Tack-free low voc vinylester resin

C - Chemistry – Metallurgy – 08 – G

Patent

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Details

C08G 59/00 (2006.01) C08F 283/10 (2006.01) C08F 290/06 (2006.01) C08F 290/14 (2006.01)

Patent

CA 2564469

Low VOC vinyl ester resins exhibit improved cure in an oxygen containing environment. The vinyl ester resins comprise the reaction product of a composition comprising an epoxy resin having at least two epoxy groups per molecule; a polybasic anhydride; unsaturated monobasic acids comprising up to about 10 molar percent dicyclopentadienyl monomaleate based on the total unsaturated monobasic acids, and more preferably the vinyl ester resin has a viscosity of less than about 1200 mPa.s (cp) measured at a shear of 500 s-1 in styrene at 70% non-volatile matter. Barrier coats and gel coats comprising such vinyl ester resins have acceptable tackiness and physical characteristics. A process to make such vinyl ester resins is also described.

L'invention concerne des résines vinylester à faible COV qui durcissent mieux dans un environnement oxygéné. Les résines vinylester à faible COV renferment le produit de réaction d'une composition qui contient une résine époxyde pourvue d'au moins deux groupes époxydiques par molécule; un anhydride polybasique; des acides monobasiques insaturés qui contiennent jusqu'à environ 10 en pourcentage molaire de dicyclopentadiényle monomaléate, sur la base du total d'acides monobasiques insaturés; la résine vinylester présente, préférablement, une viscosité inférieure à environ 1200 mPa.s (cp), mesurée avec un cisaillement de 500 s?-1 ¿dans le styrène à 70 % de matière non volatile. Des couches d'isolation contenant ces résines vinylester présentent un poissage et des caractéristiques physiques acceptables. L'invention concerne en outre un procédé de fabrication de ces résines vinylester.

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