Vulcanizable non-crystalline acetal elastomers

Details Vulcanizable non-crystalline acetal elastomers Vulcanizable non-crystalline acetal elastomers

1991-01-02

1992-11-24

McCamish, Marion E.

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

Synthetic resins

Compositions to be polymerized by wave energy wherein said...

522142, 525398, 525410, 528392, 528403, C08F 246, C08G 6516, C08L 5902

Patent

active

051662248

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.

REFERENCES:
patent: 4758608 (1988-07-01), Collins et al.
patent: 5041505 (1991-08-01), Collins et al.

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