Thermoplastic copolyesters prepared from aromatic dicarboxylic a

Details Thermoplastic copolyesters prepared from aromatic dicarboxylic a Thermoplastic copolyesters prepared from aromatic dicarboxylic a

1977-08-01

1978-10-24

Welsh, M. J.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260 26, 260860, 528302, C08L 6702

Patent

active

041220730

ABSTRACT:
A copolyester is formed of at least one aromatic dicarboxylic acid member, at least one aliphatic dicarboxylic acid member (an alkyl- or alkenyl-substituted succinic acid or anhydride thereof), at least one C.sub.2 -C.sub.10 glycol, at least one polymeric polyol member, and an optional polymeric polycarboxylic acid member. The polymeric polyol member is either a polymeric polyol having a molecular weight of 300-3,000, or a mixture of polymeric diol having a molecular weight of 300-3,000 and a non-polymeric polyol. The polymeric polyol may be a polyester such as polycaprolactone or a polyether such as a trimethylolpropane/propylene oxide adduct. The preferred resultant thermoplastic copolyester has a glass transition temperature of less than 0.degree. C. and a high polymer melting temperature. It is useful as an adhesive both by itself and as an ingredient of hot melt or solution adhesive formulations. In producing the copolyester, an intermediate copolyester of the aromatic dicarboxylic acid member, the alkphatic dicarboxylic acid member, and the glycol is chain extended by reaction with the polymeric polyol member and optional polymeric polycarboxylic acid member in a 2-7 hour reaction at about 225.degree.-265.degree. under about 1-30 mm. Hg. pressure absolute.

REFERENCES:
patent: 3329740 (1967-07-01), Battersby
patent: 3383343 (1968-05-01), Mohajer et al.
patent: 3390108 (1968-06-01), Keck et al.
patent: 3542737 (1970-11-01), Keck et al.
patent: 3804921 (1974-04-01), Jamison
patent: 3832314 (1974-08-01), Hoh et al.
patent: 3975323 (1976-08-01), Georgoudis et al.

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