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    4.
    发明专利
    未知

    公开(公告)号：DE3429671A1

    公开(公告)日：1986-02-20

    申请号：DE3429671

    申请日：1984-08-11

    Applicant: BASF AG

    Inventor： GRASER FRITZ DR ,  STANGE ANDREAS DR

    IPC: A23J3/06 ,  A23L17/60 ,  B01D11/02 ,  B01J13/00 ,  B01J37/00 ,  C01B33/14 ,  C01B33/158 ,  C01B33/32 ,  C01B39/06 ,  B01D12/00 ,  B01J20/00

    Abstract: A process for the drying of inorganic hydrogels obtained from readily hydrolyzable compounds of the elements Al, Si, Ti, B, La, Zr, Cr, Sn, Th or Mg, and organic hydrogels based on gelatine, albumin or agar agar, from CO2, to give aerogels is easy to carry out industrially, and drying can be effected at from room temperature to 90 DEG C. The resulting aerogels are transparent and have a low bulk density and low thermal conductivity. The aerogels can be used as packing materials for liquid chromatography, as catalyst carriers, as substrates for enzymes and as adsorbents.

    5.
    发明专利
    未知

    公开(公告)号：DE4411311A1

    公开(公告)日：1995-10-05

    申请号：DE4411311

    申请日：1994-03-31

    Applicant: BASF AG

    Inventor： NILZ CLAUDIA DR ,  WINTER MANFRED ,  KROENER MICHAEL DR ,  STANGE ANDREAS DR ,  SCHUHMACHER RUDOLF DR

    IPC: C08F8/12 ,  D21H17/34 ,  D21H21/18 ,  D21H21/20 ,  C08F126/02

    Abstract: A process for producing long-shelf-life aqueous solutions of vinyl-amine-unit-containing polymers by the hydrolysis of N-vinyl-carbonamide-containing polymers with acids in an aqueous medium and removing the carboxylic acids separated from the polymers as esters from the aqueous polymer solution following hydrolysis and by the addition of at least stoichiometric quantities of at least one C1 to C6 alcohol and distilling the esters off from the reaction mixture. The invention also relates to the use of the long-shelf-life aqueous solutions of vinyl-amine-unit-containing polymers as dry and wet consolidating agents in paper manufacture.

    8.
    发明专利
    未知

    公开(公告)号：DE3927812A1

    公开(公告)日：1991-02-28

    申请号：DE3927812

    申请日：1989-08-23

    Applicant: BASF AG

    Inventor： FLORY KLAUS DR ,  STANGE ANDREAS DR ,  KROENER MICHAEL DR ,  SENDHOFF NORBERT DR

    IPC: C08G12/12 ,  C08G12/46 ,  D21H17/49 ,  D21H17/50

    Abstract: Cationic urea formaldehyde resins are obtained by condensation of urea and formaldehyde in a molar ratio of 1:1.5 to 3 in the presence of at least 1 mol% of polymerizates, obtained by polymerization of vinyl amine units, with Fikentscher K values of 5 to 300 in a quantity of 5 to 100 g/mol of urea in the end-product. The mixture is first a) precondensed at a pH of 8 to 14, then acidified and b) condensed at a pH of 1 to 5 until the onset of gel formation, c) 0.3 to 1.5 mol of formaldehyde per mol of urea used is added, d) subsequent condensation is carried out and e) the resin solution is then neutralized. The resins so obtained are used as additives in paper manufacture to increase the dry and wet strength of paper and reduce the loss of opacity of the whiteness of the paper.

    10.
    发明专利
    未知

    公开(公告)号：DE19526626A1

    公开(公告)日：1997-01-23

    申请号：DE19526626

    申请日：1995-07-21

    Applicant: BASF AG

    Inventor： DENZINGER WALTER ,  RUEBENACKER MARTIN DR ,  NILZ CLAUDIA DR ,  LORENCAK PRIMOZ DR ,  MOENCH DIETMAR DR ,  SCHUHMACHER RUDOLF DR ,  STANGE ANDREAS DR

    IPC: C08B37/00 ,  C08F8/12 ,  C08F261/04 ,  C08F263/02 ,  C08F283/06 ,  C08F291/00 ,  C09D7/45 ,  D21H17/34 ,  D21H17/37 ,  D21H21/10 ,  D21H21/14 ,  D21H21/16 ,  D21H21/18 ,  D21H21/20

    Abstract: Graft polymers obtainable by the radically initiated polymerisation of (A) monomers or monomer mixture of (a) 1 to 100 wt.% N-vinyl carboxylic acid amides of the formula (I) in which R , R = H and C1 to C6 alkyl, (b) 0 to 99 wt.% other monoethylenically unsaturated monomers copolymerisable with the monomers (a), and (c) 0 to 5 wt.% of at least two ethylenically unsaturated monomers with unconjugated double bonds in the molecule; in the presence of (B) polymers containing units of vinyl esters of saturated C1 to C4 carboxylic acids and/or vinyl alcohol units, or mixtures containing these polymers and polymers containing at least 3 alkylene oxide units or polytetrahydrofurane; in the ratio by weight (A) : (B) of (95 to 10) : (5 to 90), possibly followed by the separation of the group (II) from the polymerised monomers (I) of the graft polymer, with the formation of units of the formula (III); process for the production of the graft polymers and use of the graft polymers described above in the production of paper, paperboard and cardboard as a dry and wet strengthening agent, as a retention and dewatering agent and as a promoter in diketene gumming and as a starch cationisation agent, as a dispersant for pigments and as a creping auxiliary in the production of tissue papers.

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