Adhesive sheet, and adhesive sheet production method

Patent metadata

Field	Value
Publication number	US-2018282590-A1
Application number	US-201615763357-A
Country	US
Kind code	A1
Filing date	Sep 27, 2016
Priority date	Sep 28, 2015
Publication date	Oct 4, 2018
Grant date	—

Abstract

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 (α) having pressure sensitive adhesiveness, the surface (α) having a concave portion and a flat face existing thereon, a prescribed section (P 1 ) having existing on the side of the surface (α) 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.

First claim

1 . A pressure sensitive adhesive sheet, comprising, on a substrate or a release material, a resin layer comprising a resin part (X) comprising 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, at least a surface (α) of the resin layer opposite to the side having the substrate or the release material provided having pressure sensitive adhesiveness,
wherein:
a concave portion and a flat face exist on the surface (α);
in at least one cross section (P 1 ) of two cross sections of the pressure sensitive adhesive sheet resulting from freely-selecting a region (P) surrounded by a square having an edge length of 5 mm on the surface (α) and cutting the region (P) in the thickness direction with a plane surface going through each of two diagonal lines of the square and being perpendicular to the region (P) on the surface (α),
a concave portion having a maximum height difference of 40% or more of a total thickness of the resin layer, and a flat portion corresponding to a cut portion of the flat face existing in the region (P) and being substantially in parallel to a surface of the substrate or the release material in contact with the resin layer exist on the side of the surface (α) of the cross section (P 1 ); and
an absolute value of a ratio (S EDX /T EDX ) of a value (S EDX ) of an intensity ratio Si/C of a peak intensity (Si) derived from silicon atoms and a peak intensity (C) derived from carbon atoms measured by energy dispersive X-ray analysis for a prescribed region (S) that is positioned under in a thickness direction with respect to one of the concave portion existing on the cross section (P 1 ), and a value (T EDX ) of the intensity ratio Si/C measured by energy dispersive X-ray analysis for a prescribed region (T) that is positioned under in a thickness direction with respect to one of the flat portion existing on the cross section (P 1 ) and has the same length in a horizontal direction as the region (S) is 0.2 or less.

2 . The pressure sensitive adhesive sheet according to claim 1 , wherein the value (S EDX ) of Si/C in the prescribed region (S) is 0.01 or less.

3 . A pressure sensitive adhesive sheet, comprising, on a substrate or a release material, a resin layer comprising a resin part (X) comprising 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, at least a surface (α) of the resin layer opposite to the side having the substrate or the release material provided having pressure sensitive adhesiveness,
wherein:
a concave portion and a flat face exist on the surface (α);
in at least one cross section (P 1 ) of two cross sections of the pressure sensitive adhesive sheet resulting from freely-selecting a region (P) surrounded by a square having an edge length of 5 mm on the surface (α) and cutting the region (P) in the thickness direction with a plane surface going through each of two diagonal lines of the square and being perpendicular to the region (P) on the surface (α),
a concave portion having a maximum height difference of 40% or more of a total thickness of the resin layer, and a flat portion corresponding to a cut portion of the flat face existing in the region (P) and being substantially in parallel to a surface of the substrate or the release material in contact with the resin layer on the side of the surface (α) of the cross section (P 1 ); and
a value (S EDX ) of an intensity ratio Si/C of a peak intensity (Si) derived from silicon atoms and a peak intensity (C) derived from carbon atoms measured by energy dispersive X-ray analysis for a prescribed region (S) that is positioned under in a thickness direction with respect to one of the concave portion existing on the cross section (P 1 ) is 0.01 or less.

4 . The pressure sensitive adhesive sheet according to claim 3 , wherein an absolute value of a ratio (S EDX /T EDX ) of the value (S EDX ) and a value (T EDX ) of the intensity ratio Si/C measured by energy dispersive X-ray analysis for a prescribed region (T) that is positioned under in a thickness direction with respect to one of the flat portion existing on the cross section (P 1 ) and has the same length in a horizontal direction as the region (S) is 0.2 or less.

5 . The pressure sensitive adhesive sheet according to claim 1 , wherein the value (T EDX ) of the intensity ratio Si/C of the prescribed region (T) is more than 0.01.

6 . The pressure sensitive adhesive sheet according to claim 1 , wherein plural concave portions each having a maximum height difference of 40% or more of a total thickness of the resin layer and being different in shape from each other exist on the side of the surface (α) of the cross section (P 1 ).

7 . The pressure sensitive adhesive sheet according to claim 1 , wherein the flat face has an irregular shape on observation from the side of the surface (α).

8 . The pressure sensitive adhesive sheet according to claim 1 , wherein plural flat portions exist on the side of the surface (α) of the cross section (P 1 ).

9 . The pressure sensitive adhesive sheet according to claim 8 , wherein positions of the plural flat portions existing on the side of the surface (α) on the cross section (P 1 ) have no periodicity.

10 . The pressure sensitive adhesive sheet according to claim 8 , wherein distances of each of the plural flat portions existing on the side of the surface (α) on the cross section (P 1 ) to the substrate or the release material are substantially the same as each other.

11 . The pressure sensitive adhesive sheet according to claim 1 , wherein the concave portion has a maximum height difference of 0.5 μm or more.

12 . The pressure sensitive adhesive sheet according to claim 1 , wherein one or more flat faces (f 1 ) having such an area that a region surrounded by a circle having a diameter of at least 100 μm is selectable exist on the surface (α) of the resin layer.

13 . The pressure sensitive adhesive sheet according to claim 1 , wherein one or more flat faces (f 2 ) having an area of 0.2 mm 2 or more exist on the surface (α) of the resin layer.

14 . The pressure sensitive adhesive sheet according to claim 1 , wherein the concave portion is not one formed using a release material having an emboss pattern.

15 . The pressure sensitive adhesive sheet according to claim 13 , wherein a mass retention rate after heating the resin layer to 800° C. for 30 minutes of 3 to 90% by mass.

16 . The pressure sensitive adhesive sheet according to claim 13 , wherein the carbon atom-containing resin contained in the resin part (X) comprises a pressure sensitive adhesive resin.

17 . The pressure sensitive adhesive sheet according to claim 1 , wherein the resin part (X) further comprises at least one selected from a metal chelate crosslinking agent and an epoxy crosslinking agent.

18 . The pressure sensitive adhesive sheet according to claim 1 , wherein the surface (β) of the resin layer on the side on which the substrate or the release material is provided has pressure sensitive adhesiveness.

19 . The pressure sensitive adhesive sheet according to claim 18 , wherein the resin layer is provided on the release material.

20 . The pressure sensitive adhesive sheet according to claim 1 , wherein the resin layer is a multilayer structure comprising at least a layer (Xβ) mainly comprising

Assignees

• Lintec Corp

Inventors

• Amino Yumiko
• Uemura Kazue
• Kato Kiichiro

Classifications

• C09J2203/31

  as a masking tape for painting · CPC title

• C09J9/00 Primary

  Adhesives characterised by their physical nature or the effects produced, e.g. glue sticks (C09J7/00 takes precedence) · CPC title

• C08K3/36

  Silica · CPC title

• C09J11/04

  inorganic · CPC title

• C09J7/401

  characterised by the release coating composition · CPC title