Patent ID: 6713586
Filing Date: 2004-03-30
Classification: C08G,C09D

Abstract:
A high weather and chemical resistant, addition-crosslinkable, epoxy-functional organopolysiloxane resin which contains at least one or more of the repeating units having the formulae: Ea&it;Rb1&it;Rc2&it;SiO22(D&it;â€ƒ&it;units)Ea&it;Rb1&it;Rc2&it;SiO32(T&it;â€ƒ&it;units)whereinR1 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 D units are present in an amount at about 30 mole percent; the T units are present in an amount of about 70 mole percent; the molecule, on average, contains at least two E components; and the epoxy-functional organopolysiloxane resin has an epoxy equivalent weight in the range of about 200-600, the epoxy functional organopolysiloxane resin has a viscosity in the range of about 200-70,000 cps at 25Â° C. and the E is glycidoxypropyl