Heat shrinkable film comprising polyester based copolymer

Patent metadata

Field	Value
Publication number	US-2016130414-A1
Application number	US-201414898566-A
Country	US
Kind code	A1
Filing date	Jun 16, 2014
Priority date	Jun 17, 2013
Publication date	May 12, 2016
Grant date	—

Abstract

There is provided a heat shrinkable film comprising a polyester based copolymer capable of having an excellent shrinkage rate and being heat shrunk at a low temperature. The heat shrinkable film according to an exemplary embodiment of the present invention includes a polyester based copolymer, wherein the polyester based copolymer includes: a dicarboxylic acid-derived residue including a residue derived from an aromatic dicarboxylic acid; and a diol-derived residue including a residue derived from 4-(hydroxymethyl)cyclohexylmethyl 4′-(hydroxymethyl)cyclohexane carboxylate represented by the following Chemical Formula 1 and a residue derived from 4,4-(oxybis(methylene)bis) cyclohexane methanol represented by the following Chemical Formula 2.

First claim

What is claimed is:

1 . A heat shrinkable film comprising a polyester based copolymer, wherein the polyester based copolymer includes:
a dicarboxylic acid-derived residue including a residue derived from an aromatic dicarboxylic acid, and a diol-derived residue including a residue derived from 4-(hydroxymethyl)cyclohexylmethyl 4′-(hydroxymethyl)cyclohexane carboxylate represented by the following Chemical Formula 1 and a residue derived from 4,4-(oxybis(methylene)bis) cyclohexane methanol represented by the following Chemical Formula 2.

2 . The heat shrinkable film of claim 1 , wherein the diol-derived residue further includes residues derived from 1,4-cyclohexane dimethanol, diethylene glycol, and ethylene glycol.

3 . The heat shrinkable film of claim 1 , wherein the aromatic dicarboxylic acid is one or more selected from a group consisting of terephthalic acid, dimethyl terephthalate, cyclic dicarboxylic acid, isophthalic acid, adipic acid, azelaic acid, naphthalenedicarboxylic acid, and succinic acid.

4 . The heat shrinkable film of claim 1 , wherein it has a shrinkage initiation temperature of 65 ° C. or less and a maximum heat shrinkage rate of 25% or more at 65° C.

5 . The heat shrinkable film of claim 1 , wherein it has a maximum heat shrinkage rate of 75% or more at 95° C.

6 . A method for preparing a heat shrinkable film, the method comprising:
preparing a polyester based copolymer by reacting a dicarboxylic acid including an aromatic dicarboxylic acid with a diol including 4-(hydroxymethyl)cyclohexylmethyl 4′-(hydroxymethyl)cyclohexane carboxylate represented by the following Chemical Formula 1 and 4,4-(oxybis(methylene)bis) cyclohexane methanol represented by the following Chemical Formula 2 to perform an esterification reaction and a polycondensation reaction; and extruding and drawing the polyester based copolymer.

7 . The method of claim 6 , wherein the diol further includes 1,4-cyclohexane dimethanol, diethylene glycol, and ethylene glycol.

8 . The method of claim 7 , wherein the diol includes 0.1 to 10 mol % of 4-(hydroxymethyl)cyclohexylmethyl 4′-(hydroxymethyl)cyclohexane carboxylate, 0.1 to 12 mol % of 4,4-(oxybis(methylene)bis) cyclohexane methanol, 0.1 to 15 mol % of 1,4-cyclohexane dimethanol, 2 to 15 mol % of diethylene glycol, and 48 to 97.7 mol % of ethylene glycol based on 100 mol % of the dicarboxylic acid.

9 . The method of claim 6 , wherein the esterification reaction is performed at a reaction temperature of 230 to 265° C. and a pressure of 1.0 to 3.0 kg/cm 2 for 100 to 300 minutes after injecting the diol at a molar ratio of 1.2 to 3.0 with respect to the dicarboxylic acid.

10 . The method of claim 6 , wherein in the esterification reaction or the polycondensation reaction, additives including a catalyst, a stabilizer, and a coloring agent are used.

11 . The method of claim 6 , wherein the polycondensation reaction is performed at a reaction temperature of 260 to 290° C. and a reduced pressure of 400 to 0.1 mmHg.

Assignees

• Sk Chemicals Co Ltd

Inventors

• Lim Seol-Hee
• Kim Sung-Gi
• Lee Ji Yea

Classifications

• C08J5/18 Primary

  Manufacture of films or sheets · CPC title

• B29C47/0004

  Operations & Transport · mapped topic

• B29C47/0021

  Operations & Transport · mapped topic

• B29K2067/04

  Polyesters derived from hydroxycarboxylic acids · CPC title

• C08J2367/02

  Polyesters derived from dicarboxylic acids and dihydroxy compounds; (C08J2367/06 takes precedence) · CPC title