摘要:
Emulsifiers are made by esterifying one or two of the carboxyl groups of citric acid with a hydroxy-ester formed from a long chain alcohol and an acid of formula:
摘要:
Allylic primary and secondary alcohols are prepared by rearranging allylic tertiary alcohols in the presence of a catalyst comprising a metal of group Va, VIa or VIIa of the Periodic Table of Mendeleev.
摘要:
2,2''-DITHIAZOLYL DISULPHIDES, SUCH AS 2,2''-DIBENZOTHIAZOLYL DISULPHIDE, ARE OBTAINED BY OXIDISING THE CORRESPONDING 2MERCAPTO-THIAZOLE WITH MOLECULAR OXYGEN AND IRON CHLORIDE USING AS SOLVENT A SATURATED ALIPHATIC ALCOHOL CONTAINING 1-10 CARBON ATOMS.
摘要:
An aqueous emulsion of a silicone is prepared using, as emulsifier, a sucroglyceride e.g. a transesterification product of sucrose and a triglyceride. The resulting emulsions are stable, even under basic conditions, and have better anti-foaming properties and provide more satisfactory non-stick surfaces than emulsions using conventional emulsifiers.
摘要:
A process for the continuous preparation of a mixture of a cycloalkanone and cycloalkanol by oxidation of a cycloalkane in the liquid phase by means of a gas containing molecular oxygen, followed by heating the resulting solution of cycloalkyl hydroperoxide in the corresponding cycloalkane, at 80*-150*C. in the presence of a soluble chromium derivative as a catalyst, wherein at least a part of the heating of the hydroperoxide solution is carried out in the presence of a monoester or diester of ortho-phosphoric acid which is soluble in the reaction medium. The presence of the phosphate ester prevents buildup of a deposit on the walls of the dehydroperoxidation reactor.
摘要:
Phenylhydrazone derivatives of the formula: WHEREIN R represents alkyl of 1 to 10 carbon atoms and Ar represents phenyl substituted by three atoms or radicals selected from halogen, alkyl or 1 to 4 carbon atoms, alkoxy of 1 to 4 carbon atoms, alkenyloxy of 2 to 4 carbon atoms and alkynyloxy of 2 to 4 carbon atoms, at least one of the substituents on the phenyl radical being an alkoxy, alkenyloxy or alkynyloxy radical, which are new compounds, possess insecticidal and acaricidal properties.
摘要:
The adhesion between inorganic oxides and photoresistant polymers is improved by, prior to contacting the oxide and the polymer, treating the oxide with (a) an aminosilane of the formulae R3SiNHR'' and R2Si(NHR'')2; or a polysilazane, with the exception of hexaalkyldisilazanes, having 0.8 to 3 organic groups per silicon atom, and having units of the formulae R3Si(NH)0.5, R2SiNH, RSi(NH)1.5 or Si(NH)2, in which formulae each R, which may be identical or different, represents hydrogen or an alkyl radical of 1 to 8 carbon atoms, an alkenyl radical of 2 to 4 carbon atoms, a cycloalkyl radical of 5 to 6 carbon atoms in the ring, an aryl radical of 6 to 8 carbon atoms, a benzyl radical, an alkoxy radical of 1 to 6 carbon atoms or an aryloxy radical of 6 to 8 carbon atoms; each R'' represents hydrogen or an alkyl radical of 1 to 4 carbon atoms; or (b) a cyclopolysiloxazane of the general formulae:
IN WHICH FORMULAE EACH R'''', which may be identical or different, represents a methyl or phenyl radical, at least 40% of these radicals being methyl radicals; m represents an integer of 2 to 5 and the symbols n, which are identical, each is 1 to 2.
摘要:
Fluidisable powder suitable for imparting crack-resistant coatings to articles subjected to high temperature are obtained from particles of dimensions between 5 and 200 Mu of a mixture of a prepolymer derived from N,N''-bis-imides of an unsaturated carboxylic acid and diprimary diamines and of glass micro-spheres and/or mica particles.
摘要:
Sulphones of the formula QSO2CH C(CH3)-CH CH2 wherein Q represents an optionally substituted, saturated or unsaturated terpene radical of 5n carbon atoms, n being 1-9, apart from 3methylbutadienyl and 2-butadienylmethyl, are intermediates for adding isoprene units. They are made from novel alkali metal 2methylbutadienylsulphinates.
摘要:
IN WHICH R represents a linear or branched alkylene radical containing 2 to 6 carbon atoms. They are particularly suitable as sutures.
Implantable surgical articles are provided which are at least partially bioresorbable and which consist at least partially of a polyester of succinic acid possessing a plurality of units of the general formula: