A sulfonated aromatic organic polymer, such as sulfonated polystyrene ion-exchange resin, is provided having N-alkylaminoorgano mercaptan groups attached to backbone sulfonyl radicals by covalent nitrogen-sulfur linkages. The ion-exchange resin can be used to effect phenol-ketone condensation in the synthesis of bisphenols.
The present invention relates to aqueous skin or hair cosmetic preparations which comprise at least one polymer A which comprises, in copolymerized form, at least one ester of (meth)acrylic acid, at least one olefinically unsaturated, free-radically polymerizable anionogenic or anionic compound, at least one free-radically polymerizable olefinically unsaturated urethane-group-containing compound which comprises no silicone groups and, if appropriate, further free-radically polymerizable compounds.
Two alternative methods for producing at least one N-substituted acyclic ethylene diamine are provided:
Method A according to the invention comprises:
- reacting at least one reducing sugar, hydrogen and at least one primary amine NH2R or at least one secondary amine NHR'R" or a mixture of at least one primary amine NH2R and at least one secondary amine NHR'R"
- in the presence of a supported hydrogenation catalyst
- at a reaction temperature of 50°C to 200 °C, and
- at a reaction pressure being superatmospheric pressure, and wherein
- the molar ratio of the at least one primary amine and/or secondary amine : reducing sugar is at least 4:1.
Method B according to the invention comprises the steps:
1. reacting at least one reducing sugar and at least one primary amine NH2R or at least one secondary amine NH2R'R" or a mixture of at least one primary amine NH2R and at least one secondary amine NHR'R" in a first step, and
2. reacting the reaction mixture obtained in step 1) with hydrogen in the presence of a supported hydrogenation catalyst in a second step.