Compositions for containers and other articles and methods of using same
This invention provides a polymer, which is preferably a polyether polymer. The polymer may be used in coating compositions. Containers and other articles comprising the polymer and methods of making such containers and other articles are also provided. The invention further provides compositions including the polymer (e.g., powder coatings), which have utility in a variety of coating end uses, including, for example, valve and pipe coatings.
1. A powder coating composition comprising at least 50 wt-%, based on total resin solids, of a polyether polymer that does not contain structural units derived from bisphenol A, bisphenol F, bisphenol S, or polyhydric phenols having estrogenic activity greater than or equal to that of bisphenol S when tested using the MCF-7 assay, wherein the polyether polymer has a glass transition temperature of at least 40° C. and is formed by reacting ingredients including:
(i) an extender and
(ii) a diepoxide compound,
wherein the extender or diepoxide compound, or both, includes one or more segments of the below Formula (I):
wherein:
each of the oxygen atoms depicted in Formula (I) is present in an ether linkage;
v is independently 0 to 4 when t is 0 and v is independently 0 to 3 when t is 1;
w is 4;
when t is 1 each of the phenylene groups depicted in Formula (I) includes at least one Hydrogen atom attached to the ring at an ortho position relative to the depicted oxygen atoms;
each R 1 , if present, is independently an atom or group having an atomic weight of at least 15 Daltons that is substantially nonreactive with an epoxy group;
R 2 , if present, is a divalent group;
n is 0 or 1; with the proviso that if n is 0, the phenylene groups depicted in Formula (I) can optionally join to form a fused ring system in which case w is 3 and v is 0 to 2;
t is 0 or 1; and
two or more R 1 and/or R 2 groups can join to form one or more cyclic groups.
2. The powder coating composition of claim 1 , wherein the polyether polymer includes at least 25% by weight of phenylene groups, t is 1 and each of the phenylene groups depicted in Formula (I) includes two Hydrogen atoms attached to the ring at an ortho position relative to the depicted oxygen atom.
3. The powder coating composition of claim 1 , wherein the polyether polymer includes at least 45% by weight of phenylene groups.
4. The powder coating composition of claim 1 , wherein t is 1 and n is 1.
5. The powder coating composition of claim 4 , wherein R 2 is an organic group having 8 or more carbon atoms.
6. The powder coating composition of claim 4 , wherein R 2 is an organic group having 4 to 15 carbon atoms, and wherein R 2 includes one or more cyclic groups.
7. The powder coating composition of claim 6 , wherein the one or more cyclic groups are aromatic or wherein the cyclic groups are alicyclic.
8. The powder coating composition of claim 4 , wherein each v is 0.
9. The powder coating composition of claim 4 , wherein the ether oxygen atom of each phenylene group depicted in Formula (I) is located at a para position relative to R 2 .
10. The powder coating composition of claim 1 , wherein the diepoxide compound includes one or more segments of Formula (I), and wherein the polyether polymer has a number average molecular weight of at least 2,000 to no more than about 11,000.
11. The powder coating composition of claim 10 , wherein the extender comprises hydroquinone, catechol, resorcinol, or a substituted variant thereof.
12. The powder coating composition of claim 10 , wherein the extender comprises a dihydric phenol, and wherein the dihydric phenol is not ortho-substituted.
13. The powder coating composition of claim 10 , wherein the polyether polymer has a glass transition temperature of at least 50° C.
14. The powder coating composition of claim 4 , wherein R 2 includes a polar group, wherein the polar group comprises a group selected from a ketone, a carboxyl, a carbonate, a hydroxyl, a phosphate, a sulfoxide, or a combination thereof.
15. The powder coating composition of claim 4 , wherein the polyether polymer is formed using a polyhydric phenol compound, or a diepoxide formed therefrom, having the formula:
16. The powder coating composition of claim 1 , wherein the polyether polymer does not include any structural units derived from a bisphenol, or an epoxide thereof, that exhibits an estrogenic agonist activity greater than 4,4′-(propane-2,2-diyl)bis(2,6-dibromophenol) in the MCF-7 assay.
17. The powder coating composition of claim 1 , wherein the composition includes one or more curing agents, and wherein the composition is a thermosettable powder composition that forms a thermoset coating when suitably cured.
18. The powder coating composition of claim 17 , where the one or more curing agents comprises a phenolic crosslinker; dicyandiamide, which may be optionally substituted; a carboxyl-functional compound, or a combination thereof.
19. A method comprising:
providing a metal substrate;
applying the powder coating composition of claim 1 on at least a portion of the metal substrate; and
forming a coating from the powder coating composition.
20. The method of claim 19 , wherein the coating is present on an article for conveying or storing potable water or other consumable liquids.
21. An article resulting from the method of claim 20 .
22. The article of claim 21 , wherein the article comprises a valve or fitting for use with potable water, a pipe for conveying liquid, or a liquid storage tank.