Non-crystalline acetal copolymer elastomers
US5041505A · kind A · utility
3Cited by
7References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 13, 1989 |
| Grant date | Aug 20, 1991 |
| Priority date | — |
| Expiry date | Sep 13, 2009 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L59/00
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.