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    • 4. 发明申请
    • Water-soluble polymer and additive for paper manufacture
    • 用于造纸的水溶性聚合物和添加剂
    • US20070208143A1
    • 2007-09-06
    • US11367487
    • 2006-03-06
    • Yoshiharu KimuraTakahiro Fujiwara
    • Yoshiharu KimuraTakahiro Fujiwara
    • C08F20/56
    • C08F20/56C08F2/001C08F2/10C08F220/06C08F220/34C08F220/56C08F222/02C08F230/08
    • The present invention provides a method for preparing a water soluble polymer, which comprises: a first step of polymerizing: (a) 60 to 99.5 mol % of at least one selected from acrylamide and methacrylamide, (b) 0.5 to 20 mol % of at least one selected from α,β-unsaturated monocarboxylic acid, α,β-unsaturated dicarboxylic acid and salts thereof, and (c) 1 to 20 mol % of at least one selected from a water soluble cationic monomer and a salt thereof, (d) 0.01 to 1 mol % of a chain transfer agent, and (e) 0.005 to 5 mol % of a crosslinkable monomer, in the presence of a persulfate-based catalyst to obtain a prepolymer; and a second step of further adding the persulfate-based catalyst to the prepolymer obtained in the first step and the residual monomer, followed by the polymerization and termination of the polymerization. Consequently, it is made possible to suppress a rapid increase in viscosity during the polymerization thereby to obtain a water soluble branched polymer having high molecular weight and low viscosity.
    • 本发明提供一种制备水溶性聚合物的方法,其包括:聚合的第一步骤:(a)60至99.5mol%的选自丙烯酰胺和甲基丙烯酰胺的至少一种,(b)0.5至20mol%的 选自α,β-不饱和一元羧酸,α,β-不饱和二羧酸及其盐中的至少一种,和(c)1〜20摩尔%的选自水溶性阳离子单体及其盐中的至少一种,(d )0.01〜1摩尔%的链转移剂,(e)0.005〜5摩尔%的交联性单体,在过硫酸盐系催化剂存在下,得到预聚物; 以及将第一步骤中得到的预聚物和残留单体进一步添加过硫酸盐系催化剂,然后聚合并终止聚合的第二工序。 因此,可以抑制聚合期间的粘度的快速增加,从而得到具有高分子量和低粘度的水溶性支链聚合物。
    • 8. 发明授权
    • Process for the production of optically active amino alcohols
    • 用于制备光学活性氨基醇的方法
    • US07038087B2
    • 2006-05-02
    • US10656617
    • 2003-09-04
    • Takahiro FujiwaraHideki NaraTsukasa Sotoguchi
    • Takahiro FujiwaraHideki NaraTsukasa Sotoguchi
    • C07C209/16C07C209/46C07C209/56
    • C07C269/00C07B2200/07C07C213/02C07C2601/08C07C2601/14Y02P20/55C07C215/44C07C271/24
    • An object of the present invention is to provide a process for the production of an optically active amino alcohol, particularly an optically active amino alcohol of a trans-form, being excellent in economy and efficiency, and suitable for industry using easily available and less expensive materials.The present invention relates to a process for the production of an optically active amino alcohol comprising the steps that an optically active hydroxy ester in a trans-form obtained by an asymmetric hydrogenation of an easily available β-keto ester is reacted with hydrazine, the resulting optically active hydrazinocarbonyl alcohol is subjected to a Curtius rearrangement in the presence of alcohol and protective group of amino group of the resulting optically active alkoxycarbonylamino alcohol is deprotected. As a result of the process for the production in accordance with the present invention, the objected substance is able to be prepared in a high optical purity and in a high yield.
    • 本发明的目的是提供一种制备光学活性氨基醇,特别是反式形式的光学活性氨基醇的方法,其经济性和效率优异,并且适用于易于获得和较便宜的工业应用 材料 本发明涉及一种制备光学活性氨基醇的方法,该方法包括以下步骤:通过易于获得的β-酮酯的不对称氢化获得的反式的光学活性羟基酯与肼反应,得到 光学活性肼基羰基醇在醇的存在下进行Curtius重排,并将得到的光学活性烷氧基羰基氨基醇的保护基的氨基脱保护。 作为根据本发明的生产方法的结果,可以以高光学纯度和高产率制备被
      反应物质。
    • 10. 发明授权
    • Papermaking internal sizing agent and use thereof
    • 造纸内部施胶剂及其用途
    • US08241462B2
    • 2012-08-14
    • US12670186
    • 2008-03-06
    • Kazunari SakaiTakahiro FujiwaraKazushige InaokaTakashi YamaguchiMasaki ItoYasunobu Ooka
    • Kazunari SakaiTakahiro FujiwaraKazushige InaokaTakashi YamaguchiMasaki ItoYasunobu Ooka
    • D21H17/37D21H17/41D21H17/42D21H17/43D21H17/44D21H17/45
    • D21H21/16D21H17/41D21H17/455D21H17/675
    • To provide a papermaking internal sizing agent capable of efficiently imparting sizing performance even in neutral papermaking which uses calcium carbonate as filler, and uses no aluminum sulfate or uses a small amount of aluminum sulfate, and also provide a paper or a paperboard obtained by using the papermaking internal sizing agent. The papermaking internal sizing agent comprises as an effective ingredient an amphoteric copolymer having hydrophobic groups and cationic groups, at least a part of the cationic groups being quaternized. Preferably, the amphoteric copolymer is obtained by polymerizing monomer ingredients that it essentially contain a hydrophobic monomer (A), a cationic monomer (B), and an anionic monomer (C) and that an anion equivalent of the monomer (C) is 0.1 to 90% of a cation equivalent of the monomer (B), in which a rate of quaternizing of the cationic groups is not less than 40% by mole. The paper or the paperboard contains the above papermaking internal sizing agent.
    • 提供即使在使用碳酸钙作为填料的中性造纸中也能有效赋予施胶性能,不使用硫酸铝或使用少量硫酸铝的造纸内施胶剂,并且还提供通过使用碳酸钙作为填料获得的纸或纸板 造纸内部施胶剂。 造纸内部施胶剂包括具有疏水基团和阳离子基团的两性共聚物作为有效成分,至少一部分阳离子基团被季铵化。 优选地,两性共聚物通过使其基本上含有疏水单体(A),阳离子单体(B)和阴离子单体(C)的单体成分聚合而获得,并且单体(C)的阴离子当量为0.1〜 单体(B)的阳离子当量的90%,其中阳离子基团的季铵化率不低于40摩尔%。 纸或纸板包含上述造纸内部施胶剂。