Oriented films of polylactic acid and methods of producing same

Details Oriented films of polylactic acid and methods of producing same Oriented films of polylactic acid and methods of producing same

1994-06-24

1995-08-22

Foelak, Morton

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Reshaping running or indefinite-length work

2641761, 2642884, 2642888, B29C 5500

Patent

active

054437806

ABSTRACT:
An oriented film with improved tensile strength and Young's modulus can be produced by melting and extruding poly-L-lactic acid and/or poly-D-lactic acid to form a film and, after the film is cooled rapidly, by subjecting it to a stretching process at a temperature above the glass transition temperature and below the cold-crystallization temperature. The stretching may be effected by a method of uniaxial stretching with constant width, successive biaxial stretching or simultaneous biaxial stretching. A thermal treatment may be effected after the stretching process. Films thus obtained have tensile strength over 6 kgf/mm.sup.2 in the stretching direction, Young's modulus over 220 kgf/mm.sup.2 in the stretching direction and transparency to visible light over 90%.

REFERENCES:
patent: 5298602 (1994-03-01), Shikinami et al.

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