Polyurethane-polyester hybrid resin system having improved...

C - Chemistry – Metallurgy – 08 – G

Patent

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Details

C08G 18/68 (2006.01) C08K 5/00 (2006.01) C08K 5/13 (2006.01) C08L 67/06 (2006.01) C08L 75/06 (2006.01)

Patent

CA 2222093

The present invention is drawn to a polyurethane-polyester hybrid resin system wherein the components of the system have improved shelf life stability. The resin system comprises an A-Side comprising a multifunctional isocyanate and a free radical initiator. The hybrid resin system also comprises a B-Side comprising a hydroxyl-terminated unsaturated polyester polyol, an ethylenically unsaturated monomer, a polyurethane catalyst, a polymerization inhibitor, and optionally a peroxide promoter, chain extender and filler. The B-Side polymerization inhibitor of the present invention comprises substituted hindered phenol-type compounds with ring substituents producing activated benzylic hydrogen, nitrophenols with or without benzylic-type substituents, naphthoquinones, stabilized radical compounds, and mixture thereof.

La présente invention se rapporte à un système de résines hybrides de polyuréthane et polyester dans lequel les composants du système possèdent une stabilité de conservation améliorée. Ce système de résines comporte un côté A comprenant un isocyanate multifonctionnel et un initiateur de radicaux libres. Ce système de résines comporte également un côté B comprenant un polyol de polyester insaturé à terminaison hydroxyle, un monomère éthyléniquement insaturé, un catalyseur de polyuréthane, un inhibiteur de polymérisation et éventuellement un promoteur au peroxyde, un allongeur de chaîne et une charge. L'inhibiteur de polymérisation du côté B comporte des composés de type phénol entravés et substitués avec des substituants cycliques produisant des hydrogènes benzyliques activés, des nitrophénols contenant ou non des substituants de type benzylique, des composés de radicaux stabilisés ainsi que des mélanges de ces derniers.

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