摘要:
The present invention relates to a powdery, cross-linked polymer absorbing water and aqueous liquids formed of polymerized, unsaturated, acid groups-containing monomers that are present as salts neutralized to the extent of at least 50 mol-% and which optionally comprise further monomers which are copolymerizable with the acid groups-containing monomers as well as water-soluble polymers, the polymer being formed of acidic, polymerized monomers partially neutralized to the extent of 5-30 mol-%, relative to the acid groups-containing monomer portion. The polymer has a high retention, high liquid absorption under pressure, high swelling pressure, and a low content of soluble components. The present invention further relates to a process for the production of said polymer and to its use as a component in sanitary articles which absorb body fluids and in wound dressings, in current-conducting and light-transmitting cables, as soil conditioners, as a component in packaging materials and in depot materials for the controlled release of active substances.
摘要:
The invention relates to a process for producing water-soluble or water-swellable polymer products from acrylic acid and/or acrylic acid derivatives partially or completely neutralized with nitrogen compounds and with exceedingly low levels of residual monomers, which process is characterized by subsequent heating of the polymer product at temperatures of from 120 to 240° C. The polymers produced accordingly are suitable for use as flocculants, dispersants and absorbers.
摘要:
The invention relates to a process for the fat liquoring/softening of leathers and furs by treatment with an aqueous dispersion of a copolymer obtainable by polymerization of a) maleic anhydride, b) C.sub.12 -C.sub.30 alpha-olefins, esters of (meth)acrylic acid and/or maleic acid with C.sub.12 -C.sub.30 alcohols and c) optionally, further hydrophilic, ethylenically unsaturated monomers which are copolymerizable with a) and b), reaction of the anhydride groups with monovalent alcohols comprising at least one ether functionality, and partial neutralization or hydrolysis of the residual acid or anhydride groups and manufacture of a flowable dispersion having an active substance content of at least 40%-wt.
摘要:
The present invention relates to a process for the production of water-swellable products, using very fine particles of water-swellable polymers, characterized by the following steps: a) the very fine particles of water-swellable polymer are dispersed in a monomer which is liquid at room temperature and does not cause the polymeric superfines to swell, b) the dispersion obtained in step a) is mixed with an aqueous monomer solution, c) the mixture obtained in step b) is polymerized by the addition of catalysts and/or by exposure, and d) the polymer gel is comminuted and dried. The present invention further relates to a water-insoluble, water-swellable polymer which absorbs aqueous and serous liquids and blood, and is obtained by the process described above.
摘要:
The invention relates to a cross-linked, water-absorbent polymer obtainable by the polymerization of a mixture consisting of a) 60-99%-wt. unsaturated, polymerizable monomers with acid groups which are neutralized to the extent of at least 30 mol-%, b) 0-37%-wt. monomers copolymerizable with a), c) 0.1-3.0%-wt. of a cross-linking agent and d) 0-10%-wt. of a water-soluble polymer, in which polymerization is conducted with a redox catalyst system containing formamidine sulfinic acid as reducing agent. The polymer is distinguished by a retention of greater than or equal to 28 g 0.9% aqueous NaCl-solution per 1 g of polymer, an absorption of greater than or equal to 26 g 0.9% aqueous NaCl-solution per 1 g of polymer at a load of 20 g/cm.sup.2 and a residual monomer content of less than 700 ppm, and preferably less than 500 ppm. The invention also relates to the use of this polymer in the production of hygiene articles.
摘要:
The present invention relates to cross-linked polymers absorbing aqueous liquids, which are built up of partially neutralized, mono-ethylenically unsaturated, acid groups-containing monomers, optionally further monomers copolymerizable with these, as well as optional polymers suitable as a graft basis, and that can be produced by using cross-linking agents of polyunsaturated amino alcohols. The used cross-linking agents are reaction products of (meth)allylamines with monoglycidyl compounds, di-, tri- or tetraglycidyl compounds, and optional alkylene oxide; reaction products of (meth)allylamines or saturated primary amines with (meth)acrylglycide esters and/or (meth)allyl glycidyl ethers and optional alkylene oxide; as well as reaction products of di- and polyamides with (meth)allyl glycide esters and/or (meth)acrylglycide esters and optional alkylene oxide. The polymers according to the present invention provide superabsorbers whose property level meets the practice-oriented requirements with respect to retention, absorption under pressure, swelling pressure, and permeability for aqueous liquids. Such polymers are used as absorbents for water and aqueous liquids in constructions for the absorption or body fluids, in current-conducting and light-transmitting cables, and in the cultivation of plants.
摘要:
The present invention relates to alkoxy-groups-containing copolymers of a) 1 to 99%-wt. water soluble ethylenically unsaturated, acid-groups-containing monomers, b) 1 to 50%-wt. monomers having a polyalkoxy sequence and c) 0 to 60%-wt. water soluble monomers which are copolymerizable with a) and b); and to the use of said copolymers for retanning leathers previously tanned by a mineral or combined method. The leathers treated with the retanning agents according to the invention in particular stand out for an improved fullness and good grain tightness.The acid groups of monomers a) preferably are carboxyl groups.
摘要:
The present invention discloses the use of polymers which have built-in by polymerization 20 to 70%-wt. of a hydrophobic monomer selected from long-chain alpha-olefins, long-chain alkyl(meth)acrylates, vinyl esters of long-chain carboxylic acids, long-chain vinyl ethers, or mixtures of these monomers, 1 to 60%-wt. of a monomer with a specific polysiloxane group, and 20 to 35%-wt. water-soluble, unsaturated acids, unsaturated C.sub.4 -C.sub.6 dicarboxylic anhydrides, semi-esters or semi-amides of unsaturated C.sub.4 -C.sub.6 dicarboxylic acids, or mixtures of these monomers, in partially neutralized form as aqueous solution or dispersion, for softening, fat-liquoring and greasing, or hydrophobing leathers and furs.
摘要:
The invention concerns an absorbent for blood and serous body fluids consisting of at least two components, A and B, whereby component A is a crosslinked synthetic or natural polymer or copolymer, and component B is an organic and/or inorganic compound which is water-soluble and solid at normal temperature. The absorbent contains 25 to 98 weight % of component A and 2 to 75 weight % of component B. The invention, moveover, concerns the use of the said absorbent for absorption and/or retention of blood and serous body fluids, in particular in absorbent throwaway articles for surgical, medical and hygienic purposes.
摘要:
A process for the finish dressing of leathers dressed by a mineral or a combined method, by treatment with an aqueous solution of water soluble polymer dressing substances that are polymers of unsaturated monomers that contain sulfonic groups. These polymers contain, if necessary, additional basic units that do not affect the water solubility, these being derived from the comonomers that can be copolymerized with the monomers that contain the sulfonic groups and which do not contain phosphorus.