C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
C08G 77/18 (2006.01) C08G 77/14 (2006.01) C09D 183/06 (2006.01)
Patent
CA 2310283
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: (see formula I) wherein E is an epoxy-functional C1-18 hydrocarbon group containing one or more oxygen atoms, provided that no oxygen atom is directly bonded to a Si- 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, 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. The epoxy-functional organopolysiloxane coating composition comprises the epoxy-functional organopolysiloxane resin of the present invention and a hardener. Preferably, the hardener is an amine hardener. The epoxy-functional organopolysiloxane coating composition may optionally include pigments, a flow additive and a catalyst. The epoxy-functional organopolysiloxane resin is preferably prepared by reacting a silicone resin with a silane having at least one epoxy group per molecule. The coating composition cures through the crosslinking of the epoxy groups in the E group of the resin to provide a coating which is weather and corrosion resistant. The polysiloxane moieties in the resin render the cured coating resistant to U.V. light and heat.
Bereskin & Parr Llp/s.e.n.c.r.l.,s.r.l.
Wacker Silicones Corporation
LandOfFree
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