Hard coating composition and composition for forming a high refractive index antiblocking layer

Patent metadata

Field	Value
Publication number	US-9938426-B2
Application number	US-201314388927-A
Country	US
Kind code	B2
Filing date	Mar 19, 2013
Priority date	Mar 30, 2012
Publication date	Apr 10, 2018
Grant date	Apr 10, 2018

Abstract

To provide a hard coating composition which forms a hard coat layer that has high visibility and good hardness, while having stretchability. To provide a technique which is capable of effectively preventing blocking phenomenon in a layered product such as a resin film without adversely affecting the visibility. The present invention provides a hard coating composition which contains (A) a phenolic novolac acrylate that has two or more acrylate groups and (B) an aromatic group-containing mono or poly(meth)acrylate compound that contains 1-2 mol of an alkylene oxide structure having two or three carbon atoms in each molecule. This hard coating composition contains 60-85 parts by mass of the phenolic novolac acrylate (A) and 15-30 parts by mass of the (meth)acrylate (B) per 100 parts by mass of the resin component contained in the hard coating composition.

First claim

What is claimed is:

1. A hard coating composition comprising:
(A) a phenolic novolac acrylate having two or more acrylate groups, and
(B) an aromatic group-containing mono or poly (meth)acrylate having 1 or 2 mols of an alkylene oxide structure with two or three carbon atoms in each molecule,
wherein the hard coating composition comprises 60 to 85 parts by mass of the phenolic novolac acrylate (A) and 15 to 30 parts by mass of the (meth)acrylate (B), to provide 100 parts by mass of a resin content in the hard coating composition.

2. The hard coating composition according to claim 1 , wherein the phenolic novolac acrylate (A) is represented by the following formula (I):

wherein R 1 represents H or CH 2 OH, R 2 represents H or OH, n represents a number of 2 to 5 and m represents a number of 0 to 5.

3. The hard coating composition according to claim 1 , wherein the (meth)acrylate (B) is an aromatic group-containing (meth)acrylate having a refractive index within a range of 1.56 to 1.64.

4. The hard coating composition according to claim 1 , further comprising (C) a fluorene unit-containing (meth)acrylate having two or more (meth)acrylate groups, wherein the hard coating composition comprises 60 to 70 parts by mass of the phenolic novolac acrylate (A), 15 to 30 parts by mass of the (meth)acrylate (B) and 15 to 25 parts by mass of the fluorene unit-containing (meth)acrylate (C) to provide 100 parts by mass of the resin content in the hard coating composition.

5. The hard coating composition according to claim 4 , wherein the fluorene unit-containing (meth)acrylate (C) is represented by the following formula (II):

wherein each of R 3 independently represents H or CH 3 , R 4 represents -A-OC(O)CR═CH 2 , wherein A each represents —OCH 2 CH 2 —, —OCH 2 CH 2 CH 2 —, —OCH(CH 3 )CH 2 — or —OCH 2 CH(CH 3 )— and R each represents H or CH 3 .

6. The hard coating composition according to claim 1 , wherein a total content of ZnO, TiO 2 , CeO 2 , SnO 2 , ZrO 2 and indium tin oxide in the hard coating composition is less than or equal to 0.0001% by mass.

7. A hard coat film comprising a transparent polymer substrate and a hard coat layer which is obtainable by applying the hard coating composition according to claim 1 on the substrate, wherein the hard coat layer has a refractive index within a range of 1.565 to 1.620.

8. The hard coat film according to claim 7 , wherein the hard coat layer has a thickness within a range of 0.05 to 10 μm.

9. The hard coat film according to claim 7 , wherein
the substrate is a PET film having a thickness within a range of 20 to 300 μm, and
the hard coat film has a characteristic that the hard coat layer has no crack in case that the hard coat film is elongated by 15% in a machine direction at a tension rate of 5 mm/second at 20° C.

10. The hard coat film according to claim 7 , wherein
the substrate is a polycarbonate film having a thickness within a range of 30 to 200 μm, and
the hard coat film has a characteristic that both of the hard coat layer and the substrate have no crack in case that the hard coat film is bent at a 180 degree-angle under a condition of 25° C. and 60 degree/second.

