摘要:
The invention relates to a method of controlling the production of filler-containing paper. Filler and retention agent are both delivered to the paper manufacturing system in such a process of paper manufacture. The amount of filler in the paper is also measured, as is also the filler concentration or the total concentration in the white water or the stock. Filler is delivered in a quantity such that the system will be buffered with filler to a generally pre-determined concentration level (control value), which is followed via measuring processes. The continual addition of retention agent is based exclusively on the amount of filler in the paper measured at that moment in time, such that when the measured amount of filler present is lower than a desired level, the addition of retention agent is increased, while when the measured amount of filler present is higher than a desired level, the addition of retention agent is reduced and the continual addition of filler is based, at least seen in the long term, exclusively on the concentration level of filler measured in the white water or the stock, and so that when the measured level is lower than the control value, the addition of filler is increased, while when the measured level is higher than the control value, the amount of filler added is decreased.
摘要:
The present invention relates to novel peptide ligands for prostate specific antigen (PSA) binding specifically with it and enhancing its enzyme activity, to a process for preparation of these peptides, to diagnostic and pharmaceutical compositions comprising these peptides, to the use of these peptides for pharmaceutical and research preparations, to methods using these peptides in diagnostic assays for determination of the concentrations of various molecular forms of PSA, to methods for modulating the PSA enzyme activity and PSA activity dependent conditions by using these peptides either in vivo or in vitro and to the use of these peptides in procedures for biochemical isolation and purification of PSA.
摘要:
The present invention concerns a method for the preparation of norbornene and substituted norbornene compounds via a Diels-Alder reaction, in which method a cyclic diene is reacted with an olefinic compound in order to prepare a norbornene compound. According to the invention a cyclic diene is gradually added to react with an olefinic compound, in order to keep the concentration of the cyclic diene in the reaction mixture as low as possible during the reaction. It is possible to obtain a very pure product, high yield, short reaction time and high concentrations of the exo diastereomer with this procedure.
摘要:
The invention relates to a heterophasic composition which essentially consists of three immiscible components, A, B and C, and the production method of the same. The component A is some body compatible polymer, the component B is a water soluble or hydrolytically degradable substance which produces cavities or network like porosity after disappearing through solubilization or degradation, and a bioactive substance C which at least component B contains in form of particles as a blend component and which still exists in the pores or their walls after the degradation or solubilization of the component B. The materials according to the invention are biocompatible, solid in normal temperatures, mechanically processable, and thermally mouldable as well as bioactive in the sense that they have the capability to renew different kinds of tissues in the body, on the surface of the living organisms, in the cavities of the body and in the tissue engineering conditions outside the body, and that they can be used in tissue engineering, in tissue regeneration, in healing of damaged or lacking tissues, in tissue guiding when treating deficiencies, in controlled drug release, in the treatment methods of dentistry, in orthopedics and in plastic surgery.
摘要:
The present invention concerns pelletized propylene homo- or copolymer compositions having an ultra high melt flow rate (MFR) and a process for producing propylene homo- or copolymer fibres. According to the invention, the polymer composition has an MFR2 of 400 g/10 min or more and is obtainable by polymerising propylene at elevated pressure, optionally together with hydrogen and/or comonomers, in the presence of a catalyst in a reaction sequence including at least one bulk reaction zone.
摘要:
The invention concerns a process for preparing a tertiary alkyl ether product. The process comprises reacting the isoolefins of an olefinic hydrocarbon feedstock in a reaction zone (1 - 3) with an alkanol to form a reaction mixture, which is subjected to distillation in a first distillation zone (4). The bottoms product of the first distillation contains the ether(s), whereas the overhead stream contains unreacted alkanol and a mixture of light hydrocarbons. The overhead stream is subjected to a second distillation in a second distillation zone (15). The overhead product of the second distillation mainly contains the lightest hydrocarbons and a small amount of alkanol, and the bottoms product contains an essentially oxygenate-free hydrocarbon stream which can be used as such for alkylation. In order to increase the conversion of the process, a side drawoff is withdrawn from the second distillation zone (15) and recirculated to the reaction zone (1 - 3).
摘要:
A two-component curable paint composition comprises a base component containing at least one curable resin, and ahardening component which contains a non-conducting polyaniline, and a liquid-phase or molten-phase curing agent capable of curing said curable resin of the resin component and capable of dissolving non-conducting polyaniline. According to the invention, the curing agent comprises an organic aminecompound having at least two primary amine functions linked together by a hydrocarbon chain which is optionally interruptedby at least one heteroatom, said amine compound exhibiting irregularities in the chemical structure of its hydrocarbon chain.The invention also provides a method of preparing paint compositions, a method of forming a paint coating on the surface as well as a coated metal surface. The solutions produced by the invention are stable over extended periods of time, and the anti-corrosive effect of the paint compositions is good even at very low concentrations of the polyaniline.