Vulcanizable flouroelastomer composition

Details Vulcanizable flouroelastomer composition Vulcanizable flouroelastomer composition

2005-03-22

2005-03-22

Cheung, William K. (Department: 1713)

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

C526S217000, C526S227000, C526S253000, C526S254000, C526S255000

Reexamination Certificate

active

06870018

ABSTRACT:
A vulcanizable fluorine-containing elastomer composition having excellent stability in molding and kneading property, from which a vulcanized article having a small compression set can be produced in a short period of time. The vulcanizable fluorine-containing elastomer composition comprises a vulcanization agent, a vulcanization aid and a fluorine-containing elastomer having C—H bond in its polymer chain, and an optimum vulcanization time T90(min) of the composition and a compression set CS (%) of the vulcanized article satisfy the following equations (I) and (II):Equation (I): in case of 50,000≦MW≦200,000,in-line-formulae description="In-line Formulae" end="lead"?CS≦−3.45 Ln(T90)+22.8−4×10−5×MWin-line-formulae description="In-line Formulae" end="tail"?Equation (II): in case of 200,000<MW,in-line-formulae description="In-line Formulae" end="lead"?CS≦−3.45 Ln(T90)+14.8.in-line-formulae description="In-line Formulae" end="tail"?

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