U.V. Curable poly(ether-urethane) polyacrylates and wet-look polymers prepared therefrom
AssigneeSCM Corporation
InventorVincent Wen-Hwa Ting
Life of this patent
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Abstract
Polyether-urethane polymers, prepared from the reaction of specific molar ratios of diisocyanates with specific mixtures of polyetherdiols, glycols, triols and tetraols, and having 4-10 reactive isocyanate groups are further reacted with hydroxyalkyl acrylates through the free isocyanate functionality to provide polymers 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.
Claims16
A poly(ether-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 polyether diol having a molecular weight in the range of 100 to 10,000;
- 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.