Binder Composition Applied for Polyester Type Films and Optical Film Using the Same

• US 20090068484A1
• Filed: 03/06/2007
• Published: 03/12/2009
• Est. Priority Date: 03/17/2006
• Status: Active Grant

• Current Assignee: Kimoto Company Limited
• Original Assignee: Kimoto Company Limited
• Inventors: Toshima, Yasumaro
• Granted Patent: US 7,771,828 B2
• Time in Patent Office: Days
• US Class Current: 428/480
• CPC Class Codes: C08G 18/62 Polymers of compounds having carbon-to-carbon double bonds
• CPC Class Codes: C08J 2367/00 Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain of polyester-amides C08J2377/12; of polyester-imides C08J2379/08; Derivatives of such polymers
• CPC Class Codes: C08J 2475/00 Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
• CPC Class Codes: C08J 7/0427 with only one layer of a composition containing a polymer binder with more layers C08J7/042
• CPC Class Codes: C08J 7/043 Improving the adhesiveness of the coatings per se, e.g. forming primers adhesives in the form of films or foils characterised by the primer layers between the polymer carriers and the adhesives C09J7/50
• CPC Class Codes: C08J 7/044 Forming conductive coatings; Forming coatings having anti-static properties
• CPC Class Codes: C08J 7/046 Forming abrasion-resistant coatings; Forming surface-hardening coatings
• CPC Class Codes: C08L 2666/02 Organic macromolecular compounds, natural resins, waxes or and bituminous materials
• CPC Class Codes: C08L 2666/18 Polyesters or polycarbonates according to C08L67/00 - C08L69/00; Derivatives thereof
• CPC Class Codes: C08L 67/00 Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain of polyester-amides C08L77/12; of polyester-imides C08L79/08; Compositions of derivatives of such polymers
• CPC Class Codes: C08L 75/04 Polyurethanes
• CPC Class Codes: C09D 175/04 Polyurethanes
• CPC Class Codes: C09J 133/10 Homopolymers or copolymers of methacrylic acid esters
• CPC Class Codes: G02B 1/105 Protective coatings
• CPC Class Codes: G02B 1/111 using layers comprising organic materials
• CPC Class Codes: G02B 1/14 Protective coatings, e.g. hard coatings
• CPC Class Codes: G02B 1/16 having an anti-static effect, e.g. electrically conducting coatings
• CPC Class Codes: Y10T 428/31551 Of polyamidoester [polyurethane, polyisocyanate, polycarbamate, etc.]
• CPC Class Codes: Y10T 428/31565 Next to polyester [polyethylene terephthalate, etc.]
• CPC Class Codes: Y10T 428/31786 Of polyester [e.g., alkyd, etc.]
• CPC Class Codes: Y10T 428/31797 : Next to addition polymer from unsaturated monomers

Abstract

A binder composition for polyester type films showing superior transparency, film hardness and solvent resistance as well as superior adhesion to polyester type films and an optical film using the composition are provided. The binder composition for polyester type films of the present invention contains a high-molecular weight polymethyl methacrylate (a), an acrylic polyol (b), an isocyanate type curing agent (c), and a polyester resin (d). The optical film of the present invention is an optical film including a polyester type film and a functional layer provided on the polyester type film, the functional layer containing a high-molecular weight polymethyl methacrylate (a), an acrylic polyol (b), an isocyanate type curing agent (c), and a polyester resin (d).

Claims

1. A binder composition for polyester type films, comprising a high-molecular weight polymethyl methacrylate (a), an acrylic polyol (b), an isocyanate curing agent (c), and a polyester resin (d).

2. The binder composition for polyester type films according to claim 1, wherein the high-molecular weight polymethyl methacrylate (a) has a weight average molecular weight of 100,000 to 600,000.

3. The binder composition for polyester type films according to claim 2, wherein contents of the acrylic polyol (b) and the polyester resin (d) in the composition are 20 to 80 parts by weight and 2 to 30 parts by weight, respectively, with respect to 100 parts by weight of the high-molecular weight polymethyl methacrylate (a).

4. An optical film comprising a polyester type film and a functional layer provided on at least one surface of the polyester type film, wherein the functional layer contains the binder composition according to claim 3.

5. The optical film according to claim 4, wherein the functional layer consists of one or more layers selected from a light diffusing layer, a scattering layer, a reflecting layer, an antireflection layer, an anti-Newton-ring layer, an anti-blocking layer, an antistatic layer and a conductive layer.

6. The binder composition for polyester type films according to claim 1, wherein contents of the acrylic polyol (b) and the polyester resin (d) in the composition are 20 to 80 parts by weight and 2 to 30 parts by weight, respectively, with respect to 100 parts by weight of the high-molecular weight polymethyl methacrylate (a).

7. An optical film comprising a polyester type film and a functional layer provided on at least one surface of the polyester type film, wherein the functional layer contains the binder composition according to claim 6.

8. An optical film comprising a polyester type film and a functional layer provided on at least one surface of the polyester type film, wherein the functional layer contains the binder composition according to claim 2.

9. The optical film according to claim 8, wherein the functional layer consists of one or more layers selected from a light diffusing layer, a scattering layer, a reflecting layer, an antireflection layer, an anti-Newton-ring layer, an anti-blocking layer, an antistatic layer and a conductive layer.

10. The optical film according to claim 7, wherein the functional layer consists of one or more layers selected from a light diffusing layer, a scattering layer, a reflecting layer, an antireflection layer, an anti-Newton-ring layer, an anti-blocking layer, an antistatic layer and a conductive layer.