Polyethers containing non-bisphenolic cyclic groups
Metal food or beverage containers are coated with a polyether polymer containing at least two ether linkages in the polymer backbone. The polymer is substantially free of segments derived from bisphenol A and epoxides thereof, and is a reaction product of, or can be derived from, (i) an aryl- or heteroaryl-group-containing diepoxide that is not derived from a polyhydric phenol or a glycidyl ester and (ii) a polymer backbone extender that has two functional groups reactive with an epoxy group and which following reaction with the diepoxide provides at least one pendant aryl or heteroaryl group on the polymer backbone, or provides at least one divalent aryl or heteroaryl group in the polymer backbone and linked to the backbone via ether linkages.
1. An article comprising a food or beverage container, or a portion thereof, having a metal substrate and a food-contact coating applied on at least a portion of the metal substrate, wherein the coating is formed from a coating composition that includes a polyether polymer having a polymer backbone, wherein the polymer contains at least two ether linkages in the polymer backbone; is substantially free of segments derived from bisphenol A and epoxides thereof; and is a reaction product of, or can be derived from, reactants including:
(i) an aryl- or heteroaryl-group-containing diepoxide that is not derived from a polyhydric phenol or a glycidyl ester; and
(ii) a polymer backbone extender, wherein the extender:
(a) has two functional groups reactive with an epoxy group; and
(b) provides, following reaction with the diepoxide:
(i) at least one pendant aryl or heteroaryl group on the polymer backbone, or
(ii) at least one divalent aryl or heteroaryl group in the polymer backbone and linked to the backbone via ether linkages,
wherein the diepoxide is one or more of the diglycidyl ether of 1,2-benzenedimethanol, the diglycidyl ether of 1,3-benzenedimethanol, the diglycidyl ether of 1,4-benzenedimethanol, the diglycidyl ether of 1,4-benzenediethanol, the diglycidyl ether of 1,3-benzenedipropanol, the diglycidyl ether of 1,4-benzenedipropanol, the diglycidyl ether of 2-(4-hydroxyphenyl)ethanol, the diglycidyl ether of 4,4′-(1,4-phenylene)bis(4-methyl-2-pentanol), the diglycidyl ether of 2-(3-hydroxyphenyl)ethanol, the diglycidyl ether of 2-hydroxyphenethyl alcohol, the diglycidyl ether of 1-phenyl-1,2-propanediol, the diglycidyl ether of 2-phenyl-1,2-propanediol, the diglycidyl ether of 1-phenyl-1,3-propanediol, the diglycidyl ether of 2-phenyl-1,3-propanediol, the diglycidyl ether of 1-phenyl-1,2-ethanediol, or the diglycidyl ether of vanillyl alcohol, the diglycidyl ether of 2,5-furandimethanol.
2. The article of claim 1 , wherein the diepoxide provides a pendant aryl or heteroaryl group on the polymer backbone.
3. The article of claim 1 , wherein the diepoxide provides an aryl or heteroaryl group in the polymer backbone and linked to it via ether linkages.
4. The article of claim 1 , wherein the aryl or heteroaryl groups of the diepoxide and the extender are nonphenolic.
5. The article of claim 1 , wherein the diepoxide is derived from a compound having:
a single phenyl hydroxyl group; and
an alcohol or acid functional group that is not a phenyl hydroxyl group and is capable of reacting with epichlorohydrin to provide an epoxide group.
6. The article of claim 1 , wherein the polymer has a number average molecular weight of at least 2,000.
7. The article of claim 1 , wherein the polymer has a Tg of at least 30° C.
8. The article of claim 1 , wherein the diepoxide compound does not include ester linkages.
9. The article of claim 1 , wherein the extender includes a segment of Formula I or Formula IV shown below:
wherein:
each depicted oxygen atom in Formula I is present in an ether linkage;
R 1 is a trivalent organic group having from 1 to 10 carbon atoms;
X is a divalent organic group having from 1 to 10 carbon atoms, an oxygen atom, a sulfur atom, or a nitrogen-containing group;
n is 0 or 1;
Ar 1 is an aryl or heteroaryl group which does not contain a bisphenol monomer segment;
the terminal oxygen atoms attached to R 3 and R 4 in Formula IV are present in ether linkages;
R 3 and R 4 independently are each divalent organic groups having from 1 to 10 carbon atoms; and
Ar 2 is a divalent nonphenolic aryl or heteroaryl group which does not contain a bisphenol monomer segment.
