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Silicone pressure sensitive adhesives

  • US 5,961,770 A
  • Filed: 11/16/1998
  • Issued: 10/05/1999
  • Est. Priority Date: 07/05/1996
  • Status: Expired due to Term
First Claim
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1. A method of making an article of manufacture comprising:

  • (I) applying a silicone pressure sensitive adhesive composition to at least one surface of a substrate, wherein the silicone pressure sensitive adhesive composition is obtained by a method comprising;

    (i) heating a mixture comprising;

    (A)(i) a hydroxyl-terminated polydiorganosiloxane having a viscosity of from 100 to 10,000,000 mm2 /s at 25°

    C. or(ii) a mixture of (a) a hydroxyl-terminated polydiorganosiloxane and (b) a polydiorganosiloxane selected from (i) polydiorganosiloxanes terminated with monovalent hydrocarbon radicals free of aliphatic unsaturation or (ii) alkenyl-terminated polydiorganosiloxanes wherein said mixture has a viscosity of from 100 to 10,000,000 mm2/ s at 25°

    C.;

    (B) a soluble silicone resin comprising R3 SiO1/2 siloxane units and SiO4/2 units, wherein R is selected from a monovalent hydrocarbon or halohydrocarbon radical free of aliphatic unsaturation and having from 1 to 20 carbon atoms, an alkenyl radical, or a hydroxyl radical; and

    (C) an organic amine compound selected from the group consisting of primary amines, secondary amines, and tertiary amines, or a metal salt of an organic amine compound selected from the group consisting of carboxylic acid salts of organic amines and quaternary ammonium salts to form a reaction product having a solids content of at least 70% and a viscosity of up to 200,000 millipascal-seconds at 25°

    ; and

    (ii) adding (D) an organic peroxide or azo compound to the reaction product of (i); and

    (II) heating the silicone pressure sensitive adhesive composition and the substrate to cure the composition.

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