Shrinkable polyester film
First Claim
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1. A shrinkable monoaxially stretched polyester film which consists essentially of a crystalline polyester and has a birefringence of 0.040 to 0.150, shrinkage of not less than 50% in one direction of either the machine direction or the transverse direction after 5 min treatment in an air oven at 100°
- C., shrinkage of not more than 15% in the other direction after 5 min treatment in an air oven at 100°
C., shrinkage of not less than 60% in one direction of either the machine direction or the transverse direction after 30 sec treatment in a warm water of 85°
C., shrinkage of not more than 15% in the other direction after 30 sec treatment in a warm water of 85°
C., and heat of fusion of not less than 2 cal/g, the crystalline polyester consisting essentially of a dicarboxylic acid component and a diol component, the dicarboxylic acid component of the crystalline polyester consisting essentially of terephthalic unit acid or terephthalic acid unit and isophthalic acid unit in the molar ratio of 50/50 to 95/5 and the diol component of the crystalline polyester consisting essentially of 50 to 97 mol % of ethylene glycol unit, 3 to 50 mol % of neopentyl glycol unit and 0 to 2 mol % of a unit selected from the group consisting of diethylene glycol unit and polyethylene glycol unit, the content of each diol unit being selected so that the sum thereof is 100 mol %.
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Abstract
A shrinkable polyester film having a sufficient shrinkage, a sufficient resistance to solvent for printing ink, a shrinking property not to cause wrinkles, a warm water resistance sufficient for preventing wrinkles, slack and whitening is disclosed herein.
The shrinkable polyester film of the present invention may be used as labels for various vessels such as glass bottle, heat-resistant PET bottle and non heat-resistant PET bottle.
45 Citations
13 Claims
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1. A shrinkable monoaxially stretched polyester film which consists essentially of a crystalline polyester and has a birefringence of 0.040 to 0.150, shrinkage of not less than 50% in one direction of either the machine direction or the transverse direction after 5 min treatment in an air oven at 100°
- C., shrinkage of not more than 15% in the other direction after 5 min treatment in an air oven at 100°
C., shrinkage of not less than 60% in one direction of either the machine direction or the transverse direction after 30 sec treatment in a warm water of 85°
C., shrinkage of not more than 15% in the other direction after 30 sec treatment in a warm water of 85°
C., and heat of fusion of not less than 2 cal/g, the crystalline polyester consisting essentially of a dicarboxylic acid component and a diol component, the dicarboxylic acid component of the crystalline polyester consisting essentially of terephthalic unit acid or terephthalic acid unit and isophthalic acid unit in the molar ratio of 50/50 to 95/5 and the diol component of the crystalline polyester consisting essentially of 50 to 97 mol % of ethylene glycol unit, 3 to 50 mol % of neopentyl glycol unit and 0 to 2 mol % of a unit selected from the group consisting of diethylene glycol unit and polyethylene glycol unit, the content of each diol unit being selected so that the sum thereof is 100 mol %. - View Dependent Claims (2, 3, 4, 5, 6, 7)
- C., shrinkage of not more than 15% in the other direction after 5 min treatment in an air oven at 100°
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8. A shrinkable monoaxially stretched polyester film which consists essentially of a crystalline polyester and has a shrinkage of not more than 30% in one direction of either the machine direction or the transverse direction after 5 sec treatment in a warm water at 75°
- C., a shrinkage of not more than 10% in the other direction after 5 see treatment in a warm water at 75°
C., and a specific (maximum) shrinkage (the neck-in rate) of not more than 20% in the other direction after 5 see treatment in a warm water at 75°
C., the crystalline polyester consisting essentially of a dicarboxylic acid component and a diol component, the dicarboxylic acid component of the crystalline polyester consisting essentially of terephthalic acid unit or terephthalic acid unit, and isophthalic acid unit in the molar ratio of 50/50 to 95/5 and the diol component of the crystalline polyester consisting essentially of 50 to 97 mol % of ethylene glycol unit, 3 to 50 mol % of neopentyl glycol unit and 0 to 2 mol % of a unit selected from the group consisting of diethyIene glycol unit and polyethylene glycol unit, the content of each diol unit being selected so that the sum thereof is 100 mol %. - View Dependent Claims (9)
- C., a shrinkage of not more than 10% in the other direction after 5 see treatment in a warm water at 75°
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10. A shrinkable monoaxially stretched polyester film which consists essentially of a crystalline polyester and has a shrinkage of not less than 30% in one direction of either the machine direction or the transverse direction after 5 min treatment in an air oven at 100°
- C., a shrinkage of not more than 10% in the other direction after 5 min treatment in an air oven at 100°
C., an elongation at break of 1 to 100% in the other direction, and a heat of fusion of not more than 8 cal/g, the crystalline polyester consisting essentially of a dicarboxylic acid treatment and a diol component, the dicarboxylic acid component of the crystalline polyester consisting essentially of terephthalic acid unit or terephthalic acid unit and isophthalic acid unit in the molar ratio of 50/50 to 95/5 and the diol component of the crystalline polyester consisting essentially of 50 to 97 mol % of ethylene glycol unit, 3 to 50 mol % of neopentyl glycol unit and 0 to 2 mol % of a unit selected from the group consisting of diethylene glycol unit and polyethylene glycol unit, the content of each diol unit being selected so that the sum thereof is 100 mol %. - View Dependent Claims (11, 12, 13)
- C., a shrinkage of not more than 10% in the other direction after 5 min treatment in an air oven at 100°
Specification