Scorch-resistant, curable fluorinated elastomer

Details Scorch-resistant, curable fluorinated elastomer Scorch-resistant, curable fluorinated elastomer

1987-02-13

1988-08-09

Seccuro, Carman J.

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

Synthetic resins

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

525291, 525348, 5253263, C08L 2722

Patent

active

047628910

ABSTRACT:
A scorch-resistant, curable, fluorinated elastomer gum composition is provided. A free-radically curable, fluorinated elastomer gum is compounded with an aliphatically unsaturated, diorganosulfur compound in which at least one of the organo moieties contains a .beta.,.gamma.-aliphatically unsaturated moiety having at least one hydrogen atom bonded to the .alpha. carbon atom of said moiety, said carbon atom being bonded to a sulfur atom of the compound. The diorganosulfur compound reduces the tendency of the compounded fluorinated elastomer gum to scorch, i.e. begin curing prematurely, in the presence of a free-radical curing agent during compounding and shaping of the gum at elevated temperatures below the intended cure temperature. Specific examples of said compounds include 2,5-dihydrothiophene-1,1-dioxide, 2,5-dihydrothiophene-1-oxide, and diallylsulfide. Methods of compounding a fluorinated elastomer gum composition and of shaping and curing such a composition to obtain a fluorinated elastomeric article are also provided.

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