Photocurable coating composition and its use

Patent metadata

Field	Value
Publication number	US-2016145449-A1
Application number	US-201414899619-A
Country	US
Kind code	A1
Filing date	Jun 26, 2014
Priority date	Jun 26, 2013
Publication date	May 26, 2016
Grant date	—

Abstract

The invention relates to a photocurable coating composition, a coating process using said composition, and coated articles comprising the cured composition. The coated articles are weather and scratch resistant.

First claim

1 . A photocurable coating composition comprising
a) at least one photocurable component, b) at least one filler having an average particle size of D 50 <0.5 μm, c) optionally one or more silanes or siloxanes, d) at least one UV stabilizer, e) at least one photoinitiator, f) at least one component selected from the group consisting of particulate non-swellable fillers f1) having an average diameter particle size of D 50 >0.5 μm and swellable or soluble polymers f2), and g) optionally one or more solvents, h) optionally one or more auxiliaries.

2 . The composition according to claim 1 , wherein the photocurable component a) comprises at least one acrylate having one or more functional acrylate groups.

3 . The composition according to claim 1 , wherein the photocurable component a) comprises at least one acrylate having an acrylate functionality of 2 to 4 and at least one acrylate having an acrylate functionality of ≧5.

4 . The composition according to claim 1 , wherein the component f1) is selected from silicas.

5 . The composition according to claim 1 , wherein the component f) is selected from swellable or soluble polymers f2).

6 . The composition according to claim 1 , wherein the component f) is selected from swellable polymers f2) which are selected from the group consisting of polyacrylates and polymethacrylates.

7 . The composition according to claim 1 having a dynamic viscosity of 1-400 mP·s at 25° C. and a shear rate of D=10 s −1 .

8 . A coating process for coating a substrate comprising the step of applying the composition as defined in claim 1 onto the surface of a substrate to be coated.

9 . The coating process for coating a substrate according to claim 8 , comprising the step of applying said composition by a spray-coating process.

10 . The coating process according to claim 8 which comprising the steps of:
i) providing a substrate,
ii) optionally forming a decor, a pattern or an image onto said substrate,
iii) spraying the composition onto the surface of said decor, pattern or image,
iv) optionally drying the coated surface, and
v) irradiating the coated substrate with UV-light.

11 . The coating process according to claim 10 , which comprises the steps of:
v1) irradiating the coated substrate with UV-light of a wave length of less than 200 nm, and subsequently v2) irradiating the coated substrate obtained in step v1) with UV-light of a wave length of 200 to 440 nm.

12 . The coating process according to claim 8 , wherein the formation of the decor, the pattern or the image of step ii) and the spraying of the composition of step (iii) are carried out by an ink-jet printing process.

13 . Coated articles comprising the cured composition obtained by curing the compositions as defined in claim 1 as a transparent topcoat.

14 . Coated articles according to claim 13 , having a multilayer coating comprising:
a) a substrate b) optionally at least one primer layer onto said substrate, c) a coloured or decorative layer, and d) a transparent topcoat layer formed by curing the compositions.

15 . Coated articles according to claim 13 selected from decorative elements, signs, stickers, automotive parts, eyeglasses, eyeglass frames, writing utensils, displays, other optical articles, flexible films and sheets, rigid films and sheets, and keypads.

16 . The composition of claim 5 , wherein the component f) is selected from swellable or soluble polymers f2) having a molecular weight M n of 50,000 to 150,000 g/mol, determined by GPC using polystyrene as a standard.

Assignees

• Momentive Performance Mat Inc

Inventors

• Hilgers Christoph

Classifications

• B05D1/26

  performed by applying the liquid or other fluent material from an outlet device in contact with, or almost in contact with, the surface · CPC title

• B05D5/02

  to obtain a matt or rough surface · CPC title

• C08J3/28

  Treatment by wave energy or particle radiation · CPC title

• B41J2/01

  Ink jet · CPC title

• C09D4/00

  Coating compositions, e.g. paints, varnishes or lacquers, based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond {; Coating compositions, based on monomers of macromolecular compounds of groups C09D183/00 - C09D183/16} · CPC title