Claims
- 1. A radiation curable coating composition having improved abrasion resistance, comprising:
- (A) 100 parts by weight silica provided as colloidal silica;
- (B) 5 to 500 parts by weight of an acid hydrolysis product of a compound selected from acryloxy-functional silanes having a general formula: ##STR3## wherein R.sup.3 and R.sup.4 are the same or different monovalent hydrocarbon radicals, R.sup.5 is a divalent hydrocarbon radical having from 2 to 8 carbon atoms, R.sup.6 is hydrogen or a monovalent hydrocarbon radical, b is an integer from 1 to 3, c is an integer from 0 to 2, and d is an integer equaling 4-b-c; or glycidoxy-functional silanes having a general formula: ##STR4## wherein R.sup.7 and R.sup.8 are the same or different monovalent hydrocarbon radicals, R.sup.9 is a divalent hydrocarbon radical having from 2 to 8 carbon atoms, e is an integer from 1 to 3, f is an integer from 0 to 2, and g is a integer equaling 4-e-f, and mixtures thereof;
- (C) 10 to 500 parts of a non-silyl acrylate; and
- (D) a catalytic amount of ultraviolet light sensitive photoinitiator.
- 2. A composition as in claim 1 wherein said acryloxy-functional silane is selected from the group consisting of
- 3-methacryloxypropyltrimethoxysilane
- 3-acryloxypropyltrimethoxysilane
- 2-methacryloxyethyltrimethoxysilane
- 2-acryloxyethyltrimethoxysilane
- 3-methacryloxypropyltriethoxysilane
- 3-acryloxypropyltriethoxysilane
- 2-methacryloxyethyltriethoxysilane
- 2-acryloxyethyltriethoxysilane.
- 3. A composition as in claim 1 wherein said glycidoxy-functional silane is selected from the group consisting of
- 3-glycidoxypropyltrimethoxysilane
- 2-glycidoxyethyltrimethoxysilane
- 3-glycidoxypropyltriethoxysilane
- 2-glycidoxyethyltriethoxysilane.
- 4. A composition as in claim 1 wherein said non-silyl acrylate is selected from the group consisting of:
- 2-Hydroxy ethyl acrylate
- 2-Hydroxy ethyl methacrylate
- 3-Hydroxy propyl acrylate
- 3-Hydroxy propyl methacrylate
- 2-Hydroxy-3-methacryloxy propyl acrylate
- 2-Hydroxy-3-acryloxy propyl acrylate
- 2-Hydroxy-3-methacryloxy propyl methacrylate
- Diethylene glycol diacrylate
- Triethylene glycol diacrylate
- Tetraethylene glycol diacrylate
- Trimethylol propane triacrylate
- Tetrahydro furfuryl methacrylate
- 1-6-Hexanediol diacrylate.
- 5. A composition as in claim 1 wherein said photoinitiator is a radiation sensitive aromatic onium salt having a formula:
- (R.sup. --C.sub.6 H.sub.4).sub.n X.sup.+ MQ.sub.h.sup.-
- wherein X is a radical selected from I, P or S; and M is a metal or metalloid and Q is a halogen radical selected from Cl, F, Br, or I; R.sup.10 is hydrogen or a monovalent hydrocarbon radical having 1 to 12 carbon atoms, h is an integer having a value of 4 to 6 inclusive, and n is an integer having a value of 2 or 3.
- 6. A composition as in claim 5 wherein MQ.sub.h.sup.- is selected from SbF.sub.6.sup.-, AsF.sub.6.sup.-, BF.sub.4.sup.-, and PF.sub.6.sup.-.
- 7. A composition as in claim 1 wherein said photoinitiator is present in an amount from approximately 0.05 to 5 parts by weight of the total mixture.
- 8. A composition as in claim 5 wherein said photoinitiator is further combined with 0.5 to 5.0 parts of a radical-type photoinitiator.
- 9. A composition as in claim 8 wherein said radical-type photoinitiator is selected from ethyl benzoin ether, isopropyl benzoin ether, dimethoxyphenylacetophenone or diethoxyacetophenone.
- 10. The cured product of claim 1.
- 11. A solid substrate having at least one surface coated with the coating composition of claim 1.
- 12. An article as defined in claim 11 wherein the solid substrate is comprised of a synthetic organic polymer.
- 13. An article as defined in claim 11 wherein said solid substrate is a metal.
- 14. An article as defined in claim 11 wherein said solid substrate is a synthetic organic polymer having a metallized surface.
- 15. An article as defined in claim 12 wherein said polymer is a transparent polymer.
- 16. An article as defined in claim 15 wherein said polymer is a polycarbonate.
- 17. An article as defined in claim 16 wherein said polycarbonate is transparent.
- 18. An article as defined in claim 16 wherein said polycarbonate is a poly (bisphenol-A carbonate).
- 19. An article as defined in claim 11 wherein the coating composition has been cured on said surface of said solid substrate by an effective amount of ultraviolet radiation.
- 20. An article as defined in claim 11 wherein said surface of said solid substrate has been primed with a primer composition prior to having been coated with the coating composition of claim 1.
- 21. An article as defined in claim 20 wherein said primer composition is comprised of a thermosetting acrylic emulsion.
- 22. An article as defined in claim 12 wherein said polymer is polymethylmethacrylate.
- 23. A process for improving the abrasion resistance of a substrate with a radiation curable coating composition comprising the steps of combining:
- (A) 100 parts by weight silica provided as colloidal silica;
- (B) 5 to 500 parts by weight of an acid hydrolysis product of a compound selected from acryloxy-functional silanes having a general formula: ##STR5## wherein R.sup.3 and R.sup.4 are the same or different monovalent hydrocarbon radicals, R.sup.5 is a divalent hydrocarbon radical having from 2 to 8 carbon atoms, R.sup.6 is hydrogen or a monovalent hydrocarbon radical, b is an integer from 1 to 3, c is an integer from 0 to 2, and d is an integer equaling 4-b-c; or glycydoxy-functional silanes having a general formula: ##STR6## wherein R.sup.7 and R.sup.8 are the same or different monovalent hydrocarbon radicals, R.sup.9 is a divalent hydrocarbon radical having from 2 to 8 carbon atoms, e is an integer from 1 to 3, f is an integer from 0 to 2, and g is an integer equaling 4-e-f, and mixtures thereof;
- (C) 10 to 500 parts of a non-silyl acrylate;
- (D) a catalytic amount of ultraviolet light sensitive photoinitiator;
- coating said radiation curable coating composition upon said substrate; and
- curing said coating composition upon said substrate with an amount of radiation effective for forming an improved abrasion resistant coating upon said substrate.
Parent Case Info
This application is a continuation in part of Ser. No. 129,297, filed Mar. 11, 1980 and which is currently co-pending.
US Referenced Citations (11)
Non-Patent Literature Citations (1)
Entry |
Kirk Othmer, "Encyclopedia of Chemical Technology", IInd Ed., vol. 18, pp. 61-72, Interscience Pub. N.Y. (1969). |
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
129297 |
Mar 1980 |
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