11. A transparent electroconductive laminate comprising the hard coat film according to claim 7 and a transparent electrically conducting layer formed on at least one surface of the hard coat film.

12. The transparent electroconductive laminate according to claim 11 , wherein
the transparent electrically conducting layer is a crystalline layer comprising indium oxide, and
the transparent electrically conducting layer has a thickness within a range of 5 to 50 nm.

13. The transparent electroconductive laminate according to claim 11 , wherein the transparent electroconductive laminate has a metal oxide layer between the hard coat layer and the transparent electrically conducting layer, and the metal oxide layer has a thickness within a range of 0.5 to 5.0 nm.

14. A touch panel comprising the transparent electroconductive laminate according to claim 11 .

15. A composition for forming a high refractive index antiblocking layer comprising a first component and a second component, wherein
the high refractive index is within a range of 1.565 to 1.620,
the first component is an unsaturated double bond containing acrylic copolymer, and
the second component comprises:
(A) a phenolic novolac acrylate having two or more acrylate groups, and
(B) an aromatic group-containing mono or poly (meth)acrylate having 1 or 2 mols of an alkylene oxide structure with two or three carbon atoms in each molecule, wherein
the second component comprises 60 to 85 parts by mass of the phenolic novolac acrylate (A) and 15 to 30 parts by mass of the (meth)acrylate (B) to provide 100 parts by mass of the second component,
a difference of solubility parameter values (ΔSP) of the first component (SP1) and the second component (SP2) is within a range of 1 to 4,
a mass ratio of the first component to the second component in the composition is from 0.5:99.5 to 20:80, and
phase separation occurs between the first component and the second component after the composition for forming the high refractive index antiblocking layer is applied, to form an antiblocking layer having a microscopic convexoconcave on its surface.

16. The composition for forming a high refractive index antiblocking layer according to claim 15 , wherein the phenolic novolac acrylate (A) is represented by the following formula (I):

wherein R 1 represents H or CH 2 OH, R 2 represents H or OH, n represents a number of 2 to 5 and m represents a number of 0 to 5.

17. The composition for forming a high refractive index antiblocking layer according to claim 15 , wherein the (meth)acrylate (B) is an aromatic group-containing (meth)acrylate having a refractive index within a range of 1.56 to 1.64.

18. The composition for forming a high refractive index antiblocking layer according to claim 15 , wherein a total content of ZnO, TiO 2 , CeO 2 , SnO 2 , ZrO 2 and indium tin oxide in the composition is less than or equal to 0.0001% by mass.

19. An antiblocking film comprising a transparent polymer substrate and an antiblocking layer which is obtainable by applying the composition according to claim 15 on the substrate, wherein
the antiblocking layer has a refractive index within a range of 1.565 to 1.620, and
the antiblocking layer has an arithmetic average roughness (Ra) of 0.001 to 0.09 μm and a ten-point average roughness (Rz) of 0.01 to 0.5 μm.

20. The antiblocking film according to claim 19 , wherein the antiblocking layer has a thickness within a range of 0.05 to 10 μm.

21. The antiblocking film according to claim 19 , wherein
the substrate is a PET film having a thickness within a range of 20 to 300 μm, and
the antiblocking film has a characteristic that the antiblocking layer has no crack in case that the antiblocking film is elongated by 15% in a machine direction at a tension rate of 5 m/minute at 20° C.

22. The antiblocking film according to claim 19 , wherein
the substrate is a polycarbonate film having a thickness within a range of 30 to 200 μm, and
the antiblocking film has a characte

Assignees

• Nippon Bee Chemical Co Ltd
• Teijin Ltd
• Nippon Paint Automotive Coatings Co Ltd

Inventors

• Kobayashi Kazuhito
• Nakata Yusuke
• Imamura Koichi
• Kanzaki Ryuhei
• Okada Yohei

Classifications

• C08G8/36

  by etherifying · CPC title

• Y10T428/31935

  Ester, halide or nitrile of addition polymer · CPC title

• Y10T428/265

  1 mil or less · CPC title

• Y10T428/266

  of base or substrate · CPC title

• C09D4/00 Primary

  Coating compositions, e.g. paints, varnishes or lacquers, based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond {; Coating compositions, based on monomers of macromolecular compounds of groups C09D183/00 - C09D183/16} · CPC title