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    4.
    发明专利
    未知

    公开(公告)号：DE59913529D1

    公开(公告)日：2006-07-20

    申请号：DE59913529

    申请日：1999-11-18

    Applicant: BASF AG

    Inventor： RIEGEL ULRICH ,  WEISMANTEL MATTHIAS ,  FRENZ VOLKER ,  DANIEL THOMAS ,  ENGELHARDT FRITZ

    IPC: A21B1/22 ,  C08F8/30 ,  A21B1/44 ,  A61F13/53 ,  A61L15/60 ,  C08J3/24 ,  C08K5/353 ,  C08L101/00 ,  D04H1/42 ,  D06M15/263

    Abstract: Liquid-absorbent polymers are prepared by a process for the gel and/or surface postcrosslinking of water-absorbent polymers by the polymer being treated with a surface postcrosslinking solution and being postcrosslinked and dried during and after the treatment by raising the temperature, wherein the surface postcrosslinking solution comprises as crosslinker a compound of the formula IwhereR1, R2, R3 and R4 are independently hydrogen, C1-C12-alkyl, C1-C12-alkenyl, C6-C12-aryl or C1-C12-alkoxy,R5 is C1-C16-alkyl, C1-C4-hydroxyalkyl, C6-C12-aryl, C1-C16-alkenyl or a group of the formula -(CH2)n-COOH or -(CH2)n-SO3H in the form of the acid or a respective metal salt, ammonium salt or triethanolammonium salt thereof or -(CH2-CH2-O-)m-R6,R6 is hydrogen or C1-C16-alkyl,n is from 1 to 10,m is from 1 to 20dissolved in an inert solvent,and are used in hygiene articles, packaging materials and nonwovens.

    Polymerized hydrogel comprising low amounts of residual monomers and by-products
    7.
    发明专利
    Polymerized hydrogel comprising low amounts of residual monomers and by-products 未知

    公开(公告)号：AU2003247669A8

    公开(公告)日：2004-01-19

    申请号：AU2003247669

    申请日：2003-07-01

    Applicant: BASF AG ,  PROCTER & GAMBLE

    Inventor： WEIDL CHRISTIAN H ,  FRENZ VOLKER ,  STEPHAN OSKAR ,  MERRIGAN STEVEN RAY ,  SCHECHTMAN LEE ARNOLD ,  GOLDMAN STEPHEN ALLEN ,  BECK MARTIN ,  GOERTH FELIX

    IPC: A61L15/58 ,  A61L15/60 ,  C08F6/00 ,  A61L24/04

    Abstract: The present invention relates to a process for making polymerized hydrogel, in particular adhesives, which are characterized by very low amount of residual starting monomer(s), impurity(s) and/or by-products which could be formed during polymerization, such as acrylamide, acrylonitrile or acrolein. After a first polymerization step, which is conducted from a reaction medium comprising starting monomer(s) and at least one polyol, the resulting hydrogel is then post-treated with a compound which chemically reacts with said residual monomer(s), impurity(s) and/or with said by-products the said polymerization could produce, to thereby reduce said residual starting monomer(s), impurity(s) and/or said by-products within said hydrogel. The present invention also relates to polymerized hydrogels, in particular adhesives, comprising 10-90 wt % water, 10-60 wt % cross-linked hydrophilic polymer made from starting monomer(s) comprising acrylic acid, and 10-80 wt % of at least one polyol, such hydrogel being prepared by polymerizing said starting monomer(s) in the presence of said water and said polyol(s), wherein such hydrogels contain less than 500 ppb, preferably less than 100 ppb, more preferably less than 50 ppb and most preferably less than 20 ppb of alpha,beta-unsaturated carbonyl by-product(s) derived from said polyol(s) during polymerization, and wherein the level of residual starting monomer(s) is below 200 ppm, preferably below 100 ppm, more preferably below 50 ppm, even more preferably below 20 ppm, and most preferably below 10 ppm.

    8.
    发明专利
    未知

    公开(公告)号：BR0116621A

    公开(公告)日：2003-12-23

    申请号：BR0116621

    申请日：2001-12-28

    Applicant: BASF AG

    Inventor： FRENZ VOLKER ,  HERFERT NORBERT ,  RIEGEL ULRICH ,  VOLZ WILLIAM E ,  MAJETTE THOMAS H ,  HILL JAMES M

    IPC: A61F13/53 ,  A61F5/44 ,  A61F13/15 ,  A61F13/49 ,  A61L15/60 ,  B01J20/26 ,  C08J3/12 ,  A61L15/18

    Abstract: The invention relates to non-water soluble hydrogels which can swell in water, and which are coated with steric or electrostatic spacers. Before being coated, the hydrogels comprise the following characteristics: absorbency under load (AUL) (0.7 psi) of at least 20 g/g, and gel strength of at least 1600 Pa. The coated hydrogels preferably have the following characteristics: centrifuge retention capacity (CRC) of at least 24 g/g, saline flow conductivity (SFC) of at least 30 x 10 cm s/g, and free swell rate (FSR) of at least 0.15 g/g s and/or a maximum vortex time of 160 s.

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