U.V. curable poly(ester-urethane) polyacrylate polymers and wet look coatings therefrom
AssigneeSCM Corporation
InventorVincent W. Ting
Life of this patent
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Abstract
Polyester-urethane polymers, prepared from the reaction of specific molar ratios of diisocyanates with specific mixtures of polyesterdiols, glycols, triols and tetraols, and having 4-10 reactive isocyanate groups are further reacted with hydroxyalkyl acrylates through the free isocyanate functionality to provide oligomers having from about 4-10 acrylates units per each mole unit of polyurethane chain. Such polymers when crosslinked under ultraviolet radiation in the presence of photosensitizers, specific reactive monofunctional acrylate solvents and multifunctional acrylate cross-linking agents cure without air inhibition to yield superior "wet look" finishes especially useful for coating metal, wood and floor tile.
Claims15
A poly(ester-urethane) polyacrylate polymer comprising the product obtained by reacting a polyurethane intermediate having 4 to 10 terminally-positioned reactive isocyanate groups with 4 to 10 molar equivalents of a hydroxy (lower) acrylate or methacrylate said intermediate resulting from the reaction of 1 to 7 moles of a polyester diol having a molecular weight in the range of 500 to 12,000;
- 2 to 8 moles of a monomer polyol having 3 to 12 carbon atoms and at least 3 reactive hydroxyl groups;
- and 6 to 24 moles of an organic diisocyanate.
Dependencies are inferred from the claim text.