Biaxially stretched polylactic acid multilayer film and the...

Details Biaxially stretched polylactic acid multilayer film and the... Biaxially stretched polylactic acid multilayer film and the...

2006-08-08

2006-08-08

Chen, Vivian (Department: 1773)

Stock material or miscellaneous articles

Composite

Of polyester

C428S343000, C428S346000, C428S347000, C428S349000, C428S910000, C525S437000, C525S444000, C525S450000, C528S302000, C528S307000

Reexamination Certificate

active

07087313

ABSTRACT:
Disclosed is a biaxially stretched polylactic acid multilayer film and the use thereof as packaging film. The gist of the biaxially stretched polylactic acid multilayer film resides in the construction wherein a substrate layer (1) of the biaxially stretched film comprised of polylactic acid (A) has been laminated on at least one surface thereof with a coating layer (II) of an aliphatic polyester composition (D) comprised of 97˜5% by weight of an aliphatic polyester copolymer (B) having a melting point (Tm) of 80˜120° C., a crystallizing temperature (Tc) of 35˜75° C. and a difference of (Tm)−(Tc) within the range of 35˜55° C. and comprising an aliphatic or alicyclic dicarboxylic acid component (b1), an aliphatic or alicyclic dihydroxyl compound component (b2) and a difunctional aliphatic hydroxycarboxylic acid component (b3) and 3˜95% by weight of a polylactic acid copolymer (C) containing 7˜30% by weight of D-lactic acid, a total of the ingredients (B) and (C) being 100% by weight.

REFERENCES:
patent: 5843573 (1998-12-01), Itoh et al.
patent: 5883199 (1999-03-01), McCarthy et al.
patent: 6153276 (2000-11-01), Oya et al.
patent: 6521336 (2003-02-01), Narita et al.
patent: 2002/0065345 (2002-05-01), Narita et al.
patent: 2005/0288452 (2005-12-01), Wakaki et al.

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