Bulk reaction extrusion polymerization process producing aliphat

Details Bulk reaction extrusion polymerization process producing aliphat Bulk reaction extrusion polymerization process producing aliphat

1997-09-08

1999-05-25

Yoon, Tae

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Stretching or stretch forming

264165, 2641761, 528357, B29C 4900, B29C 5530, B29C 4322, C08G 6308

Patent

active

059067837

ABSTRACT:
A bulk extrusion polymerization process to derive an aliphatic polyester from a suitable ester monomer, preferably .epsilon.-caprolactone. Novel reaction formulations containing less than 100 ppm water and having an acid value less than 0.5 mg KOH/g and preferably less than 0.2 mg KOH/g enable the polymerization of bulk monomer in an extruder in a resident time of less than 2 minutes. Different catalyst and initiator systems, processing protocols, and screw configurations lead to the preferred manufacture of poly(.epsilon.-caprolactone) polymer of number average molecular weight, M.sub.n, greater than 100,000. A novel poly(.epsilon.-caprolactone) intermediate optionally grafted to starch, is described which has significantly different processing and use characteristics as compared to a straight-chain polycaprolactone.

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