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US 4,946,535 AGranted
Polyester polyurethanes containing hydroxyl end groups and their use as adhesives
AssigneeBayer Aktiengesellschaft
InventorsWalter Meckel, Horst Muller-Albrecht, Manfred Dollhausen
Life of this patent
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Abstract
This invention relates to new, substantially linear polyester polyurethanes containing hydroxyl end groups, based on selected starting materials, and their use as adhesives or for the production of adhesives.
Claims7
Substantially linear polyester polyurethane containing hydroxyl end groups, prepared by reacting
- (a) a polyester diol having a molecular weight above 600 and
- (b) an organic diisocyanate, optionally in the presence of
- (c) diols in the molecular weight range of from 62 to 600 as chain lengthening agents,
- at an equivalent ratio of hydroxyl groups to isocyanate groups of from 1:0.9 to 1:0.999, and wherein at least 80% by weight of component (a) consists of a polyester diol having a molecular weight of from 4000 to 6000 based on (i) adipic acid and (ii) a mixture of 1,4-dihydroxy butane and 1,6-dihydroxy hexane in a molar ratio of from 4:1 to 1:4.
1 more element
Dependencies are inferred from the claim text.