Abstract: Provided is a hot-melt PSA composition having a low viscosity when melted with heat and capable of suitably forming a PSA layer. A hot-melt PSA composition comprising a base polymer is provided. The base polymer comprises acrylic polymers A and B. The acrylic polymer A is a polymer of monomers comprising, as the primary component, a (meth)acrylic monomer A having an alkyl group with 4 to 8 carbon atoms. The acrylic polymer B is a polymer of monomers comprising, as a primary component, a (meth)acrylic monomer B having an alkyl group with 9 to 12 carbon atoms. In the base polymer, with the total amount of the acrylic polymers A and B being 100% by weight, the acrylic polymer B content is 10% by weight or more and 90% by weight or less.

Abstract: 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.

Abstract: 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 A represented by the following general formula (1): R—[(CH3)2C6H2—(CH2O)n—CH2]m—OH (1) (in the general formula (1), R is a hydrogen atom or a hydroxyl group, m is 9 to 16, and n is 0 to 3). A content of the tackifier A with respect to 100 parts by weight of the base polymer is 1 part by weight to 10 parts by weight.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: Provided is a resin foam (13) that highly restrains the occurrence of display irregularities in a display unit when the resin foam is used in a touch-screen-equipped device (1), where the display irregularities may occur with user's touch operations. The resin foam (13) according to the present invention is obtained by expansion of a resin composition including a resin. The resin foam has a 25% compression load of 0.1 N/cm2 to 8.0 N/cm2 and is used in the touch-screen-equipped device (1). The resin is preferably at least one resin selected from the group consisting of polyolefin resins, polyester resins, and acrylic resins.

Abstract: 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%.

Abstract: 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° 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.

Abstract: 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° C. atmosphere; and then the compressed state is released in a 23° C. atmosphere.

Abstract: A resin foam having a repulsive stress when compressed by 80% of 1.0 to 9.0 N/cm2, a maximum breaking strength of 1.0 to 10.0 MPa, and a ratio of the maximum breaking strength to a breaking strength in a direction orthogonal to a maximum breaking strength direction (maximum breaking strength/breaking strength in the direction orthogonal to the maximum breaking strength direction) of 1.0 to 5.0. The maximum breaking strength is defined as: a resin foam in a sheet form is measured for a breaking strength in an arbitrary direction in the horizontal direction of the sheet; next, the arbitrary direction is rotated about an axis by 10° intervals to measure a breaking strength in each direction; a direction where the highest breaking strength is measured is defined as the maximum breaking strength direction; and a breaking strength in the maximum breaking strength direction is defined as the maximum breaking strength.

Abstract: A repeelable foam laminate for use of an electronic device has a structure in which a layer containing a polyolefin-based resin is laminated to at least one surface of a foam layer, and surface roughness Sa of the layer containing a polyolefin-based resin is no more than 10 micrometers.

Abstract: The present invention has the object of providing a resin foam and a foam material that exhibits superior dust resistance characteristics in a dynamic environment at the same time as having excellent light shielding characteristics, and is a resin foam having a repulsive force during an 80% compression at 23 degrees C. of 0.1 to 5.0 N/cm2, a surface coverage rate of a foam surface of at least 50%, and a thickness recovery rate as defined below of at least 50%, the thickness recovery rate is defined as the ratio to an initial thickness of the thickness one second after release of a compressed state that is obtained by releasing a compressed state after compressing resin foam for one minute to a thickness of 20% relative to the initial thickness.

Abstract: 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° C. of 0.2 to 0.7 g/10 min and a melt tension at break measured at a temperature of 190° C. of 30 cN or more; and a polyolefin (B) having a melt flow rate (MFR) at a temperature of 230° C. of 1.5 to 10 g/10 min and a melt tension at break measured at a temperature of 190° 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).

Abstract: There is provided a resin foam sheet low in the apparent density and thin and flexible, and excellent in the stability in winding-up (wind-up stability). The resin foam sheet according to the present invention has an apparent density of 0.03 to 0.30 g/cm3, a compression stress at 50%-compression of not more than 5.0 N/cm2, a thickness of not less than 0.05 mm and not more than 0.40 mm, a length of not less than 5 m, and a width of not less than 300 mm. The value determined by the following expression (1) of the resin foam sheet is preferably not more than 25%.

Abstract: 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%.

Abstract: 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 ?m and an apparent density of 0.01 to 0.060 g/cm3. 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.

Abstract: The invention has an object to provide a foam laminate with excellent repeelability for electric or electronic devices. Also, the invention has an object to provide a foam laminate with excellent repeelability and excellent heat resistance for electric or electronic devices. A foam laminate for electric or electronic devices of the invention has, on at least one side of a foam layer, a pressure-sensitive adhesive layer having a crystal melting energy of 50 J/g or less, obtained according to the following: the crystal melting energy is a melting heat (J/g) obtained during a second heating in differential scanning calorimetry conducted under conditions of heating at a heating rate of 10° C./min to melt (a first heating), followed by cooling down to ?50° C. at a cooling rate of 10° C./min (a first cooling), and then heating from ?50° C. at a heating rate of 10° C./min (the second heating) (according to JIS K 7122).