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    34.
    发明专利
    未知

    公开(公告)号：FI57775B

    公开(公告)日：1980-06-30

    申请号：FI108371

    申请日：1971-04-20

    Applicant: BASF AG

    Inventor： MAYER JOHANN ,  SCHMIDT-HELLERAU CHRISTOF

    IPC: C08G14/06 ,  C09J161/34 ,  C09J3/16

    Abstract: Procedure for obtaining wood glues, which per mole of melamine, or a mixture of at least 15 mole% melamine and up to 85 mole% urea, contain 1.7 to 3.0 moles of formaldehyde and 0.05 mol to 0.2 mol of a phenol, characterized in that in each case 1 mol of melamine and/or urea and from 1.5 to 2.5 mol of formaldehyde are condensed in a known manner in aqueous solution until a compatibility with water of 0.5 to 10 and the condensate is reacted at a ph of 7.5 to 10 and between 45 and 100º c, in each case with 0.05 to 0.2 mol of a phenol, if necessary, with up to 0.5 mol of formaldehyde and, if necessary, with up to 0.5 mol of melamine, until the aqueous solution reaches a viscosity of 300 to 2000 cp, measured with a solids content of 63% and 20ºc. (Machine-translation by Google Translate, not legally binding)

    40.
    发明专利
    未知

    公开(公告)号：NO884401L

    公开(公告)日：1989-04-06

    申请号：NO884401

    申请日：1988-10-04

    Applicant: BASF AG

    Inventor： SCHMIDT-HELLERAU CHRISTOF ,  MAYER JOHANN

    IPC: B27N1/00 ,  C08L97/02 ,  B27N3/00

    Abstract: Wood materials with reduced subsequent release of formaldehyde can advantageously be produced by mixing lignocellulose-containing particles, for example wood chippings, with a curable binder based on curable aminoplastic condensates and subsequently pressing the mixture with heating, a mixture A containing a water-compatible agent for binding formaldehyde to the particles being applied or mixed with the particles before the particles are mixed with the curable binder, to give good resin reactivity, high strength and good swelling values if the mixture A is an aqueous solution having a pH of from 3.0 to 6.5 which contains a) organic acids which do not attack wood, or only do so to an insignificant extent, in an amount of greater than 15 % by weight, based on the solids content of the solution, preferably mixtures of aliphatic carboxylic acids having 4 to 10 carbon atoms, and b) a formaldehyde-binding, nitrogen-containing compound, in particular urea.

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