Method of making a foundation polydiorganosiloxane-silica mixtur

Details Method of making a foundation polydiorganosiloxane-silica mixtur Method of making a foundation polydiorganosiloxane-silica mixtur

1995-11-29

1997-10-21

Dean, Karen A.

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

Synthetic resins

Processes of preparing a desired or intentional composition...

524588, 524847, 524860, 524863, 524862, 427213, C08L 8304

Patent

active

056797265

ABSTRACT:
A process of making a polydiorganosiloxane-silica foundation mixture from a free-flowing, powdered, surface-modified, reinforcing silica-polydiorganosiloxane concentrate used to make, for example, RTV silicone sealant compositions which have non-sag properties. The foundation mixtures are made by combining, mixing, and heating a reinforcing silica filler and a diol surface modifying agent to a temperature of 20.degree. C. to <180.degree. C. using 0.05 to 0.5 parts by weight of the diol per one part by weight of the silica. Polydiorganosiloxane is added gradually to the resulting fluidized filler over a time period of less than 10 minutes to obtain the free flowing powdered reinforcing silica-polydiorganosiloxane concentrate. The foundation mixture is obtained by massing the concentrate and adding more polydiorganosiloxane to obtain a mixture which has from 5 to 20 weight percent silica filler. The foundation mixtures have a plateau stress of >700 dynes/cm.sup.2 and a shear-thinned viscosity of no more than 1,000 Pa.s at a shear stress of 50,000 dynes/cm.sup.2. RTV silicone sealant compositions can be obtained in 10 to 15 minutes from the start of making the surface modified silica filler to the complete sealant composition.

REFERENCES:
patent: 2890188 (1959-06-01), Konkle et al.
patent: 5153238 (1992-10-01), Bilgrien et al.
patent: 5391594 (1995-02-01), Romensko et al.
patent: 5412014 (1995-05-01), Romenesko

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