Formable anti-glare polymer films

Patent metadata

Field	Value
Publication number	US-2021115288-A1
Application number	US-201616463682-A
Country	US
Kind code	A1
Filing date	Nov 23, 2016
Priority date	Nov 23, 2016
Publication date	Apr 22, 2021
Grant date	—

Abstract

The present invention relates to a formable anti-glare polymer film wherein a thermoplastic polymeric film having at least one textured surface and a coating on the textured surface said coating being obtainable by coating with a coating composition comprising
(a) a binder, comprising at least one difunctional (meth)acrylic monomer and/or difunctional (meth)acrylate oligomer, and

(b) a crosslinking agent, comprising at least one multifunctional (meth)acrylic monomer,

wherein said coating composition has a theoretical crosslinking density in the range of from <2.0·10 −3 , preferably of from ≤1.99·10 −3 to ≥0.1·10 −3 , more preferably of from ≤1.85·10 −3 to ≥0.2·10 −3 ,

and a process for producing such film. Furthermore the invention relates to molded articles, particularly molded articles obtainable by in-mold decoration (IMD) processes, and the use of the formable anti-glare films for the manufacture of molded articles.

First claim

1 . A formable anti-glare polymer film having at least one textured surface and a coating on the textured surface, said coating being a reaction product of a coating composition comprising:
(a) a binder, comprising at least one of a difunctional (meth)acrylic monomer or a difunctional (meth)acrylate oligomer; and (b) a crosslinking agent, comprising at least one multifunctional (meth)acrylic monomer, wherein said coating composition has a theoretical crosslinking density in the range of from <2.0·10 −3 , preferably of from ≤1.99·10 −3 to ≥0.1·10 −3 , more preferably of from ≤1.85·10 −3 to ≥0.2·10 −3 .

2 . The formable anti-glare polymer film of claim 1 , wherein the elongation at break determined according to DIN ISO 573-2 of the coated film is ≥3.0%.

3 . The formable anti-glare polymer film of claim 1 , wherein the thermoplastic film comprises a thermoplastic selected from the group consisting of polycarbonate, polyacrylate, poly(meth)acrylate, polysulphones, polyesters, thermoplastic polyurethane, polystyrene, and the copolymers and mixtures (blends) thereof.

4 . The formable anti-glare polymer film of claim 3 , wherein the thermoplastic film comprises a polycarbonate.

5 . The formable anti-glare polymer film of claim 1 , wherein the uncoated thermoplastic film has a roughness R3z according to DIN ISO 4593 in the range of 500 nm to 4000 nm.

6 . The formable anti-glare polymer film of claim 1 , wherein component (a) is selected from the group consisting of (i) 2 propanediol diacrylate, 1,3 butanediol dimethacrylate, 1,3 glyceryl dimethacrylate, 1, 6 hexanediol dimethacrylate, diethyleneglycol dimethacrylate and mixtures thereof, or is selected from the group consisting of (ii) polyester (meth)acrylates oligomers, polyacryl (meth)acrylates oligomers, urethane (meth)acrylates oligomers and mixtures of at least two thereof.

7 . The formable anti-glare polymer film claim 1 , wherein component (a) is selected from the group consisting of polyester (meth)acrylates oligomers, polyacryl (meth)acrylates oligomers, urethane (meth)acrylates oligomers and mixtures of at least two thereof.

8 . The formable anti-glare polymer film of claim 1 , wherein component (b) is selected from the group consisting of di-, tri-, tetra-, penta- and hexa(meth)acrylates and mixtures of at least two thereof.

9 . The formable anti-glare polymer film of claim 1 , wherein component (b) is selected from the group consisting of alkoxylated di-, tri-, tetra-, penta- and hexa(meth)acrylates and mixtures of at least two thereof.

