Fast curing vulcanizable multi-part elastomer composition,...

Details Fast curing vulcanizable multi-part elastomer composition,... Fast curing vulcanizable multi-part elastomer composition,...

2011-08-02

2011-08-02

Del Sole, Joseph S (Department: 1743)

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Shaping against forming surface

C425S543000

Reexamination Certificate

active

07988903

ABSTRACT:
A multi-part rubber compound comprising:(1) a first compound comprising an elastomer (1)(a) and a vulcanizing agent, and having a ts2 of at least 1.5 minutes;(2) a second compound comprising an elastomer (2)(a) and a cure accelerator, and having a ts2 of at least 1.5 minutes; and(3) one or more optional compound comprising an elastomer (3)(a) and having a ts2 of at least 1.5 minutes;wherein:at least one of (1)(a), (2)(a) and (3)(a) has a Mooney viscosity of 20-75 measured at 100° C. (ASTM D1646),the first, second and optional compounds are kept separate until the multi-part compound is used,a blend of equal volumes of the first and second compounds, optionally with an equal volume of the optional compound, has a ts2 of less than 0.7 minutes,ts2 being measured at 190° C. (ASTM D2084),and a process for blending, injection molding and curing a rubber compound by injecting combined streams of rubber compounds from an injection chamber at a pressure of at least 10,000 psi into a motionless mixer provided downstream.

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