Abstract: Provided are a double-sided PSA sheet comprising a PSA layer formed by directly applying an aqueous dispersion-type PSA composition to a non-woven fabric substrate, wherein the layer has a highly smooth surface; and a method for producing the same. In this method, an aqueous dispersion-type PSA composition is applied to at least a first side of the non-woven fabric substrate and the composition is allowed to dry to form a PSA layer. A non-woven fabric of 15 ?m to 70 ?m in thickness, 0.3 to 0.6 g/cm3 in bulk density, and 0.7 sec to 2 sec in air resistance (Gurley) when measured for 8 layers the non-woven fabric substrate is used as the non-woven fabric substrate.

Abstract: A method is provided for producing a double-sided pressure-sensitive adhesive (PSA) sheet of a nonwoven fabric substrate, whereby the inherent performance of the PSA is more fully exploited using an aqueous dispersion-type PSA composition. This method comprises preparing an aqueous dispersion-type PSA composition and a nonwoven fabric substrate serving as a support. The method also comprises forming PSA layers which impregnate the substrate and which are obtained by drying the composition. These PSA layers impregnate the substrate so that the area of gaps observed in a vertical cross-section perpendicular to the machine direction of the substrate is about 500 ?m2/400 ?m or less.

Abstract: Provided are a pressure-sensitive adhesive (PSA) sheet having excellent foam repulsion resistance and an aqueous PSA composition suitable for preparing this sheet. The composition primarily comprises an acrylic polymer obtained by polymerizing a starting monomer material containing an alkyl(meth)acrylate as a main monomer and both acrylic acid and methacrylic acid. The acrylic polymer preferably has a weight average molecular weight of 65×104 to 100×104. The starting monomer material is preferred to further contain a silanol-forming monomer and polymerized without the silanol-forming monomer to produce a polymer having a gel fraction of 7 to 17 mass %. The post-crosslink PSA preferably has a gel fraction of 20 to 55 mass %.

Abstract: The present invention relates to a pressure-sensitive adhesive sheet, which includes: a base material including a foamed substance; and a pressure-sensitive adhesive layer disposed on at least one surface of the base material, in which the pressure-sensitive adhesive layer is formed by a water-dispersible acrylic pressure-sensitive adhesive composition containing a water-dispersible acrylic copolymer (a) having a weight-average molecular weight of from 400,000 to 900,000, said copolymer containing a (meth)acrylic acid alkyl ester having 2 to 14 carbon atoms in the alkyl group thereof as a principal monomer component and a functional group-containing monomer as a monomer component; and a water-dispersible acrylic low-molecular weight component (b) having a weight-average molecular weight of from 5,000 to 250,000.

Abstract: There provided a pressure-sensitive adhesive (PSA) composition constituting a PSA layer, which may exhibit a plurality of properties in a well-balanced manner, and a PSA sheet including the PSA layer. The composition is an aqueous PSA composition in which an acrylic polymer serves as a main component and the acrylic polymer is dispersed in water, and contains: A) acrylic polymer obtained by polymerizing a monomer raw material including alkyl(meth)acrylate as a main monomer, a first functional monomer having a first functional group to react with a hydrazino group, and a second functional monomer having a second functional group to react with a carbodiimide group; B) a hydrazine-based crosslinking agent; and C) a carbodiimide-based crosslinking agent.

Abstract: A method of producing a double-sided pressure-sensitive adhesive (PSA) sheet having PSA layers on both sides of a nonwoven fabric substrate is provided. This method includes the steps of: preparing an emulsion-type PSA composition that satisfies both of the following conditions: a viscosity at 30° C. of 0.1 to 3 Pa·s and a solid content of 50 to 70 mass %. Also included is a step of forming a PSA layer (for example, a second PSA layer) by directly coating at least one side (for example, the second side) of the nonwoven fabric this PSA composition.

Abstract: Provided is a PSA sheet with low toluene and total volatile organic compound (TVOC) emissions as well as low unpleasant odor level felt by users. The PSA sheet comprises a PSA layer formed of a PSA composition comprising an acrylic polymer emulsion and a tackifier resin emulsion; the toluene and TVOC emissions are at most 20 ?g and at most 150 ?g, respectively; in a sensory test, 90% of participants evaluate that the unpleasantness of odors emitted from the PSA sheet is less than that of toluene at a prescribed concentration.

Abstract: The invention provides an inorganic powder-containing resin composition capable of forming a dielectric layer having high light transmittance and excellent in surface smoothness. The invention also provides a film-forming material layer, a transfer sheet and a dielectric layer, which comprise the composition, a method of producing a substrate having a dielectric layer formed thereon, and a substrate having a dielectric layer formed thereon. The inorganic powder-containing resin composition comprises inorganic powder, a binder resin, and a phosphorus compound represented by formula (1): wherein R1, R2 and R3 independently represent H, an alkyl group, an alkylaryl group, NH4+ (ammonium) or —(CH2CH2O)n—R4, wherein n is 1 to 15, and R4 represents H, an alkyl group, an alkylaryl group or a (meth)acryloyl group.

Abstract: Provided are a pressure-sensitive adhesive (PSA) sheet having excellent foam repulsion resistance and an aqueous PSA composition suitable for preparing this sheet. The composition primarily comprises an acrylic polymer obtained by polymerizing a starting monomer material containing an alkyl (meth)acrylate as a main monomer and both acrylic acid and methacrylic acid. The acrylic polymer preferably has a weight average molecular weight of 65×104 to 100×104. The starting monomer material is preferred to further contain a silanol-forming monomer and polymerized without the silanol-forming monomer to produce a polymer having a gel fraction of 7 to 17 mass %. The posterosslink PSA preferably has a gel fraction of 20 to 55 mass %.

