Methods for the preparation of liquid silicone rubber base and liquid silicone rubber composition
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United States of America Patent
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Feb 16, 1999
Grant Date -
N/A
app pub date -
Dec 5, 1997
filing date -
Dec 9, 1996
priority date (Note) -
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Abstract
A liquid silicone rubber base is prepared by mixing an organopolysiloxane containing at least two alkenyl groups, reinforcing silica having a BET specific surface area of at least 50 m.sup.2 /g, and optionally, a mixing assistant. The mixing step includes a first stage of mixing under a first shear stress of at least 1.times.10.sup.6 N/m.sup.2 for 1-5 minutes and a second stage of mixing under a second shear stress which is up to 1/2 of the first shear stress for at least 2 minutes. The silicone rubber base is sufficiently shelf stable to minimize a viscosity rise with time.
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