Grafted, thermoplastic, waterborne polymer and coating composition
AssigneePPG Industries, Inc.
InventorsRudolf Maska, Marvin T. Tetenbaum, James R. Bodwell, David C. Kapp
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Abstract
A water reducible resin for use in a coating composition is produced by grafting in organic solvent a thermoplastic polymer onto a thermosetting polymer that has been copolymerized with acid group-containing monomers to render the resultant polymer water soluble. Thermoplastic polymer is also grafted onto a phosphatized polyepoxide for the sake of adhesion of a coating to a substrate. A film formed from a waterborne coating composition containing the grafted polymers as a binder has both the toughness properties characteristic of a thermoplastic and the flexibility properties of a thermosetting resin.
Claims11
A resin adapted for use in a waterborne coating composition comprising a mixture of:
- (a) a thermosetting polymer having at least 5 percent by weight acid groups, and
- (b) a phosphatized epoxy polymer;
- both of which have grafted thereon a polymeric segment that is essentially thermoplastic in nature in that it is essentially free of thermosetting curing sites.
Dependencies are inferred from the claim text.