PRODUCTION OF PREPREG

Japanese Patent JP3307440

B2

PURPOSE: To obtain a method for producing a prepreg reduced in bubble content to a great extent with a high productivity at a high speed.
CONSTITUTION: In a prepreg production method in which a thermosetting resin varnish is infiltrated into a continuous-length glass fabric substrate and dried, a single-face solvent application is conducted wherein a solvent or diluted thermosetting resin varnish having a viscosity of 5cps or less is uniformly applied on one surface of the glass fabric substrate in the width direction thereof in a contact state; an impregnation with solvent is carried out wherein this is dipped in the solvent or diluted thermosetting resin varnish having a viscosity of 5cps or less; after that, the solvent or diluted thermosetting resin varnish having a viscosity of 5cps or less adhering to the glass fabric substrate is partially removed so as to be contained by 15-30 pts.wt. per 100 pts.wt. of only the glass fabric substrate; this is used as a pre-impregnated glass fabric substrate; this is impregnated with a thermosetting resin varnish to be used as a varnish-impregnated glass fabric substrate; and this is dried under heat to be produced as a prepreg.

WO/2014/085409	INFUSIBLE UNIDIRECTIONAL FABRIC
JPH039813	INFILTRATION METHOD AND ITS DEVICE FOR VARNISH
JPH02300239	PREPARATION OF PREPREG MATERIAL AND ITS APPARATUS

Yoshihiko Sekine
Hiroyuki Matsumoto
Takaaki Fukai
Hiroyuki Urabe
Katsuro Okabe
Kenji Ishii

JP32194392A

July 24, 2002

December 01, 1992

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Mitsubishi Gas Chemical Co., Ltd.

B29B15/12; B29B11/16; C08J5/24; H05K1/03; B29K105/08; (IPC1-7): B29B11/16

JP63272513A
JP6399910A

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