1 -C.sub.6 alkyl which are useful in forming copolymers to prepare corrosion resistant binder compositions for magnetic information storage media, the copolymers formed, the magnetic information storage media and a method for improving corrosion resistance in magnetic particles are provided.

Abstract: The present invention relates to polyisocyanate mixtures which are solid below 40.degree. C. and liquid above 125.degree. C. and which havea) an average isocyanate functionality of at least 2.1,b) a content of free isocyanate groups bonded to tertiary (cyclo)aliphatic carbon atoms (calculated as NCO; molecular weight=42) of 5 to 22 wt. %,c) a urethane group content calculated as --NH--CO--O--; molecular weight=59) of 2 to 30 wt. %,d) an isocyanurate group content (calculated as C.sub.3 N.sub.3 O.sub.3 ; molecular weight=126) of 0 to 30 wt. % ande) a carboxylic acid ester group content (calculated as --CO--O--; molecular weight=44) of 0 to 25 wt. % and/orf) a carbonate group content (calculated as --O--CO--O--; molecular weight=60) of from 0 to 34 wt. %with the proviso that the total amount of ester groups e) and carbonate groups f) is at least 2 wt. %.

Abstract: Fluoroinfused composites exhibiting low surface energy and low kinetic coefficent of energy are prepared via contact of a swellable polymeric material with a solution comprising a swelling solvent, an organofluorosilane and a gelling agent.

Abstract: The invention relates to a new polyamine of the following composition: ##STR1## wherein 1.gtoreq.n.gtoreq.6, R represents the hydrocarbon radical of a (cyclo)aliphatic, araliphatic or aromatic diisocyanate having 6-20 C atoms or a trimer thereof andwherein when 2.gtoreq.n.gtoreq.6,R.sup.1 represents an n-valent organic radical such as is formed by removal of n OH groups from a polyhydroxy compound which optionally contains ether oxygen atoms and has an average molecular weight Mn of between 60 and 5,000; andwhen n=1,R.sup.1 represents ##STR2## It furthermore relates to a process for the preparation of a polyamine, in which certain diisocyanates, adducts of diisocyanates with polyols or trimers thereof are reacted with the Schiff base of the following composition: ##STR3## wherein R.sup.2 =H or a branched or unbranched C.sub.1-14 -alkyl radical and R.sup.3 =a branched or unbranched C.sub.1-14 -alkyl radical, an C.sub.1-14 alkyl-substituted phenyl radical or a C.sub.1 -C.sub.

Abstract: Moisture-hardening one-component polyurethane paints for coating elastomeric parts, consisting of polyfunctional isocyanate compounds, solvents and, optionally, auxiliaries and/or coupling agents, which contain reactive polysiloxanes and reactive surfactants for improving surface slip, may be applied by a simple painting process to elastomers, particularly apolar elastomers, for example based on styrene-butadiene rubber or polyethylene-propylene-diene and, after drying, have an optically smooth surface with good surface-slip properties with respect to glass and no abrasive effect.

Abstract: A NCO-free, free radical-curable polyurethane coating composition which is particularly suitable for application on heat sensitive substrate is disclosed. The coating contains an allylether-capped isocyanate prepolymer and at least one additional isocyanate prepolymer which is capped with a hydroxyalklyl(meth)acrylate. The composition of the invention yields coatings having good dry time and hardness. An additional embodiment relates to aqueous dispersions of the composition of the invention and to films made therefrom.

Abstract: Synthetic biomaterials are provided with irreversibly bound amino diphosphonate, polyphosphonate, or other anticalcification agent to prevent in vivo calcification. Such biomaterials include biocompatible elastomers such as polyurethane and/or polydimethylsiloxane, and the like which are intended for invasive, or in-dwelling use in a human or animal body. Illustratively, reaction conditions utilizing hi-or polyfunctional epoxides result in epoxide bridge incorporation of the anticalcification agent to the biomaterial elastomer.

Abstract: A hydroxy-functional acrylic polymer useful in multicomponent curable compositions wherein the curable composition contains castor oil and at least one polyisocyanate in addition to the hydroxy-functional acrylic polymer. The hydroxy-functional acrylic polymer comprises vinyl toluene, a monomer selected from lauryl methacrylate and stearyl methacrylate, and a hydroxy-functional monomer selected from hydroxypropyl methacrylate and hydroxypropyl acrylate, and is compatible with castor oil.

Abstract: A biocompatible, hydrophilic, segmented block polyurethane copolymer which comprises 5 to 45 wt % of a hard segment and 95 to 55 wt % of a soft segment selected from a hydrophilic, hydrophobic and amphipathic oligomer is disclosed. The copolymer is capable of forming a non-porous, semi-permeable film of a tensile strength greater than 300 and up to 10,000 psi, and has an ultimate elongation greater than 300% and up to 1,500% and a water absorption such that the sum of the volume fraction of absorbed water and the hydrophilic volume fraction of the soft segment exceeds about 100% and is up to about 2,000% of the dry polymer volume. The film is permeable to cell nutrients and waste molecules of up to about 6,000 to 600,000 molecular weight and is substantially impermeable to cells and particulate matter. A non-porous, semi-permeable, biocompatible film is formed from the block copolymer of the invention in the form of a flexible sheet or a hollow fiber.

