公开(公告)号：DE3733630A1

公开(公告)日：1989-04-13

申请号：DE3733630

申请日：1987-10-05

Applicant: BASF AG

Inventor： SCHMIDT-HELLERAU CHRISTOF ,  MAYER JOHANN DR

IPC: B27N1/00 ,  C08L97/02

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.

公开(公告)号：DE2243857A1

公开(公告)日：1974-04-04

申请号：DE2243857

申请日：1972-09-07

Applicant: BASF AG

Inventor： ERHARDT KLAUS DR ,  PETERSEN HARRO DR ,  TEUTHER WOLFGANG DR ,  WITTMANN OTTO ,  BRUNNMUELLER FRITZ DR ,  GRABOWSKY OTTO DR ,  MAYER JOHANN DR ,  LENZ JOHANN

IPC: C08G12/12 ,  C08G9/10

Abstract: A urea-formaldehyde resin is formed by (a) reacting formaldehyde and urea of an initial molar ratio of >=3, in an aqs. soln., pH 3, until 1% of the urea has reacted to form urone gps., or by reacting as above during a time t = 10pH-2 (between 90-100 degrees C), (b) adding urea to the obtd. prod., at pH=3, such that the polar ratio HCHO:urea is 2-2.75 and condensing until the aqs. soln. of the condensate is no longer indefinitely dilutable in water at room temp., and (c) concentrating or evaporating the soln. formed to give a prod. contg. HCHO and urea in a molar ratio 1-2.75. The resin is used partic. in the mfr. of plywood and has a reduced tendency to evolve free HCHO.

公开(公告)号：GR71009B

公开(公告)日：1983-03-31

申请号：GR800163375

申请日：1980-11-15

Applicant: BASF AG

Inventor： SCHATZ HERMANN ,  DUDECK CHRISTIAN DR ,  DIEM HANS ,  MAYER JOHANN DR ,  SCHMIDT-HELLERAV CHRISTOF

IPC: C08G14/10 ,  C08L61/34 ,  C09J161/34

公开(公告)号：DE2860778D1

公开(公告)日：1981-09-24

申请号：DE2860778

申请日：1978-09-04

Applicant: BASF AG

Inventor： GRASER MARTIN ,  HANN ERNST WILHELM ,  HENKEL HELMUT ,  MAYER JOHANN DR ,  SCHMIDT-HELLERAU CHRISTOF

IPC: B27N1/00 ,  C08L25/08 ,  C08L33/08 ,  C08L33/10 ,  C08L61/20 ,  C08L91/08 ,  C08L97/02 ,  B29J5/02

公开(公告)号：DE2745809A1

公开(公告)日：1979-04-26

申请号：DE2745809

申请日：1977-10-12

Applicant: BASF AG

Inventor： LEHMANN GERHARD DR ,  MAYER JOHANN DR ,  SCHMIDT-HELLERRAU CHRISTOF

IPC: C08G12/12 ,  C08G12/40 ,  C09J161/24 ,  C08L61/24 ,  C09J3/16

Abstract: A urea-HCHO resin soln. with a molar ratio of HCHO urea of is not 1.2:1 and a viscosity of 500-1500 mPas at 65% solids and 20 degrees C, is brought to a pH of is not 7.5, and a temp. of is not 40 degrees C, and mixed with stirring, with sulphite waste liquor, the amt. of the liquor is 1-6 wt % solids w.r.t. the resin soln. The soln. is a wood glue. It has improved pre-bonding strength, and the pre-glued wood parts can be transported without sepg.

公开(公告)号：CH598294A5

公开(公告)日：1978-04-28

申请号：CH916174

申请日：1974-07-04

Applicant: BASF AG

Inventor： EISELE WOLFGANG DR ,  PETERSEN HARRO DR ,  MAYER JOHANN DR ,  WITTMANN OTTO

IPC: C08G12/00 ,  B27N3/02 ,  C08G12/12 ,  C09J161/20 ,  C09J161/24 ,  C09J3/16

Abstract: Condensates containing urea and formaldehyde in a molar ratio of from 1:2.5 to 1:4.5 are converted into wood glue by allowing the viscosity to increase at a pH of from 1 to 3 and at only slightly elevated temperature and then adding urea at a pH of 7 to 9.

公开(公告)号：DE2241995A1

公开(公告)日：1974-04-04

申请号：DE2241995

申请日：1972-08-26

Applicant: BASF AG

Inventor： BRUNNMUELLER FRITZ DR ,  SCHATZ HERMANN ,  MAYER JOHANN DR ,  GRABOWSKY OTTO DR

IPC: C08G12/02 ,  C08G9/30

Abstract: In parent patent, aminoplast solns. for use as adhesives were prepd. continuously by condensing cpds. capable of forming aminoplants and HCHO in the presence of a catalytic mixt. consisting of ammonia or an amine, and an acid or acid salt, in homogeneous aq. soln. at boiling temp. in >=3 successive reactors. Here, the molar ratio of HCHO to aminoplast precursor in the second reactor and the following reactors is maintained at 1.6-2.6:1, the pH being 4.0-6.0, pref. 5.0-6.0. Lower residence time is needed for a given degree of condensation. Less corrosion of the metallic surfaces of the appts. is caused and the aminoplast solns. have better storage stability.

公开(公告)号：AT81050T

公开(公告)日：1992-10-15

申请号：AT88105373

申请日：1988-04-02

Applicant: BASF AG

Inventor： NEUMANN CLAUS DR ,  MAYER JOHANN DR ,  KARAU DIETER ,  NEUNER SEPP

IPC: B05C5/00 ,  B27G11/00

公开(公告)号：DE3712347A1

公开(公告)日：1988-10-20

申请号：DE3712347

申请日：1987-04-11

Applicant: BASF AG

Inventor： NEUMANN CLAUS DR ,  MAYER JOHANN DR ,  KARAU DIETER ,  NEUNER SEPP

IPC: B05C5/00 ,  B27G11/00

公开(公告)号：DE3466553D1

公开(公告)日：1987-11-05

申请号：DE3466553

申请日：1984-12-17

Applicant: BASF AG

Inventor： MAYER JOHANN DR ,  SCHMIDT-HELLERAU CHRISTOF

IPC: C08K5/09 ,  C08K5/098 ,  C08L61/20 ,  C09J3/16