SK microworks Co., Ltd.

The embodiments provide a polyamide-imide-based film that comprises a polyamide-imide-based polymer and has an rSE value of 0.8 to 1.25 as represented by the following Equation 1, whereby it is excellent in adhesion to a hard coating layer and light resistance to a UV light source, a process for preparing the same, and a composite film and a display device comprising the same. <Equation 1> rSE=SE1/SE2 In Equation 1, SE1 is the surface energy (dyne/cm) of a first side of the film, and SE2 is the surface energy (dyne/cm) of a second side of the film.

An embodiment relates to: a biodegradable resin composition comprising a first resin containing a polylactic acid-based resin and a second resin containing a polyhydroxyalkanoate-based resin; a biodegradable film or biodegradable molded product comprising same; and a method for preparing same. The biodegradable film can be biaxially stretched and can simultaneously improve flexibility, barrier properties, and noise level, and thus can be applied to various fields such as high-quality, eco-friendly packaging materials.

A recycled PET film according to the present invention can have significantly low yellowing and color difference values compared to conventional recycled PET films due to the inclusion of a complementary colorant containing a glycerin-based compound, and at the same time satisfy breaking strength and thermal shrinkage levels to replace a new PET material.

The present invention may provide recycled chips having a significantly low melt resistivity and an excellent dispersivity for metallic compounds, and a recycled PET film made entirely of the recycled chips or at least 95% by weight thereof may exhibit the effects of the recycled chips through remarkable transparency, small difference in chromaticity, and a small number of pinholes or by preventing the formation of fracture holes.

A protective film includes a protective layer. The protective layer includes a polyether-block-amide copolymer resin. YI n is a yellowness index measured after irradiating the protective layer with UVB-313EL light at an intensity of 0.68 W/m 2 for n hours. The protective layer has a yellowness index deviation (dvY) of 2.5 or less, as defined by Equation (1): Equation (1): dvY = YI max - YI min wherein: YI max is the maximum value among the yellowness indices YI 0 , YI 24 , YI 48 , YI 72 , YI 144 , YI 216 , YI 312 , and YI 384 ; and YI min is the minimum value among the same set of yellowness indices. The film can exhibit excellent yellowing resistance and mechanical properties even when exposed to ultraviolet rays for a long period of time.

Embodiments relate to a multilayer film, a protective film, and a multilayer electronic device, wherein the multilayer film is flexible over a wide temperature range and has excellent and long-lasting optical properties. The multilayer film includes: a first layer having first side and second side; a second layer disposed on the first side of the first layer; and a third layer disposed under the second side of the first layer, wherein the first layer includes a first polymer resin, the first polymer resin includes a repeating unit S, the repeating unit S is an ether repeating unit or an ester repeating unit, and the difference in haze value before and after exposure to air for 168 hours is 1.2% or less.

The multilayer film according to an embodiment is of high applicability as a protective film and comprises: a first layer having one surface and other surface; and a second layer disposed on one surface of the first layer. The Shore D hardness measured on the surface of the second layer is 60 or higher, and the flexural modulus is 1300 MPa or lower. The multilayer film according to an embodiment is easily elongated on curved or bent surfaces, has excellent workability, superior impact absorption functionality, and excellent surface durability.

The method of producing a polyvinyl butyral resin of the present disclosure enable manufacture of a film of which yellow index is low and durability is enhanced, when a film for lamination is manufactured, by advancing acetalization reaction of a polyvinyl alcohol resin and a butanal in the presence of a hydroxy butyric acid.

The embodiments relate to a polyester film, and a laminate and a foldable display device comprising the same. As the polyester film has a yield elongation in a specific range, it can be excellent in folding characteristics, along with high surface hardness.

Embodiments provide: a method for manufacturing a composite film, the method comprising a laminating operation of extruding a raw material including a polyether block amide copolymer into a sheet form and coming the sheet into contact with a carrier film to obtain a laminate, and a winding operation of winding the laminate, to thereby complete the manufacture of a composite film comprising the laminate, wherein the laminating operation comprises coming the sheet into contact with the carrier film within 30 seconds from the start of the extrusion; and a composition film which is not separated even after 200,000 cycles of dynamic bending tests at a temperature of −40° C. with a curvature radius of 1.5 mm and a bending speed of 1 second per 1 time in accordance with IEC 62715-6-1 standard.