Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1994-03-25
1995-04-04
Kight, III, John
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
428480, 525415, 525437, 525450, 528272, 528308, 528354, C08F 2000, B32B 2736, C08G 6308
Patent
active
054038979
ABSTRACT:
A process for producing a lactic acid-based copolyester by the ring-opening copolymerization and transesterification of a lactide (A) with an aromatic polyester (B) and/or an aliphatic polyester (C) in the presence of a ring-opening polymerization catalyst (D), and a packaging material comprising the lactic acid-based copolyester obtained by the process are disclosed. According to the present invention, a lactic acid-based degradable copolyester which has a sufficiently high molecular weight and satisfactory toughness and also has suitable rigidity, pliability, and transparency according to applications can be produced. Further, a general-purpose packaging material, e.g., a sheet or film, which comprises the lactic acid-based copolyester produced by the process and is excellent in formability, degradability, and transparency can also be produced.
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patent: 4507444 (1985-03-01), Slawyk et al.
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patent: 4877682 (1989-10-01), Sauers et al.
patent: 5202413 (1993-04-01), Spinu
Derwent Publications Ltd., London, GB; AN 74-16776V, abstract.
Derwent Publications Ltd., London, GB; JP-B-49 006 554 (Mitsubishi Rayon Co., Ltd.) 14 Feb. 1974, abstract.
Arai Kosuke
Ebato Hiroshi
Furuta Hideyuki
Kakizawa Yasutoshi
Oya Satoshi
Dainippon Ink & Chemicals Inc.
Dodson Shelley A.
Kight III John
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