Nitto-denko Corporation

Itsuhiro Hatanaka

Kazumichi Kato

Makoto Saitou

Fumika Kawatake

Kiyoaki Kodama

Keisuke Hirano

Takahiro Nonaka

Masahito Niwa

Taiki Shimokuri

Shou Takarada

Nobukazu Negishi

Mika Ikemura

Hiroaki Takahashi

Hiroki Fujii

Muneshige Nakagawa

Naomi Jintoku

Tetsurou Kobayashi

A PSA composition comprising a block copolymer of a monovinyl-substituted aromatic compound and a conjugated diene compound, a tackifier resin, and a softening agent is provided. The tackifier resin comprises a natural product-based tackifier resin (A) having a softening point higher than 80° C. and containing no aromatic ring, and a petroleum-based tackifier resin (B) having a softening point higher than 100° C. and containing an aromatic ring. The content of the tackifier resin (A) is 40 to 120 parts by weight, the content of the tackifier resin (B) is 5 to 40 parts by weight, the total amount of the tackifier resin is 60 to 160 parts by weight, and the content of the softening agent is 5 to 40 parts by weight with respect to 100 parts by weight of the block copolymer, with respect to 100 parts by weight of the block copolymer.

Pressure-sensitive adhesive composition and pressure-sensitive adhesive sheet

Provided is a hot-melt pressure-sensitive adhesive composition which enables to form a pressure-sensitive adhesive layer without allowing the progression of rapid gelation at the time of heating and melting. The pressure-sensitive adhesive composition provided by the present invention is a solvent-free hot-melt pressure-sensitive adhesive composition. The pressure-sensitive adhesive composition includes a base polymer, an isocyanate crosslinking agent, and a tackifier T which is a reaction product of a compound X and a compound Y. A content of the tackifier T with respect to 100 parts by weight of the base polymer is 20 parts by weight or more and 40 parts by weight or less.

Hot-melt pressure-sensitive adhesive composition and hot-melt pressure-sensitive adhesive sheet

The pressure sensitive adhesive sheet is a sheet shaped pressure sensitive adhesive including an acryl-based base polymer. The acryl-based base polymer contains an acryl-based segment and a urethane-based segment, and a content of the urethane-based segment is 3 to 30 parts by weight based on 100 parts by weight of the acryl-based segment. The urethane-based segment includes at least one urethane chain selected from the group consisting of a polyether urethane and a polyester urethane. The content of the urethane-based segment other than the polyether urethane-based segment is 15 parts by weight or less based on 100 parts by weight of the acryl-based segment.

Pressure sensitive adhesive sheet, method for manufacturing thereof, and pressure sensitive adhesive film

A pressure sensitive adhesive includes an acryl-based base polymer. The acryl-based base polymer contains an acryl-based segment and a urethane-based segment. In the acryl-based base polymer, the content of the urethane-based segment is 3 to 20 parts by weight based on 100 parts by weight of the acryl-based segment. A pressure sensitive adhesive sheet can be obtained by applying a pressure sensitive adhesive composition on a substrate in a layer form. The pressure sensitive adhesive composition may be curable and may include a polymerization initiator. In formation of the pressure sensitive adhesive sheet, the curable pressure sensitive adhesive composition may be, as necessary.

Pressure sensitive adhesive, curable pressure sensitive adhesive composition, pressure sensitive adhesive sheet and method for manufacturing thereof

There is provided a polyester elastomer foam having a micro and uniform cell structure. The polyester elastomer foam is formed by allowing a polyester elastomer composition containing a polyester elastomer and a surface-treated inorganic substance (except hydroxides) to expand. A residue on a 166 mesh sieve in the surface-treated inorganic substance (except hydroxides) is preferably not more than 0.01%.

Polyester elastomer foam

There is provided a polyester elastomer which is excellent in compression set characteristics and has a micro cell structure. The polyester elastomer foam is formed by allowing a polyester elastomer composition containing a polyester elastomer having a melting point of 180 to 240&#xb0; C. and an epoxy-modified polymer to expand. The epoxy-modified polymer is an epoxy-modified polymer having a weight average molecular weight of 5,000 to 100,000 and an epoxy equivalent of 100 to 3000 g/eq.

Polyester elastomer foam and foam material

There is provided a resin foam excellent in dustproof performance, particularly dustproof performance in a dynamic environment. The resin foam of the present invention has a thickness recovery ratio of 65% or more, wherein the thickness recovery ratio is defined as a ratio of a thickness 1 second after releasing a compressed state to an initial thickness, when the resin foam is compressed for 1 minute in the thickness direction so as to give a thickness equal to 20% of the initial thickness in a 23&#xb0; C. atmosphere; and then the compressed state is released in a 23&#xb0; C. atmosphere.

Resin foam and foam sealing material

The present invention relates to a resin composition for a polyolefin resin foam, including: a polyolefin (A) having a melt flow rate (MFR) at a temperature of 230&#xb0; C. of 0.2 to 0.7 g/10 min and a melt tension at break measured at a temperature of 190&#xb0; C. of 30 cN or more; and a polyolefin (B) having a melt flow rate (MFR) at a temperature of 230&#xb0; C. of 1.5 to 10 g/10 min and a melt tension at break measured at a temperature of 190&#xb0; C. of 10 cN or more, in which the polyolefin (B) is contained in an amount of from 15 to 75 parts by weight based on 100 parts by weight of the polyolefin (A).

Resin composition for polyolefin resin foam, polyolefin resin foam and foamed sealing material

To be provided is a foam waterproofing material superior in waterproofness and flexible enough to be compatible with further minute clearance. The foam waterproofing material according to the present invention is a waterproofing material including a foam having a thickness of 0.1 to 1.0 mm, characterized in that the foam has a micro cell structure with an average cell diameter of 10 to 60 &#x3bc;m and an apparent density of 0.01 to 0.050 g/cm. In the foam waterproofing material, the repulsive load when compressed to 0.1 mm (0.1 mm-compressive repulsion force) of the foam is preferably 0.01 to 0.1 MPa. The foam preferably has a closed-cell structure or a semi-open and semi-closed-cell structure. In addition, the foam may have a pressure-sensitive adhesive layer on one or both faces thereof. The pressure-sensitive adhesive layer is preferably formed on the foam via a film layer.

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Ibaraki, Japan

Itsuhiro Hatanaka