| 摘要 |
PCT No. PCT/FI84/00040 Sec. 371 Date Dec. 19, 1984 Sec. 102(e) Date Dec. 19, 1984 PCT Filed May 21, 1984 PCT Pub. No. WO84/04553 PCT Pub. Date Nov. 22, 1984.A paper material has been invented that contains cellulose substituted by means of N-methylol compounds. As N-methylol compounds may be used, e.g., reaction products of urea, glyoxal, and formaldehyde, methylolated melamines, and N-methylol-acrylamide copolymers. The paper is manufactured best by impregnating paper with an aqueous solution or dispersion of a N-methylol compound and by drying it at 130 DEG to 200 DEG C. in order to produce condensation. Papers in accordance with the invention have good properties of strength against decomposition and wet strength, which properties can be adjusted readily by varying the degree of substitution or cross-linking of the cellulose. The papers are particularly well suitable, e.g., for the manufacture of plant-growing pots and corrugated fibreboard. |
