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    • 9. 发明授权
    • Paper making process utilizing fillers with hardened envelopes of
cationic starch
    • 造纸工艺利用具有硬化包装的阳离子淀粉的填料
    • US4710270A
    • 1987-12-01
    • US645527
    • 1984-08-29
    • Olof SundenAgneta Sunden
    • Olof SundenAgneta Sunden
    • D21H17/28D21H17/27D21H17/29D21H17/30D21H17/43D21H17/63D21H17/65D21H17/66D21H17/67D21H17/69D21H3/20
    • D21H17/27D21H17/29D21H17/30D21H17/43D21H17/65D21H17/66D21H17/69
    • A paper making process with improved retention and binding of fillers is characterized by the use of an amphoteric mucous compound as binder. The preferred compound is the reaction product between cationic starch (CS) of low charge density and a polysaccharide acid such as carboxymethyl cellulose (CMC). This compound has amphoteric and mucous character and should be used for enveloping fillers, while in a unique transient structure. This structure is characterized by filler particles being enclosed and finely distributed in droplets of the highly hydrated but substantially water-insoluble mucous compound. According to the invention this transient structure should further be reorganized to a less hydrated and more resistant gel structure, still enclosing the filler. This gel structure can stand the draining forces on a paper machine wire screen. This structural reorganization is achieved by reaction with colloidal particles, especially of polyaluminum-oxy-citrate compounds. The process yields paper of high strength and filler retentions of more than 90% at a single wire passage even at extreme filler contents of 30-60% of the paper weight.
    • 具有改进的填料保留和结合的造纸方法的特征在于使用两性粘液化合物作为粘合剂。 优选的化合物是低电荷密度的阳离子淀粉(CS)和多糖酸如羧甲基纤维素(CMC)之间的反应产物。 该化合物具有两性和粘性特征,应用于包封填料,同时具有独特的瞬态结构。 该结构的特征在于填充剂颗粒被包封并精细分布在高度水合但基本上不溶于水的粘液化合物的液滴中。 根据本发明,这种瞬态结构应进一步重新组织成仍然包封填料的较少水合和更耐性的凝胶结构。 这种凝胶结构可以承受造纸机丝网上的排水力。 这种结构重组是通过与胶体颗粒,特别是聚 - 氧 - 柠檬酸铝化合物的反应来实现的。 该方法即使在纸张重量的30-60%的极端填料含量下,也可以在单个丝线通道上产生高达90%以上的高强度和填料保持力的纸张。