Abstract: A polycarbonate pellet having a size between 200 and 1,500 microns, not inclusive, is produced by extruding molten polycarbonate through a die and cutting such extrudate with a die face cutter.

Abstract: Fluid gasket composition with fine rubber particles has sufficient elasticity. The particle size of the rubber particles contained in the fluid gasket composition is desired to be 0.1 to 3.0 mm. The fluid gasket composition applied to a joint portion between mechanical parts or the like exhibits an effect of sealing and absorbing vibrations, dislocation and mechanical movements taking place in the mechanical parts.

Abstract: Novel neopentasiloxane compounds of the general formula Si[OSiR.sub.2 Q].sub.4 wherein R denotes a monovalent hydrocarbon or halohydrocarbon group and Q denotes a group R or a group comprising a block of at least two oxyalkylene units and having a terminal group containing a reactive hydrogen atom, not more than one Q denoting an R group. The invention also encompasses a film-forming composition comprising a curable polyurethane resin and the neopentasiloxane, and the use of the film-forming compositions to provide breathable (water vapour permeable) coatings on textile fabrics.

Abstract: The present invention provides a curable composition which employs the oxazolidineimine ring-forming reaction between an epoxide and a carbodiimide for curing and which cures under a mild condition in a short period of time with little side reaction to obtain a polycarbodiimide resin having good strength, heat resistance and processability. The curable composition of the present invention comprises (a) a polycarbodiimide, (b) a polyepoxide and (c) a zinc halide or a mixture of zinc halide and an onium salt as a catalyst.

Abstract: Disclosed is cyclic urea derivatives represented by the following formula (A): ##STR1## wherein n is an integer of 0 or 1; m is an integer of 1 to 15; X is oxygen, sulfur or --NR.sub.1 -- (R.sub.1 is hydrogen or an alkyl group having 1 to 5 carbon atoms); R is an alkyl-, cycloalkyl -, aryl-, aralkyl-, alkaryl- and glycidyl group having 1 to 27 carbon atoms, or an alkyl-, cycloalkyl-, aryl-, aralkyl- and alkaryl group containing at least one ##STR2## O, S and N and having 1 to 27 carbon atoms with a molecular weight of 15 to 500, said groups substituted by glycidyl-, hydroxylic-, nitro groups, halogens, cyano-, formyl- or amino groups, or polyester-, polyether-, polyurethane and polyamide groups having a molecular weight of 500 to 100,000.

Abstract: Curable compositions are disclosed comprising:(A) a carbamate-functional polymer that is the reaction product of a mixture comprising:(1) a polymer that is the reaction product of a mixture comprising:(a) a polyisocyanate and(b) an active hydrogen-containing chain extension agent, and(2) a compound comprising a group that is reactive with said polymer (A) (1) and a carbamate group or group that can be converted to carbamate, and(B) a compound having a plurality of functional groups that are reactive with carbamate groups on said carbamate-functional polymer.

Abstract: A coating composition is described comprising two components that are reactable with each other to cure the coating. The two components are:(a) a carboxyl-functional polyurethane component that is the reaction product of:(i) a polyisocyanate compound, and(ii) a compound comprising at least one acid group and at least one isocyanate-reactive group,(b) a component comprising at least two groups that are reactive with the epoxy groups on the polyurethane compound.

Abstract: Crosslinking components for cationic paint binders which are reaction products of hydroxyl-functional carbamate compounds with half-blocked diisocyanates are described. The carbamate compounds are reaction products of cyclic organic carbonates with aliphatic monoamines and/or diamines and/or triamines and/or tetraamines and/or alkanolamines, all such amines having primary and/or secondary amino groups. The crosslinking components produced according to the invention, in combination with resin components carrying hydroxyl groups and/or primary or secondary amino groups, preferably with those based on epoxide/amine adducts or containing similar molecular units, give binders which can be baked at temperatures of 140.degree. C. and higher.

Abstract: A process for the preparation of recyclate polyols obtained by glycolysis of polyurethanes and/or polyurea-polyurethanes comprises metering in monofunctional and/or difunctional glycidyl ethers over the entire course of the reaction; the low-amine recyclate polyols obtained in this way are used for the preparation of cellular or noncellular polyurethanes.

