摘要:
The invention relates to a skin protectant, particularly against hydrophobic (lipophilic) and hydrophilic (lipophobic) harmful substances, obtainable by means of an amount of at least one barrier-forming component, particularly against hydrophobic (lipophilic) harmful substances, wherein the nephelometric turbidity unit of the barrier-forming component is determined by means of turbidimetry and at least one barrier-forming component, a 1% solution in water thereof having a nephelometric turbidity unit of greater than 40 (NTU), is used to produce the protectant and a method for producing skin protectants, particularly against hydrophobic (lipophilic) and hydrophilic (lipophobic) harmful substances, where in the barrier-forming component is selected for production of the protectant such that the nephelometric turbidity unit of the barrier-forming component of the skin protectant is determined by means of turbidimetry and at least one barrier-forming component, a 1% solution in water thereof having a nephelometric turbidity unit of greater than 40 (NTU), is used to produce the skin protectant.
摘要:
The present invention relates to a process for the production of a superabsorbent polymer comprising preparing an aqueous mixture of monomers selected to provide after polymerization a superabsorbent polymer; feeding said monomer mixture to a reactor; subjecting the aqueous monomer mixture in the reactor to free-radical polymerization to obtain a superabsorbent polymer gel; removing the superabsorbent polymer from the reactor; and working-up the superabsorbent polymer removed from the reactor to obtain a final product, whereby a basic aqueous medium comprising carbonate and/or hydrogen carbonate is fed to the superabsorbent polymer gel.
摘要:
The present invention relates to process for the preparation of a superabsorbent polymer comprising the steps of a) subjecting an aqueous monomer mixture containing at least one α,β-ethylenically unsaturated monomer; at least one monomer bearing at least two α,β-ethylenically unsaturated groups; iron ions in an amount of 0.1 to 3 wppm based on the total weight of the aqueous monomer mixture; and at least one chelating agent in an amount to provide a mol ratio of chelating agent to iron ion of 0.8 to 4.0 to free radical polymerization in an reactor to obtain a super-absorbent polymer; and b) recovering the superabsorbent polymer, whereby if the process is continuous and is run in an agitated reactor the upper limit of the mol ratio of chelating agent to iron ion is 4.0 for a throughput of total reaction mixture through the reactor of at most 1.3 kg/h per liter reactor volume.
摘要翻译:本发明涉及制备超吸收性聚合物的方法,包括以下步骤:a)使含有至少一种α,β-烯属不饱和单体的含水单体混合物; 至少一种含有至少两个α,β-烯属不饱和基团的单体; 相对于含水单体混合物的总重量,铁离子的量为0.1〜3wppm; 和至少一种螯合剂,其量使得螯合剂与铁离子的摩尔比为0.8至4.0,以在反应器中进行自由基聚合以获得超吸收性聚合物; 并且b)回收超吸收性聚合物,由此如果该方法是连续的并且在搅拌反应器中运行,螯合剂与铁离子的摩尔比的上限为4.0,对于通过反应器的总反应混合物的通量为至多1.3 kg / h每升反应器体积。
摘要:
The invention relates to a superabsorbent polymer that includes a (meth)acrylic acid made by a process that comprises the following process steps: a) (meth)acrylic acid is crystallized out from a mother liquor; b) crystallized (meth)acrylic acid is separated from the mother liquor; c) at least part of the separated (meth)acrylic acid crystals are melted; d) the melted part is at least partially recycled to the step a) or step b). The superabsorbent polymer according to the present invention includes an process to make (meth)acrylic acid, the apparatus suitable for implementing the process, and the use of the apparatus for the production of (meth)acrylic acid characterized by a high purity of the thereby obtainable (meth)acrylic acid as well as by a high efficiency with regard to the achievable yield and necessary energy requirement, thereby providing an improved superabsorbent polymer.
摘要:
The invention relates to a superabsorbent polymer that includes a (meth)acrylic acid made by a process that comprises the following process steps: a) (meth)acrylic acid is crystallized out from a mother liquor; b) crystallized (meth)acrylic acid is separated from the mother liquor; c) at least part of the separated (meth)acrylic acid crystals are melted; d) the melted part is at least partially recycled to the step a) or step b). The superabsorbent polymer according to the present invention includes an process to make (meth)acrylic acid, the apparatus suitable for implementing the process, and the use of the apparatus for the production of (meth)acrylic acid characterized by a high purity of the thereby obtainable (meth)acrylic acid as well as by a high efficiency with regard to the achievable yield and necessary energy requirement, thereby providing an improved superabsorbent polymer.
摘要:
Among other things, a process for producing an agglomerated superabsorbent polymer particle and an agglomerated superabsorbent polymer particle are disclosed. The process comprises the steps of: (A) bringing superabsorbent polymer fine particles having at least about 40 wt. %, a particle size of less than about 150 μm into contact with a fluid comprising to more than about 10 wt. % a cross-linkable, uncrosslinked polymer based on polymerized, ethylenically unsaturated, acid group-bearing monomers or salts thereof; and (B) cross-linking the uncrosslinked polymer by heating the superabsorbent polymer fine particles and the fluid to a temperature from about 20 to about 300° C., so that the cross-linkable, uncrosslinked polymer at least partially crosslinks.
摘要:
A process for producing an absorbent polymer including a first mixing event, in which a plurality of absorbent polymer particles (1) are mixed with a liquid (2) and a second mixing event, in which the liquid (2) is homogenized within the interior of the polymer particles. The polymer particles (1) in the first mixing event are mixed with a speed such that the kinetic energy of the individual polymer particles (1) is on average larger than the adhesion energy of the individual polymer particles (1), and the polymer particles (1) in the second mixing event are stirred at a lower speed than in the first mixing event. The different speeds effect a fluidization of the polymer particles (1), which prevents a clumping of the polymer particles (1) during the mixing event. The absorbent polymers thus produced are distinguished by a particularly rapid swelling behavior.
摘要:
The present invention relates to processes for purifying a composition containing (meth)acrylic acid, at least one impurity and water, wherein the composition has a water content in the range of 0.55 to 90, based on the composition, to form a purified phase containing (meth)acrylic acid and at least one impurity, wherein, in the purified phase, the quantity of at least one impurity is less than 7% by weight, based on (meth)acrylic acid in the purified phase.
摘要:
The invention relates to a method of producing an abrasive substance, where natural kernels, shells, fruit skins and/or seeds are ground to give a flour of defined particle size, the flour is treated in aqueous suspension with at least one bleaching agent, in which the addition of the bleaching agent takes place in two steps, where, in the first step, at least 40% by weight to 90% by weight of the total amount of bleaching agent is added and the flour is sterilized in the acidic medium and, in the second step, the lightening and degreasing of the flour is brought about by the simultaneous metered addition of the remainder of the bleaching agent with an alkali solution in alkaline medium, and its use in cosmetic preparations.
摘要:
Flame proofing agents, especially useful for cellulosic materials. The agents are of the formula
WHEREIN, R1 and R2, which may be the same or different, each represents an alkyl, alkoxyalkyl or haloalkyl radical, R3 represents a mono- or multi-halogenated alkyl radical, and R4 represents a mono- or multi-halogenated alkyl radical, which may be the same as or different from that represented by R3, or an alkyl or alkenyl group.