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19 条记录 (耗时 0.019 秒)

    Cationic urea/formaldehyde resins, their preparation and their use in the paper industry
    1.
    发明授权
    Cationic urea/formaldehyde resins, their preparation and their use in the paper industry 失效
    阳离子脲/甲醛树脂，其制备及其在造纸工业中的应用

    公开(公告)号：US5478656A

    公开(公告)日：1995-12-26

    申请号：US408408

    申请日：1995-03-22

    申请人： Klaus Flory ,  Andreas Stange ,  Michael Kroener ,  Norbert Sendhoff

    发明人： Klaus Flory ,  Andreas Stange ,  Michael Kroener ,  Norbert Sendhoff

    IPC分类号： C08G12/12 ,  C08G12/46 ,  D21H17/49 ,  D21H17/50 ,  B32B27/42

    CPC分类号： C08G12/46 ,  Y10T428/31949 ,  Y10T428/31964

    摘要： Cationic urea/formaldehyde resins are obtainable by condensing urea and formaldehyde in a molar ratio of from 1:1.5 to 1:3 in the presence of polymers which contain not less than 1 mol % of polymerized vinylamine units and have Fikentscher K values of from 5 to 300, in an amount of from 5 to 50 g per mole of urea in the end product, where the mixture is first a) precondensed at a pH of from 8 to 14, then acidified and b) condensed at a pH of from 1 to 5 until gel formation begins, c) then from 0.3 to 1.5 moles of formaldehyde are added per mole of urea used, d) post-condensation is carried out and e) the resin solution is subsequently neutralized. The resins thus obtained are used in papermaking as assistants for increasing the dry and wet strength of paper and result in less dulling of the whiteness of the paper.

    摘要翻译： 阳离子脲/甲醛树脂可以通过在含有不少于1摩尔％的聚合乙烯胺单元的聚合物存在下，以1:1.5至1:3的摩尔比冷凝脲和甲醛，并且具有5的Fikentscher K值 至300，其量为最终产物中每摩尔尿素5至50g，其中混合物首先a）在8至14的pH下预缩合，然后酸化并b）在pH为1时冷凝 至5，直到凝胶形成开始，c）然后每摩尔使用的尿素加入0.3至1.5摩尔的甲醛，d）进行后冷凝，e）随后中和树脂溶液。 由此获得的树脂用于造纸中作为助剂以增加纸张的干湿强度，并且导致纸的白度较少的钝化。

    Catonic urea/formaldehyde resins, their preparation and their use in the paper industry
    2.
    发明授权
    Catonic urea/formaldehyde resins, their preparation and their use in the paper industry 失效
    阳离子脲/甲醛树脂，其制备及其在造纸工业中的应用。

    公开(公告)号：US5554718A

    公开(公告)日：1996-09-10

    申请号：US775928

    申请日：1991-11-06

    申请人： Klaus Flory ,  Andreas Stange ,  Michael Kroener ,  Norbert Sendhoff

    发明人： Klaus Flory ,  Andreas Stange ,  Michael Kroener ,  Norbert Sendhoff

    IPC分类号： C08G12/12 ,  C08G12/46 ,  D21H17/49 ,  D21H17/50 ,  C08G2/26 ,  C08G14/02

    CPC分类号： C08G12/46 ,  Y10T428/31949 ,  Y10T428/31964

    摘要： Cationic urea/formaldehyde resins are obtainable by condensing urea and formaldehyde in a molar ratio of from 1:1.5 to 1:3 in the presence of polymers which contain not less than 1 mol % of polymerized vinylamine units and have Fikentscher K values of from 5 to 300, in an amount of from 5 to 50 g per mole of urea in the end product, where the mixture is first a) precondensed at a pH of from 8 to 14, then acidified and b) condensed at a pH of from 1 to 5 until gel formation begins, c) then from 0.3 to 1.5 moles of formaldehyde are added per mole of urea used, d) post-condensation is carried out and e) the resin solution is subsequently neutralized. The resins thus obtained are used in papermaking as assistants for increasing the dry and wet strength of paper and result in less dulling of the whiteness of the paper.

    摘要翻译： PCT No.PCT / EP90 / 01399 Sec。 371日期1991年11月6日 102（e）1991年11月6日，PCT提交1990年8月22日PCT公布。 出版物WO91 / 02762 日期1991年3月7日阳离子脲/甲醛树脂可通过在含有不少于1摩尔％的聚合乙烯胺单元的聚合物存在下将脲和甲醛以1:1.5至1:3的摩尔比缩合而得到，并具有Fikentscher K值为5至300，最终产物中每摩尔尿素为5至50g，其中混合物首先a）在8至14的pH下预缩合，然后酸化并b）在 pH为1至5，直到凝胶形成开始，c）然后每摩尔使用的尿素加入0.3至1.5摩尔的甲醛，d）进行后冷凝，e）随后中和树脂溶液。 由此获得的树脂用于造纸中作为助剂以增加纸张的干湿强度，并且导致纸的白度较少的钝化。

    Bridged, water-soluble copolymers, their preparation and their use
    9.
    发明授权
    Bridged, water-soluble copolymers, their preparation and their use 失效
    桥接，水溶性共聚物，其制备及其用途

    公开(公告)号：US4981913A

    公开(公告)日：1991-01-01

    申请号：US409747

    申请日：1989-09-20

    申请人： Dietmar Moench ,  Andreas Stange ,  Joerg Liebe ,  Heinrich Hartman ,  Franz Merger ,  Manfred Schwartz

    发明人： Dietmar Moench ,  Andreas Stange ,  Joerg Liebe ,  Heinrich Hartman ,  Franz Merger ,  Manfred Schwartz

    IPC分类号： C08C19/00 ,  C08F8/12 ,  C08F8/28 ,  D21H17/37

    CPC分类号： C08F8/12 ,  C08F2800/10 ,  C08F2810/50

    摘要： Bridged, water-soluble copolymers are obtainable by(A) copolymerization of a monomer mixture of(a) from 50 to 99 mol % of acrylamide and/or methacrylamide,(b) from 50 to 1 mol % of a monoethylenically unsaturated monomer containing actual groups and(c) from 0 to 20 mol % of monomers which differ from (a) and (b), in the presence of a polymerization initiator under conditions such that the acetal groups of the monomers (b) undergo virtually no hydrolysis,(B) hydrolysis of the acetal groups of the monomers (b), present as copolymerized units in the copolymers (A),(C) condensation of the copolymers (B) containing aldehyde groups at a pH above 5, at most to a degree such that the resulting condensates are still water-soluble and(D) stopping of the condensation reaction by adding acid until the pH reaches 3 or less,and are used as paper stock additives in papermaking for increasing the wet strength of paper.

    摘要翻译： 桥接的水溶性共聚物可通过（A）（a）50至99mol％的丙烯酰胺和/或甲基丙烯酰胺的单体混合物共聚获得，（b）50至1mol％的单烯属不饱和单体含有实际 基团和（c）0〜20摩尔％的不同于（a）和（b）的单体，在聚合引发剂存在下，使单体（b）的缩醛基基本上不经水解的条件下， B）在共聚物（A），（C）中作为共聚单元存在的单体（b）的缩醛基团的水解在pH5以上含有醛基的共聚物（B）的缩合最多至一定程度 所得缩合物仍然是水溶性的，（D）通过加入酸直到pH达到3以下停止缩合反应，并且在造纸中用作增加纸的湿强度的纸浆添加剂。