Jsp Corporation

Takeshi Aoki

Takashi Nishimoto

Ryohei Takeuchi

Satoshi Iwasaki

Yoshihisa Ishihara

Mikidai Fujita

Hisao Tokoro

Satoru Shioya

Naochika Kogure

Yoshiaki Momose

Hirotoshi Kakuta

Hiroyuki Gokuraku

Seiji Takahashi

Yoshinori Shimojo

Yasushi Terui

Kuninori Hirosawa

A laminated foam interleaf sheet for being interposed between glass plates, having a foam layer of a polyethylene-based resin, and an antistatic layer which is laminated on each of both sides of the foam layer and contains a polyethylene-based resin, a polystyrene-based resin and a polymeric antistatic agent, the laminated foam interleaf sheet having a surface roughness Ra of 30 &#x3bc;m or less.

Laminated foam interleaf sheet for glass plates

Provided is a method for producing a polyethylene-based resin extruded foam sheet by extruding and foaming a foamable molten resin composition formed by kneading a mixture containing a low-density polyethylene, a physical blowing agent, and an antistatic agent, wherein the foam sheet has a thickness in a range of from 0.05 to 0.5 mm, and the antistatic agent is a polymeric antistatic agent having a melting point whose different from the melting point of the low-density polyethylene is in a range of from &#x2212;10 to +10&#xb0; C., and having a melt flow rate of 10 g/10 min or more. This method enables a novel polyethylene-based resin extruded foam sheet to be obtained that is of high quality such that formation of a small hole or a through-hole has been reduced or eliminated, and has both excellent strength and a shock-absorbing property despite a very small thickness even in medium- or long-term continuous production, and besides, exhibits a sufficient antistatic property, thus suitable as a glass plate interleaf sheet.

Method for producing polyethylene-based resin extruded foam sheet, polyethylene-based resin extruded foam sheet, and plate interleaf sheet using the same for glass sheets

A multi-layer foam sheet with an apparent density of 30 to 300 kg/mand a thickness of 0.05 to 2 mm, including a foam layer containing a polyethylene-based resin, and an antistatic layer fusion-laminated by coextrusion on each of both sides of the foam layer. The antistatic layer has a basis weight of 1 to 10 g/mand contains a polyethylene-based resin, a polystyrene-based resin, a styrenic elastomer, and a polymeric antistatic agent, with the polystyrene-based resin being contained in the antistatic layer in an amount of 15 to 70% by weight.

Multilayer foam sheet and interleaf sheet for glass plates

A method for producing a polyethylene-based resin laminated foam sheet according to the present invention is a method for producing a polyethylene-based resin laminated foam sheetwith thickness of 0.05 to 0.5 mm in which an anti-static layer is adhered by lamination on at least one surface of the foam layer, including: a step of performing coextrusion and foaming of a laminate which is obtained by combining and laminating, in a die, a melt resin compositionfor forming a foam layer obtained by kneading a low density polyethylene A and a physical foaming agent and a melt resin compositionfor forming an anti-static layer obtained by kneading a low density polyethylene B and an anti-static agent, wherein the anti-static agent is a polymeric anti-static agent C which has a melting point to allow a melting point difference in the range of from &#x2212;10&#xb0; C. to +10&#xb0; C. compared to that of the low density polyethylene B and has a melt flow rate of 10 g/10 minutes or more.

Method for producing polyethylene-based resin laminated foam sheet, polyethylene-based resin laminated foam sheet, and interleaf for glass plate using thereof

A multi-layer foam sheet with an apparent density of 30 to 300 kg/mand a thickness of 0.05 to 2 mm, including a foam layer containing a polyethylene-based resin (A), and an antistatic layer fusion-laminated by coextrusion on each of both sides of the foam layer. The antistatic layer has a basis weight of 1 to 10 g/mand contains a polyethylene-based resin (B), a polystyrene-based resin, a styrenic elastomer, and a polymeric antistatic agent, with the polystyrene-based resin being contained in the antistatic layer in an amount of 15 to 70% by weight.

Multi-layer foam sheet and interleaf sheet for glass plates

An extruded foam sheet having a foam layer constituted of a base resin containing low density polyethylene as a major component thereof, wherein the foam sheet has an apparent density of 45 to 450 kg/m, an average thickness of 0.03 mm or more and less than 0.3 mm and a dimensional change of &#x2212;5% to 0% in the extrusion direction when heated at 80&#xb0; C. for 24 hours and wherein cell walls of the foam layer have an average thickness of 6 to 70 &#x3bc;m. The foam sheet may be used as an interleaf sheet for glass plates.

Extruded polyethylene-based resin foam sheet and interleaf sheet for glass plates

The present invention provides a speaker unit comprising a diaphragm of 0.5 to 10 mm thick aromatic polycarbonate with a density of 0.03 to 0.6 g/cm , and a mechanism for driving the diaphragm. The aromatic polycarbonate used for the diaphragm is preferably derived from bisphenol with a viscosity average molecular weight of 25,000 to 70,000. The invention further provides a speaker system comprising such a speaker unit attached to a cabinet and a method for manufacturing the speaker diaphragm.

Speaker unit, speaker system, and speaker diaphragm manufacturing method

A composite sheet having a first, foamed polycarbonate resin layer and a second, non-foamed polycarbonate resin layer provided on at least one surface of the first layer and having a melt tension of at least 2.45 cN at 250&deg; C.

Composite sheet having foamed polycarbonate resin layer and non-foamed polycarbonate resin layer

A composite material having a skin layer, an intermediate, cushioning layer provided on one side of the skin layer, and a backing layer provided on the cushioning layer, wherein the backing layer is made of a non-crosslinked polypropylene resin foam and having a melting point MB in the range of 130-170.degree. C., wherein the cushioning layer is a crosslinked polypropylene resin foamed sheet having a gel fraction of 20-70% by weight. The cushioning layer has an endothermic peak in DSC curve at a peak temperature of PC which is in the range of 130-170.degree. C. and which is not smaller than (MB-15).degree. C. but not greater than (MB+10).degree. C. The endothermic peak has such an area at temperatures higher than MB that corresponds to a calorific value in the range of 3-30 J/g. The backing layer may be formed by expansion molding of expanded polypropylene particles within a mold cavity in which a laminate of the skin layer and the cushioning layer is placed in position.

Composite material having polypropylene foam layer

A polycarbonate resin-containing composition is extruded through a die together with a blowing agent to produce a foamed body. The composition has a storage modulus G'.sub.A dyn/cm.sup.2 at a temperature of 250.degree. C. and an angular frequency of 0.1 rad/sec and a storage modulus G'.sub.B dyn/cm.sup.2 at a temperature of 250.degree. C. and an angular frequency of 10 rad/sec, wherein the storage modulus G'.sub.A and storage modulus G'.sub.B satisfy the following conditions:

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Nikko, Japan

Takeshi Aoki