Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
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.
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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.
Krivak Thomas G.
Tultz Joseph P.
Wagner Melvin P.
McCarthy Helen M.
PPG Industries Inc.
Stein Irwin M.
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