Polysiloxane-modified paint binders and process for...

Details Polysiloxane-modified paint binders and process for... Polysiloxane-modified paint binders and process for...

C - Chemistry, Metallurgy

08

L

400/4112

C08L 67/00 (2006.01) C08G 63/695 (2006.01) C09D 167/00 (2006.01)

Patent

CA 1104286

300/US1490 ABSTRACT OF THE INVENTION Paint binders having an intrinsic viscosity of from 8 - 15 ml/g which are water soluble upon neutralization with bases comprising the condensation reaction product of (A) 50 - 85% by weight of a polyester resin modified with 5 - 40% by weight of a polysiloxane of the gen- eral formula Image wherein R is an alkyl, cycloalkyl, aryl or alkoxy radical, Rl is hydrogen or an alkyl radical and n is an integer of from 0 - 40; said modified polyester having a hydroxyl number of from about 50 - 400 mg KOH/g, an acid value of below about 10 mg KOH/g, and an intrinsic viscosity of from about 6 - 11 ml/g, measured in dimethyl- formamide at 20°C.; and (B) 15 - 50% by weight of a film forming resin containing carboxyl groups to provide an acid value of from about 100 - 300 mg KOH/g and an intrinsic viscosity of from about 5 - 9 ml/g, measured in dimethyl- formamide at 20°C.; the ratio of the intrinsic viscosity values of components (A) and (B) being governed by the relation Image = 1.2 to 2.2. - 2 - 1300/US1490 The paint binders, at a high solids content and with a high water to organic solvent ratio, have a viscosity sufficiently low to be suitable for spray applications. The paint binders in paint formulations provide paint films having good physical characteristics. - 2a -

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