Patent ID: 6344520
Filing Date: 2002-02-05
Classification: C08G,C09D

Abstract:
An epoxy-functional organopolysiloxane coating composition comprising:a hardener; an epoxy-functional organopolysiloxane resin which contains at least one or more repeating units having the formulae: EaRb1Rc2SiOÂ½â€ƒâ€ƒ(M units) EaRb1Rc2SiO{fraction (2/2)}â€ƒâ€ƒ(D units) EaRb1Rc2SiO{fraction (3/2)}â€ƒâ€ƒ(T units) SiO{fraction (4/2)}â€ƒâ€ƒ(Q units) whereinE an epoxy-functional C1-18 hydrocarbon group containing one or more oxygen atoms, provided that no oxygen atom is directly bonded to a S- atom; and R1 and R2 are independently a C1-20 hydrocarbon, optionally interspersed with a heteroatom linking group; a is an integer of 0, 1, or 2; b is an integer of 0, 1, 2 or 3; c is an integer of 0, 1, 2 or 3; and in M units, a+b+c=3, in D units, a+b+c=2, in T units, a+b+c=1, whereinthe M units are present in less than about 40 mole percent; the D units are present in an amount of up to about 40 mole percent; with the proviso that the molecule, on average, contains at least two E components; and an acrylic resin; wherein the resin is a liquid having a molecular weight of about 500 to about 5000.