Donald A Holmer

US Patent:

41137086, Sep 12, 1978

Filed:

Jan 14, 1977

Appl. No.:

5/759313

Inventors:

Richard D. Chapman - Pensacola FL
Donald A. Holmer - Pensacola FL
George A. Mortimer - Pensacola FL

Assignee:

Monsanto Company - St. Louis MO

International Classification:

C08G 6928

US Classification:

528313

Abstract:

An improvement in the process for preparing random copolyamides by the melt polymerization of a mixture of hexamethylenediammonium terephthalate and hexamethylenediammonium isophthalate is described. The improvement comprises accomplishing the melt polymerization in the presence of a small amount of a certain phosphorus compound, such as benzene phosphinic acid, whereby ammonia formation during polymerization is reduced.

US Patent:

43035779, Dec 1, 1981

Filed:

Nov 16, 1979

Appl. No.:

6/095865

Inventors:

James S. Ridgway - Pensacola FL
Donald A. Holmer - Pensacola FL
Oscar A. Pickett - Pensacola FL

Assignee:

Monsanto Company - St. Louis MO

International Classification:

C08K 542

US Classification:

260 4575C

Abstract:

Novel compounds produced by reacting 5-sulfoisophthalic acid or a salt thereof (e. g. the potassium salt) with a water soluble copper salt (e. g. cupric acetate monohydrate) are described. The compounds are effective antiozonants for polyamide fibers, particularly, when the fibers are dyed with disperse dyes. Generally, sufficient amounts of the compounds are incorporated into the fibers to provide from 10 to 100 ppm, on weight of fiber, of copper.

US Patent:

40227561, May 10, 1977

Filed:

Apr 9, 1975

Appl. No.:

5/566551

Inventors:

Richard D. Chapman - Pensacola FL
Donald A. Holmer - Pensacola FL
Oscar A. Pickett - Pensacola FL
James H. Saunders - Pensacola FL

Assignee:

Monsanto Company - St. Louis MO

International Classification:

C08G 6926

US Classification:

260 78R

Abstract:

Dimensionally stable fibers are produced from copolymers prepared from substantially equimolar amounts of hexamethylene diamine and a 50:50 to 80:20 mixture of terephthalic and isophthalic acids by heating essentially amorphous fibers melt spun from the copolymers to a temperature between about 160. degree. C. and 300. degree. C. for a short period of time. The dimensionally stable fibers combine many of the best properties of nylon 66 and poly(ethylene terephthalate) and are particularly useful in tire and textile applications.

US Patent:

39417557, Mar 2, 1976

Filed:

Nov 15, 1974

Appl. No.:

5/524165

Inventors:

Richard D. Chapman - Pensacola FL
Donald A. Holmer - Pensacola FL
Oscar A. Pickett - Pensacola FL
James H. Saunders - Pensacola FL

Assignee:

Monsanto Company - St. Louis MO

International Classification:

C08G 6926

US Classification:

260 78R

Abstract:

Copolymers made from hexamethylenediamine and a mixture of tere- and isophthalic acids in which the mixture contains between about 60 and 80 mole percent terephthalic acid are described as well as useful fibers prepared therefrom.

US Patent:

42386039, Dec 9, 1980

Filed:

May 19, 1977

Appl. No.:

5/798502

Inventors:

Richard D. Chapman - Pensacola FL
Donald A. Holmer - Pensacola FL
Oscar A. Pickett - Pensacola FL
James H. Saunders - Pensacola FL

Assignee:

Monsanto Company - St. Louis MO

International Classification:

C08G 6926

US Classification:

528339

Abstract:

Fiber-forming polymers are prepared from a mixture of the hexamethylene diamine salts of terephthalic acid, isophthalic acid, and a small amount of at least one aliphatic dibasic acid (e. g. adipic acid) having from 5 to 12 carbon atoms. The polymers can be prepared in a batch autoclave and extruded therefrom without cleaning the autoclave between successive runs.