| 摘要 |
<p>A composition suitable for impregnating paper comprises a mixed aqueous suspension of a copolymer of which the major constituents are an alkyl acrylate and an unlike copolymerizable monomer selected from acrylic acids, acrylamides, vinyl pyridines, dialkyl amino alkyl acrylates, glycidyl alkyl acrylates, and allyl substituted melamines, and a modifying heat-reactive resin in an amount by weight based on the weight of the total composition of 25%-0,25% selected from phenol-, urea- and melamine-formaldehyde resins. The copolymer may include vinyl acetate as an additional monomer. The composition may also include a butadienestyrene copolymer latex in an amount by weight of up to 75% of the total impregnating composition. Examples describe the use of copolymers of ethyl acrylate and methacrylic acid, of ethyl acrylate and glycidyl methacrylate and of butyl acrylate, vinyl acetate and acrylic acid.</p> |
