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US 6,294,635 B1Granted
Addition-crosslinking compositions which give heat-stable silicone rubber
AssigneeWacker Chemie AG
InventorsFrank Achenbach, Herbert Barthel
Life of this patent
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Abstract
The addition-crosslinking silicone rubber compositions which crosslink to give a silicone rubber of increased heat resistance comprising a palladium-containing heat stabilizer.
Claims17
An addition-crosslinking silicone composition crosslinkable to a silicone rubber displaying increased heat resistance, comprising:
- a) an effective, heat-stabilizing amount of a palladium heat-stabilizing compound;
- b) a polyorganosiloxane having at least two alkenyl groups per molecule;
- c) a polyorganosiloxane having at least two SiH groups per molecule;
- d) a hydrosilylation catalyst;
- wherein said palladium compound a) exhibits substantially no hydrosilylation catalytic activity, and wherein the heat resistance of said silicone rubber is greater than an otherwise similar rubber not containing said palladium compound a).
2 more elements
A method of increasing the heat resistance of a silicon rubber prepared by the addition of crosslinking of polysiloxanes containing two or more alkenyl groups (1) with polysiloxanes containing two or more SiH groups, (2) in the presence of a hydrosilylation catalyst, (3) said method comprising:
- adding to one or more of (1), (2) or (3) an effective, heat-stabilizing amount of a heat-stabilizer comprising palladium or a palladium compound, wherein said palladium or said palladium compound exhibits substantially no hydrosilation catalytic activity.
Dependencies are inferred from the claim text.