A phase difference film layered body is obtained by stretching a film before stretching, the film before stretching including: a P1 layer formed of a resin p1 containing polyphenylene ether having a positive intrinsic birefringence value and a polystyrene-based polymer having a negative intrinsic birefringence value and having a syndiotactic structure; and a P2 layer disposed in contact with the P1 layer and formed of a resin p2 containing an acrylic resin or an alicyclic structure-containing polymer. In the resin p1, the weight ratio of (the content of the polyphenylene ether)/(the content of the polystyrene-based polymer) is 35/65 to 45/55. A method for producing the phase difference film layered body and a method for producing a phase difference film using the phase difference film layered body are also provided.

The present invention is directed to tamper-evident mesh material, methods of manufacture therefor, and tamper-evident bags manufactured therefrom. The tamper-evident mesh material of the present invention may be used, for example, in the manufacture of a variety of tamper-evident security bags for use in applications where it is desirable to detect any traces or evidence of tampering with or of unauthorized access to the contents of the bag.

A lengthy stretched film made of a thermoplastic resin, having, over the width direction of at least 1300 mm, a value of an orientation angle to a take-up direction in a range of 40 to 50 and fluctuation thereof of 1.0 or less, and a value of an average Nz coefficient in a range of 1.3 to 2.0 and fluctuation thereof of 0.10 or less. A lengthy circularly polarizing plate constituted by laminating the lengthy stretched film with a lengthy polarizer. A reflective display type liquid crystal display device provided with the circularly polarizing plate constituted by trimming the lengthy circularly polarizing plate to a desired size.

A stretched polyester film and a method for preparing the stretched polyester film are disclosed. The stretched polyester film contains a polyester resin in which a diol component and a dicarboxylic acid component are polymerized, wherein the heat shrinkage rate of the film at 80? C. in the main shrinkage direction is 40% or more, and, upon a first thermal treatment and a second thermal treatment, a first melting temperature (T.sub.m1) and a second melting temperature (T.sub.m2) appear when the film is analyzed by differential scanning calorimetry (DSC). The stretched polyester film has excellent heat shrinkability, along with an increased efficiency of a recycling process of waste plastic containers.

Provided is a method capable of producing a retardation film suppressed in biaxiality, having a small Nz coefficient, and having a slow axis in an oblique direction with high production efficiency. The production method for a retardation film of the present invention includes: holding left and right side edge portions of a film to be stretched with left and right variable pitch-type clips configured to have clip pitches changing in a longitudinal direction, respectively; preheating the film; reducing, under a state in which a position at which the clip pitch of the clips on one side out of the left and right clips starts to reduce and a position at which the clip pitch of the clips on another side starts to reduce are set to different positions in the longitudinal direction, the clip pitch of each of the clips to a predetermined pitch to subject the film to oblique stretching; and releasing the clips holding the film.

A phase difference plate including: a first layer which is formed from a resin having a positive intrinsic birefringence value, and has birefringence; and a second layer which is formed from a resin having a negative intrinsic birefringence value, and has birefringence, wherein a retardation Re(450) at a wavelength of 450 nm of the phase difference plate, a retardation Re(550) at a wavelength of 550 nm of the phase difference plate, and a thickness d of the phase difference plate satisfy formula (I) Re(450)/Re(550)<0.92 and formula (II) Re(550)/d>0.0035; and production method therefor.

An optical film includes: a polarization layer; a first phase retardation layer having an optic axis at an angle in a range from about 17 degrees to about 27 degrees or from about 27 degrees to about 17 degrees with respect to a transmission axis of the polarization layer; and a second phase retardation layer having an optic axis at an angle in a range from about 85 degrees to about 95 degrees with respect to the transmission axis of the polarization layer. The polarization layer, the first phase retardation layer, and the second phase retardation layer are deposited in sequence, the first phase retardation layer is a half-wave plate, the second phase retardation layer is a quarter-wave plate, and out-of-plane retardation values of the first phase retardation layer and the second phase retardation layer for incident light having the standard wavelength have opposite signs.

An optical-film wound body of a long-length optical film, formed by winding a substrate film/masking film stacked body with a length of 1,000 m or more, the substrate film/masking film stacked body being formed by stacking a substrate film and a masking film, wherein the masking film is formed of a material having a melting peak of 25 C. or higher and 70 C. or lower, and a peel strength of the substrate film with a polarizing plate at an inner wound portion and that at an outer wound portion satisfy a specific relationship; a method for storing the wound body; and a method for producing a substrate film/polarizing plate stacked body.

The present invention is directed to tamper-evident mesh material, methods of manufacture therefor, and tamper-evident bags manufactured therefrom. The tamper-evident mesh material of the present invention may be used, for example, in the manufacture of a variety of tamper-evident security bags for use in applications where it is desirable to detect any traces or evidence of tampering with or of unauthorized access to the contents of the bag.

A method for producing a stretched film comprising a first step of stretching a long film by increasing a holding distance in the width direction and a second step of shrinking by decreasing the holding distance in the width direction. One side edge of the long film has a traveling direction with at least three bending travels, while the other side edge has a traveling direction with at least two bending travels. The first step or the second step performs the bending travel at one or both of the side edges. The first step or the second step has a traveling trajectory in which the both side edges of the long film travel to the same side. The method achieves suppression of wrinkles formed on the stretched film, limitation of biaxiality of the stretched film, and provides a stretched film having optical properties suitably usable as a retardation plate.