C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
402/3, 402/399,
C08F 14/22 (2006.01) C08F 8/00 (2006.01) C08J 3/24 (2006.01) C08K 13/02 (2006.01)
Patent
CA 1126437
ABSTRACT OF THE DISCLOSURE Copolymers of vinylidene fluoride with at least one other fluorinated, ethylenically unsaturated monomer are press-cured at about 163-204°C by crosslinking with an aromatic polyhydroxy compound in the presence of an acceler- ator 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 tempera- ture, and under those conditions copolymer vulcanization is completed. Press-cured compositions of this invention have excellent hot tensile elongation, which permits easy demold- ability; and very good recyclability, which eliminates or reduces fluoropolymer waste. The compositions of this inven- tion also have excellent mold flow properties at press-cure temperature.
314930
Arhart Richard J.
Nersasian Arthur
E. I. Du Pont de Nemours And Company
Mccallum Brooks & Co.
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