Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Patent
1988-09-23
1993-12-28
Bleutge, John C.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
525387, 525417, C08L 5500
Patent
active
052740269
ABSTRACT:
Curable polycycloolefin resin solutions having particular utility in the fabrication of printed circuit boards are disclosed. A solvent soluble polymer is typically solution polymerized from norbornene-type monomers in the presence of a metathesis catalyst package. This polymer may then be purified by precipitation and redissolution. A curing agent, such as a high activation temperature peroxide can then be added to the solution and then this curing agent containing solution can be used to impregnate a suitable substrate such as a fiberglass cloth. The impregnated substrate can then be dried, preferably at temperatures above the glass transition temperature of the polycycloolefin but below the activation temperature of the curing agent. Then one or more prepregs can be stacked and laminated to conductive foil at a temperature high enough to activate the curing agent. Printed circuit boards are obtained which have good resistance to organic solvents such as methylene chloride and to molten solder and which also display good electrical properties such as dielectric constant less than about 3.5 at 1 MHz and a dissipation constant less than about 0.005 at 1 MHz.
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Benedikt George M.
Smith David J.
Bleutge John C.
Dunlap Thoburn T.
Robbins Beatrice N.
Sweet Mark
The B. F. Goodrich Company
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