C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
C08L 83/07 (2006.01) C08K 3/26 (2006.01) C08K 3/30 (2006.01) C08K 3/32 (2006.01) C08K 3/38 (2006.01) C08K 5/098 (2006.01) C08L 83/04 (2006.01)
Patent
CA 2268718
There is disclosed and claimed herein a heat-curable silicone rubber composition, having improved resistance to engine oils and coolants, including extended-life coolants and synthetic motor oils. Said composition comprises: (A) 100 parts by weight of an organosiloxane polymer base comprising a mixture of an organosiloxane polymer, containing at least 2 silicon-bonded alkenyl groups in each molecule and 1 to 65 weight percent of a reinforcing silica filler, (B) an amount of a curing component sufficient to cure the composition when heated, and (C) an effective amount of at least one metal salt additive selected from the group consisting of monobasic alkali metal phosphates, alkali metal oxalates, alkali metal tartrates, alkali metal tetraborates, alkali metal phthalates and alkali metal citrates; dibasic metal phosphates where the metal is selected from the group consisting of sodium, potassium, calcium and magnesium; metal acetates, where the metal is selected from the group consisting of sodium, potassium, calcium, magnesium; metal sulfates where the metal is selected from the group consisting of sodium, potassium, calcium, magnesium, aluminum and zinc; and metal carbonates where the metal is selected from the group consisting of sodium, potassium, calcium, magnesium, aluminum and zinc.
Degroot Jon Vierling Jr.
Fiedler Lawrence Dale
Schulz William James Jr.
Wright Antony Pope
Dow Corning Corporation
Gowling Lafleur Henderson Llp
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