Appeal 2007-1895
Application 10/719,489
Claim 1 illustrates Appellants’ invention of an integrated process for
compounding a catalyst containing silicone rubber composition, and is
representative of the claims on appeal:
1. An integrated process for compounding a catalyst containing
silicone rubber composition comprising the steps of
A) blending a composition comprising:
i) 100 parts by weight of a high consistency polydiorganosiloxane,
ii) about 10 to 80 parts by weight of a treated or untreated
reinforcing silica filler,
and when said reinforcing filler is untreated
iii) about 10 to 45 weight percent, based on the weight of the
reinforcing silica filler, of a treating agent for the reinforcing silica
filler
by introducing the filler into a mixer (1) and maintaining said filler in a
highly turbulent, fluidized state at a temperature of from about 80°C to about
350°C, maintaining the temperature and the filler in the highly turbulent
fluidized state while introducing the polydiorganosiloxane and subjecting
the resulting mixture to a shearing force sufficient to achieve an average
particle size of from 1 to 1000 microns thereby forming a flowable
organopolysiloxane powder composition, and when required, introducing
said treating agent into the mixer (1) prior to, during, or after addition of the
polydiorganosiloxane,
B) directly transferring the flowable organopolysiloxane powder
composition to a bulk solids cooling device (7) and facilitating accelerated
bulk cooling thereof to a temperature below a temperature selected from the
group consisting of (i) the decomposition temperature and (ii) the activation
temperature of a catalyst added in step (D),
C) feeding the bulk cooled flowable organopolysiloxane powder
composition to a massing apparatus (8) and massing the organopolysiloxane
composition therein at a temperature selected from the group consisting of
(i) below the decomposition temperature and (ii) the activation temperature
of a catalyst added in step (D),
2
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