Patent ID: 6180744
Filing Date: 2001-01-30
Classification: C08G,Y10S

Abstract:
A moisture curing hot melt adhesive composition, which composition comprises at least one isocyanate-terminated polyester, wherein at least 40% by weight of all isocyanate-terminated polyesters present in the composition are obtained by enzyme catalyzed polyesterification, in the presence or absence of an inert organic solvent, followed by reaction of the polyester with a disocyanate,wherein the polyesters obtained by enzyme catalysed polyesterification comprise as repeating units:(i) residues of at least one aliphatic hydroxycarboxylic acid having a least one non-sterically hindered primary or secondary hydroxyl or an ester or anhydride thereof; or(ii) residues of (a) at least one aliphatic dicarboxylic acid, ester or anhydride thereof, (b) at least one aliphatic diol, or aliphatic polyol having at least two non-sterically hindered primary or secondary hydroxyls, and optionally (c) at least one aliphatic hydroxycarboxylic acid having at least one non-sterically hindered primary or secondary hydroxyl, or an ester or anhydride thereof;and wherein the isocyanate-terminated polyesters are obtained from polyesters having a hydroxyl value of 5 to 110 mg. KOH/g.