Lintec Corporation

Nippon Paint Industrial Coatings Co., Ltd.

Nippon Paint Compnay, Ltd.

Nippon Fine Coatings, Inc.

Kiichiro Kato

Kazue Uemura

Yumiko Amino

Shigeru Saito

Kazuhiro Takahashi

Takamasa Kase

Takeshi Kondoh

Kazuhiro Tsuda

Koji Tsuchibuchi

Yasunari Takanashi

Satoshi Kawada

Masaru Matsushima

Masanori Kido

Takeshi Kondo

Takashi Sugino

Yoshitomo Ono

Masato Kishi

Osamu Kanazawa

Haruya Yamada

Yusuke Matsuoka

Shinji Nishioka

Katsuhisa Taguchi

Yumiko Matsubayashi

Tomio Hatanaka

Wataru Miyazaki

Kaisuke Yanagimoto

Kazuya Kato

Takashi Takemoto

Yoshihisa Minerua

Provided a pressure sensitive adhesive sheet including a substrate or a release material having thereon a resin layer that contains a resin part (X) containing a carbon atom-containing resin having a carbon atom in a main chain of a constitutional unit as a main component, and a particle part (Y) consisting of fine particles containing silica particles, a surface (&#x3b1;) having pressure sensitive adhesiveness, the surface (&#x3b1;) having a concave portion and a flat face existing thereon, a prescribed section (P) having existing on the side of the surface (&#x3b1;) a concave portion having a prescribed maximum height difference, and a flat portion corresponding to a cut portion of the flat face existing in a region (P) and being substantially in parallel to a surface of the substrate or the release material in contact with the resin layer, and an absolute value of a ratio of an intensity ratio of a peak intensity derived from silicon atoms and a peak intensity derived from carbon atoms measured by EDX a for a prescribed region (S) that is positioned under one of the concave portion existing on the cross section, and the intensity ratio measured by EDX for a prescribed region (T) that is positioned under one of the flat portion existing on the cross section being 0.2 or less.

Adhesive sheet, and adhesive sheet production method

An electrically peelable pressure sensitive adhesive sheet has a pressure sensitive adhesive layer formed of an electrically peelable pressure sensitive adhesive composition comprising an acrylic copolymer (A) comprising 1 to 99 mass % of a constituent unit (a1) derived from a compound represented by the following general formula (a1), and a surfactant (B). The electrically peelable pressure sensitive adhesive sheet has high adhesion before voltage application, but the adhesion can be effectively decreased by voltage application for a short time. wherein Rrepresents a hydrogen atom or a methyl group, Rrepresents an alkylene group having 1 to 5 carbon atoms that is unsubstituted or has a substituent, and Rrepresents an alkyl group having 1 to 8 carbon atoms that is unsubstituted or has a substituent; and a value of n is an integer of 1 or more.

Electrically peelable adhesive composition and electrically peelable pressure sensitive adhesive sheet, and method for using electrically peelable pressure sensitive adhesive sheet

Provided is a pressure sensitive adhesive sheet including a resin layer that is a multilayer structure containing at least a layer (X&#x3b2;), a layer (Y), and a layer (X&#x3b1;) laminated in this order, a surface (&#x3b1;) of the layer (X&#x3b1;) of the resin layer having pressure sensitive adhesiveness, at least a constitutional component contained in the layer (Y) being different from constitutional components contained in the layer (X&#x3b1;) and the layer (X&#x3b2;), on the prescribed cross section (P) of the pressure sensitive adhesive sheet, in a range of 250 &#x3bc;m in a horizontal direction freely-selected, a difference between a maximum value and a minimum value of the layer (X&#x3b1;) being 3.00 &#x3bc;m or more, and a difference between a maximum value and a minimum value of the layer (Y) being 5.00 &#x3bc;m or more.

Adhesive sheet and method for producing adhesive sheet

Provided are a pressure sensitive adhesive sheet including, on a substrate, a resin layer containing a resin which is a resin layer containing a resin part (X) containing a resin as a main component and a particle part (Y) consisting of fine particles, at least a surface (&#x3b1;) of the resin layer on the side opposite to the side thereof on which the substrate is provided, having pressure sensitive adhesiveness, wherein a bending stress coefficient k in the MD direction of the substrate is 20 N&#xb7;mm or less, a 10% elongation strength in the MD direction thereof is 260 N/15 mm or less, and concave portions satisfying specified requirements are included on the surface (&#x3b1;) of the resin layer; and a method for producing the pressure sensitive adhesive sheet.

Adhesive sheet and production method for adhesive sheet

A pressure sensitive adhesive sheet including, on a substrate or a release material, a resin layer, at least a surface (&#x3b1;) of the resin layer on the opposite to the side on which the substrate or release material is provided having pressure sensitive adhesiveness, wherein a concave portion and a flat face exist on the surface (&#x3b1;) of the resin layer, and a width of the concave portion observed from the side of the surface (&#x3b1;) is non-uniform, and in a region (D) of 8 mm in length&#xd7;10 mm in width as freely-selected on the surface (&#x3b1;), a concave portion having an area of 70 to 99.99% relative to 100% of a total area of the concave portions existing in the region (D) exists.

