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公开(公告)号：DE2435793A1
公开(公告)日：1976-02-05
申请号：DE2435793
申请日：1974-07-25
Applicant: BASF AG
Inventor： GRABOWSKY OTTO DR , WITTMANN OTTO ING GRAD , DUERMEYER DIETER
IPC: C08G12/12 , C09J161/24 , C08L61/24 , C08K5/07
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公开(公告)号：DE2207921A1
公开(公告)日：1972-08-30
申请号：DE2207921
申请日：1972-02-19
Applicant: BASF AG
Inventor： ERHARDT KLAUS DR , PETERSEN HARRO DR , REUTHER WOLFGANG , WITTMANN OTTO , BRUNNMUELLER FRITZ DR , GRABOWSKY OTTO DR , MAYER JOHANN DR , LENZ JOHANN
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.
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公开(公告)号：CH506462A
公开(公告)日：1971-04-30
申请号：CH1620468
申请日：1968-10-31
Applicant: BASF AG
Inventor： DUEMBGEN GERD DR , GRABOWSKY OTTO DR , HAAS HANS DR , SPERBER HEINRICH DR , WOERNER ALFRED DR , JOSEF ZIPFEL
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公开(公告)号：DE920965C
公开(公告)日：1954-12-06
申请号：DEB0021490
申请日：1952-08-06
Applicant: BASF AG
Inventor： WOERNER ALFRED DR , GRABOWSKY OTTO DR , SCHEUERMANN HANS DR , TRIMBORN WERNER DR , VLACHOS ACHILLES DR
IPC: C07D487/04
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公开(公告)号：DE2334981A1
公开(公告)日：1975-01-30
申请号：DE2334981
申请日：1973-07-10
Applicant: BASF AG
Inventor： GRABOWSKY OTTO DR , WOLF DIETER DIPL-ING DR , DIEM HANS DIPL-CHEM DR , MATTHIAS GUENTHER DIPL-CHEM DR
IPC: C07C45/00 , C07C45/38 , C07C47/055 , C07C67/00 , C07C47/04
Abstract: Manufacture of formaldehyde by oxidative dehydrogenation of methanol in the presence of a silver catalyst using methanol obtained from a condensate derived from the evaporation of aqueous reaction mixtures in the synthesis of urea resins and then treated with caustic soda solution under specific conditions of temperature, pressure, residence time and initial formaldehyde concentration. The formaldehyde obtained is a disinfectant, tanning agent, reducing agent and starting material for the manufacture of synthetic resins, adhesives and plastics.
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Patent Agency Ranking
公开(公告)号：DE2163061A1
公开(公告)日：1973-06-20
申请号：DE2163061
申请日：1971-12-18
Applicant: BASF AG
Inventor： GRABOWSKY OTTO DR , BRUNNMUELLER FRIEDRICH DR , MAYER JOHANN DR , SCHATZ HERMANN
IPC: C08G12/12 , C09J161/24 , C09J3/16
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公开(公告)号：DE1643705A1
公开(公告)日：1971-06-03
申请号：DEB0095673
申请日：1967-12-02
Applicant: BASF AG
Inventor： WOERNER ALFRED DR , DUEMBGEN GERD DR , SPERBER HEINRICH DR , HAAS HANS DR , GRABOWSKY OTTO DR
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公开(公告)号：CH620461A5
公开(公告)日：1980-11-28
申请号：CH52376
申请日：1976-01-16
Applicant: BASF AG
Inventor： GRABOWSKY OTTO DR , LENZ JOHANN
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公开(公告)号：DE2502168A1
公开(公告)日：1976-07-22
申请号：DE2502168
申请日：1975-01-21
Applicant: BASF AG
Inventor： GRABOWSKY OTTO DR , LENZ JOHANN
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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
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.
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