| 摘要 |
<p>The invention herein relates to polyurethane coating and adhesive compositions containing partially unsaturated monohydroxylated polydiene polymers which are comprised of at least two polymerizable ethenically unsaturated monomers wherein at least one is a diene monomer which yields unsaturation suitable for epoxidation. The invention preferably encompasses the use of epoxidized derivatives of these novel partially unsaturated monohydroxylated polydiene polymers and epoxidized derivatives of unsaturated monohydroxylated polydiene polymers in such coating and adhesive compositions. The preferred monohydroxylated polydiene polymer of the present invention has the structural formula (I) (HO)x-A-Sz-B-(OH)y wherein A and B are polymer blocks which may be homopolymer blocks of conjugated diolefin monomers, copolymer blocks of conjugated diolefin monomers, or copolymer blocks of diolefin monomers and monoalkenyl aromatic hydrocarbon monomers. The A blocks have a molecular weight of from 100 to 6,000, preferably 100 to 3,000, and most preferably 500 to 2,000, and the B blocks have a molecular weight of from 1,000 to 15,000, preferably 3,000 to 7,000, and most preferably 2,000 to 6,000. S is a vinyl aromatic hydrocarbon block which may have a molecular weight of from 500 to 10,000. x and y are 0 or 1 and either x or y must be 1 but only one at a time can be 1. z is 0 or 1. These polymers are preferably epoxidized such that they contain from 0.5 to 7.0 milliequivalents (meq) of epoxy per gram of polymer.</p> |
