Low-oiling coated polycarbonate films

Patent metadata

Field	Value
Publication number	US-2016311991-A1
Application number	US-201414897707-A
Country	US
Kind code	A1
Filing date	Jun 11, 2014
Priority date	Jun 14, 2013
Publication date	Oct 27, 2016
Grant date	—

Abstract

The present invention relates to a coated polycarbonate film coated with at least one polymethylmethacrylate-containing layer, comprising a polycarbonate film beneath at least one polymethylmethacrylate-containing layer having a polymethylmethacrylate content of at least 40% by weight, characterized in that the total layer thickness of the at least one polymethylmethacrylate-containing layer is at least 10 μm, the uppermost layer of the at least one polymethylmethacrylate-containing layer is obtainable by coating with a coating composition comprising at least one polymethylmethacrylate polymer or polymethylmethacrylate copolymer having a mean molar mass Mw of at least 100 000 g/mol in a content of at least 40% by weight of the solids content of the coating composition; at least one UV-curable reactive diluent in a content of at least 30% by weight of the solids content of the coating composition; at least one photoinitiator in a content of 0.1 to 10 parts by weight of the solids content of the coating composition; and at least one organic solvent, where the proportion of ethylenically unsaturated groups is at least 3 mol per kg of the solids content of the coating composition.

First claim

1 - 15 . (canceled)

16 . A coated polycarbonate film comprising a polycarbonate film beneath at least one polymethylmethacrylate-containing layer having a polymethylmethacrylate content of at least 40% by weight, wherein
the total layer thickness of the at least one polymethylmethacrylate-containing layer is at least 10 μm, the uppermost layer of the at least one polymethylmethacrylate-containing layer is obtained by coating with a coating composition comprising
(a) at least one polymethylmethacrylate polymer or polymethylmethacrylate copolymer having a mean molar mass Mw of at least 100 000 g/mol in a content of at least 40% by weight of the solids content of the coating composition;
(b) at least one UV-curable reactive diluent in a content of at least 30% by weight of the solids content of the coating composition;
(c) at least one photoinitiator in a content of 0.1 to 10 parts by weight of the solids content of the coating composition; and
(d) at least one organic solvent,
where the proportion of ethylenically unsaturated groups is at least 3 mol per kg of the solids content of the coating composition.

17 . The coated polycarbonate film as claimed in claim 16 , comprising one polymethylmethacrylate-containing layer.

18 . The coated polycarbonate film as claimed in claim 16 , comprising two polymethylmethacrylate-containing layers.

19 . The coated polycarbonate film as claimed in claim 18 , comprising a polycarbonate/polymethylmethacrylate film having a coating obtained by coating with a coating composition atop the polymethylmethacrylate layer of the film.

20 . The coated polycarbonate film as claimed in claim 19 , wherein the co-extruded polymethylmethacrylate layer has a thickness of at least 15 μm.

21 . The coated polycarbonate film as claimed in claim 16 , wherein the polymethylmethacrylate polymer or polymethylmethacrylate copolymer (a) has a Vicat softening temperature VET to ISO 306 of at least 95° C.

22 . The coated polycarbonate film as claimed in claim 16 , wherein the polymethylmethacrylate copolymer (a) consists of 70% by weight to 99.5% by weight of methyl methacrylate and 0.5% by weight to 30% by weight of methyl acrylate

23 . The coated polycarbonate film as claimed in claim 16 , wherein the at least one UV-curable reactive diluent (b) comprises bifunctional, trifunctional, tetrafunctional, pentafunctional and/or hexafunctional acrylic and/or methacrylic monomers.

24 . The coated polycarbonate film as claimed in claim 16 , wherein the solvent (d) is selected from the group consisting of 1-methoxy-2-propanol, diacetone alcohol, 2,2,3,3-tetrafluoropropanol, and mixtures thereof.

25 . The coated polycarbonate film as claimed in claim 16 , wherein the solvent (d) comprises 1-methoxy-2-propanol.

26 . A process for producing a coated polycarbonate film comprising the steps of:
(i) coating a polycarbonate film or a co-extruded polycarbonate/polymethylmethacrylate film with a coating composition comprising
(a) at least one polymethylmethacrylate polymer or polymethylmethacrylate copolymer having a mean molar mass Mw of at least 100 000 g/mol in a content of at least 40% by weight of the solids content of the coating composition;
(b) at least one UV-curable reactive diluent in a content of at least 30% by weight of the solids content of the coating composition;
(c) at least one photoinitiator in a content of 0.1 to 10 parts by weight of the solids content of the coating composition; and
(d) at least one organic solvent,
where the proportion of ethylenically unsaturated groups is at least 3 mol per kg of the solids content of the coating composition;
(ii) drying the coating; (iii) optionally cutting the film to size and/or delaminating, printing and/or thermally or mechanically forming the film; (iv) irradiating the coating with UV radiation to cure the coating, where the thickness of the at least one PMMA-containing layer after the drying step is at least 10 μm.

27 . A 3D plastics moulding comprising the coated polycarbonate film as claimed in claim 16 .

28 . The 3D plastics moulding as claimed in claim 27 , obtained by a film insert moulding process.

29 . A method for production of plastics parts in film insert moulding processes comprising utilizing the coated polycarbonate film as claimed in claim 16 .

30 . A plastics part for the automotive, transport, electrical, electronics and construction industries comprising the coated polycarbonate film as claimed in claim 16 .

Assignees

• Covestro Deutschland Ag

Inventors

• Kostromine Serguei
• Petzoldt Joachim

Classifications

• C09D133/12

  Homopolymers or copolymers of methyl methacrylate · CPC title

• C09D133/00

  Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers · CPC title

• C09D4/06

  {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 title

• B05D3/067

  Curing or cross-linking the coating · CPC title

• C08J2369/00

  Characterised by the use of polycarbonates; Derivatives of polycarbonates · CPC title