Abstract: The present invention provides an aqueous pressure-sensitive adhesive (PSA) composition suitable for a PSA sheet that exhibits high levels of adhesiveness, high-temperature cohesive strength and edge peel resistance in a good balance and for preparation of the same. The composition is composed primarily of an acrylic polymer obtained by polymerizing a starting monomer material containing an alkyl(meth)acrylate as a main monomer and a silanol-forming monomer. The Mw of the polymer is 65×104 to 100×104. The starting monomer material without the silanol-forming monomer are polymerized to produce a polymer having a gel fraction of 7 to 17 mass %. The composition gives a post-crosslink PSA having a gel fraction of 20 to 55 mass %.

Abstract: Provided are a double-sided PSA sheet comprising a PSA layer formed by directly applying an aqueous dispersion-type PSA composition to a non-woven fabric substrate, wherein the layer has a highly smooth surface; and a method for producing the same. In this method, an aqueous dispersion-type PSA composition is applied to at least a first side of the non-woven fabric substrate and the composition is allowed to dry to form a PSA layer. A non-woven fabric of 15 ?m to 70 ?m in thickness, 0.3 to 0.6 g/cm3 in bulk density, and 0.7 sec to 2 sec in air resistance (Gurley) when measured for 8 layers the non-woven fabric substrate is used as the non-woven fabric substrate.

Abstract: A double-sided PSA sheet 11 comprises PSA layers 2 formed of a water-dispersed PSA composition and a non-woven fabric substrate 1 to support the PSA layers. The substrate 1 contains hemp as a fiber component and is processed with an impregnating agent selected from a group consisting of viscose and starches. The substrate 1 has a grammage of 7 g/m2 to 17 g/m2. The sheet 11 provides excellent adhesive performance and can be removed without substrate failure. Therefore, it is suitable, for example, for fastening recyclable parts.

Abstract: A method is provided for producing a double-sided pressure-sensitive adhesive (PSA) sheet of a nonwoven fabric substrate, whereby the inherent performance of the PSA is more fully exploited using an aqueous dispersion-type PSA composition. This method comprises preparing an aqueous dispersion-type PSA composition and a nonwoven fabric substrate serving as a support. The method also comprises forming PSA layers which impregnate the substrate and which are obtained by drying the composition. These PSA layers impregnate the substrate so that the area of gaps observed in a vertical cross-section perpendicular to the machine direction of the substrate is about 500 ?m2/400 ?m or less.

Abstract: There provided a pressure-sensitive adhesive (PSA) composition constituting a PSA layer, which may exhibit a plurality of properties in a well-balanced manner, and a PSA sheet including the PSA layer. The composition is an aqueous PSA composition in which an acrylic polymer serves as a main component and the acrylic polymer is dispersed in water, and contains: A) acrylic polymer obtained by polymerizing a monomer raw material including alkyl(meth)acrylate as a main monomer, a first functional monomer having a first functional group to react with a hydrazino group, and a second functional monomer having a second functional group to react with a carbodiimide group; B) a hydrazine-based crosslinking agent; and C) a carbodiimide-based crosslinking agent.

Abstract: A method for producing an aqueous pressure-sensitive adhesive (PSA) composition suitable to form a PSA sheet which exhibits high level of adhesive strength, cohesive strength under high temperature conditions and edge peeling resistance in a well-balanced manner is provided. The method comprises subjecting a monomer material to emulsion polymerization to obtain an aqueous emulsion of an acrylic polymer; and adding a crosslinking agent to the emulsion to obtain an aqueous PSA composition. The emulsion polymerization is carried out so as to obtain an acrylic polymer having a mass ratio of the ethyl acetate-insoluble matter of 3% or greater, but 15% or less and a weight average molecular weight of the THF-soluble matter of 70×104 or greater, but 100×104 or less. The crosslinking agent is added such that the mass ratio of the ethyl acetate-insoluble matter with respect to a post-crosslinking PSA 40% or greater, but 70% or less.

Abstract: The present invention relates to a pressure-sensitive adhesive sheet, which includes: a base material including a foamed substance; and a pressure-sensitive adhesive layer disposed on at least one surface of the base material, in which the pressure-sensitive adhesive layer is formed by a water-dispersible acrylic pressure-sensitive adhesive composition containing a water-dispersible acrylic copolymer (a) having a weight-average molecular weight of from 400,000 to 900,000, said copolymer containing a (meth)acrylic acid alkyl ester having 2 to 14 carbon atoms in the alkyl group thereof as a principal monomer component and a functional group-containing monomer as a monomer component; and a water-dispersible acrylic low-molecular weight component (b) having a weight-average molecular weight of from 5,000 to 250,000.

Abstract: The invention provides an inorganic powder-containing resin composition capable of forming a dielectric layer having high light transmittance and excellent in surface smoothness. The invention also provides a film-forming material layer, a transfer sheet and a dielectric layer, which comprise the composition, a method of producing a substrate having a dielectric layer formed thereon, and a substrate having a dielectric layer formed thereon. The inorganic powder-containing resin composition comprises inorganic powder, a binder resin, and a phosphorus compound represented by formula (1): wherein R1, R2 and R3 independently represent H, an alkyl group, an alkylaryl group, NH4+ (ammonium) or —(CH2CH2O)n—R4, wherein n is 1 to 15, and R4 represents H, an alkyl group, an alkylaryl group or a (meth)acryloyl group.