Surface coating based on crosslinkable fluoropolymers

Patent metadata

Field	Value
Publication number	US-2016017165-A1
Application number	US-201414772019-A
Country	US
Kind code	A1
Filing date	Feb 14, 2014
Priority date	Mar 13, 2013
Publication date	Jan 21, 2016
Grant date	—

Abstract

The present invention relates to a technology for the treatment of materials for exposed outdoor use with a high-grade, abrasion-resistant surface coating based on a formulation comprising crosslinkable fluoropolymers. The invention further relates to particular embodiments for the surface coating.

First claim

1 . A composition comprising:
5 to 70 wt % of a hydroxy-functional fluoropolymer; 5 to 70 wt % of a (meth)acrylate polyol; 5 to 35 wt % of a polyisocyanate; 0.001 to 0.2 wt % of a crosslinking catalyst; 5 to 80 wt % of a solvent; 0.5 to 20 wt % of UV absorber; and 0.5 to 10 wt % of UV stabilizer, the fluoropolymers and the (meth)acrylate polyols accounting in total for 20 to 75 wt % of the composition and together having an OH number of between 50 and 400 mg KOH/g.

2 . The composition according to claim 1 , wherein the OH number of the fluoropolymers and of the (meth)acrylate polyols together is between 90 and 250 mg KOH/g.

3 . The composition according to claim 1 , wherein the hydroxy-functional fluoropolymer is a copolymer of tetrafluoroethylene (TFE) and/or chlorotrifluoroethylene (CTFE), or of vinyl esters, vinyl ethers and/or alpha-olefins, the hydroxy-functional fluoropolymer having been obtained with copolymerization of hydroxy-functional vinyl ethers and/or alpha-olefins.

4 . The composition according to claim 1 , wherein the composition further comprises 5 to 40 wt % of a hydroxy-functional silicone resin, and the silicone resin has an OH number of between 50 and 300 mg KOH/g.

5 . The composition according to claim 1 , wherein the composition comprises as UV absorber 0.5 to 15 wt % of a triazine and as UV stabilizer 0.5 to 7.5 wt % of a HALS compound.

6 . The composition according to claim 1 , wherein the (meth)acrylate polyol has a molecular weight of between 10,000 and 300,000 g/mol and a glass transition temperature of between 10 and 130° C.

7 . The composition according to claim 1 , characterized in that wherein the polyisocyanate is isophorone diisocyanate (IPDI), hexamethylene diisocyanate (HDI), diisocyanatodicyclohexylmethane (H12MDI), 2-methyl-pentane diisocyanate (MPDI), 2,2,4-trimethylhexamethylene diisocyanate/2,4,4-trimethylhexamethylene diisocyanate (TMDI) and/or norbornane diisocyanate (NBDI), and in that the crosslinking catalyst comprises dibutyltin dilaurate, zinc octoate, bismuth neodecanoate and/or tertiary amines, preferably 1,1 diazabicyclo[2.2.2]octane.

8 . The composition according to claim 1 , wherein the composition further comprises up to 20 wt % of a silane-functional alkyl isocyanate or of a glycidyl-functional alkylsilane.

9 . The composition according to claim 1 , wherein the solvent is water.

10 . A substrate wherein the substrate is coated with a composition according to claim 1 and the coating after drying and crosslinking has a thickness of between 0.5 and 200 μm.

11 . A method for coating a substrate, comprising:
coating the substrate with a composition according to claim 1 ; and then subsequently drying and crosslinking the coating.

12 . The method according to claim 11 , wherein the substrate is a surface coating sheet coated on one side with the composition and coated on the other side with a layer having adhesive properties, and wherein the surface coating sheet is optionally adhesively bonded to a second substrate.

13 . The method according to claim 11 , wherein the substrate is coated by thermal transfer technology with the composition, and the composition is first applied to a film or paper carrier material furnished with a release layer.

14 . The method according to claim 11 , wherein the coating obtained is coated additionally with a further scratch-resistant coating, conductive layer, anti-soiling coating and/or reflection-enhancing layers or other layers with optical functions.

15 . A process comprising employing the composition according to claim 1 for the surface enhancement of decorative laminates, OLEDs, thermosets, rollable displays or exterior window films or as anti-corrosion coatings.

16 . A process comprising employing the composition according to claim 1 for the surface enhancement of thin-film solar cells, mirrors for concentrating solar radiation, or photovoltaic backsheets.

Assignees

• Numrich Uwe
• Hennig André
• Hallack Markus
• Jelittte Rüdiger
• Evonik Roehm Gmbh
• Evonik Roehm Gmbh

Inventors

• Numrich Uwe
• Hennig Andre
• Bernhardt Stefan
• Hallack Markus
• Jelitte Ruediger

Classifications

• F24S23/82

  characterised by the material or the construction of the reflector · CPC title

• C09D133/12

  Homopolymers or copolymers of methyl methacrylate · CPC title

• C09D5/00

  Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced {(electrically insulating plastics, resins or waxes H01B3/30)}; Filling pastes · CPC title

• C09D127/18

  Homopolymers or copolymers of tetrafluoroethene · CPC title

• C09D175/04

  Polyurethanes · CPC title