Heat-shrinkable polyester label film and method for preparing thereof
AssigneeFar Eastern New Century Corporation
InventorsYi-Fen Chen, Yow-An Leu, Li-Ling Chang
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Abstract
Disclosed herein are a heat-shrinkable polyester label film and a preparation method thereof. The label film has a shrinkage force not lower than 5.5 N in at least one shrinkage direction after immersing the heat-shrinkable polyester label film in water at 55° C. for 30 seconds, and a heat shrinkage rate of not lower than 50% in the shrinkage direction after immersing the heat-shrinkable polyester label film in water at 55° C. for 240 seconds.
Claims20
A heat-shrinkable polyester label film, having:
- a shrinkage force of not lower than 5.5 N in at least one shrinkage direction after immersing the heat-shrinkable polyester label film in water at 55° C. for 30 seconds;
- and
- a heat shrinkage rate of not lower than 50% in the shrinkage direction after immersing the heat-shrinkable polyester label film in water at 55° C. for 240 seconds.
A heat-shrinkable polyester label film comprising a polyester material made of a polyester-forming composition which includes a dibasic carboxylic mixture and a diol mixture,
- wherein the heat-shrinkable polyester label film has a glass transition temperature ranging from 50° C. to 65° C., an enthalpy not greater than 15 J/g, and a shrinkage force not lower than 5.5 N in at least one shrinkage direction, after immersing the heat-shrinkable polyester label film in water at 55° C. for 30 seconds;
- wherein the dibasic carboxylic mixture includes a dibasic carboxylic compound and a chain hydrocarbon dicarboxylic acid compound, the dibasic carboxylic compound is one of terephthalic acid and dimethyl terephthalate, the chain hydrocarbon dicarboxylic acid compound being present in an amount greater than 0 mol % and not greater than 7 mol %, based on a total molar amount of the dibasic carboxylic mixture;
- and
- wherein the diol mixture includes ethylene glycol and a diol component that is free from ethylene glycol.
Dependencies are inferred from the claim text.