Coated film

• US 10,011,734 B2
• Filed: 01/24/2013
• Issued: 07/03/2018
• Est. Priority Date: 02/25/2012
• Status: Active Grant

• Current Assignee: Mitsubishi Chemical Corporation (Mitsubishi Chemical Group Corp.)
• Original Assignee: Mitsubishi Chemical Corporation (Mitsubishi Chemical Group Corp.)
• Inventors: Sato, Takashi, Kawasaki, Taishi, Fujita, Masato
• Primary Examiner(s): Chen, Vivian
• Application Number:
  US14/378,739
• Publication Number:
  US 20160032135A1
• Time in Patent Office: 1,986 Days
• Field of Search: None
• CPC Class Codes: B32B 2250/03 3 layers
• CPC Class Codes: B32B 2250/244 All polymers belonging to those covered by group B32B27/36
• CPC Class Codes: B32B 2250/40 Symmetrical or sandwich layers, e.g. ABA, ABCBA, ABCCBA
• CPC Class Codes: B32B 2255/10 on synthetic resin layer or on natural or synthetic rubber layer
• CPC Class Codes: B32B 2255/26 Polymeric coating
• CPC Class Codes: B32B 2307/412 Transparent
• CPC Class Codes: B32B 2307/418 Refractive
• CPC Class Codes: B32B 2307/518 bi-axially
• CPC Class Codes: B32B 2333/04 Polymers of esters
• CPC Class Codes: B32B 2367/00 Polyesters, e.g. PET, i.e. polyethylene terephthalate
• CPC Class Codes: B32B 2457/202 LCD, i.e. liquid crystal displays
• CPC Class Codes: B32B 2551/00 Optical elements
• CPC Class Codes: B32B 27/08 of synthetic resin
• CPC Class Codes: B32B 27/26 using curing agents
• CPC Class Codes: B32B 27/30 comprising vinyl (co)polymers; comprising acrylic (co)polymers
• CPC Class Codes: B32B 27/308 comprising acrylic (co)polymers
• CPC Class Codes: B32B 27/36 comprising polyesters
• 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 2433/08 Homopolymers or copolymers of acrylic acid esters
• CPC Class Codes: C08J 2433/10 Homopolymers or copolymers of methacrylic acid esters
• 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 7/046 : Forming abrasion-resistant coatings; Forming surface-hardening coatings
• CPC Class Codes: C08K 3/013 : Fillers, pigments or reinforcing additives
• CPC Class Codes: C08K 5/0025 : Crosslinking or vulcanising agents; including accelerators
• CPC Class Codes: C08K 5/21 : Urea; Derivatives thereof, e.g. biuret
• CPC Class Codes: C08K 5/29 : Compounds containing one or more carbon-to-nitrogen double bonds
• CPC Class Codes: C08K 5/3415 : Five-membered rings
• CPC Class Codes: C08K 5/3492 : Triazines
• CPC Class Codes: C08K 5/34922 : Melamine; Derivatives thereof
• CPC Class Codes: C08K 5/35 : having also oxygen in the ring
• CPC Class Codes: C08K 5/353 : Five-membered rings
• CPC Class Codes: C08K 5/357 : Six-membered rings
• CPC Class Codes: C08L 33/04 : Homopolymers or copolymers of esters C08L43/04 takes precedence
• CPC Class Codes: C08L 33/06 : of esters containing only carbon, hydrogen and oxygen, which oxygen atoms are present only as part of the carboxyl radical
• 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: C08L 33/14 : of esters containing halogen, nitrogen, sulfur, or oxygen atoms in addition to the carboxy oxygen
• CPC Class Codes: C08L 61/28 : with melamine
• CPC Class Codes: C08L 63/06 : Triglycidylisocyanurates
• CPC Class Codes: C09D 133/04 : Homopolymers or copolymers of esters C09D143/04 takes precedence
• CPC Class Codes: C09D 133/06 : of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
• CPC Class Codes: C09D 133/08 : Homopolymers or copolymers of acrylic acid esters
• CPC Class Codes: C09D 133/10 : Homopolymers or copolymers of methacrylic acid esters
• CPC Class Codes: C09D 133/14 : of esters containing halogen, nitrogen, sulfur or oxygen atoms in addition to the carboxy oxygen
• CPC Class Codes: C09D 161/28 : with melamine
• CPC Class Codes: C09D 163/06 : Triglycidylisocyanurates
• CPC Class Codes: Y10T 428/263 : Coating layer not in excess of 5 mils thick or equivalent
• CPC Class Codes: Y10T 428/31786 : Of polyester [e.g., alkyd, etc.]

