Sheet for forming hard coating

Patent metadata

Field	Value
Publication number	US-9233495-B2
Application number	US-201113496074-A
Country	US
Kind code	B2
Filing date	Feb 9, 2011
Priority date	Feb 10, 2010
Publication date	Jan 12, 2016
Grant date	Jan 12, 2016

Abstract

The present invention relates to a sheet for forming a hard coating and a method of formation. The present invention can provide a transfer material or a surface protection sheet having a high index of refraction and superior physical properties, such as hardness, friction resistance, abrasion resistance, chemical resistance, transparency, luster, and the like, for forming a hard coating on the surface of various molded products, including resin molded products or wood products, and a method for forming a hard coating from such transfer material or surface protection sheets.

First claim

The invention claimed is:

1. A sheet for forming a hard coating, comprising:
a base;
a release layer formed on one side of the base;
a coating layer formed on the release layer and containing a heat-cured product of a resin composition comprising a resin and a thiol curing agent, the resin having an epoxy group and a (meth)acryloyl group;
a patterned layer, formed using a binder of a polyvinyl resin, a polyamide resin, a polyester resin, a polyacrylic resin, a polyurethane resin, a polyvinyl acetal resin, a polyester urethane resin, a cellulose ester resin, or an alkyd resin and coloring ink including pigments or dyes having a suitable color, on the coating layer or on the other side of the base; and
an adhesive layer formed on the patterned layer;
wherein the resin composition further comprises a multifunctional acrylate present in an amount of 30 parts by weight or less based on 100 parts by weight of the resin,
wherein the resin has an epoxy equivalent weight of 4,000 g/eq to 6,600 g/eq and a (meth)acryloyl equivalent weight of 349 g/eq to 500 g/eq;
wherein the thiol curing agent has at least two thiol groups and is present in an amount of 0.5 to 5 parts by weight based on 100 parts by weight of the resin; and
wherein the sheet has a pencil hardness of 5H or more.

2. The sheet of claim 1 , wherein the resin has a weight average molecular weight of about 5,000 to 100,000.

3. The sheet of claim 1 , wherein the thiol curing agent is represented by Formula 1:

where R 1 to R 4 each independently represent hydrogen, alkyl, alkoxy, alkenyl, alkynyl, or a thiol containing group.

4. The sheet of claim 3 , wherein the thiol containing group is represented by Formula 2:
-A-B—C-D-SH

where A represents a single bond or alkylene, B represents —NH(C═O)—, —OC(═O), —O—E—OC(═O)—, —SC(═O)—, or —OCH 2 —, C represents a single bond or alkylene, and D represents a single bond or a bivalent moiety represented by Formula 3, wherein E represents alkylene:
—O P n ,  [formula 3]

where P represents bivalent aryl, and n represents an integer from 0 to 10.

5. The sheet of claim 3 , wherein R 1 to R 4 each independently represent hydrogen, C1 to C4 alkyl or -A-B—C-D-SH, and at least two of R 1 to R 4 comprise -A-B—C-D-SH, where A represents a single bond or C1 to C4 alkylene, B is —OC(═O) or —O-E-OC(═O)—, C represents a single bond or C1 to C4 alkylene, and D represents a single bond or a bivalent moiety represented by Formula 4, wherein E represents C1 to C4 alkylene:

where n represents an integer from 0 to 10.

6. The sheet of claim 1 , wherein the resin composition further comprises a photoinitiator.

7. The sheet of claim 6 , wherein the photoinitiator is present in an amount of 1 to 15 parts by weight based on 100 parts by weight of the resin.

8. The sheet of claim 1 , wherein the resin composition further comprises an antioxidant.

9. The sheet of claim 8 , wherein the antioxidant is present in an amount of 0.1 to 2 parts by weight based on 100 parts by weight of the resin.

10. The sheet of claim 1 , wherein the resin composition further comprises lubricants, UV absorbers, thermosetting catalysts, fillers, or isocyanate compounds.

11. The sheet of claim 1 , further comprising: a deposition layer on the coating layer or on the other side of the base.

12. The sheet of claim 1 , wherein the thiol curing agent includes at least one polythiol selected from the group consisting of: ethoxylated trimethylolpropane tris(3-mercaptopropionate), ethylene glycol bis(3-mercaptopropionate), trimethylolpropane tris(3-mercaptopropionate), pentaerythritol tetrakis (3 -mercaptopropionate), and pentaerythritol tetrakis(3 -mercapto acetate).

13. A sheet for forming a hard coating, comprising:
a base;
a release layer formed on one side of the base
a coating layer formed on the release layer and containing a heat-cured product of a resin composition comprising a resin and a thiol curing agent, the resin having an epoxy group, a (meth)acryloyl group, an epoxy equivalent weight of 4,000 g/eq to 6,600 g/eq, and a (meth)acryloyl equivalent weight of 349 g/eq to 500 g/eq;
a patterned layer, formed using a binder of a polyvinyl resin, a polyamide resin, a polyester resin, a polyacrylic resin, a polyurethane resin, a polyvinyl acetal resin, a polyester urethane resin, a cellulose ester resin, or an alkyd resin and coloring ink including pigments or dyes having a suitable color, on the coating layer or on the other side of the base; and
an adhesive layer formed on the patterned layer;
wherein the resin composition has a weight average molecular weight of 20,000 to 70,000 and further comprises a multifunctional acrylate present in an amount of 30 parts by weight or less based on 100 parts by weight of the resin,
wherein the thiol curing agent has at least two thiol groups and is present in an amount of 0.5 to 5 parts by weight based on 100 parts by weight of the resin; and
wherein the sheet has a pencil hardness of 5H or more.

Assignees

• Kim Yun-Bong
• Kim Won-Kook
• Gwon Dong-Joo
• Kang Yang-Gu
• Kim Jin-Woo
• Ryu Mu-Seon
• Lg Hausys Ltd

Inventors

• Kim Yun-Bong
• Kim Won-Kook
• Gwon Dong-Joo
• Kang Yang-Gu
• Kim Jin-Woo
• Ryu Mu-Seon

Classifications

• C08J7/0427

  with only one layer of a composition containing a polymer binder (with more layers C08J7/042) · CPC title

• C09J2463/006

  in the substrate · CPC title

• C08G59/66

  Mercaptans · CPC title

• C09D133/06

  of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical · CPC title

• B29C45/14811 Primary

  Multilayered articles (B29C45/14827 takes precedence) · CPC title