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US 4,431,452 AGranted
Tire curing bladder coating composition
AssigneeThe Goodyear Tire & Rubber Company
InventorsLouis F. Comper, Robert F. Scheiderich
Life of this patent
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Abstract
A lubricant composition for coating a tire curing bladder comprising, in aqueous medium, polydimethylsiloxanes, bentonite clay, polyalkylene glycols surfactants an optionally stabilizers, defoamers and corrosion inhibitors.
Claims7
An aqueous emulsion of a lubricant composition consisting essentially of:
- (A) about 10 to about 40 parts by weight bentonite clay having a mesh size in the range from about 100 to about 500 U.S. Standard Sieve Size;
- (B) about 15 to about 45 parts by weight polydimethylsiloxane characterized by having a viscosity in the range of about 15 million to about 25 million centistokes at 25.degree. C.;
- (C) about 15 to about 45 parts by weight polydimethylsiloxane having a viscosity in the range of about 40,000 to about 120,000 centistokes at 25.degree. C.;
- (D) about 12 to about 31 parts by weight of a polyalkylene glycol having a molecular weight in the range of about 1500 to about 2500 and selected from the group consisting of polyethylene glycol, polypropylene glycol and mixtures thereof;
- (E) about 10 to about 25 parts by weight surfactants for said polydimethylsiloxanes and polyalkylene glycol;
- (F) optionally about 4 to about 12 parts by weight stabilizer, and
- (G) about 500 to about 1500 parts by weight water;
- where said emulsion is prepared by the sequential steps of
- (i) mixing under high shear mixing conditions said clay and water, said water having a temperature in the range of about 50.degree. C. to about 95.degree. C., until the mixture thickens and
- (ii) mixing therewith under high shear mixing conditions said polydimethylsiloxanes, surfactant and polyalklene glycol.
7 more elements
A method of preparing a lubricant composition which comprises,
- (A) mixing under high shear mixing conditions about 10 to about 40 parts by weight bentonite clay having a mesh size in the range of about 100 to about 500 U.S. Standard Sieve Size with about 500 to about 1500 parts by weight water which has been preheated to a temperature in the range of about 50.degree. C. to about 95.degree. C. until the mixture thickens;
- (B) mixing therewith under high shear mixing conditions, about 15 to about 45 parts by weight of a polydimethylsiloxane characterized by having a viscosity in the range of about 15 million to about 25 million centistokes at 25.degree. C. and about 3 to about 25 parts by weight weight surfactant for said polydimethylsiloxane;
- (C) mixing therewith about 15 to about 45 parts by weight polydimethylsiloxane characterized by having a viscosity in the range of about 40,000 to about 120,000 centistokes at 25.degree. C., about 12 to about 36 parts by weight of polyalkylene glycol having a molecular weight in the range of about 1500 to about 2500 and selected from the group consisting of polyethylene glycol, polypropylene glycol and mixtures thereof, and about 4 to about 10 parts by weight surfactant for said polydimethylsiloxane and polyalkylene glycol;
- (D) optionally mixing therewith about 2 to about 10 parts by weight additional surfactant;
- (E) optionally mixing therewith about 2 to about 8 parts by weight corrosion inhibitor;
- (F) optionally mixing therewith about 0.2 to about 1.0 part by weight defoamer;
- (G) optionally mixing therewith about 2 to about 10 parts by weight stabilizer.
4 more elements
Dependencies are inferred from the claim text.