Back to results
US 12,428,531 B2Granted
Polyester-based shrink film
AssigneesC.I. Takiron Corporation, Bonset America Corporation
InventorsTakuma Kaneko, Yuichiro Kanzaka, Shuuta Yuge, Tatsuya Irifune, Masanao Miyoshi
Life of this patent
Estimating the term…
Abstract
Provided is a polyester-based shrink film having excellent predetermined impact resistance and having a uniform shrinkage ratio near the shrinking temperature.
Claims20
A polyester-based shrink film comprising at least 90 weight % of a non-crystalline polyester resin being a mixture of a non-crystalline polyester resin and a crystalline polyester resin, the film including at least 90 weight % of the non-crystalline polyester resin based on the total amount of resins,
- where the crystalline polyester resin being one or more selected from polyethylene terephthalate, polyethylene naphthalate, polybutylene terephthalate, polybutylene naphthalate, and polypropylene terephthalate,
- where the non-crystalline resin being one or more of:
- non-crystalline polyester resins formed from a dicarboxylic acid comprising at least 80 mol % of terephthalic acid;
- and diols comprising 50 mol % to 80 mol % of ethylene glycol and 20 mol % to 50 mol % of one or more diols selected from 1,4-cyclohexanedimethanol, neopentyl glycol, and diethylene glycol,
- where the film satisfying the following configurations (a) to (c):
- (a) an impact resistance strength before shrinking as measured by means of a pendulum-type film impact tester is designated as A1, and A1 is set to a value within a range of 20 to 60 J/mm;
- (b) an impact resistance strength measured by means of a pendulum-type film impact tester after having been shrunk by 10% in hot water at 80° C. is designated as A2, a numerical value represented by A2/A1×100 is set to a value within a range of 60% to 110%;
- and
- (c) a shrinkage ratio in a case of having been shrunk in hot water at 80° C. under the conditions of 10 seconds is designated as B1, and a shrinkage ratio in a case of having been shrunk in hot water at 90° C. under the conditions of 10 seconds is designated as B2, a numerical value represented by B1/B2×100 is set to a value within a range of 70 to 90%.
6 more elements
A polyester-based shrink film comprising at least 90 weight % of a non-crystalline polyester resin based on the total amount of resins,
- where the non-crystalline polyester resin being formed from a dicarboxylic acid comprising at least 80 mol % of terephthalic acid;
- and diols consisting of 60 to 80 mol % ethylene glycol and 20 mol % to 40 mol % of neopentyl glycol, and diethylene glycol, an amount diethylene glycol being 5 mol % or less,
- where the film satisfying the following configurations (a) to (c):
- (a) an impact resistance strength before shrinking as measured by means of a pendulum-type film impact tester is designated as A1, and A1 is set to a value within a range of 20 to 60 J/mm;
- (b) an impact resistance strength measured by means of a pendulum-type film impact tester after having been shrunk by 10% in hot water at 80° C. is designated as A2, a numerical value represented by A2/A1×100 is set to a value within a range of 60% to 110%;
- and
- (c) a shrinkage ratio in a case of having been shrunk in hot water at 80° C. under the conditions of 10 seconds is designated as B1, and a shrinkage ratio in a case of having been shrunk in hot water at 90° C. under the conditions of 10 seconds is designated as B2, a numerical value represented by B1/B2×100 is set to a value within a range of 70 to 90%.
4 more elements
A polyester-based shrink film comprising at least 90 weight % of a non-crystalline polyester resin based on the total amount of resins,
- where the non-crystalline polyester resin being formed from a dicarboxylic acid comprising at least 80 mol % of terephthalic acid;
- and diols consisting of 70 mol % to 80 mol % ethylene glycol and 20 mol % to 30 mol % of 1,4-cyclohexanedimethanol, and diethylene glycol,
- where the film satisfying the following configurations (a) to (c):
- (a) an impact resistance strength before shrinking as measured by means of a pendulum-type film impact tester is designated as A1, and A1 is set to a value within a range of 20 to 60 J/mm;
- (b) an impact resistance strength measured by means of a pendulum-type film impact tester after having been shrunk by 10% in hot water at 80° C. is designated as A2, a numerical value represented by A2/A1×100 is set to a value within a range of 60% to 110%;
- and
- (c) a shrinkage ratio in a case of having been shrunk in hot water at 80° C. under the conditions of 10 seconds is designated as B1, and a shrinkage ratio in a case of having been shrunk in hot water at 90° C. under the conditions of 10 seconds is designated as B2, a numerical value represented by B1/B2×100 is set to a value within a range of 70 to 90%.
4 more elements
Dependencies are inferred from the claim text.