Heat shrinkable film composition comprising polyethyleneterephtalate resin and polyester based copolymer, and heat shrinkable film

Abstract

There is provided a composition for forming a heat shrinkable film capable of providing a heat shrinkable film capable of having an excellent shrinkage rate and being heat-shrunk at a low temperature. The composition for forming a heat shrinkable film includes a polyethylene terephthalate (PET) resin having an inherent viscosity of 0.50 to 1.2 dl/g; and a polyester based copolymer including 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.

What is claimed is: 
     
         1 . A composition for forming a heat shrinkable film, the composition comprising:
 a polyethylene terephthalate (PET) resin having an inherent viscosity of 0.50 to 1.2 dl/g; and   a polyester based copolymer including 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 composition of  claim 1 , wherein the polyester based copolymer has an inherent viscosity of 0.60 to 0.90 dl/g. 
     
     
         3 . The composition of  claim 1 , wherein the polyethylene terephthalate (PET) resin is included at a content of 1 to 99 mol %, and the polyester based copolymer is included at a content of 1 to 99 mol %. 
     
     
         4 . The composition of  claim 1 , wherein the diol-derived residue further includes a residue derived from one or more other diols selected from a group consisting of 1,4-cyclohexane dimethanol, 1,2-propanediol, 1,3-propanediol, 1,4-butanediol, 2,2-dimethyl-1,3-propanediol, 1,6-hexanediol, 1,2-cyclohexanediol, 1,4-cyclohexanediol, 1,2-cyclohexane dimethanol, 1,3-cyclohexane dimethanol, 2,2-dimethylpropane-1,3-diol (neopentyl glycol), ethylene glycol, and diethylene glycol. 
     
     
         5 . The composition of  claim 4 , wherein a content of the diol-derived residues of the residue derived from 4-(hydroxymethyl)cyclohexylmethyl 4′-(hydroxymethyl)cyclohexane carboxylate, the residue derived from 4,4-(oxybis(methylene)bis)cyclohexane methanol, and other diol-derived residues is 10 to 80 mol % based on 100 mol % of the dicarboxylic acid. 
     
     
         6 . The composition 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. 
     
     
         7 . The composition of  claim 1 , wherein the polyester based copolymer is prepared by reacting the dicarboxylic acid including the aromatic dicarboxylic acid with the diol including 4-(hydroxymethyl)cyclohexylmethyl 4′-(hydroxymethyl)cyclohexane carboxylate represented by Chemical Formula 1 and 4,4-(oxybis(methylene)bis)cyclohexane methanol represented by Chemical Formula 2 to perform an esterification reaction and an polycondensation reaction. 
     
     
         8 . The composition of  claim 7 , 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. 
     
     
         9 . The composition of  claim 7 , wherein in the polycondensation reaction, additives including a polycondensation catalyst, a stabilizer, and a coloring agent are used. 
     
     
         10 . The composition of  claim 7 , 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. 
     
     
         11 . A method for preparing a heat shrinkable film comprising: injecting and extruding the composition of  claim 1  to draw the extruded product. 
     
     
         12 . A heat shrinkable film comprising:
 a polyethylene terephthalate (PET) resin having an inherent viscosity of 0.50 to 1.2 dl/g; and   a polyester based copolymer including 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: