Brian P Devlin

US Patent:

55021131, Mar 26, 1996

Filed:

Aug 22, 1994

Appl. No.:

8/294002

Inventors:

Joseph A. Antonelli - Riverton NJ
Lee A. E. Becton - Media PA
Brian P. Devlin - Broomall PA
Christopher Scopazzi - Wilmington DE

Assignee:

E. I. Du Pont de Nemours and Company - Wilmington DE

International Classification:

C08L 3308
C08L 3312
C08L 6310
C08L 3314

US Classification:

525287

Abstract:

A pigment dispersion useful for forming aqueous coating compositions containing metallic flake pigment, an aqueous carrier and a graft copolymer dispersant (binder); wherein the graft copolymer has a weight average molecular weight of about 5,000-100,000 and comprises a polymeric backbone and macromonomer side chains attached to the backbone wherein (1) the polymeric backbone is formed of polymerized ethylenically unsaturated monomers and (2) the side chains are macromonomers that are attached to the backbone at a single terminal point and formed from polymerized ethylenically unsaturated monomers that are polymerized in the presence of a cobalt chain transfer agent have a weight average molecular weight of about 1,000-30,000; wherein the graft copolymer contains about 2 to 70% by weight, based on the weight of the graft copolymer, of polymerized constituents having a phosphate moiety and phosphoric acid moieties that are polymerized into the backbone, the side chains or both and the polymer is neutralized with an inorganic base or an amine; and the metallic flake pigment is present in a binder to pigment weight ratio of least 10/100; coating compositions containing the novel dispersion, the graft copolymer and the process for making the graft copolymer and pigment dispersions are part of the invention.

US Patent:

55300707, Jun 25, 1996

Filed:

Aug 25, 1995

Appl. No.:

8/519837

Inventors:

Joseph A. Antonelli - Riverton NJ
Lee A. E. Becton - Media PA
Brian P. Devlin - Broomall PA
Christopher Scopazzi - Wilmington DE

Assignee:

E. I. Du Pont de Nemours and Company - Wilmington DE

International Classification:

C08F 840
C08F26504
C08F26506
C08F28310

US Classification:

5253304

Abstract:

A graft copolymer dispersant (binder) having a weight average molecular weight of about 5,000-100,000 wherein: (1) the graft copolymer has a polymeric backbone formed by polymerizing ethylenically unsaturated monomers; (2) the graft copolymer has macromonomer side chains attached to the backbone at a single terminal point that have weight average molecular weights of about 1,000-30,000 and are formed from by polymerizing ethylenically unsaturated monomers in the presence of a cobalt chain transfer agent. The graft copolymer further contains about 2 to 70% by weight, based on the weight of the graft copolymer, of polymerized constituents having a phosphate moiety or phosphoric acid moleties that are polymerized into the backbone, the side chains, or both. The graft copolymer is neutralized with an inorganic base or an amine.