Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Treating polymer containing material or treating a solid...
Patent
1992-02-18
1993-06-15
Acquah, Samuel A.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Treating polymer containing material or treating a solid...
5283082, 5283084, 5283085, 528499, 528503, C08F 600
Patent
active
052199843
ABSTRACT:
According to the present invention, a process which comprises bringing polyethylene terephthalate having an intrinsic viscosity of at least 0.50 dl/g and a density of 1.38 g/cm.sup.3 or more into contact with water is provided.
In the water-treated polyethylene terephthalate obtained in the present invention, amounts of oligomers and acetaldehyde formed at the time of molding said polyethylene terephthalate into molded articles are small, and the contamination of the mold therewith is difficult to occur and further the contents of said molded articles does not change in flavor and fragrance.
REFERENCES:
patent: 4154920 (1979-05-01), Jabarin
patent: 4289874 (1981-09-01), Bockrath
patent: 4591629 (1986-05-01), El-Ghatta et al.
patent: 4609721 (1986-09-01), Kirshenbaum et al.
Patent Abstracts of Japan, vol. 9, No. 88, (C-276)(1311), Dec. 12, 1984.
Patent Abstracts of Japan, vol. 8, No. 110, (C-224), May 23, 1984.
Patent Abstracts of Japan, vol. 4, No. 42, (C-5)(524), Apr. 3, 1980.
Sakai Masayuki
Shiraki Shigemi
Tanaka Yasuhiro
Acquah Samuel A.
Mitsui Petrochemical Industries Ltd.
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