Biodegradable aliphatic polyester, melt-extrusion film thereof,

Details Biodegradable aliphatic polyester, melt-extrusion film thereof, Biodegradable aliphatic polyester, melt-extrusion film thereof,

1995-04-25

1998-05-12

Acquah, Samuel A.

Stock material or miscellaneous articles

Hollow or container type article

Nonself-supporting tubular film or bag

528220, 528222, 528361, 528365, 528366, 528403, 528408, 528417, 524700, 524401, 524443, 428 355, 428 357, 428 358, 428402, B32B 108

Patent

active

057502188

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.

REFERENCES:
patent: 4080356 (1978-03-01), Gergen et al.
patent: 4090996 (1978-05-01), Gergen et al.
patent: 4797447 (1989-01-01), Gergen et al.
patent: 4868243 (1989-09-01), Gelles et al.
patent: 5281663 (1994-01-01), Gelles et al.

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