Low-oiling, scratch-resistant, and solvent-resistant polycarbonate film

Patent metadata

Field	Value
Publication number	US-2016115335-A1
Application number	US-201414897694-A
Country	US
Kind code	A1
Filing date	Jun 11, 2014
Priority date	Jun 14, 2013
Publication date	Apr 28, 2016
Grant date	—

Abstract

The present invention relates to a coating composition comprising at least one styrene-acrylonitrile copolymer in a content of at least 30% by weight of the solids content of the coating composition; at least 30% by weight of a UV-curable reactive diluent; 0.1 to 10 parts by weight of at least one photoinitiator; 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. The films coated therewith, especially polycarbonate films, have improved properties in terms of scratch resistance, solvent resistance and a reduced oiling effect, which makes them particularly suitable for use for production of plastics parts in film insert moulding processes.

First claim

1 .- 15 . (canceled)

16 . A coating composition comprising
(a) at least one styrene-acrylonitrile copolymer in a content of at least 30% by weight of the solids content of the coating composition; (b) at least 30% by weight of a UV-curable reactive diluent; (c) 0.1 to 10 parts by weight of at least one photoinitiator; 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 coating composition as claimed in claim 16 , wherein the styrene-acrylonitrile copolymer (a) has an acrylonitrile content in the range of ≧20 and ≦30%.

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

19 . The coating composition as claimed in claim 16 , wherein the at least one UV-curable reactive diluent (b) comprises alkoxylated diacrylates and/or dimethacrylates, alkoxylated triacrylates and/or trimethacrylates, alkoxylated tetraacrylates and/or tetramethacrylates, alkoxylated pentaacrylates and/or pentamethacrylates, alkoxylated hexaacrylates and/or hexamethacrylates, aliphatic urethane acrylates, polyester acrylates, polyacryloylacrylates and mixtures thereof.

20 . The coating composition as claimed in claim 16 , wherein the at least one UV-curable reactive diluent additionally comprises monofunctional monomers in at least 20% by weight of the total proportion of reactive diluent, preferably methyl methacrylate or styrene.

21 . The coating composition as claimed in claim 16 , wherein the solvent is selected from the group consisting of 1-methoxy-2-propanol, diacetone alcohol, 2,2,3,3-tetrafluoropropanol, and mixtures thereof.

22 . The coating composition as claimed in claim 16 , wherein the solvent comprises diacetone alcohol and/or 1-methoxy-2-propanol.

23 . The coating composition as claimed claim 16 , wherein the solvent comprises a mixture of at least 50% by weight of diacetone alcohol and 1-methoxy-2-propanol.

24 . A laminate comprising a substrate and a surface coating, obtained by coating the substrate with a coating composition as claimed in claim 16 .

25 . The laminate as claimed in claim 24 , wherein the substrate is a film.

26 . The laminate as claimed in claim 25 , wherein the film comprises polycarbonate and/or copolycarbonate.

27 . A process for producing a coated film, comprising the steps of:
(i) coating a film with a moulding composition comprising
(a) at least one styrene-acrylonitrile copolymer in a content of at least 30% by weight of the solids content of the coating composition;
(b) at least 30% by weight of a UV-curable reactive diluent;
(c) 0.1 to 10 parts by weight of at least one photoinitiator; 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, delaminating, printing and/or thermally or mechanically forming the film; (iv) irradiating the coating with UV radiation to cure the coating.

28 . The process as claimed in claim 27 , wherein the film comprises polycarbonate and/or copolycarbonate.

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

30 . A plastics parts for the automotive, transport, electrical, electronics and construction industries comprising the coating composition as claimed in claim 16 .

Assignees

• Covestro Deutschland Ag

Inventors

• Kostromine Serguei
• Petzoldt Joachim

Classifications

• C09D4/06 Primary

  {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

• C09D125/12 Primary

  with unsaturated nitriles · CPC title

• C09D133/14

  of esters containing halogen, nitrogen, sulfur or oxygen atoms in addition to the carboxy oxygen · CPC title

• C09D155/00

  Coating compositions based on homopolymers or copolymers, obtained by polymerisation reactions only involving carbon-to-carbon unsaturated bonds, not provided for in groups C09D123/00 - C09D153/00 · CPC title

• C09D125/00

  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 an aromatic carbocyclic ring; Coating compositions based on derivatives of such polymers · CPC title