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US 2001/0018488 A1Published application
Silicone molding compositions having extended useful life
AssigneeGeneral Electric Company
InventorJohn J. Fitzgerald
Life of this patent
Estimating the term…
Abstract
Silicone mold making compositions containing an olefin polymerization inhibitor have a longer useful life for making casts from curable resins comprising a polymerizable olefin.
Claims10
A silicone composition for making molds comprising an olefin or acetylene polymerization inhibitor.
A curable silicone composition for making casting molds comprising:
- (a) a di-silanol stopped linear polydimethylsiloxane having a viscosity ranging from about 10,000 to about 80,000 centipoise at 25° C.;
- (b) a finely divided filler or mixtures thereof;
- (c) a methyl stopped polydimethylsiloxane having a viscosity ranging from about 10 to about 350 centipoise at 25° C.;
- (d) a methyl stopped polydimethylsiloxane having a viscosity ranging from about 400 to about 600 centipoise at 25° C.;
- and
- (e) an olefin polymerization inhibitor.
3 more elements
A curable silicone composition for making casting molds comprising:
- (a) a silanol stopped hydrogen stopped polydimethylsiloxane having a viscosity ranging from about 10,000 to about 80,000 centipoise at 25° C.;
- (b) a fumed silica having a surface area varying from 50 to 450 m2/g;
- (c) a precipitated silica wherein said precipitated silica has been treated with hexamethyldisilazane and wherein said hexamethyldisilazane treated precipitated silica has a surface area ranging from about 50 to 175 m2/g;
- (d) a methyl stopped polydimethylsiloxane having a viscosity ranging from about 10 to 350 centipoise at 25° C.;
- (e) an olefin polymerization inhibitor.
2 more elements
A condensation cure silicone composition for making molds comprising an olefin polymerization inhibitor.
A silicone composition for making molds consisting essentially of:
- (a) a curable silicone composition, and
- (b) an olefin or acetylene polymerization inhibitor.
Dependencies are inferred from the claim text.