Tire curing bladder coating composition

Claim 1

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° 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° 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° C. to about 95° C., until the mixture thickens and (ii) mixing therewith under high shear mixing conditions said polydimethylsiloxanes, surfactant and polyalklene glycol.

Claim 8

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° C. to about 95° 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° 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° 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.

Claim 9

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° C. to about 95° 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° 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° 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.