摘要:
Benzene derivatives of the general formula ##STR1## where Hal is halogen, R.sup.1 is a hydrocarbon radical of 1 to 18 carbon atoms, R.sup.2 is hydrogen or alkyl of 1 to 6 carbon atoms and X is hydrogen or halogen, are prepared by a process in which a toluene derivative of the general formula ##STR2## is electrochemically oxidized in the presence of an acid of the formula R.sup.2 --COOH (III). Novel benzene derivatives of the general formula ##STR3## where R.sup.3 is hydrogen or an R.sup.2 --CO-- radical but R.sup.1 cannot be methyl if X is hydrogen, and of the general formula ##STR4## where R.sup.4 is a branched or cyclic alkyl radical of 3 to 12 carbon atoms, but R.sup.4 cannot be isopropyl if X is hydrogen. The compounds of formulas IV and VI are intermediates for crop protecting agents, e.g. pyrethroids.
摘要:
A process for the preparation of benzaldehyde dialkyl acetals of the general formula ##STR1## where R.sup.1 is alkyl of 1 to 6 carbon atoms, R.sup.2, R.sup.3 and R.sup.4 are hydrogen or halogen, straight-chain, branched or cyclic hydrocarbon radicals or alkoxy, acyloxy, aryloxy or aralkoxy, and n is 1 or 2, in which benzyl derivatives of the general formula ##STR2## where R.sup.2, R.sup.3, R.sup.4 and n have the abovementioned meanings, R.sup.5 is hydrogen or R.sup.6 --CO--, and R.sup.6 is hydrogen or alkyl of 1 to 6 carbon atoms, are anodically oxidized in the presence of an alcohol of the formula R.sup.1 --OH where R.sup.1 has the abovementioned meaning.
摘要:
A process for preparing 4-dialkoxymethylpyrazoles of the formula I ##STR1## where R.sup.1 is n-alkyl,R.sup.2 is a hydrocarbon radical,R.sup.3 and R.sup.4 are each hydrogen, a hydrocarbon radical, cyano, halogen or alkoxycarbonyl,entails electrochemical oxidation of a 4-methylpyrazole of the formula II ##STR2## in the presence of an alkanol R.sup.1 --OH.
摘要:
A mixture of superabsorbents having differing surface postcrosslinking, more particularly a mixture of differingly surface-postcrosslinked sieve cuts of a base polymer, exhibits improved absorption and retention over a unitarily surface-postcrosslinked superabsorbent.
摘要:
The present invention relates to a water-absorbing material obtainable by a process comprising the steps of A) treating a particulate, non-surface-crosslinked, water-absorbing polymer with a mixture comprising an aqueous solvent and at least one salt of a transition metal and B) irradiating the polymer treated according to A) with UV radiation, to a process for its production and to articles comprising the water-absorbing material.
摘要:
The invention concerns a process for producing water-absorbing polymer, which comprises a base polymer A being mixed with a first aqueous solution B of at least one surface postcrosslinker and a second aqueous solution C of at least one polyvalent cation and thermally treated, wherein said base polymer A is based on at least 50% neutralized acid-functional monomer and said solutions B and C are metered wholly or partly concurrently through separate nozzles whereby a water-absorbing polymer having a high saline flow conductivity value is obtained.
摘要:
The invention relates to finely divided water-absorbing polymeric particles having high fluid transportation and absorption performance, the Centrifuge Retention Capacity (CRC) being not less than 26 g/g, the absorbency under a load of 4.83 kPa (AUL0.7 psi) not less than 23 g/g and the Transportation Value (TV) not less than 15,000 cm3s, the Transportation Value (TV) being the product of Saline Flow Conductivity (SFC) and wicking absorption after 60 minutes (DA60) multiplied by 107, and wherein the wicking absorption after 60 minutes (DA60) is the weight of 0.9% by weight sodium chloride solution absorbed by 70 g of the water-absorbing polymeric particles in 60 minutes, wherein the water-absorbing polymeric particles are situated, during measurement, in a circularly round vessel which has an internal diameter of 6 cm and is sealed at its lower end by a sieve base of 36 μm mesh size, and the sieve base is in atmospheric contact with 0.9% by weight sodium chloride solution, processes for their preparation and also their use in hygiene articles and packaging materials.
摘要:
Swellable hydrogel-forming polymer comprising at least one hydrophilic polymer of dendritic structure, a process for preparing the swellable hydrogel-forming polymer and also its use in hygiene articles.
摘要:
The invention refers to absorbent structures for use in an absorbent article, the absorbent structure comprising a water absorbing material. The water absorbing material is obtainable by a process comprising the steps of bringing particles of a non surface-crosslinked water-absorbing polymer in contact with at least one post-crosslinker, at least one water-insoluble metal phosphate, and at least one further ingredient. The at least one ingredient is selected from at least one Nitrogen-containing water-soluble polymer, and at least one hydrophobic polymer. The particles are heat-treated at a temperature in the range from 120° C. to 300° C.
摘要:
The invention refers to absorbent structures for use in an absorbent article, the absorbent structure comprising a water absorbing material. The water absorbing material is obtainable by a process comprising the steps of bringing particles of a non surface-crosslinked water-absorbing polymer in contact with at least one postcrosslinker, at least one Nitrogen-containing water-soluble polymer, and at least one hydrophobic polymer. The particles are heat-treated at a temperature in the range from 120° C. to 300° C.