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Film formed from polyethylene-2,6-naphthalate resin, process for producing said film and package using said film
| Details |
Inventors: Mori, Shinichiro; Sasada, Katsuhiko; Hasegawa, Kayo; Harada, Yasuhiro; Kumaki, Chikao; Yamaguchi, Masahisa; Suzuura, Yasuki; Yamashita, Rikiya; Suzuki, Toshiyuki; Inoue, Isao;
Assignee: NKK Corporation (JP); DAI Nippon Printing Co., Ltd. (JP)
Primary Examiner: Acquah; Samuel A.
Assistant Examiner:
Attorney, Agent or Firm: Parkhurst & Wendel, L.L.P
The present invention relates to a polyethylene-2,6-naphthalate film comprising a resin composed mainly of polyethylene-2,6-naphthalate and having an intrinsic viscosity .eta. in the range of from 0.31 to 0.6, said film having stretch ratios of 1 to 3 times and 1 to 3 times or 3 to 6 times and 1 to 1.8 times respectively in substantially mutually perpendicular directions and a thickness in the range of from 5 to 150 .mu.m; a polyethylene-2,6-naphthalate resin comprising a blend composed mainly of two components of: a polyethylene-2,6-naphthalate resin having an intrinsic viscosity in the range of from 0.3 to 0.5 dl/g and prepared by an esterification reaction of a dicarboxylic acid having a 2,6-naphthalenedicarboxylic acid content of not less than 90% by mole with a glycol having an ethylene glycol content of not less than 90% by mole, or a transesterification and a polyethylene-2,6-naphthalate resin having an intrinsic viscosity in the range of from 0.5 to 0.7 dl/g and prepared by an esterification reaction of a dicarboxylic acid having a 2,6-naphthalenedicarboxylic acid content of not less than 90% by mole with a glycol having an ethylene glycol content of not less than 90% by mole, or a transesterification, the resin blend having an intrinsic viscosity in the range of from 0.31 to 0.68 dl/g; a modified polyethylene-2,6-naphthalate resin prepared by an esterification reaction of a dicarboxylic acid having a 2,6-naphthalenedicarboxylic acid content of not less than 90% by mole with a hydroxy compound having an ethylene glycol content in the range of from 90 to 99.5% by mole and a content of a compound having three or more ester forming functional groups in the range of from 0.5 to 5% by mole, or a transesterification; and packaging films or packs produced from these resins. |
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DETAILED DESCRIPTION We claim: 1.
A polyethylene-2,6-naphthalate resin comprising a blend composed mainly of two components of: a polyethylene-2,6-naphthalate resin comprising a skeleton derived from an acid moiety with not less than 90% by mole of the skeleton being 2,6-naphthalenedicarboxylic acid and a skeleton derived from a hydroxy moiety with not less than 90% by mole of the skeleton being an ethylenedioxy group, said polyethylene-2,6-naphthalate resin having an intrinsic viscosity in the range of from 0.
3 to 0.
5 dl/g; and a polyethylene-2,6-naphthalate resin comprising a skeleton derived from an acid moiety with not less than 90% by mole of the skeleton being 2,6-naphthalenedicarboxylic acid and a skeleton derived from a hydroxy moiety with not less than 90% by mole of the skeleton being an ethylenedioxy group, said polyethylene-2,6-naphthalate resin having an intrinsic viscosity in the range of from 0.
5 to 0.
7 dl/g; said resin blend having an intrinsic viscosity in the range of from 0.
31 to 0.
68 dl/g.
2.
The polyethylene-2,6-naphthalate resin according to claim 1, wherein the blending ratio (on a weight basis) of the former polyethylene-2,6-naphthalate resin to the latter polyethylene-2,6-naphthalate resin is in the range of from 5:95 to 95:5.
3.
The polyethylene-2,6-naphthalate resin according to claim 1, wherein the degree of dispersion of said resin blend is in the range of from 2.
8 to 5.
4.
A polyethylene-2,6-naphthalate film comprising a resin blend according to claim 1 and having an intrinsic viscosity in the range of from 0.
31 to 0.
68 dl/g.
5.
A modified polyethylene-2-,6-naphthalate resin comprising a polyethylene-2,6-naphthalate resin having a skeleton derived from an acid moiety with not less than 90% by mole of the skeleton being a 2,6-naphthalenedicarbonyl group and a skeleton derived from a hydroxy moiety with 90 to 99.
5% by mole of the skeleton being ethylene glycol and 0.
5 to 5% by mole of the skeleton being a hydroxy compound having three or more ester forming functional groups
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