David A Habermann

US Patent:

47177411, Jan 5, 1988

Filed:

May 16, 1985

Appl. No.:

6/734622

Inventors:

Jerry L. Hahnfeld - Midland MI
Alan E. Platt - Midland MI
David A. Habermann - Midland MI

Assignee:

The Dow Chemical Company - Midland MI

International Classification:

C08J 328

US Classification:

522116

Abstract:

A rubber-modified polymeric composition is disclosed. The rubber-modifying component comprises a grafted rubbery polymer, said grafted rubbery polymer being formed by a process, the steps of the process involving the formation of a hydroperoxidized rubbery polymer intermediate.

US Patent:

50753479, Dec 24, 1991

Filed:

Jan 23, 1989

Appl. No.:

7/300506

Inventors:

Alan E. Platt - Midland MI
Jerry L. Hahnfeld - Midland MI
David A. Habermann - Midland MI

Assignee:

The Dow Chemical Company - Midland MI

International Classification:

C08F 250
C08F 806
C08F27904
C08F27902

US Classification:

522 63

Abstract:

An improved process for forming hydroperoxide derivatives of rubbery polymers. The hydroperoxide derivatives being particularly well suited for use as intermediates in forming graft rubbery polymers. The process involves dissolving a rubbery polymer in a monomer mixture and adding to the rubbery polymer/monomer mixture a photosensitizing agent. The rubbery polymer-monomer mixture is then oxygenated and exposed to light under conditions wherein triplet oxygen is converted to singlet oxygen. The improvement comprises adding to the rubbery polymer/monomer mixture a solvent capable of solubilizing the photosensitizing agent in the rubbery polymer/monomer mixutre. The solubilizer increases the yield of hydroperoxide derivatives of rubbery polymers formed by a factor of 3.