Stock material or miscellaneous articles – Hollow or container type article – Nonself-supporting tubular film or bag
Patent
1996-04-24
1998-07-21
Cannon, James C.
Stock material or miscellaneous articles
Hollow or container type article
Nonself-supporting tubular film or bag
220DIG30, 428 357, 428402, B32B 102, B32B 3300
Patent
active
057832714
ABSTRACT:
A process for the production of biodegradable aliphatic polyester particles by (co)polymerizing 2-oxetanone or a mixture containing at least 80% by weight of 2-oxetanone and up to 20% by weight of a cyclic ester or cyclic ether other than 2-oxetanone in the presence of a polymerization initiator supported on a carrier in which an ion polymerization initiator is supported on poly(2-oxetanone) in a liquid medium having a solubility parameter of about 15 to about 18 MPa.sup.1/2 and being capable of dissolving 2-oxetanone, and in a polymerizing apparatus having an internal surface formed of a material which is free of polarity or whose polarity is very small, to form a particulate aliphatic polyester; and a biodegradable aliphatic polyester melt-extrusion film, which comprises the biodegradable aliphatic polyester having a weight average molecular weight of 20,000 to 2,000,000, and having a water vapor transmission rate of 300 to 700 g/m.sup.2 .multidot.24 hours.multidot.25 .mu.m and heat-fusing strength of 500 to 5,000 gf/15 mm.
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Hattori Norikazu
Kuwaki Tetsuo
Nishida Haruo
Ochi Yoshiki
Yamashita Mitsuhiro
Cannon James C.
Tokuyama Corporation
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