Mitsui Chemicals, Inc.

The School Corporation Kansai University

Michio Eriguchi

Haruo Inoue

Shigeo Nishikawa

Masaki Misumi

Kaoru Yorita

Eiichi Sugihara

Takanori Sueda

Tamio Kawasumi

Tomoya Matayoshi

Takayuki Watanabe

Hideo Amemiya

Kouzo Ichikawa

Yoko Shimada

Masahiro Takedachi

Kenichi Fujii

Kazuo Kohmura

Akira Uchiyama

Yoshiro Tajitsu

Yuichi Ito

Jun Kamada

Yuji Inatomi

Hiroshi Mori

Takashi Unezaki

Tomoyuki Okamura

Kaichiro Haruta

Hirofumi Zenkoh

Masataka Iwata

Satoshi Noma

Yuzo Nakamura

A foam body constituted of a 4-methyl-1-pentene-based polymer, in which one or more temperatures showing a maximum value of loss tangent (tan δ) of dynamic viscoelasticity, which is obtained by dynamic viscoelasticity measurement conducted under the conditions of a temperature increase rate of 4° C./min, a frequency of 1.59 Hz, and a distortion of 0.1%, exist in at least a range of 10° C. or higher and 100° C. or lower, and the maximum value of the loss tangent is 0.5 or more and 3.5 or less. Another aspect relates to a polyolefin-based foam sheet constituted of a 4-methyl-1-pentene-based polymer, in which the difference in Shore A hardness of at least one surface at different times is defined. A further aspect relates to a complex including a foam body constituted of a 4-methyl-1-pentene-based polymer and a member which is bonded to the foam body and is different from the foam body.

Foam body, polyolefin-based foam sheet, and complex

An electretized film of the present invention includes a cyclic olefin polymer, in which the electretized film is a non-porous film, and a piezoelectric constant din a thickness direction, which is measured by applying a pressing force to the electretized film in the thickness direction, under conditions of a load of 0.5 N, a dynamic load of &#xb1;0.25 N, a frequency of 110 Hz, a temperature of 23&#xb0; C., and a humidity of 50%, is equal to or more than 100 pC/N.

Electretized film and electronic device

Provided is an adhesive member including: a base material having an uneven shape on at least one surface; and a surface layer covering at least a portion of the surface having the uneven shape on the base material.

Adhesive member and production method for adhesive member

A resin foam having fine foam cells is provided at low cost. A method of producing the foam includes preparing a molten resin composition and continuous extrusion foaming of the molten resin composition. The molten resin composition is prepared by melting a resin mixture of resins (A) and (B) by dissolving a foaming agent into the resin mixture. Resins (A) and (B) respectively have appropriately selected glass transition temperatures and resin (B) particles of appropriate diameter are dispersed in resin (A).

Foam and production method of the same

Provided are a shape-retaining film which has excellent adhesion to inks and other functional layers while retaining high shape-retaining properties and a process for producing the shape-retaining film. The shape-retaining film comprises an ethylene homopolymer or an ethylene/a-olefin copolymer having a C3-6 a-olefin content less than 2 wt. %, the ethylene homopolymer or copolymer having a density of 950 kg/m3 or higher and a weight-average molecular weight (Mw)/number-average molecular weight (Mn) ratio of 5-20. The film has a tensile elasticity modulus of 6-50 GPa and has either an angle of recovery from 90 bending of 8 or less or an angle of recovery from 180 bending of 65 or less.

Shape-retaining film, process for producing same, laminate for packaging, packaging material and process for producing same, shape-retaining fiber, and anisotropic heat-conductive film

Disclosed is a film having polarization selectivity and diffusibility, and a means for easily producing the film. The polarizing diffuser film is composed of substantially one kind of crystalline resin having an intrinsic birefringence of not less than 0.1, has a total light transmittance to visible light of 50-90%, a transmission haze to visible light of 15-90% and a transition polarization degree to visible light of 20-90%.

Polarizing diffuser film, method for producing polarizing diffuser film, and liquid crystal display device comprising polarizing diffuser film

A process for injection-foaming a thermoplastic resin by using an injection molding machine with a two-stage-compression screw, injecting a physical foaming agent into the cylinder of the machine at a pressure lower than the storage pressure of the physical foaming agent, mixing it with a melted resin and expanding the volume of the cavity of the mold at the time of injection, and an injection molding machine and resin composition suitable therefore.

Molding machine for injection foaming

Process for injection foaming, and machine and composition therefore

This invention provides a method for stably adding a predetermined amount of supercritical carbon dioxide at a fixed delivery rate into a forming machine and also a process for producing an expanded thermoplastic resin product by making use of the addition method. Carbon dioxide is charged from a liquefied carbon dioxide cylinder (,) into a predetermined amount deliverable pump (,) while allowing the carbon dioxide to remain in a liquefied state. When the carbon dioxide is pressurized and delivered by the predetermined amount deliverable pump (,), a delivery pressure of the carbon dioxide is controlled at an optional pressure within a range of from a critical pressure (7.4 MPa) of carbon dioxide to 40 MPa to deliver the carbon dioxide without any fluctuation of the amount of the delivery by setting up the pressure of a pressure control valve (,). The carbon dioxide is heated to a critical temperature (31&deg; C.) of carbon dioxide or higher to convert it into supercritical carbon dioxide. This supercritical carbon dioxide is then added to a molten thermoplastic resin in the forming machine (,).

Addition method of supercritical carbon dioxide, and production process of expanded thermoplastic resin product by making use of the addition method

A process is provided for the production of expanded olefinic thermoplastic elastomer product having good external appearance, flexibility and heat resistance. This process features using, as raw materials, a particular olefinic thermoplastic elastomer and carbon dioxide as a blowing agent.

Process for the production of expanded olefinic thermoplastic elastomer products

Disclosed is a process for the production of an injection-expansion molded, thermoplastic resin product. The process comprises a gas dissolving step, a cooling step, a metering and injection step, and an expansion controlling step. Specifically, a thermoplastic resin is molten in a continuous plasticator (1), supercritical carbon dioxide and/or nitrogen is added as a blowing agent, and the blowing agent and the thermoplastic resin are formed into a mutually-dissolved state. The resultant molten resin composition is cooled within the plasticator while maintaining a pressure equal to or higher than a critical pressure of the blowing agent. The thus-cooled molten resin composition is metered by an injector (7) and is filled in a mold (8). An internal pressure of the mold is lowered beyond the critical pressure of the blowing agent to produce cell nuclei, whereby the cell diameter is controlled. The blowing agent is maintained in a supercritical state up to the metering and injection step.

Injection-expansion molded, thermoplastic resin product and production

A process for preparing an expanded product of a thermoplastic resin which includes a gas dissolving step of adding supercritical carbon dioxide and/or nitrogen as an blowing agent to a thermoplastic resin, and melting it in the thermoplastic resin, a cooling step of cooling the resulting molten resin composition under a pressure not less than a critical pressure of the blowing agent, a nuclei forming step of discharging the molten resin composition from a die to lower the pressure to a level not more than the critical pressure, and an expansion controlling step of cooling an expanded product of the thermoplastic resin to a level not more than a glass transition temperature or a crystallization temperature of the resin to control a cell diameter of the expanded product.

Growing community of inventors

Chiba, Japan

Michio Eriguchi