摘要:
The invention relates to a nontoxic polysiloxane material and ripened polysiloxane material which has been formed using one or more different polysiloxane materials. According to the invention, such a ripened polysiloxane material can be spun, for example, into bioabsorbable and/or bioactive fibers and then be further processed into fibrous nonwoven webs.
摘要:
A coated glass product includes a glass substrate and a porous antireflection surface coating including SiO2-based particles having a first particle fraction including a first characteristic particle size range and a second particle fraction having a second characteristic particle size range that is different from the first characteristic particle size range. In addition, a method for producing the coated glass product is provided.
摘要:
The intermediate product which is used in a method of making a molded arte, especially an endless PZT fiber, is itself made by a method including mixing an organic zirconium compound, Zr(OR.sup.1).sub.4, and an organic titanium compound, Ti(OR.sup.2).sub.4, R.sup.1 and R.sup.2 being C.sub.1 - to C.sub.10 -alkyl groups, separately or together with 0 to 4 moles of at least one alcohol of the formula R.sup.3 --X--R.sup.4 --OH or R.sup.3 --CX--R.sup.4 --OH, X being O, S or an amine group and R.sup.3 and R.sup.4 being C.sub.1 - to C.sub.10 -alkyl groups, per mole of the zirconium and titanium compounds; reacting the zirconium and titanium compounds in the resulting mixture or mixtures with one to three moles of at least one C.sub.2 - to C.sub.10 -carboxylic acid per mole of the zirconium and titanium compounds to form at least one reaction mixture; mixing the at least one reaction mixture and reacting with 1 to 1.5 moles of one or more Pb(II)-carboxylates and/or Pb(IV)-carboxylates per mole of the zirconium and titanium compounds to form a combined mixture; subjecting this combined mixture to a hydrolytic condensation and then removing the volatile components from it to form a solid mass at ambient temperatures.
摘要:
The invention relates to polytitanic acid esters having linear cross-linking structures, obtainable by reacting a titanium compound that is soluble in an alcohol, in water or in a mixture of water and alcohol and that has the composition (I) Ti(R)mXn (I), wherein the groups R independently mean alkoxy, carboxy, or OH, X means halogen, m=0 to 4, n=0 to 4, and m+n=4, with a compound (II) that contains the following structural unit: [O═CR4—(CR5R3)p—CR1R2—O]−, wherein p is 0 or 1 and wherein(a) R1 and R2 are independently selected from among hydrogen, alkyl and alkenyl, R3 and R5 are independently selected from among hydrogen or an unsubstituted or substituted alkyl or alkenyl, R4 is OH or O(Mx+)1/x, wherein M is a metal or ammonium and x is 1 or 2, or(b) R1 and R2 together mean ═O and R3, R5 and R4 are independently selected from among hydrogen, alkyl and alkenyl,wherein the titanium compound (I) is reacted with compound (II) at a molar ratio of 1 to 0.5-1.9, with respect to an unbridged titanium compound, i.e., a (monomeric) titanium compound containing a single titanium atom, with the stipulation that, if compound (I) has no more than 2 hydroxy groups, and if the reaction occurs in a water-free medium, the product formed by the reaction is then brought in contact with water in such a way that a hydrolytic condensation reaction of the produced titanium compound(s) occurs in all cases.Such polytitanic acid esters can be spun in the form of viscous masses to create fibers.
摘要:
The present invention relates to a coating material containing (a) first oxidic particles formed by hydrolytic condensation, in a size range of 5-20 nm, (b) second particles with a diameter in the size range of 80-300 nm, (c) a first aqueous solvent in which the source material for the oxidic particles formed by hydrolytic condensation can be dissolved and which allows or promotes the hydrolysis and condensation thereof, and (d) at least one second solvent, selected among specifically defined alcohols, ethers, organic acids, esters, ketones, amines and amic acids and mixtures thereof. The invention relates in addition to a substrate supplied with a coating, particularly a glass suitable for the photovoltaic and warm water collector domain, wherein the coating is composed of at least two particle fractions, wherein the particles of the first fraction have a diameter in the size range of 5-20 nm, and the particles of the second fraction have a diameter in the size range of 80-300 nm, wherein the particles of the second fraction have an average distance from each other, measured from cone to cone of these particles, of on average 20-200 nm, and wherein the particles of the first particle fraction have pores with a pore radius distribution of which the maximum is between 1 and 6 nm. The coating of the substrate can be achieved by means of the named coating material.
