US 6,583,223 B2Granted

Coating compositions which contain a low surface tension (meth) acrylate containing block copolymer flow control agent

AssigneePPG Industries Ohio, Inc.

InventorsJonathan D. Goetz, Kurt A. Humbert, Karl F. Schimmel, Karen A. Barkac, Simion Coca, Joanne H. Smith

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Abstract

A thermosetting composition that includes a first reactant having functional groups; a second reactant having functional groups coreactive with the functional groups of the first reactant; and a block copolymer flow control agent. The block copolymer includes a first block made up of residues of a radically polymerizable fluoroalkyl(meth)acrylate monomer, a second block made up of residues of a second radically polymerizable ethylenically unsaturated monomer, and optionally a third block made up of residues of a third radically polymerizable ethylenically unsaturated monomer. The first, second and third blocks are made of different residues from each other and the block copolymer has a polydispersity index of less than 2.5. Also disclosed is a method of coating a substrate including the steps of applying the present thermosetting composition to the substrate; coalescing the thermosetting composition to form a substantially continuous film; and curing said thermosetting composition by the application of heat.

Claims75

Dependent claims

A thermosetting coating composition comprising:

(a) a first reactant having functional groups;
(b) a second reactant having functional groups that are coreactive with the functional groups of said first reactant;
and
(c) a block copolymer flow control additive comprising:
(i) a first block comprising residues of a first radically polymerizable (meth)acrylate monomer selected from at least one monomer represented by the general formulas:
wherein R1 is selected independently for each general formula from hydrogen, methyl and ethyl;
R2 is selected independently for each general formula from the group consisting of linear, branched, cyclic, aryl and arylalkyl fluorinated hydrocarbon groups containing from 4-20 carbon atoms, a siloxane, a polysiloxane, an alkyl siloxane, an ethoxylated trimethylsilyl siloxane and a propoxylated trimethylsilyl siloxane;
Y is a divalent linking group containing from 1 to 20 carbon atoms;
m is an integer from 1 to 4;
and R3 is a C1-C4 alkyl group;
and
(ii) a second block comprising residues of a second radically polymerizable ethylenically unsaturated monomer that is free of hydroxyl groups and amine groups;
wherein said first block and said second block are different from each other, and said block copolymer is prepared by controlled radical polymerization and has a polydispersity index of less than 2.5.

10 more elements

A method of coating a substrate comprising:

(A) applying to said substrate a thermosetting composition;
(B) coalescing said thermosetting composition to form a substantially continuous film;
and
(C) curing said thermosetting composition by the application of heat, wherein said thermosetting composition comprises a co-reactable solid, particulate mixture of:
(i) a first reactant having functional groups;
(ii) a second reactant having functional groups that are coreactive with the functional groups of said first reactant;
and
(iii) a block copolymer flow control additive comprising:
(a) a first block comprising residues of a first radically polymerizable (meth)acrylate monomer selected from at least one monomer represented by the general formulas,
wherein R1 is selected independently for each general formula from hydrogen, methyl and ethyl;
R2 is selected independently for each general formula from the group consisting of linear, branched, cyclic, aryl and arylalkyl fluorinated hydrocarbon groups containing from 4-20 carbon atoms, a siloxane, a polysiloxane, an alkyl siloxane, an ethoxylated trimethylsilyl siloxane and a propoxylated trimethylsilyl siloxane;
Y is a divalent linking group containing from 1 to 20 carbon atoms;
m is an integer from 1 to 4;
and R3 is a C1-C4 alkyl group;
and
(b) a second block comprising residues of a second radically polymerizable ethylenically unsaturated monomer that is free of hydroxyl groups and amine groups;
wherein said first and second blocks are different from each other, and said block copolymer is prepared by controlled radical polymerization and has a polydispersity index of less than 2.5.

14 more elements

Dependencies are inferred from the claim text.