C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
400/2012, 400/30
C08G 18/40 (2006.01) C08F 299/06 (2006.01) C08G 18/63 (2006.01) C08G 18/67 (2006.01) C08G 18/80 (2006.01) C08L 51/08 (2006.01) C08L 75/00 (2006.01) C09J 175/16 (2006.01)
Patent
CA 1052032
Abstract of the Disclosure A polymerizable composition, suitable for use as an adhesive, sealant or coating, comprising a urethane-acrylate- capped prepolymer based on a graft poloy derived from the reaction between the polyol and a vinyl monomer or polymer. More specifically, the composition comprises I. a polymerizable product corresponding in structure to a reaction product of: (a) a poly(alkylene)ether polyol to which a vinyl radical has been grafted, with either of: (b)(i) a molar excess of a reaction product of: a molar excess of an aromatic or cyclo- aliphatic polyisocyanate with a compound selected from the group consisting of an aromatic or cycloalphatic polyol or polyamine, or (ii) a molar excess of an aromatic or cyclo- alkphatic polyisocyanate, the product of (a) and (b)(i) or (a) and (b)(ii) subsequently being reacted with a molar excess of a hydroxyalkyl acrylate, a hydroxyalkyl methacrylate, an aminoalkyl acrylate, or an aminoalkyl methacrylate; and II. a free radical initiator. In a preferred embodiment, the graft polyol is present as the disperse phase of a polymer/ polyol dispersion. The composition provides improved general properties, particularly cure-through-gap and impact properties. The composition typically has a relatively low viscosity, making it especially useful for "retaining" purposes. A process for preparing the composition and a process for using it are also disclosed.
246571
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