Polyester-polyurethane hybrid resin molding compositions...

C - Chemistry – Metallurgy – 08 – G

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C08G 18/68 (2006.01) C08G 18/75 (2006.01)

Patent

CA 2620015

A hybrid resin composition is described, with the composition comprising: A. an A part composition comprising an aliphatic polyfunctional isocyanate compound and a free radical polymerization initiator; and B. a B part composition comprising an ethylenically unsaturated, substantially water-free polyester polyol and a polyurethane catalyst. The A part composition can contain a non-interfering solvent, e.g., styrene, and the B part composition typically has an acid value of 5 or less (based on solids). For outdoor use, the B part composition is preferably free of tertiary hydrogens, ether glycols and terephthalic acid residues.

L'invention concerne une composition de résine hybride contenant (A) une composition de partie A qui renferme un composé d'isocyanate polyfonctionnel aliphatique et un initiateur de la polymérisation à radicaux libres et (B) une composition de partie B qui renferme un polyol de polyester sensiblement exempt d'eau, insaturé éthyléniquement et un catalyseur de polyuréthanne. Ladite composition de partie A peut contenir un solvant qui n'interfère pas, par exemple, un styrène, et la composition de partie B possède une valeur acide inférieure ou égale à 5 (basée sur des solides). Pour une utilisation extérieure, la composition de partie B est, de préférence, exempte d'hydrogènes tertiaires, de glycols d'éther et de résidus d'acide téréphtalique.

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