【発明の名称】透明ポリエステル容器及びその製造法

Japanese Patent JP2918616

B2

The transparent container is specifically obtained from polyester and is improved in transparency at high temperatures. It is useful for a cooking container to use in an oven. It is produced by melt-molding a copolyester resin comprising 75 to 98 molar % of repeating units of an ester of terephthalic acid with 1,4-butanediol with the balance mainly comprising repeating units of an ester of terephthalic acid with an alkylene oxide adduct of a bisphenol compound, rapidly cooling the molding to prepare a sheet having a low crystallinity, maturing the sheet at a temperature selected so as to meet a requirement represented by the following formula (1) to prepare a sheet satisfying a requirement represented by the following formula (2) and subjecting the sheet to thermoforming through the use of a cavity mold at a temperature falling within a range represented by the following formula (3): $wherein\; Ta\; is\; the\; maturing\; temperature\; (\; DEG\; C),\; Tb\; is\; the\; cavity\; mold\; temperature\; (\; DEG\; C),\; Tcc\; is\; the\; cold\; crystallization\; temperature\; (\; DEG\; C)\; of\; the\; resin\; as\; measured\; at\; a\; temperature\; rise\; rate\; of\; 10\; DEG\; C/min\; by\; differential\; thermal\; analysis\; according\; to\; JIS\; K7121,\; Tm\; is\; the\; melting\; point\; (\; DEG\; C)\; of\; the\; resin\; as\; measured\; at\; a\; temperature\; rise\; rate\; of\; 10\; DEG\; C/min\; by\; differential\; thermal\; analysis\; according\; to\; JIS\; K7121,\; and\; (\; DELTA\; Hcc)a\; is\; the\; quantity\; of\; heat\; (J/g)\; of\; cold\; crystallization\; of\; the\; sheet\; after\; maturing\; as\; measured\; at\; a\; temperature\; rise\; rate\; of\; 10\; DEG\; C/min\; by\; differential\; thermal\; analysis\; according\; to\; JIS\; S\; K7121.$

KAWAGUCHI KUNIAKI
NAKANE TOSHIO
KONUMA HIROAKI
KAGEYAMA YUKIHIKO
HIJIKATA KENJI

JP7776690A

July 12, 1999

March 27, 1990

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HORIPURASUCHITSUKUSU KK

B29B11/14; B29C51/00; B29C51/02; B29C51/42; B29D22/00; B65D1/00; C08G63/12; B29B11/10; C08G63/18; C08G63/672; B29K67/00; B29K105/32; B29L22/00; (IPC1-7): B29C51/42; B29B11/10; B29B11/14; B29C51/02; B65D1/09; C08G63/18

Furuya Kaoru

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