| 摘要 |
A method of forming an impregnated fibrous sheet comprising impregnating a fibrous material with a tin catalyst to form a catalyst-impregnated material, treating the catalyst-impregnated material with a polyisocyanate composition to form a polyisocyanate-impregnated fibrous material, and curing the polyisocyanate-impregnated fibrous material to provide a resin-impregnated fibrous sheet. Laminated materials and a method of producing the same are also provided.
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