Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Patent
1994-07-08
1996-01-16
Hampton-Hightower, P.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
528272, 528354, 528357, 528480, C08G 6308, C08F 600
Patent
active
054848822
ABSTRACT:
The present invention provides a process for the continuous production of a biodegradable polyester polymer with an excellent quality useful in the field of medicine, coating material and packaging material by eliminating difficulty in uniform agitation and heat removal caused by the rise in the viscosity of reactants in the production of a high molecular biodegradable polyester polymer by ring-opening polymerization. In some detail, the present invention provides a process for the continuous production of a biodegradable polyester polymer having a melt viscosity of not more than 500,000 poise and a weight-average molecular weight of not less than 10,000, which comprises continuously supplying monomers or polymers selected from the group consisting of intermolecularly cyclized ester of hydroxycarboxylic acid, lactone, and polymer having hydroxyl group and/or ester bond into a continuous reaction apparatus equipped with a static mixer where the reactants are subjected to continuous polymerization reaction at a polymerization temperature of 125.degree. to 270.degree. C., a maximum system reaction pressure of 2 to 15 Kg/cm.sup.2 and a conversion (one pass) of not less than 85% in the presence or absence of solvent without coming into contact with oxygen and water in the atmosphere, and then subjected to devolatilization to remove and recover residual monomers and solvent for reuse.
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Kirk-Othmer's Encyclopedia of Chemical Science & Technology, vol. 9, p. 311 "Esters, Organic".
Kakizawa Yasutoshi
Takada Morio
Dainippon Ink and Chemicals Inc.
Hampton-Hightower P.
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