Abstract: A method is described for producing saturated dicarboxylic acids with a chain length of C6 to C21 or the corresponding diamidic dicarboxylic acids from fatty acid cleavage of unsaturated fatty acids or the bis-fatty acid diamides of these unsaturated fatty acids by oxidative ozonolysis and subsequent separation and purification of the dicarboxylic acids, whereby after oxidative ozonolysis, the reaction products are dissolved at a high temperature in a carboxylic acid or a mixture of several carboxylic acids with a medium chain length of C6 to C12 or esters of short-chain alcohols of these carboxylic acids as the recrystallization solvent.

Abstract: A method is described for producing saturated dicarboxylic acids with a chain length of C6 to C21 or the corresponding diamidic dicarboxylic acids from fatty acid cleavage of unsaturated fatty acids or the bis-fatty acid diamides of these unsaturated fatty acids by oxidative ozonolysis and subsequent separation and purification of the dicarboxylic acids, whereby after oxidative ozonolysis, the reaction products are dissolved at a high temperature in a carboxylic acid or a mixture of several carboxylic acids with a medium chain length of C6 to C12 or esters of short-chain alcohols of these carboxylic acids as the recrystallization solvent.

Abstract: A method is described for producing saturated dicarboxylic acids with a chain length of C6 to C21 or the corresponding diamidic dicarboxylic acids from fatty acid cleavage of unsaturated fatty acids or the bis-fatty acid diamides of these unsaturated fatty acids by oxidative ozonolysis and subsequent separation and purification of the dicarboxylic acids, whereby after oxidative ozonolysis, the reaction products are dissolved at a high temperature in a carboxylic acid or a mixture of several carboxylic acids with a medium chain length of C6 to C12 or esters of short-chain alcohols of these carboxylic acids as the recrystallization solvent.

Abstract: A process for producing a triglyceride mix free from components hampering further processing from a vegetable oil as a starting material, which is cooled and then separated into a predominantly solid and a predominantly liquid phase. The vegetable oil used as starting material is one in which a predetermined reactive fatty acid predominates in the fatty acid pattern with a content of at least about 80%. The cooling temperature of the cooling step is so adjusted that the particularly hard to solidify or readily soluble triglycerides in the starting material remain at least substantially liquid or in solution. In one embodiment, the solid phase obtained after the first separation step is then dissolved and cooled in a second cooling step to a temperature different from an initial temperature step at which the easier to solidify or less soluble triglycerides bearing less reactive groups separate out.

Abstract: The present invention relates to a process of producing symmetrically structured difatty acid diamines by reacting mixtures of fatty acids or their esters with diamines, isolating the symmetrical difatty acid diamides from the reaction mixture by making use of their different solubilities and concentrating them by recrystallisation if necessary. The invention also provides for a process of isolating a fatty acid from a mixture of fatty acids wherein the difatty acid diamides produced in the process of the invention are saponified to yield the corresponding free fatty acid.

Abstract: The present invention relates to plastics that can be obtained by reacting unsaturated and/or hydroxyl-group-containing fatty acids or their esters or mixtures of various such fatty acids and esters with bifunctional ester-forming and/or amide-forming compounds and, if necessary, subsequently converting ethylenic double bonds, to give difatty acid diamides, difatty acid diesters, difatty acid amide esters, monofatty acid amide amines or monofatty acid amide alcohols as monomer components which contain at least two reactive groups suited for linkage to give polymers, in particular ethylenic double bonds, hydroxyl groups, epoxy groups or amino groups, and by linking the said compounds in the known way via a second group of bifunctional compounds that are capable of reacting with these free reactive groups to give the desired plastics.

Abstract: The invention relates to a hydrogel which is a copolymer of a polymerizable monomer mixture which containsa) 2-85 mol-% of a hydrophobic vinyl monomer with at least three fluorine atoms,b) 2-80 mol-% of a hydrophobic polyhydroxy vinyl monomer whose hydroxyl groups are in protected form,c) 2-70 mol-% of a hydrophilic vinyl monomer and,d) based on the total amount of monomers a)-c), 0-5 mol-% of a crosslinker, in which hydrogel the hydroxyl groups of the segments formed by the monomers b) are in protected or in free form.These hydrogels can be used, for example, as contact lenses, intraocular lenses or in other areas of application where biologically tolerated materials are required.

Abstract: The invention relates to a hydrogel which is a copolymer of a polymerizable monomer mixture which containsa) 2-85 mol-% of a hydrophobic vinyl monomer with at least three fluorine atoms,b) 2-80 mol-% of a hydrophobic polyhydroxy vinyl monomer whose hydroxyl groups are in protected form,c) 2-70 mol-% of a hydrophilic vinyl monomer and,d) based on the total amount of monomers a)-c), 0-5 mol-% of a crosslinker, in which hydrogel the hydroxyl groups of the segments formed by the monomers b) are in protected or in free form.These hydrogels can be used, for example, as contact lenses, intraocular lenses or in other areas of application where biologically tolerated materials are required.