Provided is a method for manufacturing an LCP film for a circuit substrate capable of achieving an LCP film for a circuit substrate having a low coefficient of linear thermal expansion and excellent dimensional stability, without excessively impairing excellent basic performance possessed by the liquid crystal polyester, such as mechanical characteristics, electrical characteristics, and heat resistance. The method for manufacturing an LCP film for a circuit substrate at least comprising: a composition provision step of providing an LCP resin composition at least containing 100 parts by mass of a liquid crystal polyester and 1 to 20 parts by mass of a polyarylate; a film forming step of T-die melt-extruding the LCP resin composition to form a T-die melt-extruded LCP film having a coefficient of linear thermal expansion (α2) in a TD direction of 50 ppm/K or more; and a pressurizing and heating step of subjecting the T-die melt-extruded LCP film to pressure and heat treatment to obtain an LCP film for a circuit substrate having a coefficient of linear thermal expansion (α2) in the TD direction of 16.8±12 ppm/K.

A system including a polymeric sheet. The polymeric sheet comprises a base sheet having a first surface and a second surface opposite the first surface and a multiplicity of spaced rails projecting from the first surface of the base sheet. The rails comprise a stem portion attached to and substantially upright from the first surface of the base sheet and a top portion on the distal end of the stem opposite the base sheet. The top portion comprises a first surface opposite the base sheet and a second surface facing the first surface of the base sheet. Additionally, the rails have a length greater than the width of the stems. The first surface of the base sheet, the second surface of the top portion and the surface of the stem defines a cavity with walls, and an adhesive coated on at least a portion of the cavity wall.

A method of processing by controlling one or more beam characteristics of an optical beam may include: launching the optical beam into a first length of fiber having a first refractive-index profile (RIP); coupling the optical beam from the first length of fiber into a second length of fiber having a second RIP and one or more confinement regions; modifying the one or more beam characteristics of the optical beam in the first length of fiber, in the second length of fiber, or in the first and second lengths of fiber; confining the modified one or more beam characteristics of the optical beam within the one or more confinement regions of the second length of fiber; and/or generating an output beam, having the modified one or more beam characteristics of the optical beam, from the second length of fiber. The first RIP may differ from the second RIP.

A method of processing by controlling one or more beam characteristics of an optical beam may include: launching the optical beam into a first length of fiber having a first refractive-index profile (RIP); coupling the optical beam from the first length of fiber into a second length of fiber having a second RIP and one or more confinement regions; modifying the one or more beam characteristics of the optical beam in the first length of fiber, in the second length of fiber, or in the first and second lengths of fiber; confining the modified one or more beam characteristics of the optical beam within the one or more confinement regions of the second length of fiber; and/or generating an output beam, having the modified one or more beam characteristics of the optical beam, from the second length of fiber. The first RIP may differ from the second RIP.

The present invention aims to provide a heat-shrinkable polyester film roll having decreased generation of wrinkles or longitudinal shrink mark. The present invention provides a film roll of a heat shrinkable polyester film, wherein a polyester of the polyester film contains recycled raw material from a PET bottle and an acid component of the polyester comprises isophthalic acid, and the film roll satisfies a specific average value of a shrinkage, specific isophthalic acid ratio, and specific thickness unevenness.

The present invention aims to provide a heat-shrinkable polyester film roll having decreased generation of wrinkles or longitudinal shrink mark. The present invention provides a film roll of a heat shrinkable polyester film, wherein a polyester of the polyester film contains recycled raw material from a PET bottle and an acid component of the polyester comprises isophthalic acid, and the film roll satisfies a specific average value of a shrinkage, specific isophthalic acid ratio, and specific thickness unevenness.

A crosslinked polyolefin separator having a ratio (A/B) of storage modulus G′ (A) to loss modulus G″ (B) of 2 or more, at a range of the frequency of the crosslinked polyolefin separator of 1 rad/s or less, in the frequency-loss/storage modulus curve. The crosslinked polyolefin separator is controlled to have a high ratio of storage modulus to loss modulus, and thus maintains its elasticity even at high temperature. Therefore, it is possible to provide a separator having improved safety.

A crosslinked polyolefin separator having a ratio (A/B) of storage modulus G′ (A) to loss modulus G″ (B) of 2 or more, at a range of the frequency of the crosslinked polyolefin separator of 1 rad/s or less, in the frequency-loss/storage modulus curve. The crosslinked polyolefin separator is controlled to have a high ratio of storage modulus to loss modulus, and thus maintains its elasticity even at high temperature. Therefore, it is possible to provide a separator having improved safety.

The invention provides a biaxially oriented polyester film having excellent impact strength and heat resistance and a method for producing same. The method comprises (A) melt-extruding a composition comprising polyester resin for which Tc−(Tg+Tm)/2 is 25−30° C. to obtain unstretched polyester resin composition sheet, which (B) is heated at Tg+5 (° C.) to Tg+40 (° C.) of the polyester resin and stretched in the machine direction at 2×-6× to obtain uniaxially oriented polyester resin composition film, which (C) is heated at Tc−46 (° C.) to Tc+25 (° C.) of the polyester resin and stretched in the transverse direction at 4×−8× to obtain biaxially oriented polyester resin composition film, which (D) undergoes relaxation at 3%-20% in the transverse direction as heated at Tm−40 (° C.) to Tm−5 (° C.) of the polyester resin.

The invention provides a biaxially oriented polyester film having excellent impact strength and heat resistance and a method for producing same. The method comprises (A) melt-extruding a composition comprising polyester resin for which Tc−(Tg+Tm)/2 is 25−30° C. to obtain unstretched polyester resin composition sheet, which (B) is heated at Tg+5 (° C.) to Tg+40 (° C.) of the polyester resin and stretched in the machine direction at 2×-6× to obtain uniaxially oriented polyester resin composition film, which (C) is heated at Tc−46 (° C.) to Tc+25 (° C.) of the polyester resin and stretched in the transverse direction at 4×−8× to obtain biaxially oriented polyester resin composition film, which (D) undergoes relaxation at 3%-20% in the transverse direction as heated at Tm−40 (° C.) to Tm−5 (° C.) of the polyester resin.