Ulrich Elisabeth Feldhues

6339117, Jan 15, 2002

Feb 28, 2000

09/463208

Udo Eckstein - Köln, DE
Siegfried Korte - Odenthal, DE
Ulrich Feldhues - Mount Pleasant SC
Hans-Peter Geiger - Rösrath, DE
Bernhard Hunke - Eitorf, DE
Thomas Roick - Leverkusen, DE
Günter Sackmann - Leverkusen, DE

Bayer Aktiengesellschaft - Leverkusen

C08K 534

524 86, 524 87, 524 89, 524 90, 524 91, 524 92, 524 94, 524820, 524827, 524828, 524831, 4273855, 4273899, 427391, 427393, 4273935, 4273936, 427394, 427395, 427396, 442130, 442154, 442155, 442164, 428512, 428513, 428514, 428522

The present invention relates to polymers whitened with optical brighteners obtained by (a) emulsion polymerization of acrylonitrile with or without a comonomer in the presence or absence of a graftable substrate, and (b) addition of an optical brightener before, during, or after the emulsion polymerization.

60254904, Feb 15, 2000

Feb 11, 1998

9/022337

Ulrich Feldhues - Charleston SC
Rolf Brockmann - Bergisch Gladbach, DE
Udo Eckstein - Koln, DE
Detlef Szeymies - Kurten, DE

Bayer Aktiengesellschaft - Leverkusen

C07D25168

5441932

A process for the preparation of compounds of the formula (I) ##STR1## wherein n represents 0-2; M represents H, alkali metal ion or optionally substituted ammonium ion; and X represents anilino, N- or N,N-alkylamino; by reaction of a compound of the formula (IV) ##STR2## with 2 molar equivalents of an amnine of the formula X--H, at a pH of 5-10, optionally in the presence of an acid-trapping agent which differs from X--H, wherein the compound of the formula (IV) is added to an aqueous reaction medium with a temperature of at least 40. degree. C. and the amine of the formula X--H and, optionally, the acid-trapping agent are added to the aqueous reaction medium independently of one another and/or during and/or after the addition of IV. The compounds of the formula I which are outstandingly suitable as optical brighteners.

62488872, Jun 19, 2001

May 21, 1998

9/077120

Ulrich Feldhues - Charleston SC
Uwe Vogt - Monheim, DE
Udo Eckstein - Koln, DE
Rolf Brockmann - Bergisch Gladbach, DE
Dietmar Fiedel - Bergisch Gladbach, DE

Bayer Aktiengesellschaft - Leverkusen

C07D25168

5441932

Process for the preparation of stilbene-disulphonic acids containing bis-alkoxy-triazinyl-amino, or derivatives thereof, characterized in that stilbene-disulphonic acids containing bis-chlorotriazinyl-amino, or derivatives thereof, are reacted with at least 10 molar equivalents, based on the stilbene-disulphonic acid compound, of a C. sub. 1 -C. sub. 4 -monoalkanol.

61214442, Sep 19, 2000

Jan 24, 1999

9/230108

Ulrich Feldhues - Mount Pleasant SC
Udo Eckstein - Koln, DE
Uwe Vogt - Monheim, DE
Rolf Brockmann - Bergisch Gladbach, DE

Bayer Aktiengesellschaft - Leverkusen

C07D25168

5441932

In the preparation of substituted 4,4'-diaminostilbene-2,2'-disulfonic acid salts a clear increase in the reaction rate may be achieved by carrying out the reaction of the tetrachlorine derivative (III) with the aniline (IV) in the presence of the amine (VI) as acid-absorber.