Powder coating compositions are disclosed which comprise a blend of coreactable, thermosettable copolymers each of which have at least two different functional groups Ordinarily, these polymers will be qualitatively difunctional, although they may contain more than two different functional groups, and quantitatively polyfunctional At least one of the copolymers has epoxy functionality as one of its two or more different functionalities Thus, in the preferred embodiments, the first copolymer of the blend has epoxy functionality and a second functionality selected from amide functionality, anhydride functionality and hydroxy functionality and is crosslinkable with the second copolymer through at least two different types of functional groups on the first copolymer The second copolymer also is crosslinkable with the first copolymer through at least two different types of functional groups on the second copolymer and may be (a) anhydride functional and carboxy functional, (b) carboxy functional and amide functional, (c) carboxy functional and hydroxy functional, (d) epoxy functional and amide functional or (e) epoxy functional and anhydride functional The second copolymer is advantageously employed in an amount such that its functionality of greatest concentration provides about 03 to about 12 functional groups per functional group on the first copolymer and the functionality of lesser concentration provides about 01 to about 04 functional groups per functional group on the first copolymer

Powder coating compositions comprising a blend of coreactive polymers - II E

A thermosetting polymer powder coating composition comprising finely divided powder particles that have a diameter of about 1-100 microns wherein the powder particles are a blend of A. an acrylic polymer of glycidyl methacrylate, an alkyl methacrylate or an alkyl acrylate having 1-12 carbon atoms in the alkyl groups, B. dodecanedioic acid, C. low viscosity cellulose acetate butyrate, D. an alkylated melamine formaldehyde crosslinking agent, and E. a blocked acid catalyst; The powder coating composition is particularly useful as an exterior finish for automobile and truck bodies.

Thermosetting powder coating composition of an acrylic polymer, dodecanedioic acid, cellulose acetate butyrate and a cross-linking agent

A thermosetting composition is provided comprising: (a) a cross-linking agent having at least two functional groups that are reactive with epoxides; and (b) a non-gelled, epoxy functional polymer prepared by atom transfer radical polymerization, in the presence of an initiator having at least one radically transferable group. The polymer contains at least one of the following polymer chain structures: -{(M)p-(G)q}x- or -{(G)q-(M)p}x- wherein M is a residue, that is free of epoxy functionality, of at least one ethylenically unsaturated radically polymerizable monomer; G is a residue, that has epoxy functionality, of at least one ethylenically unsaturated radically polymerizable monomer; p and q represent average numbers of residues occurring in a block of residues in each polymer chain structure; and p, q, and x are each independently selected for each structure such that the epoxy functional polymer has a number average molecular weight of at least 250. Also provided by the present invention are methods of coating a substrate using compositions of the present invention and substrates coated by such methods, as well as color-plus-clear composite coatings.

Thermosetting compositions containing hydroxyl-functional polymers prepared using atom transfer radical polymerization

Improved powder paint compositions are disclosed which comprise a particulate mixture of (1) a qualitatively difunctional copolymer of about 5 to about 20 weight percent of a glycidyl ester of a monoethylenically unsaturated acid, about 2 to about 10 weight percent of C 5 - C 7 hydroxyalkyl acrylates and/or C 5 - C 7 hydroxyalkyl methacrylates, and about 70 to about 93 weight percent monoethylenically unsaturated monomers consisting essentially of monofunctional monomers selected from the group consisting of esters of a C 1 - C 8 monohydric alcohol and acrylic acid, esters of a C 1 - C 8 monohydric alcohol and methacrylic acid and C 8 - C 12 monovinyl hydrocarbons, (2) a C 4 - C 20 saturated, straight chain, aliphatic dicarboxylic acid which is present in an amount that provides about 0.1 to about 0.6 carboxyl group per functional group on said copolymer, and (3) a polyanhydride, i.e., a homopolymer of a monomeric anhydride of a dicarboxylic acid, having molecular weight in the range of about 1000 to about 5000 which is present in an amount that provides about 0.2 to about 1.1 anhydride groups per epoxy group on said copolymer.

Powder paint with epoxy and hydroxy copolymer and mixture of dicarboxylic acids and polyanhydrides

Compositions(I), (II) and (III) comprising compounds having vinyl groups as side chains and epoxidized compositions(XI), (XII) and (XIII) thereof, which can be prepared by the various reaction combinations of (a) with (b) or (b)+(c), and or (d), are disclosed. (a) is at least one compound having at least one vinyl group and one epoxy group in the molecule; (b) is at least one of a polybasic compound, an anhydride thereof, a polymer having carboxylic groups at terminals and a polymer having carboxylic groups as side chains; (c) is at least one organic compound having at least one active hydrogen atom; and (d) is at least one of an unsaturated monocarboxylic compound or an unsaturated monocarboxylic ester having a hydroxyl group. Heat curable compositions and epoxy resin compositions can be made which comprise the above-mentioned compositions and a radical initiator or a curing agent, a polymer composition obtained by radically (co)polymerizing the compositions(III) or the epoxidized compositions(XIII) thereof. The epoxidized compositions(XI) and (XII) can provide a coating layer or a formed article having excellent properties such as heat resistance, outdoor durability and further electric properties.

Compositions, expoxidized compositions, a heat-curable resin composition, an epoxy resin composition, radically polymerized composition, a curable resin composition and a polymer having epoxy groups

A thermosetting acrylic powder coating composition which comprises an acrylic resin having glycidyl groups in the molecule and a glass transition temperature of 40degree to 85degreeC and at least one of aliphatic dibasic acids, anhydrides thereof and substances producing said dibasic acids under a curing condition; said acrylic resin being a copolymer of 1 50 to 945 weight percent of at least one alkyl esters of acrylic acid or methacrylic acid, 2 05 to 10 weight percent of at least one of hydroxyalkyl esters of acrylic acid or methacrylic acid and 3 5 to 40 weight percent of at least one of glycidyl acrylate and glycidyl methacrylate; and said aliphatic dibasic acid having the formula of in which R is a saturated aliphatic hydrocarbon group having 4 to 11 carbon atoms

Masaaki Kamimura

Papers

Powder coating compositions