Non-crystalline acetal copolymer elastomers

Details Non-crystalline acetal copolymer elastomers Non-crystalline acetal copolymer elastomers

1989-09-13

1991-08-20

Nielsen, Earl

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

528403, C08G 6516, C08L 5902

Patent

active

050415050

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.

REFERENCES:
patent: 3393157 (1968-07-01), Janssen et al.
patent: 3422035 (1969-01-01), May et al.
patent: 3480590 (1969-11-01), May et al.
patent: 3595812 (1971-07-01), Boulton
patent: 3652465 (1972-03-01), Takakura
patent: 4788258 (1988-11-01), Collins et al.
patent: 4898925 (1990-02-01), Collins et al.
Chemical Abstracts 106, 138960b (1987).
Chemical Abstracts 105, 227397v (1986).

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