Copolyesters, method of manufacturing same, and hot melt...

Details Copolyesters, method of manufacturing same, and hot melt... Copolyesters, method of manufacturing same, and hot melt...

C - Chemistry, Metallurgy

08

G

400/1808, 402/19

C08G 63/48 (2006.01) C08G 63/08 (2006.01) C08G 63/16 (2006.01) C08G 63/52 (2006.01) C09J 5/06 (2006.01)

Patent

CA 1047690

ABSTRACT OF THE DISCLOSURE A copolymer is formed of at least one symmet- rical aromatic dicarboxylic acid member, at least one dimer acid, and at least one C2-C10 glycol, and at least one polyester polyol member. The polyester polyol member is either a polycaprolactone polyol having a molecular weight of 500-5,000, or a mixture of a polycaprolactone diol having a molecular weight of 300-5,000 and a non- polymeric polyol. The resultant thermoplastic copolyester has a glass transition temperature of less than 25°C and a polymer melting temperature greater than 70°C, and is useful both as a hot melt adhesive by itself and as an ingredient of both pressure sensitive and non-pressure sensitive hot melt adhesive formulations. In producing the copolyester, an intermediate copolyester of the symmetrical aromatic dicarboxylic acid member, the dimer acid, and the glycol is chain extended by reaction at about 225-270°C under a vacuum of about 1-30 mm. Hg. pressure.

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