William E Leonard

US Patent:

40283429, Jun 7, 1977

Filed:

May 29, 1975

Appl. No.:

5/581611

Inventors:

James A. Dale - Menlo Park CA
William J. Leonard - San Francisco CA

Assignee:

Dynapol Corporation - Palo Alto CA

International Classification:

A23D 504
C08F 1910

US Classification:

260 47UA

Abstract:

Polymeric phenols of the formula ##STR1## WHEREIN N IS AN INTEGER FROM 3 TO 2,000, R. sub. 1 is a lower alkyl and R. sub. 2 is hydrogen or a lower alkyl, are disclosed. Their preparation and preferred use as antioxidants, especially nonabsorbable food antioxidants, are also disclosed.

US Patent:

42607140, Apr 7, 1981

Filed:

May 18, 1979

Appl. No.:

6/040030

Inventors:

Robert E. Wingard - Palo Alto CA
William J. Leonard - San Francisco CA

Assignee:

Dynapol - Palo Alto CA

International Classification:

C08F22054

US Classification:

526271

Abstract:

Copolymers of acetamidoethylene are disclosed. These materials have randomly distributed units represented by the formula ##STR1## wherein R is one or more radicals selected from the group ##STR2## and the C. sub. 1 to C. sub. 6 carboxylic acid esters thereof, ##STR3## wherein R. sup. 1 is hydrogen or a C. sub. 1 to C. sub. 6 alkyl, and R. sup. 2 is a C. sub. 1 to C. sub. 6 alky; x and y are numbers greater than zero which total to 1. 00; the ratio of x to y from about 0. 05:0. 95 to about 0. 95:0. 05; and n is an integer from about 14 to about 10,000. The copolymers are useful as epoxy resin curing agents, as components of protective or decorative coatings, and as intermediates in the formation of vinylamine group-containing copolymers having the formulae ##STR4## wherein x, y and n are as previously defined, x' plus z equals x and R. sup. 3 is one or more of the radicals selected from the group ##STR5## wherein R. sup. 1 and R. sup. 2 are as previously defined.

US Patent:

42385792, Dec 9, 1980

Filed:

May 18, 1979

Appl. No.:

6/040359

Inventors:

William J. Leonard - San Francisco CA
Robert E. Wingard - Palo Alto CA

Assignee:

Dynapol - Palo Alto CA

International Classification:

C08F21208
C08F 812
C08F22054

US Classification:

525330

Abstract:

Vinylamine copolymers are disclosed. These copolymers have randomly distributed repeating units represented by the formula ##STR1## wherein Ar is optionally substituted phenyl, the substituents independently selected from C. sub. 1 to C. sub. 6 alkyl, C. sub. 1 to C. sub. 6 alkoxy and halo; x and y are numbers greater than zero which total 1. 0, the ratio of x to y from about 0. 05:0. 95 to about 0. 95:0. 05; and n is an integer from about 14 to about 10,000. Acid addition salts of these copolymers are also disclosed, as are vinylacetamide/aromatic hydrolysis precursors and the terpolymeric vinylamine/vinylacetamide/aromatic products of partial hydrolysis. The copolymers are useful as epoxy resin-curing agents and as components of protective or decorative coatings.