Abstract

According to the present invention, there is provide a coated film capable of exhibiting an excellent adhesion property to a prism resin used in optical applications such as a backlight unit for liquid crystal displays, etc., in particular, a prism resin adaptable for high-brightness prisms, i.e., a high-refractive index prism resin. The coating film of the present invention comprises a polyester film and a coating layer formed on at least one surface of the polyester film which is prepared from a coating solution comprising a (meth)acrylate (A) and at least one crosslinking agent (B) selected from the group consisting of an oxazoline compound, an isocyanate-based compound and a melamine compound.

Claims

1. A coated film comprising:

a polyester film;

a coating layer having a thickness of 0.002 to 0.2 μ

m and formed on at least one surface of the polyester film which is prepared from a coating solution comprising a (meth)acrylate (A) and at least one crosslinking agent (B) selected from the group consisting of an oxazoline compound, an isocyanate-based compound and a melamine compound; and

a surface functional layer which is formed from a solvent-free active energy ray-curable resin on a surface of the coating layer and has a refractive index of 1.56 to 1.65.

2. The coated film according to claim 1, wherein a content of a carbon-carbon double bond in the (meth)acrylate (A) is not less than 3% by weight.

3. The coated film according to claim 1, wherein the (meth)acrylate (A) is a polyfunctional (meth)acrylate.

4. The coated film according to claim 1, wherein a content of the (meth)acrylate (A) in the coating solution is 5 to 95% by weight, and a content of the crosslinking agent (B) in the coating solution is 5 to 95% by weight, both based on a total amount of whole non-volatile components in the coating solution.

5. The coated film according to claim 1, wherein the coating solution further comprises particles having an average particle diameter of not more than 1.0 μ

m, and a content of the particles in the coating solution is not more than 25% by weight based on a total amount of whole non-volatile components in the coating solution.

6. The coated film according to claim 1, wherein the isocyanate-based compound is selected from the group consisting only of tolylene diisocyanate, xylylene diisocyanate, methylene diphenyl diisocyanate, phenylene diisocyanate, naphthalene diisocyanate, α

,α

,α

′

,α

′

-tetramethyl xylylene diisocyanate, methylene diisocyanate, propylene diisocyanate, lysine diisocyanate, trimethyl hexamethylene diisocyanate, hexamethylene diisocyanate, cyclohexane diisocyanate, methyl cyclohexane diisocyanate, isophorone diisocyanate, methylene-bis(4-cyclohexyl isocyanate), isopropylidene dicyclohexyl diisocyanate, biuret compounds, isocyanurate compounds, uretdione compounds, carbodiimide-modified compounds of isocyanates, blocked isocyanates, and combinations thereof.

7. The coated film according to claim 6, wherein blocking agents used in the production of the blocked isocyanates are selected from the group consisting only of bisulfites;

phenol, cresol, ethyl phenol, propylene glycol monomethyl ether, ethylene glycol, benzyl alcohol, methanol, ethanol, dimethyl malonate, diethyl malonate, methyl acetoacetate, ethyl acetoacetate, acetyl acetone, butyl mercaptan, dodecyl mercaptan, ε

-caprolactam and δ

-valerolactam, diphenyl aniline, aniline and ethylene imine, acetanilide, acetic acid amide, formaldehyde, acetaldoxime, acetone oxime, methyl ethyl ketone oxime, cyclohexanone oxime, and combinations thereof.

8. A coated film comprising:

a polyester film, and

a coating layer having a thickness of 0.002 to 0.2 μ

m and formed on at least one surface of the polyester film which is prepared from a coating solution comprising a (meth)acrylate (A) and at least one crosslinking agent (B) selected from the group consisting of an oxazoline compound, an isocyanate-based compound and a melamine compound,

wherein non-volatile components in the coating solution consist only of a (meth)acrylate (A) and at least one crosslinking agent (B) selected from the group consisting of an oxazoline compound, an isocyanate-based compound and a melamine compound.