Provided is a pressure sensitive adhesive sheet including a resin layer on a substrate or a release material, at least a surface (&#x3b1;) of the resin layer on the side opposite to the side thereof on which the substrate or the release material is provided having pressure sensitive adhesiveness, wherein a concave portion and plural flat faces having an irregular shape exist in a region (Dc) surrounded by an arbitrarily predetermined circle on the surface (&#x3b1;) of the resin layer; and with respect to one or more flat faces (S) among the plural flat faces, the one or more flat faces (S) excluding flat faces having a cumulative relative frequency of 30% or less determined by adding the relative frequency from the respective flat faces with a smaller area, an rvalue of the flat faces (S) calculated from specified operations is 0.60 or less.

Adhesive sheet and adhesive sheet production method

A pressure sensitive adhesive sheet, containing a resin layer provided on a substrate or a release material. The resin layer includes a resin part (X) containing as a main component a hydrocarbon resin, and a particle part (Y) consisting of fine particles containing silica particles. At least a surface (&#x3b1;) of the resin layer opposite to the side of the substrate or the release material has pressure sensitive adhesiveness. The resin layer contains a multilayer structure having a layer (X&#x3b1;) and a layer (Y) in this order in the thickness direction from the side of the surface (&#x3b1;). An intensity ratio in the layer (X&#x3b1;) is less than 0.10, and an intensity ratio in the layer (Y) is 0.10 or more. The surface (&#x3b1;) has concave portions of irregular shapes.

Adhesive sheet

An electrically peelable pressure sensitive adhesive composition, which contains an acrylic polymer (A), a (poly)alkylene polyol (B) having a number average molecular weight of no greater than 2000, and an ammonium salt (C), has a high adhesiveness before voltage application, but the adhesiveness can decrease effectively by voltage application for a short time.

Electrically peelable adhesive composition and electrically peelable adhesive sheet, and method for using electrically peelable adhesive sheet

The present invention relates to a pressure sensitive adhesive sheet containing, laminated in this order, a supporting substrate, a pressure sensitive adhesive layer (X), a continuous void-containing layer including a composition containing silica particles, and a pressure sensitive adhesive layer (Y), the continuous void-containing layer having a mass concentration of the silica particles of more than 60% and 100% or less.

The present invention relates to a pressure sensitive adhesive sheet containing, laminated in this order, a supporting substrate, a pressure sensitive adhesive layer (X), a continuous void-containing layer including a composition containing fine particles (excepting silica), and a pressure sensitive adhesive layer (Y), the continuous void-containing layer having a mass concentration of the fine particles of from 45 to 100%.

Provided is a pressure sensitive adhesive sheet having a resin layer on a substrate or a release material, at least a surface (&#x3b1;) of the resin layer being opposite to the side thereof on which the substrate or the release material is provided has pressure sensitive adhesiveness, wherein one or more concave portions exist on the surface (&#x3b1;), and a standard deviation (&#x3c3;) based on a mean brightness value of the surface (&#x3b1;) is 10.0 or more. When attached to an adherend, the pressure sensitive adhesive sheet can readily remove air accumulation to be formed and therefore exhibits excellent air escape property, and has good pressure sensitive adhesion characteristics.

Provided is a pressure sensitive adhesive sheet containing, on a substrate or a release material, a resin layer that includes a resin part (X) containing a resin as a main component, and a particle part (Y) consisting of fine particles, at least a surface (&#x3b1;) of the resin layer being opposite to the side thereof on which the substrate or the release material is provided having pressure sensitive adhesiveness, wherein plural concave portions having a maximum height difference of 0.5 &#x3bc;m or more exist in a predetermined region (P) on the surface (&#x3b1;), and 95% or more of the plural concave portions existing inside the region (P) have shapes differing from each other, and one or more such concave portions exist in a predetermined region (Q) on the surface (&#x3b1;).

A pressure sensitive adhesive sheet containing, on a substrate or a release material, a resin layer, at least a surface (&#x3b1;) of the resin layer being opposite to the side of the substrate or being opposite to the side which the release material is provided, having pressure sensitive adhesiveness, the surface (&#x3b1;) having one or more concave portions, the concave portions having irregular shapes. The pressure sensitive adhesive sheet has an excellent air escape property capable of easily removing air accumulation that may be formed on attaching to an adherend, and is excellent in pressure sensitive adhesion characteristics.

Provided is a pressure sensitive adhesive sheet containing a resin layer on a substrate or a release material, at least a surface (&#x3b1;) of the resin layer being opposite to the side thereof on which the substrate or the release material is provided having pressure sensitive adhesiveness, wherein, when a smooth surface of a light transmissive adherend having a smooth surface is attached to the surface (&#x3b1;), one or more concave portion (G) not kept in contact with the smooth surface exist on the surface (&#x3b1;), and the shapes of the one or more concave portions (G) have irregular shapes. The pressure sensitive adhesive sheet has excellent air escape property capable of readily removing air accumulation that may be formed on attaching to an adherend, and has good pressure sensitive adhesion characteristics.

A pressure sensitive adhesive sheet including, on a substrate or a release material, a resin layer including a resin part (X) containing a resin as a main component, and a particle part (Y) consisting of fine particles and having a surface (&#x3b1;) having pressure sensitive adhesiveness and one or more concave portions. When the surface (&#x3b1;) of the resin layer is adhered to a smooth surface of a light transmissive adherend to give a laminate, the areal ratio (S) of the attached area adhered to the smooth surface to the surface (&#x3b1;) is 10 to 95% at 23&#xb0; C. and 50% RH, and the area increase rate {[(S&#x2212;S)/S]&#xd7;100} is &#x2212;10 to 20% after heating of the smooth surface by statically leaving the laminate at 80&#xb0; C. for 30 minutes.

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Saitama, Japan

Kiichiro Kato