multimodal polymer blend of at least three fractions, hot-applied adhesive composition, article and method for making it

摘要

A multimodal mixture of polymers of at least three fractions is proposed as determined by tref. the mixture comprises a first propylene-based polymer, a second propylene-based polymer; and a third propylene-based polymer; wherein, when subjected to tref, the polymer mixture exhibits: a first fraction which is soluble at -15 ° C in xylene, the first fraction having an isotactic triad tactic (mm) of from about 55 mole% to about 85% mol; a second fraction which is insoluble at -5 ° C in xylene or dichlorobenzene and soluble at 40 ° C in xylene or dichlorobenzene; and a third fraction which is insoluble at -70 ° C in xylene or dichlorobenzene and with an isotactic triad tactic (mm) of from about 85 mole% to about 98 mole%. Also hot-melt adhesive mix compositions, a tackifier, a wax and, optionally, a nucleating agent, articles containing the adhesive and methods for making them are proposed.