Precipitated silica pigment for silicone rubber

Details Precipitated silica pigment for silicone rubber Precipitated silica pigment for silicone rubber

1982-08-11

1984-07-31

McCarthy, Helen M.

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

Synthetic resins

Processes of preparing a desired or intentional composition...

106306, 106308B, 423339, 524492, 524588, C09C 128

Patent

active

044631081

ABSTRACT:
Amorphous precipitated high structure silica pigment useful in the reinforcement of silicone rubber is described. The silica pigment is treated with an aqueous solution of a metal, e.g., calcium and barium, which forms a relatively water insoluble, white or colorless sulfate salt in amounts sufficient to provide at least an equal molar amount of the metal compared to the amount of alkali metal in the silica. Silicone rubber reinforced with such silica pigment exhibits a water swell of less than 4 volume percent.

REFERENCES:
patent: 2940830 (1960-06-01), Thornhill
patent: 3928541 (1975-12-01), Wason
patent: 3960586 (1976-06-01), Wason
patent: 4157920 (1979-06-01), Wason et al.
patent: 4159280 (1979-06-01), Wason
patent: 4202813 (1980-05-01), Wason
patent: 4244707 (1981-01-01), Wason
patent: 4280822 (1981-07-01), Wason
"Micro-Fine Silicas Handle Easily", Chemical Processing, Jan. 27, 1964, pp. 1-2.

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