Kaneka Corporation

Keisuke Hatano

Fuminobu Kitayama

Nobuyoshi Maizuru

Yukihiro Shimamoto

Kouji Morita

Hideyuki Sakamoto

Yutaka Fujiwara

An object of the present invention is to provide an optical resin material and an optical film, which are very small in both orientation birefringence and photoelastic birefringence, excellent in transparency, have few defects due to foreign substances, and are excellent in heat resistance and mechanical strength. Provided is an optical resin material containing a graft copolymer (C) obtained by polymerizing a vinyl-based monomer mixture (B) in the presence of a vinyl-based polymer (A) having at least one crosslinked structure layer, wherein the graft copolymer (C) has an orientation birefringence of &#x2212;15&#xd7;10to 15&#xd7;10and a photoelastic constant of &#x2212;10&#xd7;10to 10&#xd7;10Pa.

Optical resin material and optical film

An object of the present invention is to provide a resin material capable of producing a molded body having few defects due to foreign substances, having high mechanical strength, very small in both orientation birefringence and photoelastic birefringence, and having high transparency, and having high transparency even when such a resin material is stretched. Provided is a resin composition containing a resin (A) and a multilayer structure polymer (B), wherein the multilayer structure polymer (B) has a crosslinked polymer layer and a hard polymer layer, and the hard polymer layer has at least two different hard polymer layers, at least one of which is a hard polymer layer (C) opposite in sign of a photoelastic constant to that of the resin (A).

Resin composition and film thereof

Disclosed herein is a method of producing a film, the method being capable of suppressing formation of die lines in melt extrusion molding using a T die. A thermoplastic resin composition having a relaxation modulus of not less than 100 Pa and not more than 2,000 Pa is melted and kneaded, the relaxation modulus being measured under conditions of a temperature of 260&#xb0; C., distortion of 1%, and a relaxation time of 1 second, and extrusion molding of the thermoplastic resin composition using the T die is performed to form the film. The thermoplastic resin composition may contain an acrylic resin and a rubber particle.

Method of producing film

An object of the present invention is to provide an optical thermoplastic resin having excellent transparency and color tone, and also excellent heat stability, as well as being extremely low in both orientation birefringence and photoelastic birefringence; and a formed body made of said resin. This optical thermoplastic resin has a rate of reduction in melt viscosity of less than 20%, an orientation birefringence of &#x2212;1.7&#xd7;10to 1.7&#xd7;10, a photoelastic constant of &#x2212;2&#xd7;10to 2&#xd7;10Pa, and, when formed into a 2 mm-thick formed body, has a haze of 1% or less.

Optical thermoplastic resin and formed body

The present invention provides a resin material and a film made of the resin material, the resin material being able to form a molded body having high transparency, excellent mechanical strength, few foreign matter defects, excellent heat stability, excellent solvent resistance, and extremely good appearance. The resin material contains a thermoplastic resin (A) and a polymer (B) satisfying the following conditions. That is, the polymer (B) is a graft copolymer obtained by multistep polymerization, and at least one step of the multistep polymerization is polymerization of a monomer mixture containing: a (meth)acrylic monomer having a ring structure; and (meth)acrylic acid and/or its salt.

Resin material and film thereof

Disclosed herein is a non-birefringent resin material that is very small in both orientation birefringence and photoelastic birefringence, has high transparency, and is capable of providing a molded article having few foreign matter defects and a film made of such a material. The non-birefringent resin material contains a resin (A) and a polymer (B) and has an orientation birefringence of &#x2212;1.7&#xd7;10to 1.7&#xd7;10and a photoelastic constant of &#x2212;4&#xd7;10to 4&#xd7;10Pa.

Non-birefringent resin material and film

Provided are a fluorine-containing (meth)acrylic (co)polymer that scarcely generates gas when subjected to molding process, and is capable of supplying a molded body excellent in external appearance and transparency; a fluorine-containing (meth)acrylic resin film thereof; and a fluororesin laminated resin film having the same properties. The (co)polymer is a fluorine-containing (meth)acrylic (co)polymer obtained by polymerizing a monomer component including 100 to 70% by weight of a fluoroalkyl(meth)acrylate monomer, and 0 to 30% by weight of a different monomer copolymerizable therewith by effect of a radical polymerization initiator having a solubility in water of 0.1% or less by weight at 25 C, and having 8 to 14 carbon atoms.

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Osaka, Japan

Keisuke Hatano