Abstract: Ungelled, aqueous dispersions of silane-terminated partially crosslinked polyurethane polymers are described which are the reaction product of A) an isocyanate-containing prepolymer formed from: (i) a molar excess of organic polyisocyanate sufficient to promote substantially equal access to isocyanate groups; (ii) active hydrogen-containing material; (iii) sterically hindered amines; (iv) emulsifying monomer; B) chain-extending monomer; C) an organic compound having a pKb of at most about 7; and D) a silane coupling agent represented by the general formula ASi(OR.sup.2).sub.3 and present in an amount sufficient to partially crosslink the polyurethane resin but insufficient to gel the dispersion, provide advantages over previously known polyurethanes used as surface coatings. The hindered amine allows surface coatings incorporating the polyurethanes to be easily removed by aqueous compositions having pH between about 2 and 5. Methods of making the prepolymers, polymers, and dispersions are also presented.

Abstract: A non-yellowing, impact resistant high hard segment polyurethane made from a non-aromatic diisocyanate, a diol chain extender and an aminodiol chain extender may also contain up to five percent by weight of a macroglycol. A catalyst free method to prepare the polyurethane is a feature of the invention.

Abstract: Photocurable liquid coating compositions adapted to provide primary coatings for optical glass fibers are disclosed. These compositions comprise an acrylate-terminated polyurethane, an acrylate of an unsubstituted or C.sub.1 -C.sub.10 alkyl substituted phenol that is alkoxylated with a C.sub.2 -C.sub.4 alkylene oxide and at least one alkylacrylate having a T.sub.g below about -45.degree. C. Films produced from these ultraviolet light curable compositions are flexible and possess good water resistance and good wet adhesion.

Abstract: The golf ball is made from a composition of a polyurethane prepolymer and a slow-reacting polyamine curing agent and/or a difunctional glycol. The slow-reacting polyamine curing agents and difunctional glycols are 3,5-dimethylthio-2,4-toluenediamine; 3,5-dimethylthio-2,6-toluenediamine; N,N'-dialkyldiamino diphenyl methane; trimethyleneglycol-di-p-aminobenzoate; polytetramethyleneoxide-di-p-aminobenzoate; 1,4-butanediol; 2,3-butanediol; 2,3-dimethyl-2,3-butanediol; ethylene glycol; and mixtures thereof.

Abstract: A process for producing an impact-resistant polyacetal resin composition, which comprises mixing with shear a polyacetal resin (A), a thermoplastic polyurethane (B), a polyhydric alcohol (C) having at least three hydroxyl groups in the molecule and at least one compound (D) selected from the group consisting of a polyisocyanate (d.sub.1) and a compound (d.sub.2) which generates a polyisocyanate under heat, while at least two components (A) and (B) are melted. An injection-molded article from the impact-resistant polyacetal resin composition, provided by the above process, exhibits superior tensile strength and elongation at break at weld portions.

Abstract: The invention relates to a process for the production of polymers containing ammonium groups in which OH-functional polymers are first reacted with isocyanates corresponding to general formula IOCN--R--CH.sub.2 --X Iin which R represents C.sub.2-11 alkylene or arylene and X represents halogen, to form urethanes and the urethanes are subsequently reacted with tertiary aliphatic amines corresponding to formula II ##STR1## in which R.sup.1 to R.sup.3 may be the same or different.

Abstract: The present invention relates to a thermosetting resin having high thermal resistance, high strength, flame resistance, and good processability which can be obtained by reacting polycarbodiimide substantially produced from one or more kinds of organic polyisocyanate with crosslinking agents having two or more active hydrogen groups in their molecules, one or more kinds of compounds having epoxy groups in their molecules or compounds capable of accelerating the trimerization reaction of carbodiimide, and production methods thereof.

Abstract: A polymer polyol composition comprising a continuous phase, a disperse phase within the continuous phase, and a dispersant to enhance the stability of the polymer polyol is disclosed. The dispersant is a grafted polyol-polyacrylate dispersant comprised of a isocyanate vinyl monomer/ethylenically unsaturated monomer random copolymer and a polyoxyalkylene polyether, wherein the random copolymer and the polyoxyalkylene polyether are connected through at least one urethane graft site.Methods of preparing the polymer polyol composition and the grafted polyol-polyacrylate dispersant are provided. The polymer polyol compositions have low viscosities as well as high stability and may be prepared with high levels of dispersed vinyl polymer and high styrene:acrylonitrile ratios in the dispersed vinyl polymer. The polymer polyol compositions are useful for the preparation of polyurethanes, particularly polyurethane foams.

Abstract: A film-forming copolymer is formed by copolymerising 100 parts of a curable polyurethane resin and 10 to 100 parts of an organosilicon compound, consisting essentially of SiO.sub.2, R.sub.3 SiO.sub.1/2 and R'R.sub.2 SiO.sub.1/2 units, the ratio of monovalent units to tetravalent units being from 0.4/1 to 2/1 and from 40 to 90% of all monovalent units being R'R.sub.2 SiO.sub.1/2 units. R is a monovalent hydrocarbon group having up to 8 carbons and R' denotes a OH-terminated polyoxyalkylene group. The invention also includes a method of making fabrics waterproof and permeable to water vapour by coating it with such copolymer.