Addition-crosslinkable epoxy-functional organopolysiloxane polymer and coating compositions
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United States of America Patent
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Feb 5, 2002
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app pub date -
Jun 24, 1999
filing date -
Jun 24, 1999
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Abstract
The present invention pertains to an epoxy-functional organopolysiloxane resin, and an epoxy-functional organopolysiloxane coating composition comprising the epoxy-functional organopolysiloxane resin. The epoxy-functional organopolysiloxane resin which contains repeating units having the formulae: E.sub.a R.sub.b.sup.1 R.sub.c.sup.2 SiO.sub.1/2 (M units) E.sub.a R.sub.b.sup.1 R.sub.c.sup.2 SiO.sub.2/2 (D units) E.sub.a R.sub.b.sup.1 R.sub.c.sup.2 SiO.sub.3/2 (T units) SiO.sub.4/2 (Q units) wherein E is an epoxy-functional C.sub.1-18 hydrocarbon group containing one or more oxygen atoms, provided that no oxygen atom is directly bonded to a Si- atom; and R.sup.1 and R.sup.2 are independently a C.sub.1-20 hydrocarbon, optionally interspersed with a heteroatom linking group, a is an integer of 0, 1, or 2, preferably 0 or 1; b is an integer of 0, 1, 2 or 3, preferably 0, 1, or 2; c is an integer of 0, 1, 2 or 3, preferably 0, 1, or 2; and in M units, a+b+c=3, in D units, a+b+c=2, in T units, a+b+c=1, with the proviso that the molecule, on average, contain at least two E components.
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