摘要:
These aqueous dispersions contain a copolymerizate containing 90 to 99% by weight of repeating units resulting from the polymerization of a mixture of monomers (a) based on 0.1 to 10% by weight of alpha,beta-ethylenic mono- and/or di-carboxylic C.sub.3 -C.sub.5 acid and/or their amides, 0 to 10% by weight of styrene and/or acrylonitrile, the remainder of the esters of (meth)acrylic acid with C.sub.1 -C.sub.12 alkanols; and 10 to 1% by weight of repeating units of general formula (I) ##STR1## where R=H or --CH.sub.3, R.sub.1 =H or C.sub.1 -C.sub.4 alkyl and R.sub.2 and R.sub.3 =C.sub.1 -C.sub.8 alkyl or a --CH.sub.2 --CR.sub.4 R.sub.5 --(CH.sub.2).sub.n --group in which n=0 or 1 and R.sub.4 and R.sub.5 =H or --CH.sub.3.
摘要:
The invention relates to a composition of matter especially adapted to injection into the ground, comprising an alkali metal silicate and at least one water-soluble aminoplastic resin, wherein the aldehyde is selected from the group comprising formaldehyde, glyoxal and a mixture of glyoxal and formaldehyde, and the nitrogenous compound is urea.
摘要:
The present invention relates to a composition intended for the preparation of facings by spraying by means of a hose a mixture based on rock wool (A), the composition having an almost instantaneous setting time and a formulation necessarily comprising a combination of (1) at least one powder product (B) containing at least 30% of sodium or potassium bicarbonate, the remainder comprising a compound of acid nature selected from the group comprising calcium chloride, sulfamic acid and sodium bicarbonate, in association with or without association with a solid silicate of sodium or potassium and (2) of at least an aqueous solution (C) of sodium or potassium silicate.
摘要:
The invention relates to stable water in oil dispersions, of hydrosoluble cationic polymers based on salified or quaternized dimethylaminoethyl acrylate copolymerized or not with acrylamide, and containing more than 5%(in moles) of cationic units uniformly and not statistically distributed along the chains, presenting a composition by weight of from 20 to 55% of polymers, from 20 to 45% of oil, from 1 to 5% of at least two emulsifying agents, and the balance to 100% being water, the oil phase being a mixture of normal C.sub.10 -C.sub.13 alkanes, one of the emulsifying agents having an HLB of 3 to 5, and good solubility in the oil phase, and a lipophilous group of a carbonated ramified chain of at least 16C and the other having an average HLB of 12 to 16, the percentages by weight of both agents being from 0.5 to 3% relative to the weight of the dispersion.
摘要:
The invention concerns a process for preparation of crystallized monohydrated sodium phenylpyruvate comprising: hot reacting benzaldehyde in an aqueous medium in the presence of a catalytic quantity of ethanolamine with the stoichiometric quantity of hydantoin, then treating the reactional medium hot at pH=14 through an excess of sodium hydroxide, acidifying to pH=9 with concentrated hydrochloric acid the so obtained solution and separating the formed precipitate.
摘要:
Strong cationic polyelectrolytes in powder form based on acrylamide and quaternized or salified dimethylaminoethyl acrylate; and the use thereof for flocculation of solid material suspensions and coalescence of emulsions.Such polyelectrolytes contain in molar proportions more than 50% of cationic units uniformly distributed along the copolymer chains. They are used for flocculating colloidal suspensions and/or coalescing emulsions, especially, in sewage water purification installations.
摘要:
Sodium paraformylphenolate crystallized with two molecules of water is manufactured by:(a) condensing glyoxylic acid with an excess of phenol in water in the presence of sodium hydroxide at a temperature comprised between 30.degree. C. and 100.degree. C.;(b) neutralizing the solution thus obtained and then freeing it from the unconverted phenol by steam distillation or extraction with a water-immiscible organic solvent and then subjecting it hot under a pressure of oxygen, to a catalytic decarboxylating oxidizing degradation in the presence of sodium hydroxide;(c) allowing the aqueous solution so-obtained, after removal of the catalyst by filtration, and then concentration hot under vacuum to 60% plus or minus 10% of its initial volume, to crystallize; and(d) draining the precipitated crystals, washing them and then drying them to constant weight under vacuum of 1 mm of mercury at 20.degree. C., to obtain sodium paraformylphenolate crystallized with 2 molecules of water or dried to constant weight under a vacuum of 1 mm of mercury at 100.degree. C. to obtain it in anhydrous form. The product is useful for preparing parahydroxy benzaldehyde quantitatively and without other purification reactions.
摘要:
The invention relates to a process of preparation of racemic hydroxyarylglycolic acids and the novel products resulting therefrom.According to such process glyoxylic acid is condensed in water in the presence of an alkaline agent at a temperature of between 35.degree. and 100.degree. C., on an excess, or not, of phenolic aromative derivative other than phenol, having at least one proton on either of the ortho or para positions with respect to the phenol function.Application to the production of novel acids such as 4-hydroxy 3-tertiobutyl mandelic acid, 2-hydroxy 5-tertiobutyl mandelic acid, 3-chloro 4-hydroxy mandelic acid, 2-fluoro 4-hydroxy mandelic acid, monohydrated 3,5-dimethoxy 4-hydroxy mandelic acid, 2-hydroxy 5-methyl mandelic acid, (1-hydroxy 2-naphthyl) glycolic acid, 4-ethyl 2-hydroxy mandelic acid, and 4-hydroxy 3-methyl mandelic acid.