초록 ▼

A continuous process for producing reinforced resin laminates comprising the steps of impregnating a fibrous substrate with a liquid resin which is free of volatile solvent and is capable of curing without generating liquid and gaseous byproducts, laminating a plurality of the resin-impregnated subs

A continuous process for producing reinforced resin laminates comprising the steps of impregnating a fibrous substrate with a liquid resin which is free of volatile solvent and is capable of curing without generating liquid and gaseous byproducts, laminating a plurality of the resin-impregnated substrates into a unitary member, sandwiching the laminate between a pair of covering sheets, and curing the laminate between said pair of covering sheets without applying appreciable pressure. The improvement comprises adjusting the final resin content in said resin impregnated substrate at 10 to 90% by weight based on the total weight of said impregnated substrate.

대표청구항 ▼

In a continuous process for producing reinforced resin laminates comprising the steps of impregnating a cellulosic fibrous substrate with a liquid thermosetting unsaturated polyester resin which is free of volatile solvent and is capable of curing without generating liquid and gaseous by-products, l

In a continuous process for producing reinforced resin laminates comprising the steps of impregnating a cellulosic fibrous substrate with a liquid thermosetting unsaturated polyester resin which is free of volatile solvent and is capable of curing without generating liquid and gaseous by-products, laminating a plurality of the resin-impregnated substrates into a unitary member, sandwiching the laminate between a pair of covering sheets, and curing the laminate while supporting the same between said pair of covering sheets without applying any appreciable pressure, the improvement comprising: (a) pre-impregnating said substrate with a pre-impregnating liquid comprising a mixture or condensate of: (i) methylol melamine and/or methylol guanamine, and (ii) a higher aliphatic derivative having at least one group capable of condensing with said methylol group; and (b) adjusting the final resin content in said resin-impregnated substrate at 10 to 90% by weight based upon the total weight of said resin-impregnated substrate.