| 摘要 |
There are provided moisture-curable hot-melt compositions comprising a polyurethane prepolymer and a crystalline polymer obtained from monomer(s) containing at least one crystalline ethylenically unsaturated monomer with no active hydrogen, which have low melt viscosities and high initial impact strength and final strength. The monomers may also contain amorphous ethylenically unsaturated monomers with no active hydrogen, in addition to the crystalline monomer. Typical crystalline monomers are (meth)acrylate esters of non-tertiary alcohols, the alkyl portions of which comprise 16 or more carbon atoms. Typical amorphous monomers are (meth)acrylate esters of non-tertiary alcohols, the alkyl portions of which comprise no more than 15 carbon atoms. Use of an alkyl acrylamide as one of the amorphous monomers is advantageous for improving the performance of the moisture-curable hot-melt adhesive. |
