Vulcanizable non-crystalline acetal elastomers
US5166224A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 2, 1991 |
| Grant date | Nov 24, 1992 |
| Priority date | — |
| Expiry date | Jan 2, 2011 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L59/00
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Non-crystalline elastomeric acetal polymers are disclosed which have ethylenic unsaturation in the polymer backbone. The polymers are synthesized by the ring-opening polymerization of 1,3-dioxolane, 1,3-dioxepane, and the cyclic formal of an ethylenically unsaturated diol having at least 4 adjacent carbon atoms in its main chain. The preferred cyclic formal is 4,7-dihydro-1,3-dioxepin. Because of the ethylenic unsaturation, the elastomeric acetal polymers can be vulcanized or cured with multifunctional vinyl monomers to produce elastomers with improved properties, such as better elasticity, decreased thermoplasticity and decreased solubility. The elastomeric acetals in any of their embodiments are particularly useful for blending with crystalline acetal polymers to improve the impact resistance of the crystalline acetal polymers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.