摘要:
New copolymers soluble in water and aqueous acids are disclosed comprising in a statistical distribution in the macromolecule at least 5% by weight of entities containing a formylamino functionality and at least 10% by weight of entities containing an amino carbonyl functionality, which are stable in high concentrations of Bronsted-Lowery acids and can be used as friction reducers in the stimulation of oil or gas wells.
摘要:
A process for producing water-absorbing polymer particles by polymerizing an aqueous monomer solution in a kneader having at least two shafts in axially parallel rotation, wherein the reaction mixture is transported in axial direction and the region at the start of the kneader is trace-heated.
摘要:
A computer-based system configured to calculate an estimated risk premium for reinsurance of a cedent's insurance policies covering loss event related fatalities and disabilities. The system stores, for different market scenarios, representative of loss events for a defined insurance market, frequency of loss event and number of insured individuals involved in the loss event. Based on these market scenarios and considering the cedent's market share, the system calculates individual scenarios, indicative of the cedent's exposure to the loss events. Using a standard distribution for the number of insured individuals involved in the loss event, for example a Pareto distribution, and using individual scenarios as interpolation points, the system calculates a set of loss event frequencies by number of individuals insured by the cedent and involved in a loss event. Finally, the system calculates the estimated risk premium from the set of loss event frequencies and from severity data.
摘要:
The present invention relates to absorbents for water and aqueous solutions, in particular for blood, which contain a product from the tuber of a plant from the family of the Araceae.
摘要:
The present invention relates to hydrophilic, swellable graft polymers which comprise, in a random distribution, from 0.5 to 50% by weight of radicals of the general formula I ##STR1## and radicals of the general formula II ##STR2## from 49 to 99% by weight of radicals of the general formula III ##STR3## containing an acid group, and from 0.1 to 2% by weight of radicals of a crosslinking agent which are derived from monomers containing at least two olefinically unsaturated double bonds, where the radicals R.sup.1 to R.sup.4, X and Y and n and m are where X and Y, independently of one another are COCH.sub.3, CH.sub.2 COOR.sup.2, COCH.sub.2 CH.sub.2 COOH ##STR4## n and m, independently of one another, are 2 to 300, R.sup.1 is hydrogen or methyl, R.sup.2, independently of one another, are hydrogen, methyl or ethyl, R.sup.3 is the carboxyl group, the sulphonyl group, the phosphonyl group, which is optionally esterified by means of alkanol having 1 to 4 carbon atoms, or a group of the formula ##STR5## to the preparation thereof, and to the use thereof as absorbents for water and aqueous solutions.
摘要:
The present invention relates to the use of compounds of the general formula I ##STR1## in which R denotes alkyl, alkenyl or aryl, which can be optionally substituted, as crosslinkers in the preparation of hydrogels, and to the hydrogels thus prepared and their use.
摘要:
Hydrophobic, cross-linked absorbent polymers, insoluble in water, in the form of microbeads , based on silica and acrylic acid partially salified by an alkali metal, are obtained by a polymerization process in a water-in-oil suspension in which an aqueous phase obtained extemporaneously from (1), an aqueous solution containing one or more hydrosoluble polymerization initiators, which are free radical generators, and (2), an aqueous phase containing at a concentration of 50.+-.15% by weight a mixture of by weight 2 to 25% of colloidal silica and 98 to 75% of acrylic acid of which 60 to 80 is salified by an alkaline metal, is introduced slowly, under agitation, into a totally deoxygenated oil phase maintained at boiling point and containing a protective colloid, with an aqueous phase to oil phase weight ratio of between 0.8 and 1.2, then when the polymerization reaction is finished, 15 to 55% of the water present is eliminated by azeotropic distillation with recycling of the organic solvent, then 0.01 to 0.06% in molar proportions relative to the monomers of ethyleneglycol diglycidyl ether is introduced into the reaction mixture at boiling point and azeotropic distillation of the residual water is continued until a suspension is obtained which has a dry content of 85.+-.10% and finally the desired polymer is isolated by filtration; use as absorbent compound and in a sanitary article.
摘要:
A computer-based system configured to calculate an estimated risk premium for reinsurance of a cedent's insurance policies covering loss event related fatalities and disabilities. The system stores, for different market scenarios, representative of loss events for a defined insurance market, frequency of loss event and number of insured individuals involved in the loss event. Based on these market scenarios and considering the cedent's market share, the system calculates individual scenarios, indicative of the cedent's exposure to the loss events. Using a standard distribution for the number of insured individuals involved in the loss event, for example a Pareto distribution, and using individual scenarios as interpolation points, the system calculates a set of loss event frequencies by number of individuals insured by the cedent and involved in a loss event. Finally, the system calculates the estimated risk premium from the set of loss event frequencies and from severity data.
摘要:
A process for producing water-absorbing polymer particles by polymerizing an aqueous monomer solution in a kneader having at least two shafts in axially parallel rotation, wherein the reaction mixture is transported in axial direction and the region at the start of the kneader is trace-heated.
摘要:
Hydrogel-forming polymers which have: (i) a Saline Flow Conductivity of at least 40×10−7 cm3s/g; (ii) an AUL 0.7 psi (4826.5 Pa) of at least 20 g/g; and (iii) a Frangibility Index of at least 60%, are useful in hygienic articles such as incontinence briefs for adults and diapers for infants.
摘要翻译:具有以下特征的水凝胶形成聚合物:(i)至少40×10 -7 cm 3 / g的盐水流动电导率;(ii)至少20g / g的AUL 0.7psi(4826.5Pa); 和(iii)至少60%的易碎指数,可用于卫生用品,如成人尿失禁者和婴儿尿布。