10 . A process for producing a formable anti-glare polymeric film of claim 1 , comprising the steps of:
(i) providing a thermoplastic polymeric film having at least one textured surface; (ii) coating the film on the side of the textured surface with a coating composition comprising:
(a) a binder, comprising at least one difunctional (meth)acrylic monomer and/or difunctional (meth)acrylic oligomer; and
(b) a crosslinking agent, comprising at least one multifunctional (meth)acrylic monomer,
wherein said coating composition has a theoretical crosslinking density in the range of from <2.0·10 −3 , preferably of from ≤1.99·10 −3 to ≥0.1·10 −3 , more preferably of from ≤1.85·10 −3 to ≥0.2·10 −3 , (iii) curing the coated film with actinic radiation, and (iv) optionally thermally or mechanically forming of the cured film.

11 . An article comprising a least one film of claim 1 .

12 . The article of claim 11 , formed by an in-mold decoration process.

13 . The article of claim 11 , wherein the article is a mobile phone, a lens integrated housing, a notebook, a netbook, a computer, a TV, a household device, an interior part of a vehicle, or a body part of a vehicle.

14 - 15 . (canceled)

16 . The formable anti-glare polymer film of claim 1 , wherein the uncoated thermoplastic film has a roughness R3z according to DIN ISO 4593 in the range of 2000 nm to 8000 nm.

17 . The process of claim 10 , wherein the elongation at break determined according to DIN ISO 573-2 of the coated film is ≥3.0%.

18 . The process of claim 10 , wherein the thermoplastic film comprises a thermoplastic selected from the group consisting of polycarbonate, polyacrylate, poly(meth)acrylate, polysulphones, polyesters, thermoplastic polyurethane, polystyrene, and the copolymers and mixtures (blends) thereof.

19 . The process of claim 18 , wherein the thermoplastic film comprises a polycarbonate.

20 . The process of claim 10 , wherein the uncoated thermoplastic film has a roughness R3z according to DIN ISO 4593 in the range of 500 nm to 4000 nm.

21 . The process of claim 10 , wherein the uncoated thermoplastic film has a roughness R3z according to DIN ISO 4593 in the range of 2000 nm to 8000 nm.

22 . The process of claim 10 , wherein component (a) is selected from the group consisting of (i) 2 propanediol diacrylate, 1,3 butanediol dimethacrylate, 1,3 glyceryl dimethacrylate, 1, 6 hexanediol dimethacrylate, diethyleneglycol dimethacrylate and mixtures thereof, or is selected from the group consisting of (ii) polyester (meth)acrylates oligomers, polyacryl (meth)acrylates oligomers, urethane (meth)acrylates oligomers and mixtures of at least two thereof.

23 . The process of claim 10 , wherein component (a) is selected from the group consisting of polyester (meth)acrylates oligomers, polyacryl (meth)acrylates oligomers, urethane (meth)acrylates oligomers and mixtures of at least two thereof.

24 . The process of claim 10 , wherein component (b) is selected from the group consisting of di-, tri-, tetra-, penta- and hexa(meth)acrylates and mixtures of at least two thereof.

25 . The process of claim 10 , wherein component (b) is selected from the group consisting of alkoxylated di-, tri-, tetra-, penta- and hexa(meth)acrylates and mixtures of at least two thereof.

Assignees

• Covestro Deutschland Ag
• Covestro Polymers China Co Ltd

Inventors

• Deivaraj Theivanayagam Chairman
• Kostromine Serguei
• Petzoldt Joachim
• Bayram Nutkiye
• Scheibner Daniel
• Wong Chung Leung
• Feng Meng

Classifications

• G02B5/0268

  characterized by the fabrication or manufacturing method · CPC title

• C09D133/08 Primary

  Homopolymers or copolymers of acrylic acid esters · CPC title

• G02B5/0221

  the surface having an irregular structure (G02B5/0226 takes precedence) · CPC title

• C09D5/006 Primary

  Anti-reflective coatings · CPC title

• C09D7/63

  organic · CPC title