Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1995-05-18
1997-08-05
Acquah, Samuel A.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
528272, 528275, 528277, 528279, 528281, 528283, 528287, C08F 2000
Patent
active
056543808
ABSTRACT:
Provided are an aliphatic polyester carbonate having biodegradability and having a content of carbonate unit of at least 5 mol %, a weight-average molecular weight of at least 100,000, a melt viscosity of 2,000-50,000 poises at 190.degree. C. and under a load of 60 kg and a melting point of 70.degree.-180.degree. C., and a process for producing said aliphatic polyester carbonate which comprises reacting an aliphatic dihydroxy compound with an aliphatic dibasic acid in the presence of an ester exchange catalyst to obtain an oligomer and then reacting the oligomer with a diaryl carbonate in the presence of the ester exchange catalyst. A phosphorus compound may be added to the aliphatic polyester carbonate for the purpose of stabilization.
REFERENCES:
patent: 4533728 (1985-08-01), Waniczek et al.
patent: 5294729 (1994-03-01), Wicks et al.
Patent Abstracts of Japan, publication No. JP7053693, "Aliphatic Polyester Carbonate", Mitsuo et al., Feb. 28, 1995, vol. 950, No. 2, Int. Cl. C08G63/64 and Chemical Abstracts, vol. 123, No. 16, 16 Oct. 1995, Abstract No. 199763.
Fujimori Takayasu
Isahaya Yoshinori
Kawai Ryozo
Miura Mitsuo
Nakamura Makoto
Acquah Samuel A.
Mitsubishi Gas Chemical Company Inc.
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