摘要:
The invention relates to a nontoxic polysiloxane material and ripened polysiloxane material which has been formed using one or more different polysiloxane materials. According to the invention, such a ripened polysiloxane material can be spun, for example, into bioabsorbable and/or bioactive fibres and then be further processed into fibrous nonwoven webs.
摘要:
The endless PZT fiber is a lead zirconate-lead titanate mixed substance ands made by a method including the steps of mixing an organic zirconium compound, Zr(OR.sup.1).sub.4, and an organic titanium compound, Ti(OR.sup.2).sub.4, R.sup.1 and R.sup.2 each being a C.sub.1 - to C.sub.10 -alkyl group, separately or together with 0 to 4 moles of at least one alcohol of the formula R.sup.3 --X--R.sup.4 --OH or R.sup.3 --CX--R.sup.4 --OH, X being O, S or an amine group and R.sup.3 and R.sup.4 each being a C.sub.1 - to C.sub.10 -alkyl group, per mole of the zirconium and titanium compounds; reacting the zirconium compound and titanium compounds in the resulting mixture or mixtures with one to three moles of at least one C.sub.2 - to C.sub.10 -carboxylic acid per mole of the zirconium and titanium compounds to form at least one reaction mixture; mixing the at least one reaction mixture from the reacting step with 1 to 1.5 moles of one or more Pb(II)-carboxylates and/or Pb(IV)-carboxylates per mole of the zirconium and titanium compounds to form a combined mixture; subjecting this combined mixture to a hydrolytic condensation and then removing the volatile components from it to form a solid mass at ambient temperatures; heating the solid mass at 150.degree. C. until a viscous liquid is formed; drawing the PZT fiber from the viscous liquid and heating it at a temperature at least equal to 500.degree. C.
摘要:
A sol-gel process for producing layers of zirconium oxide is described which comprises the following stages: (i) production of a soluble, zirconium-containing powder by: (a) reaction of a zirconium alcoholate of the general formula Zr (OR)4, in which the residues R are the same or different and represent straight-chain, branched or cyclic alkyl or alkenyl residues with 1 to 10 carbon atoms, which optionally exhibit one or more carbonyl and/or ester and/or carboxyl functions, with one or more polar compounds having complexing, chelating properties, (b) heating the solution, (c) mixing the solution with water, optionally in the presence of a catalyst, (d) concentrating the solution until a powder is obtained, (ii) dissolving the powder forming a sol, (iii) coating a substrate with the sol, and (iv) annealing the coated substrate.
摘要:
A method of and a solution for making a highly porous optical antireflection coating of a selectively designed index of refraction, by applying a colloidal dispersion derived from hydrolytically condensing, in the presence of water and a catalyst, one or more silicon compounds of the general formula RaSiX4-a, or precondensates derived therefrom, to a substrate. In the formula, R is an organic group having from 1 to 10 carbon atoms which may be interrupted by oxygen atoms and/or sulfur atoms and/or amino groups, X is hydrogen, halogen, hydroxy, alkoxy, acyloxy, alkylcarbonyl, alkoxycarbonyl or NR′2, R′ being hydrogen, alkyl or aryl and a being 0, 1 or 2. The solution also contains colloidally dispersed organic polymers at a molar ratio, relative to the silane, between 0.1 mmol/mol silane and 100 mmol/mol silane, the median molecular mass of the polymer being between 200 and 500,000. Sol-vents, preferably alcohol, may also be present in the solution. After being applied to an optical substrate, the solution is dried and organic components are removed from it to leave a porous coating of predetermined index of refraction.