Polyester, process for producing the same and molding product therefrom
AssigneeMitsubishi Chemical Corporation
InventorsHideko Akai, Katsuji Tanaka, Masahiko Fujimoto, Noboru Sato
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Abstract
A polyester comprises a dicarboxylic acid moiety comprising terephthalic acid or its ester forming derivative and a diol moiety comprising ethylene glycol and 1,4-cyclohexanedimethanol of 10 to 60 mol % based on the whole diol moiety, the intrinsic viscosity of the polyester being 0.68 to 0.95 dl/g, the "b" value of color tone of the produced pellets of polyester being -5 to 5, the number of the carboxylic acid terminals being not more than 30 eq/ton, and the sum of the numbers of the vinyl terminals, the vinylidene terminals and the methylcyclohexene terminals being not more than 25 eq/ton.
Claims18
A polyester comprising a dicarboxylic acid moiety comprising terephthalic acid or its ester forming derivative and a diol moiety comprising ethylene glycol and 1,4-cyclohexanedimethanol of 10 to 60 mol % based on the whole diol moiety;
- the intrinsic viscosity of the polyester being 0.68 to 0.95 dl/g, the "b" value of color tone of the produced pellets of polyester being -5 to 5, the number of the carboxylic acid terminals being not more than 30 eq/ton, and the sum of the numbers of the vinyl terminals represented by the following formula (1), the vinylidene terminals represented by the following formula (2) and the methylcyclohexene terminals represented by the following formula (3) being not more than 25 eq/ton. ##STR3##
A process for producing a polyester, which comprises carrying out an ester exchange reaction among dimethyl terephthalate, ethylene glycol and 1,4-cyclohexanedimethanol of an amount of 10 to 60 mol % based on the whole diol moiety in the presence of a tetravalent titanium compound, and
- after completing the ester exchange reaction, adding a phosphorus compound, a cobalt compound, and a germanium compound, an antimony compound or a mixture of the germanium compound and the antimony compound to carry out a polycondensation reaction with the final reaction temperature set at 240.degree. to 280.degree. C.
Dependencies are inferred from the claim text.