22.
    发明专利
    未知

    公开(公告)号:DK554088D0

    公开(公告)日:1988-10-04

    申请号:DK554088

    申请日:1988-10-04

    Applicant: BASF AG

    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.

    28.
    发明专利
    未知

    公开(公告)号:GB1375502A

    公开(公告)日:1974-11-27

    申请号:GB946072

    申请日:1972-03-01

    Applicant: BASF AG

    Abstract: 1375502 Cascade polymerisation system BADISCHE ANILIN- & SODA-FABRIK AG 1 March 1972 [2 March 1971] 9460/72 Heading B1X [Also in Division C3] Apparatus comprising at least three, for example four or five cascade-connected stirred vessels are used in a continuous process for the manufacture of an amine-formaldehyde resin (see Division C3). In the Example the apparatus comprises a mixer, four reaction vessels, and a continuous evaporator.

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