C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
400/5156
C08G 18/67 (2006.01) C08G 18/12 (2006.01) C08G 18/42 (2006.01) D06N 3/08 (2006.01) D06N 3/14 (2006.01)
Patent
CA 1101585
WGT-SLW 12-20-77 5360 PHOTOPOLYMERIZABLE AND MOISTURE CURABLE COATING CONTAINING PARTIALLY CAPPED ISOCYANATE PREPOLYMERS AND ACRYLATE MONOMERS Abstract of the Disclosure A liquid radiation and moisture curable 100% reactive coating which cures to yield a clear, tough, glossy abrasion-resistant cured coating is described. The radiation and moisture curable 100% reactive coating composition comprises: 15 to 60 parts by weight acrylate diluents; and 40 to 85 parts by weight of isocyanate terminated urethane prepolymers formed by reacting a mixture of polyester diols and triols with excess aliphatic diisocyanate to form -NCO terminatd prepolymer and then reacting the -NCO terminated prepolymers with sufficient hydroxy acrylate to cap between about 5% and 15% of the available -NCO sites to form addition polymerizable ethylenically unsaturated sites and a photo- initiator when light is the radiation source. When the coating is exposed to a source of radiation, the ethylenically unsaturated monomers and prepolymers polymerize to develop a tack-free surface coating, after which the partially reacted coating is further polymerized through the isocyanate terminated prepolymer portion by moisture curing to form the fully cured tough, glossy, abrasion-resistant coating. The coatings of this invention are particularly well adapted for providing a decorative thermoplastic surface covering with a clear, tough, glossy, abrasion- resistant, light-stable, no wax wear layer.
311004
Armstrong World Industries Inc.
Gowling Lafleur Henderson Llp
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