摘要:
Redispersible core/shell elastomeric particles are prepared by a process wherein a silicone elastomer core is covered with a second silicone shell, followed by an organic polymer shell.
摘要:
Mono-hydroxyl-functional organopolysiloxanes are prepared with minimal byproducts and increased storage stability by reaction of cyclotrisiloxanes with sil(ox)anols containing less than 1 weight percent water in the presence of heterogenous alkali metal or alkaline earth metal oxide or carbonate catalysts.
摘要:
Silanes of the formula Ra1R4-a-xSiLx (I) where each R is identical or different and is a monovalent, optionally substituted hydrocarbon radical which is free of aliphatic carbon—carbon multiple bonds and has from 1 to 18 carbon atoms per radical, R1 is an optionally substituted 2-norbornyl radical, L is a leaving group, a is 1, 2 or 3 and x is 1 or 2, with the proviso that the sum of a+x≦4, are useful for protecting functional groups of organic compounds (2) which have at least one functional group having an active hydrogen atom, preferably as a hydroxyl group —OH, a thiol groups —SH, an amine group —NH— or —NH2, a carboxyl group —COOH, or an amide group —CONH— or —CONH2.
摘要:
A process for reducing free aldehydes in dispersions, suspensions, emulsions and solutions which comprises including therein thioamine compound of the formula IV and optionally a thioamine of the formula III: where R1 is a C1-5 alkyl radical, an aryl radical or hydrogen, R2 is —(COO)a —E or —(CONH)a—E where a is 0 or 1 and E, R3, R4, and R5 are independently R4 and R5 together containing at least one carbon atom, and n being 0 or 1.
摘要:
The invention relates to a method and a device for monitoring the insulation of an ungrounded DC and/or AC voltage network. The method includes the following steps: (a) generating a measurement DC voltage Umess= that is connected to a ground on one side for a tvar; predeterminable measuring time frame tvar; (b) generating and superposing at least one measurement AC voltage Umess˜ connected to a ground and having a measurement duration tcons with the measurement DC voltage Umess− for forming a total measurement voltage Umess; (c) feeding the total measurement voltage Umess into the voltage network to be monitored; and (d) determining an insulating resistance R= from the measurement DC voltage Umess− and an insulating impedance Z from the measurement AC voltage Umess˜. The devise is configured to carry out the above method. The method and the device are suited in particular for monitoring the insulation in electric and hybrid vehicles.
摘要:
Polyester/polysiloxane copolymers are prepared by ring-opening synthesis of hydroxyalkyl- or aminoalkyl functional organopolysiloxanes from a cyclic silazane and an Si—OH functional polysiloxane, followed by reaction with a cyclic lactone such as a caprolactone. The process tolerates functional groups on the polysiloxane segments which are not possible in other synthetic methods.
摘要:
Aminoalkyl-functional siloxanes are prepared efficiently by a continuous process in which a cyclic silazane and a hydroxyl-functional siloxane are fed continuously to a reaction zone, reacted in the reaction zone, and the aminoalkyl product and any unreacted starting materials are removed from the reaction zone. The process is effective even with hydroxyl-functional siloxanes having a very low weight percentage of hydroxyl groups.
摘要:
The invention relates to a process for preparing organopolysiloxane/polyurea/polyurethane block copolymers, and also to the use of the organopolysiloxane/polyurea/polyurethane block copolymers prepared by means of the process.
摘要:
A method for the diagnostic detection of diseases associated with protein depositions (pathological protein depositions) by measuring an association of substructures of the pathological protein depositions, structures forming pathological protein depositions, structures corresponding to pathological protein depositions and/or pathological protein depositions as a probe; to substructures of the pathological protein depositions structures forming pathological protein depositions, structures corresponding to pathological protein deposition and/or pathological protein depositions as targets; characterized in that the target is detected in liquid phase wherein, in the case of detecting Alzheimer's disease, the liquid phase is obtained from body fluids or is itself a body fluid; with the proviso that the association of the probe to the target is measured before self-aggregation of the probe predominates.