Chemistry of carbon compounds – Miscellaneous organic carbon compounds
Patent
1975-01-21
1976-08-17
Jacobs, Lewis T.
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
260 75, 260 47UA, 260 75UA, C08L 9100
Patent
active
039753239
ABSTRACT:
A copolyester is formed of at least one symmetrical aromatic dicarboxylic acid member, at least one dimer acid, and at least one C.sub.2 --C.sub.10 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 nonpolymeric polyol. The resultant thermoplastic copolyester has a glass transition temperature of less than 25.degree.C and a polymer melting temperature greater than 70.degree.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 with the polyester polyol member in a 2-6 hour reaction at about 225.degree.-270.degree.C under a vacuum of about 1-30 mm. Hg. pressure.
REFERENCES:
patent: 3033822 (1962-05-01), Kibler
patent: 3158584 (1964-11-01), Laymon
patent: 3235520 (1966-02-01), Crowell
patent: 3390108 (1968-06-01), Keck
Georgoudis Paul C.
Puletti Paul P.
Ray-Chaudhuri Dilip K.
Schoenberg Jules E.
Jacobs Lewis T.
National Starch and Chemical Corporation
Parker William E.
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