Even, Thomas E.; Bishop, Stephen K.; Perkey, Lewis M.;

Copper-clad MC4 unsaturated polyester resin

Metal foil laminates of an unsaturated polyester resin, MC4, characterized by high performance electrical, physical and mechanical properties and useful for electronic circuit boards, low impedence microwave boards and E.M.I.-R.F.I. shielding, and a process for preparing such a metal-clad laminate.

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What is claimed is:

1. A metal foil laminate, comprising:

a sheet of an unsaturated polyester resin blend having opposite first and second faces, a first sheet of metal foil.

2. The metal foil laminate as set forth in claim 1, said blend further comprising a flame-retardant material.

3. The metal foil laminate as set forth in claim 2, wherein said flame-retardant material is a halogenated vinyl monomer.

4. The metal foil laminate as set forth in claim 1, said multi-tier catalyst system consisting of three or four tiers.

5. The metal foil laminate as set forth in claim 4, said blend additionally comprising a flame-retardant material and a structural reinforcement means.

6. The metal foil laminate as set forth in claim 1, said blend additionally comprising a structural reinforcement means.

7. The metal foil laminate as set forth in claim 6, said structural reinforcement means comprising organic or inorganic, woven or non-woven, randomly oriented or non-randomly oriented material.

8. The metal foil laminate as set forth in claim 7, said blend additionally comprising: a flame-retardant material; a filler; and, an adhesion promoter.

9. The metal foil laminate as set forth in claim 1, said blend additionally comprising a filler.

10. The metal foil laminate as set forth in claim 1, said blend additionally comprising an adhesion promoter.

11. The metal foil laminate as set forth in claim 1, wherein said polyester resins are prepared from phthalic anhydride or maleic anhydride, and propylene glycol, ethylene glycol, or diethylene glycol.

12. The metal foil laminate as set forth in claim 1, wherein said first sheet of metal foil is copper;

13. The metal foil laminate as set forth in claim 1 additionally comprising a second sheet of metal foil bonded to said second face.

14. The metal foil laminate as set forth in claim 13 wherein said second sheet of metal foil is copper foil.

15. The metal foil laminate as set forth in claim 13, wherein both said first metal foil and said second metal foil are copper metal foil.