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US 4,070,329 AGranted
Siloxane elastomer prepared from mercaptoorg anopolysiloxanes
AssigneeDow Corning Corporation
InventorsGary R. Homan, Chi-Long Lee
Life of this patent
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Abstract
Mixing mercaptoorganopolysiloxanes, organic peroxide and optionally a filler provides a composition which cures to an elastomer either at room temperature or by heating. The elastomers have tack free surfaces and are useful as sealants and rubber articles.
Claims2
A composition curable to an elastomer comprising a material prepared by mixing
- A. a mercaptoorganopolysiloxane consisting essentially of a combination of units selected from dimethylsiloxane units, trimethylsiloxane units, units of the formula ##STR11## units of the formula ##STR12## units of the formula ##STR13## units of the formula ##STR14## units of the formula ##STR15## and units of the formula ##STR16## wherein R is a monovalent radical selected from the group consisting of alkyl radicals of from 1 to 3 carbon atoms inclusive and phenyl radicals, R' is methyl or ethyl and n has a value of from 1 to 4 inclusive, there being in said mercaptoorganopolysiloxane an average of at least two sulfur containing siloxane units per molecule and no more than 10 mol percent --SH containing siloxane units based on the total number of siloxane units in the mercaptoorganopolysiloxane, there being at least 10 siloxane units per molecule in said mercaptoorganopolysiloxane,
- B. an organic peroxide in an amount of from 1 to 6 parts by weight based on 100 parts by weight of (A), and
- C. a filler in an amount of from 0 to 100 parts by weight per 100 parts by weight of (A).
Dependencies are inferred from the claim text.