Mitsui Petrochemical Industries, Ltd.

Yasuhiro Tanaka

Masayuki Sakai

Shigemi Shiraki

Kimiyoshi Miura

Hiroshi Koreishi

Process for producing polyethylene terephthalate

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.

Process for treatment of polyethylene terephthalate, polyethylene

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 flavour and fragrance.

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Kuga, Japan

Yasuhiro Tanaka