Prepreg which is produced by impregnating a base paper with...

D - Textiles – Paper – 21 – H

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D21H 19/44 (2006.01) D21H 23/24 (2006.01) D21H 27/26 (2006.01)

Patent

CA 2518942

Disclosed are prepregs which can be obtained by impregnating a raw paper with a thermally crosslinkable impregnation combination, and methods for the production thereof. The impregnation combination contains a thermally crosslinkable, formaldehyde-free resin solution and a polymer dispersion. The mixing ratio between the resin solution and the polymer dispersion in the impregnation combination ranges between 45:55 and 10:90 (solid:solid). After drying, the prepreg has a degree of crosslinking of no less than 10 percent but no more than 85 percent and a residual moisture of 2 to 3 percent by weight. The inventive prepregs are provided with better properties than previously known formaldehyde-containing and formaldehyde-free prepregs regarding printability and surface bonding strength (ripping resistance) as early as the moment the prepregs leave the paper machine while maintaining great surface density (great ability to receive lacquer) and dimensional stability/flatness.

L'invention se rapporte à des préimprégnés productibles par imprégnation d'un papier brut au moyen d'une composition d'imprégnation à réticulation thermique, ainsi qu'à des procédés de production de ces préimprégnés. La composition d'imprégnation contient une solution de résine exempte de formaldéhyde, à réticulation thermique, ainsi qu'une dispersion polymère. Le rapport de mélange entre la solution de résine et la dispersion polymère dans la composition d'imprégnation est compris entre 45:55 et 10:90 (solide-solide). Après une opération de séchage, le préimprégné présente un degré de réticulation minimum de 10 % et maximum de 85 %, ainsi qu'une humidité résiduelle comprise entre 2 et 3 % en poids. Les préimprégnés selon l'invention présentent, dès leur sortie de la machine à papier, de meilleures propriétés en termes d'imprimabilité et de résistance à l'arrachage (cohésion) que les préimprégnés selon l'art antérieur qui contiennent ou non des formaldéhydes. Les préimprégnés selon l'invention présentent en outre une densité superficielle élevée (ce qui facilite l'application de vernis), ainsi qu'une stabilité dimensionnelle/planéité.

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