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(12) PATENT APPLICATION PUBLICATION
(19) INDIA (21) APPLICATION No: 827/MAS/1997A
(22) Date of filing of Application:22/04/1997 (43) Publication Date: 09/06/2006
(54) Title of the invention:
BULK REACTIVE EXTRUSION
POLYMERIZATION PROCESS
PRODUCING ALIPHATIC ESTER
POLYMER COMPOSITIONS
(51)International classification:C08G 63/08
(31) Priority Document No.08/639,198
(32) Priority Date:26/04/1996
(33) Name of priority country:US
(87) WIPO No. :
(61) Patent of addition to
Application No. :
Filed on:
(62) Divisional to
Applcation No.:
Filed on:
(71) Name of Applicant
BOARD OF TRUSTEES
Address of Applicant:
A CONSTITUTIONAL CORPORATION
OPERATING MICHIGN STATE
UNIVERSITY, EAST LANSING,
MICHIGAN 48824.,
USA
(72) Name of the Inventor(s):
RAMANI NARAYAN,
MOHAN KRISHNAN,
JOSEPH B. SNOOK,
AJAY GUPTA,
PHILIPE DUBOIS
(57)Abstract
A bulk extrusion polymerization process to derive an aliphatic polyester from a suitable ester monomer, preferably ecaprolactone.
Novel reaction formulations containing less than 100 ppm water and havig 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(e-caprolactone) polymer of number average molecular
ZHLJKW 0R JUHDWHU WKDQ $ QRYHO SRO\}-caprolactone) intermediate optionally grafted to starch, is described
which has significantly different processing and use characteristics as compared to a straight-chain polycaprolactone.
The Patent Office Journal 09/06/2006 10823