POLYMERS, COATING COMPOSITIONS, COATED ARTICLES, AND METHODS RELATED THERETO
A coated article is disclosed that includes a metal substrate and a coating composition disposed on at least a portion of the metal substrate. The coating can be formed from a composition that includes an acrylic copolymer, which is preferably the reaction product of ethylenically unsaturated monomers and a functional monomer. The functional monomer can be the reaction product of a multifunctional isocyanate and an ethylenically unsaturated nucleophilic monomer. The functional monomer preferably includes a blocked isocyanate group. The articles can be useful for packaging foods and beverages.
1 . An article for packaging comprising:
a metal substrate; and
a coating disposed on at least a portion of the metal substrate, the coating formed from a coating composition that includes an acrylic copolymer having a pendant isocyanate group.
2 . (canceled)
3 . An article for packaging according to claim 1 , wherein the acrylic copolymer comprises the reaction product of:
an ethylenically unsaturated monomer; and
a functional monomer, the functional monomer derived from the reaction product of a multifunctional isocyanate and an ethylenically unsaturated nucleophilic monomer, wherein the functional monomer comprises a blocked isocyanate group.
4 . An article for packaging according to claim 1 , wherein the metal substrate comprises at least a portion of a food or beverage container.
5 . (canceled)
6 . (canceled)
7 . An article for packaging according to claim 3 , wherein the ethylenically unsaturated monomer comprises an alkyl ester of (meth)acrylic acid and a (meth)acrylic acid.
8 . (canceled)
9 . (canceled)
10 . (canceled)
11 . An article for packaging according to claim 3 , wherein the multifunctional isocyanate comprises a diisocyanate.
12 . (canceled)
13 . An article for packaging according to claim 3 , wherein the functional monomer is selected from:
or a combination thereof, wherein m is an integer greater than zero.
14 . An article for packaging according to claim 13 , wherein m is 2 to 18.
15 . An article for packaging according to claim 1 , wherein the coating composition further comprises a crosslinker.
16 . An article for packaging according to claim 15 , wherein the crosslinker comprises a multifunctional amine.
17 . An article for packaging according to claim 1 , wherein the coating composition is a waterborne system.
18 . A method comprising:
providing a coating composition comprising an acrylic copolymer having one or more pendant deblockable blocked isocyanate groups attached to the acrylic copolymer; and
applying the coating composition to at least a portion of a metal substrate.
19 . A method according to claim 18 , wherein the acrylic copolymer comprises the reaction product of:
an ethylenically unsaturated monomer; and
a functional monomer, the functional monomer derived from the reaction product of a multifunctional isocyanate and an ethylenically unsaturated nucleophilic monomer, wherein the functional monomer comprises a blocked isocyanate group.
20 . A method according to claim 18 , wherein the acrylic copolymer is water-dispersible.
21 . A method according to claim 18 , further comprising curing the coating composition to form an adherent hardened coating.
22 . A method according to claim 21 , wherein curing the coating composition comprises heating the coating composition to a temperature of from about 150° C. to about 260° C. for from about 20 minutes to about 5 seconds.
23 . (canceled)
24 . (canceled)
25 . (canceled)
26 . (canceled)
27 . A coating composition comprising:
at least 20 weight percent, based upon total nonvolatile weight, of an acrylic copolymer having a blocked isocyanate group; and
a liquid carrier,
wherein the coating composition is substantially free of bisphenol A, bisphenol F, and bisphenol S and is suitable for use in forming a food-contact coating on a food or beverage container.
28 . A coating composition according to claim 27 , wherein the acrylic copolymer comprises the reaction product of:
an ethylenically unsaturated monomer; and
a functional monomer, the functional monomer derived from the reaction product of a multifunctional isocyanate and an ethylenically unsaturated nucleophilic monomer, wherein the functional monomer comprises a blocked isocyanate group.
29 . A coating composition of claim 27 , wherein the coating composition comprises an aqueous dispersion of the acrylic copolymer.
30 . A coating composition of claim 27 , wherein the blocked isocyanate group comprises a reaction product of one or more deblockable blocking agents selected from ε-caprolactam, diisopropylamine, or methyl ethyl ketoxime.
31 . (canceled)
32 . (canceled)
33 . (canceled)