Radiation-curable coatings and their use

Details Radiation-curable coatings and their use Radiation-curable coatings and their use

1999-12-17

2001-12-25

Berman, Susan W. (Department: 1711)

Static structures (e.g., buildings)

Inclined top cover

Self-supporting cover

C522S092000, C522S093000, C522S095000, C522S097000, C522S100000, C522S101000, C522S102000, C522S104000, C522S106000, C522S090000, C522S091000, C522S079000, C522S081000, C522S083000, C522S084000, C522S085000, C522S086000

Reexamination Certificate

active

06332291

ABSTRACT:

This invention relates to coating compositions curable by means of high-energy radiation and to the use of the coating compositions for multilayer lacquer coating in the automotive lacquer coating sector, in particular for automotive repair lacquer coating.
It is already known to use coating compositions curable by means of high-energy radiation in automotive lacquer coating. This application also exploits the advantages of radiation-curable coating compositions, such as for example very short curing times, low solvent emissions from the coating composition and the good hardness of the coatings obtained therefrom.
DE-A-196 35 447 accordingly describes a process for the production of a multilayer repair lacquer coating, wherein a coating composition solely containing binders which are free-radically polymerisable by UV radiation is applied as the clear lacquer or pigmented topcoat lacquer.
EP-A-0 000 407 describes radiation-curable coating compositions based on an OH-functional polyester resin esterified with acrylic acid, a vinyl compound, a photoinitiator and a polyisocyanate.
U.S. Pat. No. 4,668,529 furthermore describes a single component surface coating composition for repair lacquer coating which is curable by UV radiation. The UV-curable binder components used are tripropylene glycol diacrylate and trimethylolpropane triacrylate. An epoxy resin based on a bisphenol A diglycidyl ether is additionally present.
The as yet unpublished German patent application P 197 09 560 describes a clear lacquer coating composition for automotive lacquer coating, which contains binders curable by means of high-energy radiation and additionally a binder system curable by addition and/or condensation reactions which contains no free-radically polymerisable double bonds.
WO-A-98/00456 furthermore discloses a binder system which contains OH—, NH
2
—, COOH—, NCO— or epoxy-functional compounds having at least one free-radically polymerisable olefinic double bond, photoinitiators and a binder system based on polyacrylate polyol and/or polyester polyol with melamine resin or with optionally blocked polyisocyanates or based on carboxyl-, anhydride- or amino-functional polyesters and/or polyacrylates with epoxy-functional polyesters and/or polyacrylates.
DE-A-28 09 715 describes binders curable by means of high-energy radiation based on an NCO-functional urethane compound produced from a hydroxyalkyl ester of (meth)acrylic acid and a polyisocyanate, and based on a polyfunctional hydroxyl compound.
The stated prior art coating compositions curable by means of high-energy radiation or the coating compositions formulated therefrom yield coatings which in many respects are still in need of improvement. The coatings exhibit weaknesses with regard to scratch resistance, solvent and chemical resistance and sandability. They do not in every respect fulfil the requirements placed upon a multilayer structure in automotive lacquer coating, in particular in automotive repair lacquer coating. In particular, the curing process in coating compositions curable by high-energy radiation brings about a shrinkage in volume of the applied coating, which results in stresses and cracking in the film. The coating becomes detached from the substrate. While the problem of cracking may indeed be reduced with known coating compositions which, in addition to the radiation curable binders, contain further chemically crosslinking binder components, no satisfactory solution has hitherto been found with regard to cracking and inadequate interlayer adhesion.


REFERENCES:
patent: 4668529 (1987-05-01), Blair
patent: 4820745 (1989-04-01), Muller et al.
patent: 4822829 (1989-04-01), Muller et al.
patent: 4851460 (1989-07-01), Stranghöner et al.
patent: 5932282 (1999-08-01), Diener et al.
patent: 28 09 715 (1978-03-01), None
patent: 36 13 082 (1986-11-01), None
patent: 36 28 124 (1988-03-01), None
patent: 196 35 447 (1996-08-01), None
patent: 197 09 560 (1997-03-01), None
patent: 0 000 407 (1979-01-01), None
patent: 1 575 895 (1980-10-01), None
patent: 96/11217 (1996-04-01), None
patent: 98/00456 (1998-01-01), None

Affiliated with

Also associated with

Rating

Radiation-curable coatings and their use does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Radiation-curable coatings and their use, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Radiation-curable coatings and their use will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2572068