摘要:
A process for preparing a polymer in the form of an aqueous dispersion or a water-redispersible powder includes free-radically initiated heterophase polymerization of one or more ethylenically unsaturated monomers and optionally subsequent drying of the polymer dispersions obtained, wherein the polymerization is performed in a jet loop reactor.
摘要:
The invention provides paper coating slips comprising, as a binder, an aqueous dispersion of a styrene-butadiene copolymer or of a styrene-acrylic ester copolymer, or a mixture of these aqueous dispersions, characterized in that an aqueous dispersion of a polyvinyl alcohol-stabilized vinyl acetate-ethylene copolymer is additionally present in each case.
摘要:
Copolymers of ethylenically unsaturated monomers and ethylenically functionalized nanoparticles in the form of aqueous polymer dispersions or water-redispersible polymer powders, are obtained by aqueous free-radically polymerizing and optionally drying a copolymerizate of,A) one or more ethylenically unsaturated monomers in the presence of B) particles having an average diameter of ≦1000 nm, functionalized with ethylenically unsaturated, free-radically polymerizable groups, wherein B1) particles are metal oxides or semimetal oxides, and/or B2) particles are silicone resins and where B1) and B2) are functionalized with one or more α-organosilanes of the formula (R1O)3−n(R2)nSi—(CR32)—X (I), where X is a radical having 2 to 20 hydrocarbon atoms containing an ethylenically unsaturated group.
摘要翻译:通过水溶液自由基聚合和任选地干燥A)一种或多种烯键式不饱和单体的共聚物,在存在下共聚物的情况下获得烯键式不饱和单体和烯键式官能化纳米颗粒的聚合物分散体或水可再分散聚合物粉末形式的共聚物 B)具有平均直径<= 1000nm的颗粒,用烯属不饱和的可自由基聚合的基团官能化,其中B1)颗粒是金属氧化物或半金属氧化物,和/或B2)颗粒是有机硅树脂,其中B1)和B2 )用一种或多种下式的α-有机硅烷(R 1 O 3)3-n(R 2)n n进行官能化 X(I),其中X是含有烯属不饱和基团的具有2-20个烃基的基团。
摘要:
Crosslinkable silane-modified copolymers are prepared by copolymerizing free radically polymerizable monomers with an ethylenically unsaturated α-silane. The copolymers exhibit high storage stability coupled with rapid cure.
摘要:
A process for preparing polymer dispersions stabilized by polyvinyl alcohol includes a step of emulsion polymerization. The polymerization occurs such that at least 60% of the total conversion occurs at a temperature from 100° C. to 140° C.
摘要:
Water-redispersible polymer powder compositions based on a) homo- or copolymers of one or more monomers from the group consisting of vinyl esters of unbranched or branched C1-15 alkylcarboxylic acids methacrylic esters and acrylic esters of C1-15 alcohols, vinylaromatics, olefins, dienes, and vinyl halides, with one or more protective colloids, and optionally, one or more antiblocking agents, in conjunction with one or more alkali metal or alkaline earth metal C1-4 carboxylates as setting accelerants added follwoing polymerization accelerate the setting of construction chemistry products with hydraulically setting binders.
摘要翻译:基于以下的水可再分散性聚合物粉末组合物:a)一种或多种单体的均聚物或共聚物,所述单体来自由无支链或支链C 1-15烷基羧酸的甲基丙烯酸酯和C的丙烯酸酯组成的组 乙烯基芳烃,烯烃,二烯和卤乙烯与一种或多种保护胶体和任选的一种或多种防粘连剂结合一种或多种碱金属或碱土金属 C 1-4羧酸盐作为固化促进剂,加入聚合后加速了水硬性粘合剂的施工化学产品的凝固。
摘要:
A process for preparing polyvinyl-alcohol-stabilized polymers based on vinyl ester, ethylene, and optionally other comonomers, in the form of aqueous polymer dispersions or water-redispersible polymer powders, by means of free radical initiated continuous emulsion polymerization and optionally drying the resultant polymer dispersion, comprising carrying out the emulsion polymerization in minimally two pressurized reactors arranged in series at a temperature of from 40° C. to 100° C. and at a pressure of from 5 to 100 bar, to a residual monomer content less than 3% by weight, and continuing the polymerization in minimally one unpressurized reactor at a temperature of from 20° C. to 60° C. and at a pressure of less than 1.0 bar, wherein the polymerization is initiated using a redox system made from an oxidizing component and a reducing component, at least a portion of the reducing component introduced within the first pressurized reactor.
摘要:
The invention provides mixed aromatic vinyl-1,3-diene polymers stabilized by a protective colloid and present in the form of aqueous polymer dispersions or polymer powders redispersible in water as adhesives for porous substrates. The polymer dispersions and the polymer powders are obtained by emulsion polymerization of a mixture containing: a) 20 to 80 percent by weight of one or more vinylaromatics; b) 19.9 to 79.9 percent by weight of one or more 1,3-dienes; c) 0.1 to 15 percent by weight of one or more comonomers from the group consisting of N-methylolacrylamide, N-methylolmethacrylamide and the N-(alkoxymethyl)-acrylamides and N-(alkoxymethyl)-methacrylamides with a C1 to C6-alkyl radical. The sum of the above percentages adds up to 100% by weight. Emulsion polymerization is carried out in the presence of one or more protective colloids and without emulsifiers, optionally followed by drying of the resulting aqueous polymer dispersion.
摘要:
The invention relates to a process for the preparation of polymers stabilized with protective colloids in the form of water-redispersible powders or aqueous dispersions thereof having a reduced content of volatile components, by a) polymerizing by emulsion or suspension polymerization, one or more monomers from the group consisting of vinyl esters, (meth)acrylates, vinyl aromatics, olefins, 1,3-dienes and vinyl halides and optionally further monomers copolymerizable therewith, b) aftertreating the polymer dispersion thus obtained by means of postpolymerization, distillation, and/or introduction of steam or inert gas to obtain a residual content of volatile, nonaqueous components of 120° C., and optimally d) redispersing of the resulting powder in water.
摘要:
A method for producing protective-colloid-stabilized polymers in the form of their aqueous polymer dispersions or in the form of powders which can be re-dispersed in water, wherein one or several monomers from the group made up of vinyl aromatics, 1.3 dienes, acrylic acid esters and methacrylic acid esters of alcohols with 1 to 15 C-atoms are polymerized in the presence of a combination of protective colloids consisting of one or several protective colloids from the group of hydrophobically modified, partly saponified polyvinyl esters which produce a surface tension of ≦40 mN/m as a 2% aqueous solution, and one or several protective colloids which produce a surface tension of >40 mN/m as a 2% aqueous solution.