Milton J Hayes

US Patent:

50415050, Aug 20, 1991

Filed:

Sep 13, 1989

Appl. No.:

7/406641

Inventors:

George L. Collins - Maplewood NJ
William M. Pleban - Stanhope NJ
Milton J. Hayes - Irvington NJ

Assignee:

Hoechst Celanese Corp. - Somerville NJ

International Classification:

C08G 6516
C08L 5902

US Classification:

525398

Abstract:

Copolymers of 1,3-dioxolane and 1,3-dioxepane in the form of non-crystalline high molecular weight elastomers having low glass transition temperatures (Tg) are disclosed. Such copolymers are formed by polymerizing from about 40 to about 60 mol percent of 1,3-dioxolane and correspondingly from about 60 to about 40 mol percent of 1,3-dioxepane under substantially anhydrous conditions in the presence of a cationic polymerization catalyst, e. g. , a strong Bronsted acid such as trifluoromethanesulfonic acid. Blends of such non-crystalline copolymers with crystalline oxymethylene polymers are also disclosed.

US Patent:

54120420, May 2, 1995

Filed:

Jul 25, 1991

Appl. No.:

7/735974

Inventors:

George L. Collins - Maplewood NJ
William M. Pleban - Stanhope NJ
Milton J. Hayes - Irvington NJ

Assignee:

Hoechst Celanese Corp. - Somerville NJ

International Classification:

C08L 5902

US Classification:

525403

Abstract:

A crosslinked elastomeric acetal polymer is synthesized from 1,3-dioxolane, 1,3-dioxepane, and a polyfunctional crosslinking compound having two or more functional groups that react under conditions of cationic polymerization, such as 1,4-divinyloxybutane or poly(butadiene oxide). The polymers are elastomeric and non-crystalline at temperatures well below room temperature. They can be blended with crystalline acetal polymers to produce blends that have improved impact properties.