Hardcoat composition and polarizer and display device applying the same

• US 9,874,660 B2
• Filed: 09/10/2015
• Issued: 01/23/2018
• Est. Priority Date: 09/11/2014
• Status: Active Grant

• Current Assignee: Industrial Technology Research Institute
• Original Assignee: Industrial Technology Research Institute
• Inventors: Lin, Hsien-Kuang, Chen, Sue-May
• Primary Examiner(s): Lavarias, Arnel C
• Application Number:
  US14/850,942
• Publication Number:
  US 20160077242A1
• Time in Patent Office: 866 Days
• Field of Search: 35948301, 35948901, 35948907, 359507, 353 20, 362 19, 349 96, 349122, 349162
• CPC Class Codes: C08F 222/10 Esters
• CPC Class Codes: C08L 33/08 Homopolymers or copolymers of acrylic acid esters
• CPC Class Codes: C08L 33/10 Homopolymers or copolymers of methacrylic acid esters
• CPC Class Codes: C09D 4/06 Organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond in combination with a macromolecular compound other than an unsaturated polymer of groups C09D159/00 - C09D187/00
• CPC Class Codes: C09D 5/00 Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced electrically insulating plastics, resins or waxes H01B3/30; Filling pastes
• CPC Class Codes: C09J 133/066 containing -OH groups
• CPC Class Codes: G02B 1/04 made of organic materials, e.g. plastics G02B1/08 takes precedence
• CPC Class Codes: G02B 1/14 Protective coatings, e.g. hard coatings
• CPC Class Codes: G02B 5/305 including organic materials, e.g. polymeric layers

Abstract

A hardcoat composition and a polarizer and a display device applying the same are provided. The hardcoat composition includes an acrylic copolymer, a multi-functional unsaturated photomonomer or oligomer, a photoinitiator, and a thermal curing agent. The acrylic copolymer with hydroxyl group has a weight-average molecular weight equal to or larger than 15,000 and has a glass transition temperature higher than 25° C.

Claims

1. A polarizer, comprising:

an iodine-impregnated polyvinyl alcohol (PVA) film; and

a hardcoat layer which is made from a hardcoat composition, the hardcoat layer formed directly on at least one side of the iodine-impregnated PVA film, wherein the hardcoat composition comprises;

an acrylic copolymer having a hydroxyl group, wherein the acrylic copolymer has a weight-average molecular weight equal to or more than 15,000, and the acrylic copolymer has a glass transition temperature higher than 25°

C.;

a multi-functional unsaturated photomonomer or oligomer;

a photoinitiator; and

a thermal curing agent.

2. The polarizer according to claim 1, wherein the hardcoat composition comprises 30-150 weight parts of the multi-functional unsaturated photomonomer or oligomer with respect to 100 weight parts of the acrylic copolymer.

3. The polarizer according to claim 1, wherein the multi-functional unsaturated photomonomer or oligomer comprises dipentaerythritol hexaacrylate, tripropylene glycol diacrylate, pentaerythritol tetraacrylate, tris(2-hydroxy ethyl)isocyanurate triacrylate, ethoxylated bisphenol A diacrylate, isobornyl acrylate, aliphatic urethane acrylate, epoxy acrylate, or the combinations thereof.

4. The polarizer according to claim 1, wherein the hardcoat composition comprises 0.1-60 weight parts of the thermal curing agent with respect to 100 weight parts of the acrylic copolymer.

5. The polarizer according to claim 1, wherein the hardcoat composition has a gel fraction of 0.5-75% after thermal curing at a temperature of 70-110°

C. and aging at room temperature for 6 days.

6. The polarizer according to claim 1, wherein the hardcoat composition has a gel fraction of 5˜

50% after thermal curing at a temperature of 70˜

110°

C. and aging at room temperature for 6 days.

7. A display device comprising a thin-type polarizer, wherein the thin-type polarizer comprises:

an iodine-impregnated polyvinyl alcohol (PVA) film; and

a hardcoat layer made from a hardcoat composition, the hardcoat layer formed directly on at least one side of the iodine-impregnated PVA film, wherein the hardcoat composition comprises;

an acrylic copolymer with a hydroxyl group;

wherein the acrylic copolymer has a weight-average molecular weight equal to or more than 15,000, and the acrylic copolymer has a glass transition temperature higher than 25°

C.;

a multi-functional unsaturated photomonomer or oligomer;

a photoinitiator; and

a thermal curing agent.