Claims
- 1. A method comprising tandem coating a substrate by (i) forming a highly crosslinked thermoset coating from a UV curable composition, and (ii) forming a cured coating from an aqueous composition comprising a polymer comprising, as polymerised units, 0.1 to 100% by weight of the polymer of at least one monomer selected from the group consisting of ethyleneurido-containing monomers, cyanoacetoxy-containing monomers, acetoacetoxy-containing monomers acrolein, methacrolein vinyl (C.sub.1 -C.sub.20 alkyl ketones and keto-containing amides.
- 2. A method as claimed in claim 1, wherein the substrate is coated first with the highly crosslinked coating (i) followed by the cured coating (ii).
- 3. A method as claimed in claim 1, wherein the substrate is coated first with the cured coating (ii) followed by the highly crosslinked coating (i).
- 4. A method as claimed in claim 1, wherein the aqueous composition comprises a polymer comprising from 0.1 to 100%, by weight polymerised units of one or more acetoacetyl functional monomers having the structure: ##STR3## wherein R.sub.1 is either H, alkyl having 1 to 10 carbon atoms or phenyl;
- A is either: ##STR4## wherein R.sub.2 is either H, alkyl having 1 to 10 carbon atoms or phenyl, substituted phenyl, halo, CO.sub.2 CH.sub.3, or CN,
- R.sub.3 is either H, alkyl having 1 to 10 carbon atoms or phenyl, substituted phenyl or halo,
- R.sub.4 is either alkylene or substituted alkylene having 1 to 10 carbon atoms or phenylene, or substituted phenylene,
- R.sub.5 is either alkylene or substituted alkylene having 1 to 10 carbon atoms;
- a, m, n and q are independently either 0 or 1,
- X and Y are independently either --NH-- or --O--;
- B is either A, alkyl having 1 to 10 carbon atoms or phenyl, substituted phenyl, or heterocyclic.
- 5. A method as claimed in claim 4, wherein the monomers are acetoacetoxyethylmethacrylate (AAEM), acetoacetoxyethylacrylate (AAEA), acetoacetoxypropylmathacrylate, allylacetoacetate, acetacetoxybutylmethacrylate, 2,3-di(acetoacetoxy)propyl methacrylate, vinyl acetoacetate, or combinations thereof.
- 6. A method as claimed in claim 1, wherein the polymer used in coating (ii) is a copolymer comprising carbony functionality wherein the copolymer comprises, as polymerised units, from 0 to 99.9%, by weight of one or more copolymerisable monomers; preferably, the copolymerisable monomers are selected from the group consisting of substituted and unsubstituted, saturated and monoethylenically unsaturated carboxylic acid ester monomers, such as methyl(meth)acrylate, ethyl(meth)acrylate, butyl(meth)acrylate, 2-ethylhexyl(meth)acrylate, decyl(meth)acrylate, lauryl(meth)acrylate, isodecyl(meth)acrylate, oleyl(meth)acrylate, palmityl(meth)acrylate, steryl(meth)acrylate, methyl itaconate, methylfumarate, butyl fumarate, glycidyl methacrylate, dicyclopentadienyl(meth)acrylate, isocyanoatoethylmethacrylate hydroxyethyl(meth)acrylate, hydroxypropyl(meth)acrylate, N,N'-dimethylamino(meth)acrylate and vinyl acetate; subsituted and unsubstituted carboxylic acid monomers and anhydrides thereof, such as (meth)acrylic acid, crotonic acid, itaconic acid, fumaric acid, maleic acid and maleic anhydide; substituted and unsubstituted (meth)acrylamide monomers; styrene and substituted styrene monomers; other substituted or unsubstituted vinyl monomers such as vinyl chloride, vinylidene chloride and N-vinylpyrrolidone; other substituted and unsubstituted alkylene monomers such as ethylene, propylene, butylene, and isopropylene; and acrylonitrile and methacrylonitrile.
- 7. A method as claimed in claim 1, wherein the polymer used in coating (ii) comprises, as polymerised units, 0.1 to 25% by weight substituted and unsubstituted polyfunctional ethylenically unsaturated monomers such as allylmethacrylate, diallylphthalate, 1,4-butyleneglycol di(meth)acrylate, 1,6-hexanediol diacrylate and divinylbenzene.
- 8. A method as claimed in claim 1, wherein the polymer used in coating (ii) comprises acid functional pendant moiety sufficient to provide the polymer with an acid number of from 1 to 325.
- 9. A method as claimed in claim 1, wherein the polymer used in coating (ii) has a glass transition temperature of from -40.degree. C. to 120.degree. C.
- 10. A method as claimed in claim 1, wherein the polymer used in coating (ii) has a GPC weight average molecular weight of 500 to 5,000,000.
- 11. A method as claimed in claim 1, wherein the polymer used in coating (ii) has an average particle size from 20 to 1000 mm.
Parent Case Info
This application claims the benefit of U.S. Provisional Application Ser. No. 60/033,481, filed Dec. 19, 1996.
US Referenced Citations (10)
Foreign Referenced Citations (3)
Number |
Date |
Country |
0697417 |
Feb 1996 |
EPX |
4344391 |
Jun 1995 |
DEX |
7-102218 |
Apr 1995 |
JPX |
Non-Patent Literature Citations (1)
Entry |
Radiation Curing in Polymer Science and Technology, vol. 1 Fundamentals and Methods, edited by J.P. Fouassier and J.F. Rabek (1993) pp. 1-47. |