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Siloxane-modified epoxy resin composition

  • US 4,283,513 A
  • Filed: 03/03/1980
  • Issued: 08/11/1981
  • Est. Priority Date: 03/03/1980
  • Status: Expired due to Term
First Claim
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1. A siloxane-modified epoxy resin composition consisting essentially of (A) 100 parts by weight of a siloxane-modified epoxy resin prepared by reacting (1) 5 to 70 parts by weight of an alkylphenylpolysiloxane of the general unit formula ##EQU4## wherein each R is an alkyl or a phenyl radical such that the ratio of alkyl radicals to phenyl radicals in the alkylphenylpolysiloxane is 0.3 to 3.0, X is an alkoxy radical or a hydroxyl radical, a is 0.9 to 1.8, and b is 0.01 to 2 with (2) 95 to 30 parts by weight of an epoxy resin having at least two epoxy groups per molecule, (B) 0.01 to 30 parts by weight of an alkoxy group containing organopolysiloxane of the general unit formula ##EQU5## wherein R'"'"' is selected from the group consisting of monovalent hydrocarbon radicals and halogen substituted monovalent hydrocarbon radicals, R2 is an alkyl radical, c is 0.9 to 1.8 and d is 0.01 to 2 and (C) a curing agent for (A).

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