Laminate composition for producing reduced curl flat thin core laminate
View Patent ↗Copper clad laminates having reduced laminate curl include copper foil with a tensile strength of less than 47 ksi.
1. A copper-clad laminate comprising a resin core having a first surface and a second surface, and a copper foil joined to at least one surface of the core, wherein the copper foil has a tensile strength of less than 47 ksi measured at 20° C., and wherein the core has a thickness of 4 mils or less and the copper foil is selected from 1 oz copper foil or 0.5 oz copper foil.
2. The copper-clad laminate of claim 1 wherein the copper foil has a tensile strength of less than 45 ksi.
3. The copper-clad laminate of claim 1 wherein the copper foil has a tensile strength of about 42 ksi.
4. The laminate of claim 1 wherein the resin is a FR4 resin.
5. The copper-clad laminate of claim 1 wherein a copper foil is joined to both the core first surface and the core second surface.
6. The copper-clad laminate of claim 1 wherein the resin core includes woven fiber.
7. The copper-clad laminate of claim 1 having a curl of less than 0.25 inches measured on a flat plane.
8. The copper clad laminate of claim 1 wherein the resin core is a prepreg core.
9. A copper-clad laminate comprising a prepreg core having a first surface and a second surface, and a copper foil joined to at least one surface of the prepreg core, wherein the copper foil has a tensile strength of less than 47 ksi measured at 20° C., wherein the prepreg core has a thickness of 4 mils or less, and wherein the copper foil is 0.5 oz copper foil.