Highly elastic polyurethane hot-melt adhesives

Details Highly elastic polyurethane hot-melt adhesives Highly elastic polyurethane hot-melt adhesives

2006-05-30

2006-05-30

Mullis, Jeffrey (Department: 1711)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

Reexamination Certificate

active

07053152

ABSTRACT:
A process for the production of a polyurethane hot-melt adhesive based on grafted polyester-polyether block copolymers with grafted-on hydroxyl groups and the reaction thereof with a stoichiometric excess of a polyisocyanate and the optional mixing thereof with further pre-polymers based on polyether polyols and polyester polyols is disclosed. By this process, the polyester-polyether block copolymers are firmly incorporated into the polyurethane matrix on curing, so that they are migration-proof. Highly-elastic hot-melt adhesives result, which, with optional foaming, are also suitable for the production of elastic seals.

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