| 摘要 |
FIELD: papermaking. ^ SUBSTANCE: pre-impregnate is manufactured by impregnation of crude paper with thermosetting formaldehyde-free resin until content thereof 10 to 70%. Residual moisture content in pre-impregnate is 2-3%. Resin contains: at least one radical-polymerization polymer with less than 5% of alpha,beta-ethylenically unsaturated mono- or dicarboxylic acid; at least one radical-polymerization polymer containing more than 5% of alpha,beta-ethylenically unsaturated mono- or dicarboxylic acid; and at least one alkanolamine with at least two hydroxyl groups; or resin contains at least one radical-polymerization polymer with 5-100%, particularly 5-50%, or more particularly 10-40% of alpha,beta-ethylenically unsaturated mono- or dicarboxylic acid and at least one above alkanolamine. ^ EFFECT: improved quality of surface, printing properties, delamination resistance, and varnishing capacity. ^ 16 cl, 3 dwg, 2 tbl, 2 ex |
