摘要:
The present invention provides a process for preparing a metal-free alkaline earth methanolate by alcoholysis of an alkaline earth ethanolate with methanol.
摘要:
An oligomer mixture of n-propylethoxysiloxanes, containing from 80 to 100% by weight of n-propylethoxysiloxanes having a degree of oligomerization ranging from 2 to 6.
摘要:
A composition comprising at least one organofluorine-functional silane and/or siloxane, at least one mineral acid and at least one metal salt of aluminum(III), tin(II), tin(IV), iron(III) or titanium(III); a process for preparing said composition and to its use; and surface-modified substrates obtainable by coating with said composition.
摘要:
Fluoroalkyl organosilicon compounds are prepared by reacting fluoroolefins with organosilicon compounds that contain at least one H-Si group, in the presence of a Pt(0) complex catalyst. Further, fluoroalkylalkoxy organosilicon compounds are prepared by esterifying fluoroalkyl organosilicon compounds. The process proceeds uniformly under mild conditions with high yields and selectivities.
摘要:
The present invention relates to a stable composition of water-soluble organosiloxanes obtained by reacting a) a water-soluble amino-functional alkoxysilane with at least one water-insoluble alkenyl-functional alkoxysilane b) by adding water to form a mixture, and c) removing the alcohol formed during step b) from the mixture, where the amino-functional alkoxysilane and the water are used in the reaction at least in amounts such that substantially all of the alkoxy groups of the water-insoluble silane can react and such that when a resulting composition is diluted with water, essentially no alcohol is liberated by hydrolysis, and the composition, during an/or after the reaction, has a pH of from 2 to 6, the pH being preferably adjusted by adding an organic or inorganic, optionally aqueous, acid. In addition, the present invention discloses a process for the preparation of such a composition and also its use.
摘要:
An oligomerized polyorganosiloxane cocondensate which may be obtained, in part, by mixing an water-soluble amino-functional organosilane represented with at least one of the followoing: a fluoro-functional organosilane, an organosilane, and an organosilane. The cocondensate may be used, for example, in a method of treating surfaces.
摘要:
An alcoholic fluoroalkyl-functional group containing organosiloxane based composition is prepared by the controlled hydrolysis of at least one fluoroalkyl-functional group containing organosilane of formula I: R1—Y—(CH2)2SiHx(R2)y(OR)3−x−y (I), in which R1 is a mono, oligo- or perfluorinated alkyl group having 1-9 C atoms or a mono-, oligo- or perfluorinated aryl group, Y is a CH2, O or S group, R2 and R are each independently a linear, branched or cyclic alkyl group having 1-8 C atoms or an aryl group and x=0, 1 or 2 and y=0, 1 or 2, where (x+y)≦2, at a temperature in the range of 0-120° C. over a period of 0.5-24 hours and with thorough mixing in an alcoholic medium which contains water and a weak mono- or polybasic acid or a weak base or a weak mono- or polybasic acid and a weak base or an acid or basic salt, the water employed and the alkoxysilane employed being in a molar ratio of 2-500:1.
摘要:
Modified pearl luster pigments for waterborn coating systems, based on a platelet-form substrate coated with metal oxides and, located on the topmost metal oxide layer, a top layer consisting of at least two oxides and/or mixed oxides from the group consisting of silicon dioxide, aluminium oxide, cerium oxide, titanium oxide and zirconium oxide, and on a water-based oligomeric silane system. The oligomeric silane system can be described, for example, by the following approximate structure: [HO[Si(A)(OH)z(CH3)1−zO]a[Si(B)(OH)y(CH3)1−yO]b[Si(E)(OH)w(CH3)1−wO]c[Si(D)(OH)v(CH3)1−vO]dH].(HX)e (IX) where A=aminoalkyl radical derived from the general formula V, B=glycidyl ether alkyl radical derived from the general formula VI, E=acryloxyalkyl or methacryloxyalkyl radical of the general formula VII, D=alkyl radical of the general formula VIII, HX=monobasic acid, where X=inorganic or organic acid radical such as, for example, chloride, nitrate, formate, acetate, v is equal to 0 or 1 and w is equal to 0 or 1 and y is equal to 0 or 1 and z is equal to 0 or 1 and a+b+c+d≧4 and a≦e≦2a, where 0≦a/(b+c+d)≦3, especially for a/(b+c+d) equal to 0 if a=0 and/or c equal to d equal to 0 and b≧1 and also for 0.5≦a/(b+c+d)≦3.
摘要翻译:用于防水涂料体系的改性珍珠光泽颜料,基于涂覆有金属氧化物的片状基材,并且位于最上面的金属氧化物层上,由至少两种由硅组成的组的氧化物和/或混合氧化物组成的顶层 二氧化硅,氧化铝,氧化铈,氧化钛和氧化锆,以及水性低聚硅烷体系。 低聚硅烷体系可以例如通过以下近似结构来描述:其中A =衍生自通式V的氨基烷基,B =衍生自通式VI的缩水甘油醚烷基,E =一般的丙烯酰氧基烷基或甲基丙烯酰氧基烷基 式VII,D =通式VIII的烷基,HX =一元酸,其中X =无机或有机酸基,例如氯化物,硝酸盐,甲酸盐,乙酸盐,v等于0或1,w为 等于0或1,y等于0或1,z等于0或1,a + b + c + d> = 4,a <= e <= 2a,其中0 <= a /(b + c + d)<= 3,特别是对于a = 0和/或c等于d等于0且b> = 1而且对于0.5 <= a /( b + c + d)<= 3。
摘要:
Fluoroalkyl organosilicon compounds are prepared by reacting fluoroolefins with organosilicon compounds that contain at least one H--Si group, in the presence of a Pt(0) complex catalyst. Further, fluoroalkylalkoxy organosilicon compounds are prepared by esterifying fluoroalkyl organosilicon compounds. The process proceeds uniformly under mild conditions with high yields and selectivities.
摘要:
A process for the purification of crude N,N'-diphenyl-p-phenylenediamine (DPPD), which comprises extracting crude DPPD with a hydrocarbon or hydrocarbon mixtures thereby forming an extract solution containing DPPD, passing the extract solution over an adsorption layer, and recovering purified DPPD from the solution.