| 摘要 |
<p>Disclosed are laminates and hot melt adhesive formulations containing dihydrocarbyl azodicarboxylate-modified multiblock copolymers. The copolymer contains terminal non-elastomeric polymonovinylarene blocks and a non-terminal elastomeric block of conjugated diene. The unmodified multiblock copolymer has a molecular weight of from 20,000 to 250,000, and the elastomeric block comprises from 40 to 90 weight percent of the unmodified block copolymer. The block copolymer is modified by reaction with from 10 to 100 weight percent, especially from 20 to 80 weight percent, on a basis of the unmodified elastomeric block of a dihydrocarbyl azodicarboxylate to obtain a modified multiblock copolymer wherein the elastomeric block contains pendant bicarbamate moieties. The hot melt adhesive composition includes the multiblock copolymer and a compatible tackifier at a ratio of tackifier to copolymer of from 10:90 to 90:10 and may also include up to 40 weight percent of an oil of the copolymer and tackifier. The laminate has at least one polyester substrate to which the adhesive composition is adhered.</p> |