10. The article of claim 1 , wherein the polyether polymer is substantially free of segments derived from bisphenol monomers or epoxides of bisphenol monomers.
11. The article of claim 1 , wherein the polyether polymer is free of halogen atoms.
12. The article of claim 1 , wherein the backbone of the polyether polymer is free of ester linkages.
13. The article of claim 1 , wherein the coating composition is solvent-based and contains at least 20 wt. % non-volatile components, based on total resin solids.
14. The article of claim 1 , wherein the coating composition is water-based and contains at least 50 wt. % water.
15. The article of claim 1 , wherein the coating composition includes a crosslinker.
16. The article of claim 1 , wherein the polyether polymer contains furanylene heteroaryl groups.
17. An article comprising a food or beverage container, or a portion thereof, having a metal substrate and a food-contact coating applied on at least a portion of the metal substrate, wherein the coating is formed from a coating composition that includes a polyether polymer having a polymer backbone, wherein the polymer contains at least two ether linkages in the polymer backbone; is substantially free of segments derived from bisphenol A and epoxides thereof; and is a reaction product of, or can be derived from, reactants including:
(i) an aryl- or heteroaryl-group-containing diepoxide that is not derived from a polyhydric phenol or a glycidyl ester; and
(ii) a polymer backbone extender, wherein the extender:
(a) has two functional groups reactive with an epoxy group; and
(b) provides, following reaction with the diepoxide:
(i) at least one pendant aryl or heteroaryl group on the polymer backbone, or
(ii) at least one divalent aryl or heteroaryl group in the polymer backbone and linked to the backbone via ether linkages,
wherein the diepoxide includes a segment of Formula I shown below:
wherein:
each depicted oxygen atom in Formula I is present in an ether linkage;
R 1 is a trivalent organic group having from 1 to 10 carbon atoms;
X is a divalent organic group having from 1 to 10 carbon atoms, an oxygen atom, a sulfur atom, or a nitrogen-containing group;
n is 0 or 1; and
Ar 1 is an aryl or heteroaryl group which does not contain a bisphenol monomer segment and forms a pendant group in the polymer backbone.
18. The article of claim 17 , wherein the segment of Formula I has an atomic weight less than 500 Daltons.
19. The article of claim 17 , wherein the polymer is derived from a diepoxide of Formula II shown below:
wherein:
R 1 , X, Ar 1 , and the subscript n are the same as in Formula I;
Y, if present, is a divalent organic group including at least one carbon atom;
each t is independently 0 or 1; and
each R 2 is a hydrogen atom.
20. An article comprising a food or beverage container, or a portion thereof, having a metal substrate and a food-contact coating applied on at least a portion of the metal substrate, wherein the coating is formed from a coating composition that includes a polyether polymer having a polymer backbone, wherein the polymer contains at least two ether linkages in the polymer backbone; is substantially free of segments derived from bisphenol A and epoxides thereof; and is a reaction product of, or can be derived from, reactants including:
(i) an aryl- or heteroaryl-group-containing diepoxide that is not derived from a polyhydric phenol or a glycidyl ester; and
(ii) a polymer backbone extender, wherein the extender:
(a) has two functional groups reactive with an epoxy group; and
(b) provides, following reaction with the diepoxide:
(i) at least one pendant aryl or heteroaryl group on the polymer backbone, or
(ii) at least one divalent aryl or heteroaryl group in the polymer backbone and linked to the backbone via ether linkages,
wherein the diepoxide is derived from a compound having:
a single phenyl hydroxyl group; and
an alcohol that is not a phenyl hydroxyl group and is capable of reacting with epichlorohydrin to provide an epoxide group.