Methods for the preparation of liquid silicone rubber base and l

Details Methods for the preparation of liquid silicone rubber base and l Methods for the preparation of liquid silicone rubber base and l

1997-12-05

1999-02-16

Marquis, Melvyn I.

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

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

528502F, 528 15, 528 32, 524588, 525478, 525479, C08K 334

Patent

active

058721720

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.

REFERENCES:
patent: 4528311 (1985-07-01), Beard et al.
patent: 4851173 (1989-07-01), Mackley et al.
patent: 5051129 (1991-09-01), Cuthbert et al.
patent: 5480722 (1996-01-01), Tomonaga et al.
patent: 5629400 (1997-05-01), Standke et al.
patent: 5679147 (1997-10-01), Standke et al.
JP-A 63270763 (English abstract) (Nov. 8, 1988).
JP-A 61130344 (English abstract) (Jun. 18, 1986).

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