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    PRODUCTION OF PAPER, THICK PAPER OR CARDBOARD HAVING HIGH DRY STRENGTH
    4.
    发明专利
    PRODUCTION OF PAPER, THICK PAPER OR CARDBOARD HAVING HIGH DRY STRENGTH 失效

    公开(公告)号：JPS6440694A

    公开(公告)日：1989-02-10

    申请号：JP18373288

    申请日：1988-07-25

    Applicant: BASF AG

    Inventor： ANDOREASU SHIYUTANGE ,  HANSUUYURUGEN DEEGEN ,  UERUNERU AUHORUN ,  FUORUKUMAA UEEBERUNDERUFUAA ,  MIHAERU KUREENAA ,  HAINRITSUHI HARUTOMAN

    IPC: D21H17/34 ,  D21H17/28 ,  D21H17/45 ,  D21H21/18

    Abstract: PURPOSE: To produce the objective paper by adding a starch and a specific dry strength agent to a paper stock, dehydrating the resultant paper stock, improving the dry strength, increasing the affinity of the starch during adsorption onto fibers in the paper stock and reducing the CSB load of wastewater. CONSTITUTION: An aqueous solution from a mixture of (A) an enzymatically digested starch having 20-2,000 mPa.s viscosity (measured in a 7.5% aqueous solution at 45 deg.C temperature) and (B) a cationic polymer containing (i) diallyldimethylammonium chloride, (ii) N-vinylamine or (iii) an N- vinylimidazoline represented by formula I (R is H, a 1-18C alkyl or formula II; R and R are each H, a 1-4C alkyl or Cl; R is H, a 1-18C alkyl or formula III or formula IV; R and R are each H or a 1-4C alkyl; X is an acid residue) as characteristic copolymerized monomers and having >=30 value of K (measured by the Fikentscher method) as a dry strength agent is added to a paper stock and the resultant paper stock is then dehydrated while forming a sheet thereof to produce the objective paper.

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