Press-curable fluoropolymer compositions and process

Details Press-curable fluoropolymer compositions and process Press-curable fluoropolymer compositions and process

1977-12-27

1979-12-04

Wong, Jr., Harry

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

Synthetic resins

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

252430, 525343, 525362, 525363, 525367, 525368, 525369, 525370, 525371, 525359, 525385, 525373, 525200, 260884, C08F 800, C08F 1422

Patent

active

041772237

ABSTRACT:
Copolymers of vinylidene fluoride with at least one other fluorinated- ethylenically unsaturated monomer are press-cured at about 163.degree.-204.degree. C. by crosslinking with an aromatic polyhydroxy compound in the presence of an accelerator in a weakly basic system, at least a portion of the polyhydroxy compound being blocked by conversion to acetal or thioacetal groups. At the press-cure temperature some of the acetal or thioacetal groups are decomposed and the free hydroxyl groups are reformed, thus providing crosslinking capability. The remainder of acetal or thioacetal groups are decomposed during post-cure oven heating at a higher temperature, and under those conditions copolymer vulcanization is completed. Press-cured compositions of this invention have excellent hot tensile elongation, which permits easy demoldability; and very good recyclability, which eliminates or reduces fluoropolymer waste. The compositions of this invention also have excellent mold flow properties at press-cure temperature.

REFERENCES:
patent: 2647882 (1952-08-01), Evans et al.
patent: 3600404 (1971-08-01), Ludwig
patent: 3660331 (1972-05-01), Ludwig
patent: 3876654 (1975-04-01), Pattison
patent: 3884877 (1975-05-01), Kolb
patent: 3951913 (1976-04-01), Kometani et al.
Fieser and Fieser, Reagents for Organic Synthesis, John Wiley & Sons (1968), pp. 256-257.

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