Abstract: Powder coating composition which comprises a hybrid polymer system in granular form of a polymer A formable from monomer(s) by aqueous suspension polymerisation and a polymer B, different to A, which polymer system has been obtained using a process which comprises dissolving polymer B in monomeric material to be used in the formation of polymer A, polymerising the monomer(s) to form polymer A using an aqueous suspension polymerisation process, and removing the aqueous phase to form a hybrid of the polymers A and B in granular form, and wherein polymer A and polymer B bear functional groups for imparting curability to the hybrid polymer system, and wherein further the hybrid polymer system has a number average molecular weight within the range of from 1500 to 15,000.

Abstract: Aqueous curable polymer dispersion comprising a polyester and/or polyurethane and a polymeric product having a Tg from 25.degree.-100.degree. C. obtainable by free-radical polymerisation of a mixture of (a) an olefinic monomer free from epoxy and epoxy reactive groups, (b) a monomer and/or oligomer having at least two epoxy groups and (c) a group reactive towards epoxy groups.

Abstract: The subject of this invention is acrylic polymer plastisol compositions, wherein the acrylic polymer component of the plastisol composition is a single-stage methyl methacrylate copolymer derived from methyl methacrylate and a comonomer component comprising isobutyl methacrylate and optionally other comonomer(s). The selection of isobutyl methacrylate as a comonomer with the methyl methacrylate results in good compatibility with a wide range of plasticizers and without undue softness in the resulting plastisol.

Abstract: A nonionic dispersing agent suitable for use in the production of aqueous polyurethane dispersions, said agent having the formula: ##STR1## wherein R.sup.1 represents a monovalent hydrocarbon radical containing 1-12 carbon atoms;R.sup.2 represents hydrogen or a mixture thereof with methyl and/or ethyl, at least 40% of the R.sup.2 substituents in said mixture being hydrogen;R.sup.3 represents an isocyanate-reactive organic radical;R.sup.4 represents H or an isocyanate-reactive organic radical;Z represents an alkylene radical containing 2-4 carbon atoms;m is an integer from 5 to 150, andn is 0 or 1.

Abstract: A nonionic dispersing agent suitable for use in the production of aqueous polyurethane dispersions, said agent having the formula: ##STR1## wherein R.sup.1 represents a monovalent hydrocarbon radical containing 1-12 carbon atoms;R.sup.2 represents hydrogen or a mixture thereof with methyl and/or ethyl, at least 40% of the R.sup.2 substituents in said mixture being hydrogen;R.sup.3 represents an isocyanate-reactive organic radical;R.sup.4 represents H or an isocyanate-reactive organic radical;Z represents an alkylene radical containing 2-4 carbon atoms;m is an integer from 5 to 150, andn is 0 or 1.

Abstract: A nonionic dispersing agent suitable for use in the production of aqueous polyurethane dispersions, said agent having the formula: ##STR1## wherein R.sup.1 represents a monovalent hydrocarbon radical containing 1-12 carbon atoms;R.sup.2 represents hydrogen or a mixture thereof with methyl and/or ethyl, at least 40% of the R.sup.2 substituents in said mixture being hydrogen;R.sup.3 represents an isocyanate-reactive organic radical;R.sup.4 represents H or an isocyanate-reactive organic radical;Z represents an alkylene radical containing 2-4 carbon atoms;m is an integer from 5 to 150, andn is 0 or 1.

Abstract: An aqueous dispersion of a water-dispersible polyurethane having pendent fluoroalkyl groups, said polyurethane being the product of chain extending, in aqueous medium, a water-dispersible, isocyanate-terminated polyurethane prepolymer having pendent fluoroalkyl groups.

Abstract: A water dispersible polyester polymer is described having one or more polyester chains and one or more non-ionic polyoxyalkylene chains in which at least 40% of the repeating oxyalkylene units are oxyethylene units. The polyester polymer has a structure in which one or more of the polyoxyalkylene chains are pendent to at least one of the polyester chains. The poloxyalkylene chains provide the polyester with non-ionic stabilization enabling the polyester to form aqueous dispersions which possess good colloid stability.

Abstract: Production of an aqueous-based composition comprising a fluoropolymer and a vinyl copolymer by (1) preparing a non-aqueous solution of a fluoropolymer comprising repeat units derived from at least one fluorolefine and repeat units bearing chain-pendant disperser groups imparting water-emulsifiability or water-solubility to the fluoropolymer; (2) converting the non-aqueous solution formed in step (1) into an aqueous-based emulsion or solution of said fluoropolymer; and (3) polymerising at least one vinyl monomer to form a vinyl polymer in the presence of said aqueous-based emulsion or solution from step (2).

Abstract: Coating composition suitable for treating a surface so as to provide water-erodible coating thereon, which composition comprises at least one erodible polymer comprising one or more hydrolysable groups selected from sulphonate esters and sulphonate esters which in an aqueous environment will generate by hydrolysis corresponding polymer-bound acid groups. The erodible polymers are described in detail and a method of treating surfaces using the composition is described.

