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AssigneeMitsubishi Gas Chemical Company, Inc.
InventorsMasahiko Takashima, Koji Yamamoto, Hiroyuki Nanba
Estimating the term…
The polyester-based resin composition of the present invention comprises a melt blend (C) consisting of a polyamide resin (A) and a polyester resin (B). The polyester-based resin composition satisfies the following formulas 1 and 2: P×C/100≦25 (1) Y/X××100≧90 (2) wherein P is a concentration, ppm, of a phosphorus compound in the polyamide resin (A) in terms of phosphorus atom; C is a content, % by mass, of the polyamide resin (A) in the melt blend (C); X is a lightness of a 2-mm thick plate which is molded only from the polyester resin (B); and Y is a lightness of a 2-mm thick plate which is molded from the melt blend (C). By regulating the phosphorus concentration and the polyamide resin (A) content so as to meet the limitation of formula 1, the polyester-based resin composition and a shaped article or packaging container made thereof are effectively prevented from the darkening due to the deposition of antimony metal despite the blending of a polyamide resin, thereby attaining a high clearness as defined by formula 2.
A polyester-based resin composition comprising a melt blend (C) consisting of 3 to 40% by mass of a polyamide resin (A) which is prepared by a polycondensation of a diamine component containing 70 mol % or more of m-xylylene diamine and a dicarboxylic acid component containing 70 mol % or more of adipic acid and 97 to 60% by mass of a polyester resin (B) which contains an antimony compound used as a polycondensation catalyst in an amount of 50 to 400 ppm in terms of antimony atom, the polyester-based resin composition satisfying the following formulas 1 and 2:
Dependencies are inferred from the claim text.