Abstract: Aqueous coating solution having a pH of from 3 to 8, comprising 0.5-5.0% by weight of [SiOx(OH)y]n particles, where 0<y<4 and 0<x<2, having a particle size of from 10 nm to 60 nm with a tolerance of ±10%, and from 0.005 to 0.5% by weight, based on the coating solution, of a surfactant mixture obtainable by hydrolytic polycondensation of tetraalkoxysilanes in an aqueous-alcoholic-ammoniacal medium at temperatures between 35° C. and 80° C., with subsequent removal of ammonia and alcohol from the resultant dispersion by steam distillation and subsequent addition of a surfactant mixture comprising 15-30% by weight of anionic surfactants, 5-15% by weight of nonionic surfactants and less than 5% by weight of amphoteric surfactants.
Abstract: TN and HTN liquid-crystal displays having very short response times and good steepness values and angle dependencies, are obtained using nematic liquid-crystal mixtures which comprise compounds of formula IA in combination with compounds of the formula IC:
in which
R1 to R3, L1, Z,
and C are defined herein.
Abstract: The invention relates to a process for producing an accumulator composite comprising evacuating an impregnation vessel after partially or completely immersing a matrix in a phase change material in the impregnation vessel.
Abstract: The invention relates to the use of .alpha.-hydroxyketoalkyl derivatives as light protection filters for cosmetic or pharmaceutical products, the .alpha.-hydroxyketoalkyl group being linked, if appropriate via a spacer, to a chromophoric group which has an absorption maximum in a wavelength range of between 280 and 400 nm and has a conjugated .pi.-electron system of at least 8 .pi.-electrons, and to new .alpha.-hydroxyalkyl derivatives, processes for their preparation and pharmaceutical and cosmetic formulations comprising these derivatives as light protection substances.
Type:
Grant
Filed:
October 15, 1993
Date of Patent:
February 4, 1997
Assignee:
Merck Gmbh
Inventors:
Roland Martin, Ingeborg Stein, Ulrich Heywang, Michael Schwarz, Thekla Kurz