Elastic fluorohydrocarbon resin and method of producing same

Details Elastic fluorohydrocarbon resin and method of producing same Elastic fluorohydrocarbon resin and method of producing same

1996-02-28

1997-12-09

Schofer, Joseph L.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

525276, C08F 200, C08F25900

Patent

active

056962150

ABSTRACT:
The invention relates to an elastic fluorohydrocarbon resin. This resin is obtained by graft copolymerization of a first segment which is one of fluorine-containing elastomeric and crystalline polymers with a second segment which is the other of these polymers. The first segment is prepared by copolymerizing at least one first unsaturated monomer that has peroxy bond with at least one second fluorine-containing monomer. When the first monomer is dissolved in a first solvent prior to the copolymerization, the copolymerization can be safely conducted with higher yield. This first solvent is selected from a carboxylic ester of t-butanol, methylene chloride, 1,1,1-trichloroethane, and first, second, third and fourth compounds which are respectively represented by R.sup.1 COOR.sup.2, C.sub.2 H.sub.x Cl.sub.y F.sub.z, C.sub.3 H.sub.x Cl.sub.y F.sub.z, and C.sub.4 H.sub.x Cl.sub.y F.sub.z. When the fluorine-containing elastomeric copolymer as the first segment is purified by contact with a barium salt prior to the graft copolymerization, the elastic fluorohydrocarbon resin becomes improved in thermal stability. When the fluorine-containing elastomeric copolymer having a water content of 0.1-50 wt % as the first segment is dispersed in a liquid medium containing t-butanol and water, it becomes unnecessary to dry this elastomeric copolymer prior to the graft copolymerization. When the fluorine-containing elastomeric copolymer as the first segment is dispersed in another liquid medium containing t-butanol, water, a carboxylic ester and barium hydroxide, the elastic fluorohydrocarbon resin becomes improved in thermal stability with higher graft copolymerization rate.

REFERENCES:
patent: 4472557 (1984-09-01), Kawashima et al.
patent: 5182342 (1993-01-01), Feiring et al.
patent: 5473030 (1995-12-01), Arcella et al.
Abstract, "Manufacture of Flexible Fluoropolymers With Good Processability", Yasumura et al., JP 03269008 A2 911129 Heisei.
Abstract, "Manufacture of Flexible Fluorine-Containing Polymers With Improved Thermal Stability", Ishihara et al., JP 05194625 A2 930803 Heisei.
In-House Computer-Generated Doc. No.116:129967. Yasumura et al JP90-66624-900316 Abstract pp. 25 and 26.

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