Process for producing a prepreg of a glass fiber cloth

Details Process for producing a prepreg of a glass fiber cloth Process for producing a prepreg of a glass fiber cloth

1984-07-05

1985-03-26

Lawrence, Evan K.

Coating processes

Nonuniform coating

Applying superposed diverse coatings or coating a coated base

427284, 427289, 427292, 427314, B05D 302, B05D 312

Patent

active

045073376

ABSTRACT:
The process for producing a prepreg of a glass fiber cloth according to the present invention is characterized by heat-treating the inner portions of the selvages of the glass fiber cloth to remove the residual stress of glass fibers in the glass fiber cloth, coating the heat-treated portions of the glass fiber cloth with a solution of a saturated polyester type resin of 150.degree. to 180.degree. C. softening point insoluble in a thermosetting resin varnish to be later used for impregnation so that the amount coated becomes 4 to 10% by weight as resin based on the weight of the portions of glass fiber cloth coated, drying the resulging glass fiber cloth, removing the selvage portions of the glass fiber cloth by cutting, impregnating the selvages-removed glass fiber cloth with the above mentioned thermosetting resin varnish, and drying the impregnated glass fiber cloth. In the prepreg produced according to the present invention, the thickness is uniform across the entire width; both selvages form a linear shape and are not rugged; there is neither tearing-off of glass fibers at the selvages nor adhesion of torn fibers to other portions and hence no quality deterioration of prepreg is incurred. Therefore, the prepreg of the present invention can be advantageously used for production of copper-clad laminates.

REFERENCES:
patent: 3121018 (1964-02-01), Wood, Jr. et al.
patent: 4101693 (1978-07-01), Tsen et al.

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