Biodegradable resin film or sheet and process for producing the same
First Claim
1. A process for producing a biodegradable resin drawn film or biodegradable resin drawn sheet which comprises the steps of melt extruding a mixture comprising two types of the biodegradable resins having glass transition temperatures Tg which differ by greater than or equal to 25°
- C. according to the differential scanning calorimetry (JIS-K
7121), and drawing in at least one direction until the thickness of the ultimate film or sheet becomes greater than or equal to 1/200 times and less than or equal to 1/40 times the height of the die lip opening (in other words, until the area of the ultimate film or sheet becomes greater than or equal to 40 times and less than or equal to 200 times as large as the area of the film or sheet just extruded from the die lip).
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Accused Products
Abstract
A biodegradable resin drawn film or biodegradable resin drawn sheet that is excellent in transparency, impact resistance and film re-forming capability (recyclability); and a process for producing the same. In particular, a biodegradable resin drawn film or biodegradable resin drawn sheet composed mainly of a mixture of (A) a biodegradable resin of greater than or equal to 30° C. as a glass transition temperature Tg and (B) a biodegradable resin of less than or equal to 5° C. as a glass transition temperature Tg characterized in that a multiplicity of domains comprising component (B) mainly in the configuration of lamellar or rod-shaped pieces are present in a continuous phase comprising component (A) substantially in parallel to the external surface of the film or sheet; and a process for producing the same.
28 Citations
4 Claims
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1. A process for producing a biodegradable resin drawn film or biodegradable resin drawn sheet which comprises the steps of melt extruding a mixture comprising two types of the biodegradable resins having glass transition temperatures Tg which differ by greater than or equal to 25°
- C. according to the differential scanning calorimetry (JIS-K
7121), and drawing in at least one direction until the thickness of the ultimate film or sheet becomes greater than or equal to 1/200 times and less than or equal to 1/40 times the height of the die lip opening (in other words, until the area of the ultimate film or sheet becomes greater than or equal to 40 times and less than or equal to 200 times as large as the area of the film or sheet just extruded from the die lip). - View Dependent Claims (2, 3, 4)
- C. according to the differential scanning calorimetry (JIS-K
Specification