Claims
- 1. A process for preparing a UV-curable coating material comprising the steps of
- effecting a hydrolysis reaction of (a-1) 40 to 90 parts by weight (on a solid basis) of colloidal silica wherein the dispersion medium is a polar solvent, and (a-2) 60 to 10 parts by weight of a hydrolyzate and/or hydrolyzed and partially condensed product of an alkoxy silane compound containing not less than 50% by weight of a compound of the general formula (I) ##STR3## wherein X is CH.sub.2 .dbd.CH--COO--, CH.sub.2 .dbd.C(CH.sub.3)--COO-- or CH.sub.2 .dbd.CH--, R.sup.1 is a direct bond or an alkylene group having 1 to 8 carbon atoms, R.sup.2 and R.sup.3 are alkyl groups having 1 to 8 carbon atoms, a is a whole number of 1 to 3, b is a whole number of 0 to 2, and (a+b) has a value of 1 to 3;
- replacing the dispersion medium of the colloidal silica with a nonpolar solvent when the amount of dehydration is in the range of 30 to 90% of theoretical value; and
- effecting a further condensation reaction while maintaining in the state of 30 to 90% by weight of solid components in the presence of the nonpolar solvent.
- 2. An anti-abrasion coating composition consisting essentially of
- (A) 5 to 70 parts by weight (on a solid basis) of the UV-curable coating material prepared by the process of claim 1,
- (B) 30 to 95 parts by weight of a polyfunctional monomer having two or more (meth)acryloyloxy groups in the molecule,
- (C) 0.01 to 5 parts by weight of a photopolymerization initiator,
- per 100 parts by weight of the combined amount of components (A) and (B).
- 3. An anti-abrasion coating composition of claim 2 which further contains
- (D) 0.1 to 20 parts by weight of an ultraviolet light absorber, and
- (E) 0.1 to 5 parts by weight of a hindered amine type light stabilizer,
- per 100 parts by weight of the combined amount of components (A) and (B).
BACKGROUND OF THE INVENTION
1. Field of the Invention
This application is a Continuation-in-Part of Ser. No. 07/982,726, filed Nov. 27, 1992, now U.S. Pat. No. 5,449,702, incorporated herein in its entirety by reference. This invention relates to coating compositions which, when applied to substrate surfaces and exposed to actinic radiation, can form a crosslinked and cured film having excellent abrasion resistance, surface smoothness, thermal resistance, chemical resistance, durability, weather resistance and adhesion to the substrate.
US Referenced Citations (1)
Number |
Name |
Date |
Kind |
5449702 |
Tayama et al. |
Sep 1995 |
|
Foreign Referenced Citations (1)
Number |
Date |
Country |
07109355 |
Apr 1995 |
JPX |
Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
982726 |
Nov 1992 |
|