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US 11,993,706 B2Granted
Polyester film and preparation method therefor
AssigneeSK Chemicals Co., Ltd.
InventorsYoo Jin Lee, Da-Young Hwang
Life of this patent
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Abstract
The present disclosure relates to a polyester film and a preparation method of the same. Since the polyester film includes a resin layer formed from a polyester resin including a first diol moiety derived from isosorbide and a second diol moiety derived from cyclohexanedimethanol in a controlled ratio on at least one surface of a base layer, it is possible to exhibit excellent heat resistance and adhesion.
Claims16
A polyester film comprising:
- a base layer comprising a thermoplastic resin;
- and
- a resin layer located on at least one surface of the base layer, and formed from a polyester resin that has a structure in which an acid moiety derived from a dicarboxylic acid or a derivative thereof and a diol moiety derived from a diol are repeated and is characterized in that a content of a first diol moiety (a) derived from isosorbide and a content of a second diol moiety (b) derived from cyclohexanedimethanol with respect to 100 mol % of a total diol moiety derived from the diol satisfy the following Equation 1,
- wherein the polyester film is stretched in at least one of a longitudinal direction and a transverse direction, and
- when a thickness of the polyester film is 200 μm, Tan delta calculated according to the following Equation 2 is 100° C. or more, and Strain at 100° C. calculated according to the following Equation 3 is 3% or less:
- b
- ≤
- 18
-
-
- mol
-
-
- %
- -
- a
- [
- Equation
-
-
- 1
- ]
- in the above Equation 1, a is a content (mol %) of a first diol moiety derived from isosorbide and is 4 to 18 mol % with respect to 100 mol % of a total diol moiety derived from the diol in the polyester resin, and b is a content (mol %) of a second diol moiety derived from cyclohexanedimethanol,
- Tan
-
-
- delta
- =
- E
- ′
- /
- E
- ″
- [
- Equation
-
-
- 2
- ]
- in the above Equation 2, E′ and E″ are Young's modulus and loss modulus, respectively, measured using dynamic mechanical analysis under a fixed frequency and a temperature condition where the temperature increases at a rate of 3° C./min from room temperature up to 150° C.,
- Strain
-
-
- (
- %
- )
- =
- [
- (
- length
-
-
- of
-
-
- polyester
-
-
- film
-
-
- after
-
-
- stress
-
-
- application
-
-
- at
-
-
- 100
-
- °
-
-
- C
- .
- -
- length
-
-
- of
-
-
- polyester
-
-
- film
-
-
- before
-
-
- stress
-
-
- application
- )
- /
- length
-
-
- of
-
-
- polyester
-
-
- film
-
-
- before
-
-
- stress
-
-
- application
- ]
- ⨯
- 100
- [
- Equation
-
-
- 3
- ]
- in the above Equation 3, the length of polyester film after stress application and the length of polyester film before stress application are a length of the film deformed by a stress of 10 MPa applied at 100° C. under an isothermal condition for 10 minutes after increasing a temperature of the polyester film from room temperature according to a Creep TTS test and a length of the film before applying the stress, respectively.
128 more elements
Dependencies are inferred from the claim text.