| 摘要 |
A sizing composition and a method of sizing a cellulosic fibre material, such as paper, board or paper board, are described. The sizing composition comprises an aqueous dispersion of a rosin material and is characterised in that it also contains (a) 0.05-20 % by weight, based on the dry weight of the composition of a dicarboxylic acid derivative with the general formula (I): R1OOC-Q-COOR2; where R1 and R2 which are the same or different represent H, M, where M is a metal of Groups IA or IIA, or a straight or branched alkyl or alkenyl group having 1-30 carbon atoms; Q represents (i) R3 which is a straight alkylene group or alkenylene group of the formula: -CnH2n-2z-, where n = 0-12 and z = 0-3; (ii) Formula (II), where R3 is as defined above and R4 is a straight or branched alkyl or alkenyl group having 1-30 carbon atoms; with the proviso that the compound of formula (I) includes at least 6 and at most 34 carbon atoms in total; and (b) an aluminium compound which is selected from the group consisting of: aluminium sulphate; aluminium polymers of the general formula (III): [Al(OH)x(A)(3-x)]n; aluminium polymers of the general formula (IV): [Al(OH)x(H3PO4)y (A)(3-x)]n; where A = Cl<->, NO3<->, HCOO<->, CH3COO<->; aluminium polymers of the general formula (V): [Al(OH)x(SO4)(3-x)/2]n; aluminium polymers of the general formula (VI): [Al(OH)x(H3PO4)y (SO4)(3-x)/2]n; where "x" is in the range 0.03 to 2.7, "y" in the range 0.01 to 0.8 and n ≥ 2; and mixtures of these. According to the method the sizing composition is added to a cellulosic fibre material in an amount of 0.01-10 % by weight, calculated as dry sizing agent on dry cellulosic fibres. |
