Nitto-denko Corporation

Mami Ikeya

Makoto Kai

Katsuya Kume

Mitsuhiro Kanada

Tomonari Naito

Akiko Takahashi

Tomohide Banba

Natsuki Kobayashi

Junichi Sekiya

Kazuyuki Yagura

Yasushi Buzoujima

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 &#x3bc;m to 70 &#x3bc;m in thickness, 0.3 to 0.6 g/cmin 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.

Double-sided pressure-sensitive adhesive sheet and method for producing the same

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 &#x3bc;m/400 &#x3bc;m or less.

Method for producing double-sided pressure-sensitive adhesive sheet

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&#xd7;10to 100&#xd7;10. 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 %.

Aqueous pressure-sensitive adhesive composition and utilization thereof

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.

Aqueous pressure-sensitive adhesive composition and use thereof

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 R, Rand Rindependently represent H, an alkyl group, an alkylaryl group, NH(ammonium) or &#x2014;(CHCHO)&#x2014;R, wherein n is 1 to 15, and Rrepresents H, an alkyl group, an alkylaryl group or a (meth)acryloyl group.

Inorganic powder-containing resin composition, a film-forming material layer, a transfer sheet, method of producing a substrate having a dielectric layer formed thereon, and a substrate having a dielectric layer formed thereon

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Ibaraki, Japan

Mami Ikeya