Provided is a polyester film for a touchscreen module substrate of a foldable display which is free of occurrence of a crack at a folding portion thereof, in order to provide a foldable display excellent in mass productivity, and free of a risk of causing distortion in an image displayed at a folding portion thereof after being repeatedly folded. The polyester film for a touchscreen module substrate of a foldable display satisfies the following conditions: (1) a refractive index in a bending direction is from 1.590 to 1.620; (2) a refractive index in a folding portion direction is from 1.670 to 1.700; (3) a refractive index in a thickness direction is 1.520 or less; and (4) a density is 1.380 g/cm or more, wherein the bending direction refers to a direction orthogonal to a folding portion of the polyester film at a time when the polyester film is folded.

Embodiments herein relate to a polymer film comprising an anti-blushing composition in a blend comprising polyethylene terephthalate (PET) and polybutylene terephthalate (PBT); wherein the blend has an intrinsic viscosity above 0.75 and contains at least 50 wt. % of PBT; wherein the anti-blushing composition comprises a phosphorus containing compound but excludes certain phosphorus compounds; and wherein the anti-blushing composition is configured to prevent blushing in the polymer film laminated directly to a metal sheet and exposed to steam at a temperature of 260° F. for 90 minutes.

The invention provides a biaxially oriented polypropylene film with a storage elastic modulus (E′-23) of at least 2.0 GPa in a longitudinal direction and at least 6.0 GPa in a width direction, a storage elastic modulus E′ (E′-80) of at least 1.0 GPa in the longitudinal direction and at least 3.0 GPa in the width direction, a ratio (E′-80/E′-23) of E′-80 to E′-23 of at least 0.4 in both the longitudinal direction and the width direction, a heat shrinkage rate at 150° C. of not higher than 10% in the longitudinal direction and not higher than 30% in the width direction, a heat shrinkage rate at 120° C. of not higher than 2.0% in the longitudinal direction and not higher than 5.0% in the width direction, and a heat shrinkage rate at 120° C. in the longitudinal direction that is lower than the heat shrinkage rate at 120° C. in the width direction.

The present disclosure is directed to a film formulation that resulted in a substantially non-migratory cold seal release film with improved blocking resistance. Specifically, the multilayered biaxially oriented polypropylene film can include a core layer of polypropylene homopolymer; a first outer layer on one side of the core layer that can be suitable for sealing, printing, or coating; and a second outer layer on the opposite side of the core layer that is a blocking resistant layer comprising thermoplastic polymers which reduce blocking tendency.

The present disclosure is directed to a film formulation that resulted in a substantially non-migratory cold seal release film with improved blocking resistance. Specifically, the multilayered biaxially oriented polypropylene film can include a core layer of polypropylene homopolymer; a first outer layer on one side of the core layer that can be suitable for sealing, printing, or coating; and a second outer layer on the opposite side of the core layer that is a blocking resistant layer comprising thermoplastic polymers which reduce blocking tendency.

The present invention relates to a polymer comprising moieties derived from ethylene and moieties derived from 1-hexene, wherein the polymer has: (a) a density of ≥910 and ≤930 kg/m.sup.3 as determined in accordance with ASTM D1505 (2010); (b) a melt mass-flow rate of ≥0.5 and ≤5.0 g/10 min, as determined in accordance with ASTM D1238 (2013) at a temperature of 190° C. under a load of 2.16 kg; (c) a fraction that is not eluted in analytical temperature rising elution fractionation (a-TREF) at a temperature >30.0° C. of ≥8.0 wt %, with regard to the total weight of the polymer; and (d) a fraction eluted in a-TREF at a temperature >94.0° C. of ≥20.0 wt %, with regard to the total weight of the polymer. Such polymer allows for the production of bi-directionally oriented films having a particularly desirable ability to be stretched at a high stretching ratio, in both the machine direction and in the transverse direction, and particularly to be stretched to a high stretching ratio in the machine direction and the transverse direction combined. Further this polymer allows for production of bi-directionally oriented films within a particularly and desirably broad temperature range in which the stretching can be performed without imparting any deficiencies of hampering the film production processes in continuous film production.

The present invention relates to a biaxially oriented polyester reflective film capable of retaining excellent reflection characteristics even after vacuum compression molding and hot press molding by suppressing deformation of an internal porous layer of the reflective film during molding, and a process of producing the same.

The present disclosure is directed to a film formulation that resulted in a substantially non-migratory cold seal release film with improved blocking resistance. Specifically, the multilayered biaxially oriented polypropylene film can include a core layer of polypropylene homopolymer; a first outer layer on one side of the core layer that can be suitable for sealing, printing, or coating; and a second outer layer on the opposite side of the core layer that is a blocking resistant layer comprising thermoplastic polymers which reduce blocking tendency.

The present disclosure relates to a process for producing bi-axially oriented polyester (BOPET) film from the recycled polyethylene terephthalate (RPET) granules. The process involves preparing recycled PET (RPET) granules form post-consumer recycled PET (PCR PET) by depolymerization and polycondensation followed by preparing the biaxially oriented polyethylene terephthalate (BOPET) film having recycled polyethylene terephthalate (RPET) up to 100%. The bi-axially oriented polyester film has good elongation, mechanical and/or thermal properties and are similar in quality to virgin PET films useful in high end food and pharma packaging and industrial applications.

To provide a biaxially-oriented polyester film roll that is excellent in transparency and heat resistance and has less defects. A biaxially oriented polyester film roll of the present invention characterized by satisfying requirements (1) a winding length of the film roll, (2) a width of the film roll, (3) an average hardness of an outermost surface layer of the polyester film roll, (4) a variation in hardness, (5) a thickness of a polyester film of the polyester film roll, and (6) an irregularity of thickness in the maximum concave portion.