Method of making laminate sheets for printed circuit boards

Details Method of making laminate sheets for printed circuit boards Method of making laminate sheets for printed circuit boards

1974-03-05

1976-08-03

Powell, William A.

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

156329, 156330, 156335, 260 292M, 260 293, 427 96, 427412, 427407, 428273, 428391, 428436, 428288, 428396, 428447, 428302, 428429, 428901, C09J 504

Patent

active

039727653

ABSTRACT:
In preparing an epoxy resin laminate sheet by impregnating a nonwoven fabric of glass fiber with an epoxy resin to form a prepreg, laminating a predetermined number of so formed prepregs and pressing, while heating, the laminate, when the nonwoven fabric of glass fiber to be used as a substrate is treated with a liquid mixture containing a water-soluble phenol resin and a silane coupler prior to the impregnation step, a laminate sheet suitable for formation of a printed circuit board can be obtained at a low manufacturing cost. The so formed laminate sheet not only has excellent heat resistance, drilling workability and punching workability at room temperature but also is characterized by such an excellent property that when it is subjected to the boiling water treatment, the degree of reduction of electric properties such as the insulation resistance is very small and whitening of the substrate is not caused to occur.

REFERENCES:
patent: 2403872 (1946-07-01), Miller
patent: 2990307 (1961-06-01), Stalego
patent: 3046295 (1962-07-01), Lisanke et al.
patent: 3326716 (1967-06-01), Hurley et al.
patent: 3331885 (1967-07-01), Rider et al.
patent: 3554952 (1971-01-01), Plueddemann
patent: 3617613 (1971-11-01), Benzinger et al.
patent: 3794555 (1974-02-01), Sanjana
patent: 3839236 (1974-10-01), Foley et al.
"Coupling Agents," Dow Corning Bulletin 03-009, Jan. 1964, pp. 1-4.
Sterman et al., "Silane Coupling Agents etc.," Plastics, July 1963, pp. 1-8.

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