摘要:
There is described a process for the production of a compound of formula I, in which at least one each of Ri, R 2 and R 3 , and of R 4 , R 5 and R 6 , represents an electron withdrawing group, or one of R 1 , R 2 and R 3 together with one of R 4 , R 5 and R 6 form a -CO- group, and the remainder of Ri, R 2 , R 3 , R 4 , R 5 and R 6 , which may be the same or different, each represent an electron withdrawing group, alkyl, cycloalkyl, phenyl or phenylalkyl, or R 1 and R 2 , or R 4 and R 5 , and R 1 and R 4 , may together form a -(CH 2 )n- chain, in which n is a whole number up to 5, the alkyl, cycloalkyl, phenyl or phenylalkyl group or the -(CH 2 ) n ,- chain optionally being substituted, which comprises reacting a compound of formula II, in which Ria, R 2 a and R 3 a have the same significances as Ri, R 2 , and R 3 above, and some additional significances, with a compound of formula III, in which R 4 a, R 5 a and R 6 a have the same significances as R 4 , R 5 and R 6 above, and some additional significances, the reaction being carried out in an aqueous medium in the presence of a base and a surfactant.
摘要:
In a process for producing a polymer of monoallylamine comprising polymerizing monoallylamine, the polymerization is carried out using as a monomer inorganic acid salts (e.g., hydrochloride, sulfate, etc.) of monoallylamine in the presence of an azo type radical initiator such as 2,2'-azobis(2-methylpropionamidoxime), 2,2'-azobis(2-methyl- propionhydroxamic acid), etc. in a polar solvent such as water, an aqueous solution of zinc chloride, etc. By the process, polymers of monoallylamine having a high degree of polymrization can be obtained in high yield.
摘要:
Sterically stabilised aqueous polymer dispersions free from charged species are made by emulsifying in water ethylenically unsaturated monomer(s), soluble in water to the extent of 0.8% - 8% by weight but giving rise to a polymer which is insoluble, and polymerising the monomer(s) in that state in the presence of (a) a non-ionisable azo initiator which is water-soluble and substantially monomer-insoluble and (b) a block or graft copolymer stabiliser of specified structure.
摘要:
Disclosed are thermoplastic resins comprising block copolymers composed of polyester segments and vinyl polymer segments and having excellent thermal resistance and moldability, as well as several processes for preparing same. Among these thermoplastic resins, block copolymers formed of amorphous aromatic polyester segments and polystyrene resin segments are also useful as optical resins.
摘要:
Kationische Latices lassen sich in einfacher Weise da durch herstellen, daß man nichtionische Monomere mit bis zu 10 Gew.-% an kationischen Comonomeren in Emulsion in Gegenwart einer kationischen Azoverbindung polymeri siert.
摘要:
A catalyst component for an alpha-olefin polymerization catalyst (comprising an organoaluminium compound, an external electron donor and a solid catalyst component obtained by reaction of a magnesium-containing compound with a titanium halogen compound) is prepared by the steps of: (a) precipitating a water-soluble magnesium compound from an aqueous solution thereof using an alkali; (b) separating the solid magnesium component and dissolving it in hydrochloric acid; (c) evaporating the resultant solution until dry; (d)heating the salt mixture obtained at 130 to 150°C; (e) dissolving the magnesium component in ethanol; (f) drying the ethanolic solution of the magnesium component by periodic azeotropic distillation; (g) precipitating a solid carrier component from the ethanolic solution; and (h) reacting the solid carrier component with a titanium halogen compound in the presence of an internal electron donor or without an electron donor.
摘要:
By polymerizing an inorganic acid salt of monoallyl amine in a polar solvent in the presence of a radical initiator having, in its molecule, an azo group and a group having cationic nitrogen atom, a polymer of monoallylamine having a high degree of polymerization can be obtained in a high yield.
摘要:
A process for the preparation of 2,2'-azobis (2,4-dimethylpentanenitrile) with improved filtering and drying characteristics is described comprising reacting 2-amino-2,4-dimethylpentanenitrile with a metal hypochlorite in the presence of water, a mixture of hexadecyl- trimethylammoniumchloride with dioctyldimethylammonium chloride (or other mixture of tetra-alkylammonium surfactants of specified formula) and ionic bromide wherein the equivalent ratio of ionic bromide to surface active compound is 0.4:1 - 12:1 and the reaction temperature is about -10°C to about 30°C.
摘要:
Poly(allylamine salt) of high polymerization degree is obtained in high yield by the polymerization of monoallylamine salt with a specified radical-polymerization initiator having in the molecule an azo group. Various poly(allylamine) derivatives are obtained by reacting said poly(allylamine salt) with cyanic acid salts, acrylic compounds, or formic acid and formaldehyde.
摘要:
A stable aqueous suspension containing an organic azo compound as polymerization initiator in fine particles, containing substantially no organic solvent and containing no foam which damages dispersing stability of the aqueous suspension and retards polymerization rate can be formed by dissolving an organic azo compound in an organic solvent, emulsifying the resulting solution by adding water and a dispersing agent A and a dispersing agent B therto with stirring, and removing the organic solvent from the emulsified liquid preferably under reduced pressure.