Coating for silicone gaskets to reduce coefficient of friction

• US 6,296,907 B1
• Filed: 05/31/1996
• Issued: 10/02/2001
• Est. Priority Date: 05/31/1996
• Status: Expired due to Fees

• Current Assignee: Wacker Silicones Corporation
• Original Assignee: Wacker Silicones Corporation
• Inventors: Viksne, George J.
• Primary Examiner(s): CAMERON, ERMA C
• Application Number:
  US08/656,681
• Time in Patent Office: 1,950 Days
• Field of Search: 427/387, 427/393.5
• US Class Current: 427/387
• CPC Class Codes: C08L 2666/04 Macromolecular compounds according to groups C08L7/00 - C08L49/00, or C08L55/00 - C08L57/00; Derivatives thereof
• CPC Class Codes: C08L 2666/54 Inorganic substances
• CPC Class Codes: C09D 183/04 Polysiloxanes
• CPC Class Codes: F16J 15/324 Arrangements for lubrication or cooling of the sealing itself

Abstract

The present invention relates to a method of reducing the coefficient of friction of gaskets. The method comprises coating the gasket with a curable silicone composition. The composition contains a curable silicone resin, a catalyst, at least one lubricating filler not soluble in the coating composition and optionally a solvent.

Claims

1. A method for reducing the coefficient of friction of a gasket subject to lateral forces, comprising;

A. applying to said gasket a curable silicone coating composition comprising,

i a curable silicone resin

ii a catalyst

iii at least one lubricating filler not soluble in the coating composition, and

iv optionally a solvent and

B. curing the silicone coating composition.

2. A method as claimed in claim 1, wherein the curable silicone resin is an alkoxy functional methylpolysiloxane.

3. A method as claimed in claim 1, where the lubricating filler is a tetrafluoroethylene-ethylene copolymer, talc, tetrafluoroethylene, molybdenum disulfide or graphite.

4. A method as claimed in claim 1, where the lubricating filler is a mixture of a tetrafluoroethylene-ethylene copolymer and a talc treated with a hyroxyl terminated siloxane.

5. A method as claimed in claim 1, wherein the talc is treated with a hydroxyl terminated siloxane.

6. A method as claimed in claim 1, where the gasket is a silicone rubber.

7. A method for reducing the coefficient of friction of a gasket subject to lateral forces comprising;

A. applying to the gasket a curable silicone coating composition comprising;

a 10 weight percent dispersion in mineral oil of a 50;

25;

25 weight ratio of

i a 97;

3 weight ratio of an alkoxy functional methylpolysiloxane and aluminum acetylacetonate,

ii a tetrafluoroethylene-ethylene copolymer, and

iii a talc treated at elevated temperatures with a hydroxyl terminated siloxane in a 25;

1 talc to siloxane weight ratio, and

B. curing the composition applied to the gasket.