Hot melt adhesive containing hydroxyl-functional ethylene-vinyl acetate and blocked polyisocyanate
AssigneeAtochem
InventorsJacques Boutillier, Noelle Forichon, Yves Lermat
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Abstract
A composition for a cross-linkable hot melt adhesive is provided and is formed by an ethylene-vinyl acetate copolymer containing primary hydroxyl functions and a blocked polyisocyanate. This composition when associated with a tackifying resin, which can also serve as blocking agent of the polyisocyanate, is a cross-linkable hot melt adhesive. The adhesive is used at a temperature at least equal to splitting temperature of the isocyanate functions of the polyisocyanate. The temperature at which such adhesives retains adherence can reach about 200.degree.-220.degree. C.
Claims6
A composition for a cross-linkable hot melt adhesive having a base of ethylene-vinyl acetate copolymer, consisting essentially of a blocked polyisocyanate associated with an ethylene-vinyl acetate copolymer that possesses primary hydroxyl functions contributed by an ethylenic monomer having at least one primary hydroxyl function and wherein said polyisocyanate is blocked by a tackifying resin having free phenolic functions.
Dependencies are inferred from the claim text.