Abstract: Coating composition suitable for treating a surface so as to provide a water-erodible coating thereon, which composition comprises at least one erodible polymer comprising one or more hydrolysable groups selected from sulphonate esters and sulfphonate esters which in an aqueous environment will generate by hydrolysis corresponding polymer-bound acid groups. The erodible polymers are described in detail and a method of treating surfaces using the composition is described.

Abstract: Aqueous-based, film-forming and ambient-temperature autoxidisably crosslinkable coating composition comprising an aqueous latex of a film-forming copolymer having residual unsaturation for autoxidative cross-linking puuposes, an autoxidation catalyst, preferably a drier salt, and optionally a multi-functional crosslinking material, wherein the copolymer has a gel fraction of at least 5% by weight which has been formed by the early addition of a multi-functional comonomer in the copolymerization, with a low reactivity multi-functional comonomer being added late in the copolymerization to provide the residual unsaturation.

Abstract: Aqueous-based sealant composition comprising at least one vinylidene chloride copolymer which has modal molecular weight Mp of at least 200,000, wherein the composition has Tg below 0.degree. C. The vinylidene chloride copolymer preferably includes polymerized units of an internally plasticizing comonomer and an unsaturated carboxylic acid. The composition preferably includes an external plasticizer and a filler material (particularly untreated calcium carbonate).

Abstract: Aqueous latex contact-adhesive compositions comprising at least one vinylidene chloride copolymer comprising polymerized units of vinylidene chloride and at least one internally plasticizing comonomer which may be provided at least in part by at least one alkyl (meth)acrylate having 1 to 12 carbon atoms in the alkyl group (preferably n-butyl acrylate), said copolymer having a modal molecular weight Mp within the range 100,000 to 700,000 and Tg within the range -50.degree. to 10.degree. C., said composition providing contactable layers after drying. The composition preferably includes a tackifying resin.

Abstract: Aqueous latex compositions for use as contact adhesives comprising a mixture of an amorphous copolymer A and an amorphous copolymer B and preferably a tackifying resin where A comprises units of vinylidene chloride, an internally plasticizing comonomer like 2-ethylhexyl acrylate or n-butyl acrylate, and optionally a copolymerizable acid, and has Tg in the range -50.degree. to <0.degree. C. and B comprises units of vinylidene chloride, an alkyl acrylate and/or methacrylate or certain other comonomers, and optionally a copolymerizable acid, and has a Tg in the range 0.degree. to 80.degree. C., and wherein copolymer A has a modal molecular weight Mp within the range 100,000 to 700,000.

Abstract: A process for recovering a chlorinated polymer of low residual solvent content, preferably less than 1% by weight, from solution in a chlorinated hydrocarbon solvent which comprises treating the solution with steam or hot water (thereby separating the chlorinated polymer in solid form) in the presence of a minor amount of both a chlorinated paraffin and an aliphatic alcohol containing at least 8 carbon atoms.

Abstract: Aqueous latex composition for use as a contact adhesive comprising a copolymer A and a copolymer B where A is an amorphous copolymer which comprises units of certain selected monomers preferably including vinylidene chloride, an internally plasticizing monomer like 2-ethylhexyl acrylate, optionally vinyl chloride, and optionally a copolymerizable acid, and has Tg within the range -50.degree. to <0.degree. C., and B is a crystalline polymer which comprises units of vinylidene chloride and preferably at least one of an alkyl acrylate, alkyl methacrylate and vinyl chloride, and optionally a copolymerizable acid, and has a Tg of not more than 30.degree. C.

Abstract: Aqueous latex composition for use as a contact adhesive comprising a mixture of an amorphous copolymer A and an amorphous copolymer B where A comprises units of vinylidene chloride, an internally plasticizing comonomer like 2-ethylhexyl acrylate or n-butyl acrylate, optionally vinyl chloride and optionally a copolymerizable acid, and has Tg in the range -50.degree. to <0.degree. C., and B comprises units of vinylidene chloride, an alkyl acrylate and/or methacrylate or certain other comonomers, optionally vinyl chloride, and optionally a copolymerizable acid, and has a Tg in the range 0.degree. to 30.degree. C.

Abstract: In the protection of ferrous substrates by application of a water-based paint composition followed by drying at ambient temperature susceptibility to flash rusting is reduced by the use of a paint composition having pH in the range from 4.0 to 6.5.

Abstract: A method of thickening an acidic aqueous coating composition comprising tannic and a latex of a film-forming polymer substantially free from non-ionic surfactants, characterized in that a water-soluble thickening agent for the aqueous latex which is noncomplexing with tannic acid is incorporated into the aqueous composition in the form of a gel-like aqueous dispersion containing evenly dispersed particles of fumed silica, said thickening agent also being compatible with the tannic acid as used in the aqueous coating composition. The thickened acidic aqueous coating composition so produced is storage stable.