Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Patent
1996-05-17
1998-01-06
Yoon, Tae
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
528283, 528285, 5283083, 521 485, 523351, 264299, C08G 6385, C08G 6316, B29C 3900, C08J 320
Patent
active
057056013
ABSTRACT:
A process for producing a polyester film is disclosed, which comprises melt-mixing from 3 to 12 parts by weight of a master polymer comprising a poly(alkylene terephthalate) which contains from 0.3 to 3 wt % inorganic lubricant and has an intrinsic viscosity of 0.5 or higher with from 97 to 88 parts by weight of a poly(alkylene terephthalate) containing no inorganic lubricant and having an intrinsic viscosity of 0.5 or higher, and forming the resulting mixture into a film by the electrostatic casting method. The master polymer is obtained by a process comprising adding to a poly(alkylene terephthalate) oligomer having an average degree of polymerization of 10 or lower an alkylene glycol slurry of an inorganic lubricant and specific amounts of a potassium compound and a phosphorus compound, depolymerizing the oligomer, subsequently adding specific amounts of antimony trioxide and germanium dioxide, and then effecting polycondensation. By this process, a polyester film having an excellent color tone can be produced with a high producibility and a high operation efficiency.
REFERENCES:
patent: 3951886 (1976-04-01), Miyake et al.
patent: 4985538 (1991-01-01), Fukuda et al.
patent: 5451611 (1995-09-01), Chilukuri et al.
Matsumoto Tetsuo
Ueda Atsuko
Nippon Ester Co., Ltd.
Yoon Tae
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