Polymer compositions for forming an enamel coating on a wire
The present disclosure provides for a coating composition for forming a coating on a wire. The coating composition includes a polyamide-imide resin, a polyimide resin, a polyesterimide resin, or any two or more of these resins and one or more caprolactam-derived solvents. The present disclosure also provides for a method of producing a coating composition for forming a coating on a wire. The method includes providing a polyamide-imide resin, a polyimide resin, a polyesterimide resin, or any two or more of these resins and one or more caprolactam-derived solvents, and mixing the polyamide-imide resin, the polyimide resin, the polyesterimide resin, or the two or more of these resins and the one or more caprolactam-derived solvents until the polyamide-imide resin, the polyimide resin, the polyesterimide resin, or the two or more of these resins is in solution with the one or more caprolactam-derived solvents to produce the coating composition.
1 . A coated wire, comprising:
a wire; and
coating composition disposed on a surface of the wire, comprising:
a polyamide-imide resin, a polyimide resin, a polyesterimide resin, or any two or more of these resins; and
one or more caprolactam-derived solvents, wherein the one or more caprolactam-derived solvents comprise N-ethyl caprolactam in an amount of at least 50 wt. %, based on a total weight of solvents in the coating composition.
2 . The coated wire of claim 1 , wherein the one or more caprolactam-derived solvents is 10 wt. % to 90 wt. % of the total weight of the coating composition.
3 . The coated wire of claim 1 , wherein the one or more caprolactam-derived solvents includes two caprolactam-derived solvents.
4 . The coated wire of claim 3 , wherein each of the two caprolactam-derived solvents is from 5 wt. % to 95 wt. % of the one or more caprolactam-derived solvents.
5 . The coated wire of claim 3 , wherein the two caprolactam-derived solvents are N-ethylcaprolactam and N-butylcaprolactam.
6 . The coated wire of claim 3 , wherein the two caprolactam-derived solvents are N-ethylcaprolactam and N-(methoxymethyl) caprolactam.
7 . The coated wire of claim 3 , wherein the two caprolactam-derived solvents are N-ethylcaprolactam and N-(ethoxymethyl) caprolactam.
8 . The coated wire of claim 3 , further including a third caprolactam-derived solvent.
9 . The coated wire of claim 8 , wherein each of the three caprolactam-derived solvents is from 5 wt. % to 90 wt. % of the three caprolactam-derived solvents.
10 . The coated wire of claim 1 , wherein the one or more caprolactam-derived solvents include N-ethylcaprolactam, N-butylcaprolactam, N-(methoxymethyl) caprolactam, and N-(ethoxymethyl) caprolactam.
11 . The coated wire of claim 1 , wherein the polyamide-imide resin, the polyimide resin, the polyesterimide resin, or the two or more of these resins is less than 80% imidized.
12 . The coated wire of claim 1 , wherein polyamide-imide resin, the polyimide resin, the polyesterimide resin, or the two or more of these resins is 5 wt. % to 50 wt. % of the coating composition.
13 . The coated wire of claim 1 , further including a co-solvent, wherein the co-solvent is an organic solvent having a vapor pressure greater than any of the one or more caprolactam-derived solvents.
14 . The coated wire of claim 1 , wherein the coating composition has a dynamic viscosity ranging from about 500 cP to about 10,000 cP.
15 . The coated wire of claim 1 , wherein one or more caprolactam-derived solvents comprise N-ethyl caprolactam in an amount of at least 70 wt. %, based on a total weight of solvents in the coating composition.
16 . The coated wire of claim 1 , wherein one or more caprolactam-derived solvents comprise N-ethyl caprolactam in an amount of at least 90 wt. %, based on a total weight of solvents in the coating composition.
17 . The coated wire of claim 1 , wherein one or more caprolactam-derived solvents comprise N-ethyl caprolactam in an amount of at least 75 wt. %, based on a total weight of all caprolactam-derived solvents in the coating composition.
18 . The coated wire of claim 1 , wherein one or more caprolactam-derived solvents consist essentially of N-ethyl caprolactam.
19 . The coated wire of claim 1 , wherein one or more caprolactam-derived solvents consist of N-ethyl caprolactam.