Perfluoropolyethers having brominated end groups and fluoroelast

Details Perfluoropolyethers having brominated end groups and fluoroelast Perfluoropolyethers having brominated end groups and fluoroelast

1990-10-30

1992-10-13

Lipman, Bernard

Organic compounds -- part of the class 532-570 series

Organic compounds

Oxygen containing

5253264, 525356, 526247, C08F 822

Patent

active

051552825

ABSTRACT:
New perfluoropolyethers comprising repeating units chosen from among ##STR1## statistically distributed along the chain, having a controlled molecular weight and brominated end groups, prepared starting from the product of the photochemical oxidation of C.sub.2 F.sub.4, and/or C.sub.3 F.sub.6, containing peroxidic oxygen, and subsequent treatment in liquid phase with bromine, at temperatures ranging from -40.degree. to 130.degree. C. in the presence of ultraviolet radiations, said new perfluoropolyethers derivatives being useful as additives in rubber mixes vulcanizable with peroxides, in amounts of 0.01 to 5 parts by w per 100 parts by weight of elastomer, optionally in combination with non brominated perfluoropolyethers, to improve the processability in the extrusion and the detachability of the vulcanized articles from the molding.

REFERENCES:
patent: 3665041 (1971-05-01), Sianesi et al.
patent: 4356291 (1982-10-01), Darling
patent: 4500739 (1985-02-01), Caporiccio et al.
patent: 4647413 (1987-03-01), Savu

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