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AssigneeMitsui Chemicals, Inc.
InventorsYasunori Yoshida, Shoji Obuchi, Yasuhiro Kitahara, Takayuki Watanabe, Hisashi Aihara, Tomoyuki Nakata, Kazuhiko Suzuki, Masanobu Ajioka
Estimating the term…
A polylactic acid-based resin composition composed of a high molecular ingredient (A) comprising polylactic acid (a1) and an aliphatic polyester (B), and a film, particularly an inflation film, prepared from the resin composition. The film comprising the polylactic acid-based resin composition of the invention is biodegradable and excellent in flexibility and resistance to blocking of film and bleeding-out of plasticizer, has no anisotropy in tear strength, and can be suitably used for an agricultural multi-film and garbage bag. When the film of the invention is used for food wrapping, the film prevents fungus growth and contamination of color or odor, and thus can be suitably used.
A polylactic acid-based resin composition comprising 100 parts by weight of an ingredient (A) and 5 to 25 parts by weight of a biodegradable plasticizer (B), wherein said ingredient (A) comprises 55-85% by weight of polylactic acid (a1) having a weight average molecular weight of at least 10,000 and 15 to 45% by weight of a biodegradable aliphatic polyester (a2) having a weight average molecular weight of at least 10,000 and having a melting point of 80 to 250° C.
A polylactic acid-based resin film comprising a polylactic acid-based resin composition comprising 5 to 25 parts by weight of a biodegradable plasticizer (B) for 100 parts by weight of an ingredient (A) containing 55 to 85% by weight of polylactic acid (a1) having a weight average molecular weight of at least 10,000 and 15 to 45% by weight of a biodegradable aliphatic polyester (a2) having a weight average molecular weight of at least 10,000 having a melting point of 80 to 250° C., having an elastic modulus of 200 to 1,000 MPa and having a longitudinal/transverse ratio of 0.8 to 1.2 in tear strength and which does not exude plasticizer or exhibit blocking at 60 to 120° C.
A process for preparing a polylactic acid-based resin film by inflation-molding a polylactic acid-based resin composition comprising 5 to 25 parts by weight of a biodegradable plasticizer (B) for 100 parts by weight of an ingredient (A) containing 55 to 85% by weight of polylactic acid (a1) having a weight average molecular weight of at least 10,000 and 15 to 45% by weight of a biodegradable aliphatic polyester (a2) having a weight average molecular weight of at least 10,000 and having a melting point of 80 to 250° C., at resin extrusion temperature of 150 to 220° C. with a blow-up ratio of 1.5 to 3.0.
Dependencies are inferred from the claim text.