中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

7 records (took 0.021 seconds)

    METHOD FOR PREPARING WHITE PAPER
    7.
    发明授权
    METHOD FOR PREPARING WHITE PAPER 有权
    制备白纸的方法

    公开(公告)号：EP2596170B1

    公开(公告)日：2018-05-02

    申请号：EP11735806.9

    申请日：2011-07-22

    Applicant: Archroma IP GmbH

    Inventor： GRETHER-SCHENE, Heidrun ,  KLEIN, Cédric ,  BREVEAUD, Frederic ,  ATKINSON, David ,  JACKSON, Andrew, Clive

    IPC: D21H17/09 ,  D21H21/28 ,  D21H21/30 ,  D21H21/32

    CPC classification number: D21H17/09 ,  D21H21/28 ,  D21H21/30 ,  D21H21/32

    Abstract: Object of the invention is the method for preparing white paper which comprises adding to the pulp mass an aqueous formulation comprising a) at least one optical brightener of formula (I) in which the anionic charge on the brightener is balanced by a cationic charge composed of one or more identical or different cations selected from the group consisting of hydrogen, an alkali metal cation, alkaline earth metal, ammonium, ammonium which is mono-, di-, tri- or tetrasubstituted by a C1-C4 linear or branched alkyl radical, ammonium which is mono-, di-, tri- or tetrasubstituted by a C1-C4 linear or branched hydroxyalkyl radical, ammonium which is, di-, tri- or tetrasubstituted by a mixture of C1-C4 linear or branched alkylradical and linear or branched hydroxyalkyl radical or mixtures of said compounds, wherein R1 and R1' may be the same or different, and each is hydrogen, C1-C4 linear or branched alkyl, C2-C4 linear or branched hydroxyalkyl, CH2CO2-, CH2CH2CONH2 or CH2CH2CN, R2 and R2' may be the same or different, and each is C1-C4 linear or branched alkyl, C2-C4 linear or branched hydroxyalkyl, CH2CO2-, CH(CO2-)CH2CO2-, CH(CO2-)CH2CH2CO2-, CH2CH2SO3-, CH2CH2CO2-, CH2CH(CH3)CO2-, benzyl, or R1 and R2 and/or R1' and R2', together with the neighboring nitrogen atom signify a morpholine ring; R3 signifies hydrogen, -CO2- or -SO3- and p is 0, 1 or 2, and b) at least one shading dye of formula (II) in which R4 signifies H, methyl or ethyl, R5 signifies paramethoxyphenyl, methyl or ethyl, M signifies a cation selected from the group consisting of hydrogen, an alkali metal cation, alkaline earth metal, ammonium, ammonium which is mono-, di-, tri- or tetrasubstituted by a C1-C4 linear or branched alkyl radical, ammonium which is mono-, di-, tri- or tetrasubstituted by a C1-C4 linear or branched hydroxyalkyl radical, ammonium which is, di-, tri- or tetrasubstituted by a mixture of C1-C4 linear or branched alkylradical and linear or branched hydroxyalkyl radical or mixtures of said compounds, c) optionally one or more auxiliaries and d) water.

Patent Agency Ranking