Yong Cheng Zheng

US Patent:

50047981, Apr 2, 1991

Filed:

May 12, 1989

Appl. No.:

7/350799

Inventors:

Jerry A. Broussard - Summit NJ
Andrew B. Auerbach - Livingston NJ
Nan L. Yang - Staten Island NY
James L. Paul - Summit NJ
Yong C. Zheng - New York NY
Chong L. Zhang - Staten Island NY

Assignee:

Hoechst Celanese Corporation - Somerville NJ

International Classification:

C08G 400

US Classification:

528230

Abstract:

Cationic copolymerization of trioxane and trimethylolpropane (TMP) formal or its ester derivatives yields acetal copolymers having pendant functional groups. The TMP formal or ester derivatives of TMP formal may therefore include functional groups selected from hydroxyl or ester moieties which are protected and thus survive the copolymerization with trioxane. These groups may then be present as functional reactive sites for the subsequent synthesis of block copolymers and/or to chemically bind modifiers to the acetal copolymer backbone, for example.

US Patent:

50344994, Jul 23, 1991

Filed:

Apr 13, 1988

Appl. No.:

7/181233

Inventors:

Andrew Auerbach - Livingston NJ
James L. Paul - Summit NJ
Yong C. Zheng - New York NY
Shian S. Wang - New York NY

Assignee:

Hoechst Celanese Corp. - Short Hills NJ

International Classification:

C08G 222

US Classification:

528250

Abstract:

Acetal copolymers of trioxane with epoxy functional groups are obtained by copolymerizing trioxane with 5,6-epoxy-1,3-dioxepane. The epoxide group in the polymer chain provides a highly reacting functional group for further modification. Acetal copolymers with backbone epoxide groups exhibit toughness and thermal stability. The backbone epoxide groups can also be aminated in a one step hydrolysis-amination process.