Claims
- 1. A coating composition which crosslinks upon exposure to ultraviolet radiation to produce a transparent coating comprising:
- (A) from 4 to 10 percent by weight of an oxalanilide ultraviolet light stabilizer dissolved in said coating composition, said stabilizer corresponding to the formula ##STR4## in which R is C.sub.6-22 alkyl or C.sub.6-22 alkoxy,
- R.sub.1 and R.sub.2 are independently hydrogen, C.sub.1-8 alkyl,
- C.sub.1-12 alkoxy, C.sub.1-12 alkylthio, phenoxy or phenylthio, provided that R.sub.1 and R.sub.2 may not both be selected from alkylthio, phenoxy and phenylthio, and
- R.sub.3 is hydrogen or C.sub.1-8 alkyl;
- (B) from 20 to 80 percent of a radiation sensitive monomer having at least two addition polymerizable unsaturated bonds;
- (C) from 0.1 to 5.0 percent of a photopolymerization initiator; and
- (D) from 80 to 20 percent of an acrylic addition polymer having at least one amino group and having a number average molecular weight of about 8,000-70,000, said addition polymer being derived from a mixture of copolymerizable ethylenically unsaturated monomers containing a monomeric ethylenically unsaturated amine;
- wherein said percentages of (A), (B), (C) and (D) are by weight based on nonvolatile components of said coating composition.
- 2. The coating composition of claim 1 wherein said radiation sensitive monomer having at least two addition polymerizable unsaturated bonds comprises a (meth)acrylic ester of an organic polyol.
- 3. The coating composition of claim 2 wherein said (meth)acrylic ester comprises pentaerythritol triacrylate and hexanediol diacrylate.
- 4. The coating composition of claim 1 wherein R is isodecyl, R.sub.2 and R.sub.3 are hydrogen, and R.sub.1 is methoxy or ethoxy.
- 5. The coating composition of claim 4 wherein R.sub.1 is ethoxy.
- 6. The coating composition of claim 1 wherein the amount of monomeric ethylenically unsaturated amine in said mixture of copolymerizable ethylenically unsaturated monomers ranges from 1 to 25 percent by weight based on the total weight of monomers employed in the mixture.
- 7. The coating composition of claim 6 wherein said monomeric ethylenically unsaturated amine is selected from the group consisting of an acrylate-functional amine, a methacrylate-functional amine and a mixture thereof.
- 8. A method of coating comprising:
- (I) applying to the metallized surface of a metallized, plastic substrate a film of coating composition which crosslinks upon exposure to ultraviolet radiation to form a transparent coating, said coating composition containing:
- (A) from 4 to 10 percent of an oxalanilide ultraviolet light stabilizer dissolved in said coating composition, said stabilizer corresponding to the formula ##STR5## in which R is C.sub.6-22 alkyl or C.sub.6-22 alkoxy,
- R.sub.1 and R.sub.2 are independently hydrogen, C.sub.1-8 alkyl, C.sub.1-12 alkoxy, C.sub.1-12 alkylthio, phenoxy or phenylthio, provided that R.sub.1 and R.sub.2 may not both be selected from alkylthio, phenoxy and phenylthio, and
- R.sub.3 is hydrogen or C.sub.1-8 alkyl;
- (B) from 20 to 80 percent of a radiation sensitive monomer having at least two addition polymerizable unsaturated bonds;
- (C) from 0.1 to 5.0 percent of a photopolymerization initiator; and
- (D) from 80 to 20 percent of an acrylic addition polymer having at least one amino group and having a number average molecular weight of about 8,000-70,000, said addition polymer being derived from a mixture of copolymerizable ethylenically unsaturated monomers containing a monomeric ethylenically unsaturated amine,
- wherein said percentages of (A), (B), (C) and (D) are by weight based on nonvolatile components of said coating composition; and
- (II) curing said film by exposing the film to ultraviolet radiation.
- 9. The method of claim 8 wherein said radiation sensitive monomer having at least two addition polymerizable unsaturated bonds comprises a (meth)acrylic ester of an organic polyol.
- 10. The method of claim 9 wherein said (meth)acrylic ester comprises pentaerythritol triacrylate and hexanediol diacrylate.
- 11. The method of claim 8 wherein R is isodecyl, R.sub.2 and R.sub.3 are hydrogen, and R.sub.1 is methoxy or ethoxy.
- 12. The method of claim 11 wherein R.sub.1 is ethoxy.
- 13. The method of claim 8 wherein the amount of monomeric ethylenically unsaturated amine in said mixture of copolymerizable ethylenically unsaturated monomers ranges from 1 to 25 percent by weight based on the total weight of monomers employed in the mixture.
- 14. The method of claim 13 wherein said monomeric ethylenically unsaturated amine is selected from the group consisting of an acrylate-functional amine, a methacrylate-functional amine and a mixture thereof.
Parent Case Info
This is a division of application Ser. No. 168,068, filed Mar. 14, 1988; now U.S. Pat. No. 4,833,038, patented May 13, 1989.
US Referenced Citations (6)
Foreign Referenced Citations (2)
Number |
Date |
Country |
2000512A |
Jan 1979 |
GBX |
2137211A |
Oct 1984 |
GBX |
Non-Patent Literature Citations (1)
Entry |
Product Bulletin, 2-435/84, "Sanduvor 3206 Liquid", Sandoz Chemicals Corporation, pp. 1-7. |
Divisions (1)
|
Number |
Date |
Country |
Parent |
168068 |
Mar 1988 |
|