Susan M Hershberger

US Patent:

51514761, Sep 29, 1992

Filed:

Jul 12, 1990

Appl. No.:

7/551364

Inventors:

Richard A. Marshall - Akron OH
James W. Hershberger - Oxford OH
Susan A. Hershberger - Oxford OH

Assignee:

The Goodyear Tire & Rubber Company - Akron OH

International Classification:

C08F 216

US Classification:

526 93

Abstract:

Micro-suspension polymerization is a technique that it is widely used on a commercial basis for the polymerization of vinyl chloride monomer into polyvinyl chloride. This invention reveals a greatly improved redox initiator system for use in such polymerizations. The redox initiator systems of this invention are comprised of (a) a free radical generator, such as a peroxide, and (b) a reducing agent selected from the group consisting of ascorbic acid, isoascorbic acid, and certain derivatives of ascorbic acid. The initiator systems of this invention do not require the utilization of water-soluble metal salts. However, water-soluble metal salts can be utilized in such initiator systems in catalytic amounts wherein the ratio of the water-soluble metal salt to the free radical generator is less than 0. 09.