Polymer having polycyclic groups and coating compositions thereof
A polymer and coating composition containing the polymer are provided that are useful in coating applications such as, for example, food or beverage packaging containers. The polymer preferably includes a backbone having one or more polycyclic groups. In one embodiment, the polymer is a polyester and, more preferably, a polyester-urethane polymer. In one embodiment, the one or more polycyclic groups is a tricyclic or higher group.
1. An article, comprising:
a metal substrate of a food or beverage container, or a portion thereof; and
a coating applied on at least a portion of a surface of the metal substrate, the coating prepared from a coating composition including a polyester polymer having a saturated bicyclic group.
2. The article of claim 1 , wherein the polyester polymer is a copolyester polymer and a backbone of the polyester polymer includes urethane linkages.
3. The article of claim 1 , wherein the saturated bicyclic group is present in a backbone of the polyester polymer.
4. The article of claim 1 , wherein the polyester polymer includes at least 10 weight percent of saturated bicyclic groups, based on the weight percent of saturated-bicyclic-group-containing monomer relative to the total weight of the polymer.
5. The article of claim 1 , wherein the polyester polymer has a glass transition temperature of at least 30° C.
6. The article of claim 1 , wherein the polyester polymer has a glass transition temperature of 70° C. or more.
7. The article of claim 1 , wherein the saturated bicyclic group includes one or more heteroatoms in a ring of the saturated bicyclic group.
8. The article of claim 1 , wherein the saturated bicyclic group is derived from a sugar feedstock.
9. The article of claim 1 , wherein the coating composition, based on total weight solids, includes at least 50 weight percent of the polymer.
10. The article of claim 1 , wherein the saturated bicyclic group is derived from isosorbide, isomannide, isoiodide, or a derivative or combination thereof.
11. The article of claim 1 , wherein the saturated bicyclic group is derived from isosorbide.
12. The article of claim 1 , wherein the saturated bicyclic group is derived from a bisanhydrodexitol or isohexide compound.
13. The article of claim 1 , wherein the saturated bicyclic group includes two 5-atom rings.
14. The article of claim 1 , wherein the saturated bicyclic group includes two 6-atom rings.
15. The article of claim 1 , wherein the saturated bicyclic group includes a 5-atom ring and a 6-atom ring.
16. The article of claim 1 , wherein the saturated bicyclic group comprises a norbornane group.
17. The article of claim 1 , wherein the saturated bicyclic group has a structure represented by the below expression:
bicyclo[x.y.z]alkane,
wherein:
x is an integer having a value of 2 or more,
y is an integer having a value of 1 or more,
z is an integer having a value of 0 or more,
and the term alkane refers to the IUPAC nomenclature designation for a given bicyclic molecule.
18. The article of claim 17 , wherein the saturated bicyclic group is bicyclo[4.4.0]decane.
19. An article, comprising:
a metal substrate of a food or beverage container, or a portion thereof; and
a coating applied on at least a portion of an interior surface of the metal substrate, the coating prepared from a coating composition including a liquid carrier and a polyester polymer having a backbone saturated bicyclic group, wherein the polyester polymer has a glass transition temperature of at least 30° C.
20. The article of claim 19 , wherein the polyester polymer has a number average molecular weight of at least 3,000.