Inorganic sheet laminate
View Patent ↗A laminate of inorganic sheet and polyester resin having an overall thickness of 5 to 25 mils and having an elongation at break in both the cross direction and machine direction of at least 25%.
1. A laminate of inorganic sheet and polyester resin having an overall thickness of 5 to 25 mils and having an elongation at break in both the cross direction and machine direction of at least 25%.
2. The laminate of claim 1 wherein the elongation at break in the cross direction is at least 30%.
3. The laminate of claim 2 wherein the thickness of the resin in the laminate is greater than the thickness of any individual inorganic sheet in the laminate.
4. The laminate of claim 1 wherein the inorganic sheet is a paper comprising an inorganic mineral, an inorganic reinforcement, and a binder.
5. The laminate of claim 4 wherein the inorganic mineral includes aluminum silicate.
6. The laminate of claim 4 wherein the inorganic reinforcement includes glass fiber.
7. The laminate of claim 4 wherein the binder includes acrylonitrile latex.
8. The laminate of claim 1 wherein the polyester resin is poly(ethylene terephthalate).
9. The laminate of claim 8 wherein the poly(ethylene terephthalate) includes a comonomer selected from the group of diethylene glycol, cyclohexanedimethanol, poly(ethylene glycol), glutaric acid, azelaic acid, sebacic acid, and isophthalic acid.
10. The laminate of claim 8 wherein the poly(ethylene terephthalate includes a branching agent selected from the group of trimesic acid, pyromellitic acid, trimethylolpropane, trimethyloloethane, and pentaerythritol.
11. The laminate of claim 1 wherein the polyester resin is poly(ethylene naphthalate).
12. The laminate of claim 1 wherein the polyester resin is sandwiched between two inorganic sheets.
13. The laminate of claim 12 wherein the polyester resin sandwiched between two inorganic sheets includes a layered combination of resins.
14. An electrical device containing an electrical conductor and an insulating laminate comprising inorganic sheet and polyester resin, said laminate having an overall thickness of 5 to 25 mils and having an elongation at break in both the cross direction and the machine direction of at least 25%.
15. The electrical device of claim 14 wherein the laminate has an elongation at break in the cross direction of at least 30%.
16. The electrical device of claim 14 which is a transformer.