摘要:
A continuous anionic polymerisation or copolymerisation process of styrene or diene monomers with alkali metal alkyl as polymerisation initiator is carried out in the presence of a metal alkyl or aryl of an at least bivalent element as reaction speed regulator, preferably in non-isotherm conditions and without a back admixture in a pipe or pipe bundle reactor. A metal alkyl or aryl A of formula R1M1 and a metal alkyl or aryl B of formula R2nM2 in a molar ratio between B and A from 0.1:1 to 500:1 are used. In the formulas, M1 is Li, Na or K; R1 is hydrogen, C¿1?-C20-alkyl or C6-C20-aryl or C7-C20-alkyl-substituted aryl; M?2¿ is an n-valent element of groups 2a, 2b or 3a of the periodic table of elements; and R2 is hydrogen, halogen, C¿1?-C20-alkyl or C6-C20-alkyl. Also disclosed is a special initiator for the anionic polymerisation which does not contain any Lewis bases.
摘要:
The invention relates to a nanocomposite containing (I) a star-shaped, branched block copolymer made of vinylaromatic monomers and dienes and (II) a layer silicate. The invention also relates to a method for the production thereof.
摘要:
The invention relates to a carbon nanotube reinforced thermoplastic molding composition. This thermoplastic molding composition is produced from a graft copolymer containing single wall carbon nanotubes and a thermoplastic polymer. The graft copolymer is produced from a soft elastomeric particulate graft base with a glass transition temperature below 0°C obtained by emulsion polymerization of a conjugated diene alone or with a small amount of a monoethylenically unsaturated monomer or of at least one C 1 -C 18 -alkyl acrylate, or of mixtures of these, upon which is grafted a vinyl aromatic monomer and acrylonitrile and optionally another monoethylenically unsaturated monomer. The synthesis of the aqueous latex of the graft copolymer is performed in the presence of a dispersion of carbon nanotubes (CNTs) in an aqueous medium. For the dispersing step of the carbon nanotubes (CNTs) in aqueous solution, a salt of an amphiphilic polymer is used.
摘要:
The invention relates to a method for extracting polyamide particles or polymer particles which contain polyamides with aqueous extraction agents. According to the invention, aqueous solutions of amino nitriles and optional additional monomers which form polyamides, or oligomers which form polyamides, or mixtures thereof are used as aqueous extraction agents.
摘要:
The invention relates to a method for homopolymerization of vinyl-aromatic monomers or copolymerization of vinyl-aromatic monomers and dienes in the presence of at least one alkali metal compound and at least one compound of an element from Group 3a of the periodic table, wherein the compounds contain, in relation to the sum of molar equivalence of the alkali metal and the elements from Group 3a: a) 0.1 to 3.9 molar equivalents of oxygen, sulfur, nitrogen or phosphorus and b) 0.1 to 3.9 molar equivalents of an organyl ligand.
摘要:
The invention concerns biologically degradable polyester amides P1 obtainable through reaction of a mixture consisting essentially of the following: (a1) a mixture consisting essentially of: 35-95 mol % adipic acid or ester-forming derivatives thereof or mixtures thereof, 5-65 mol % terephthalic acid or ester-forming derivatives thereof or mixtures thereof, and 0-5 mol % a compound containing sulphonate groups (the sum of the individual molar percentages is 100); (a2) a mixture consisting essentially of: (a21) 99.5-0.5 mol % a dihydroxy compound chosen from the group comprising C2-C6 alkane diols and C5-C10 cycloalkane diols, (a22) 0.5-99.5 mol % an amino C2-C12 alkanol or an amino-C5-C10 cycloalkanol, (a23) 0-50 mol % a diamino C1-C8 alkane; and (a24) 0-50 mol % a 2,2`-bisoxazoline of general formula (I), in which R is a single bond, a (CH2)q-alkylene group in which q = 2, 3 or 4, or a phenylene group (the sum of the individual molar percentages is 100 and the molar ratio of a1 to a2 is in the range 0.4:1 - 1.5:1). The polyester amides P1 will have a molecular weight (Mn) in the range 4000-40,000 g/mol, a viscosity number in the range 30-350 g/ml (measured in o-dichlorobenzene/phenol (weight ratio 50/50) at a concentration of 0.5 wt.% polyester amide P1 at a temperature of 25 DEG C) and a melting point in the range 50-220 DEG C; and a quantity of a compound D equivalent to 0-5 mol % of the molar quantity of components (a1) must also be used for the production of the polyester amides P1, said compound D having at least three groups capable of ester formation. The invention also concerns other biologically degradable polymers and thermoplastic moulding materials, processes for manufacturing the same, the use thereof for producing biologically degradable moulded articles and adhesives, and biologically degradable moulded articles, foams and blends with starch which can be obtained from the polymers or moulding materials according to the invention.
摘要:
Biodegradable polyesters P1 obtainable through the reaction of a mixture consisting essentially of: (a1) a mixture consisting essentially of 35 to 95 mol.% adipic acid, ester-forming derivatives thereof or mixtures thereof, 5 to 65 mol.% terephthalic acid, ester-forming derivatives thereof or mixtures thereof, and 0 to 5 mol.% of a compound containing sulphonate groups, in which the sum of the individual mol percentages is 100; and (a2) a dihydroxy compound selected from the group consisting of C2-C6alkane diols and C5-C10cycloalkane diols, the molar ratio of (a1) to (a2) being in the range from 0.4:1 to 1.5:1, provided that the polyesters P1 have a molecular weight (Mn) in the range from 5000 to 50 000 g/mol, a viscosity index in the range from 30 to 350 g/ml (measured in o-dichlorobenzol/phenol (weight ratio 50/50), at a concentration of 0.5 wt.% polyesters P1 at a temperature of 25 °C) and a melting point in the range from 50 to 170 °C, and with the further provisos that from 0.01 to 5 mol.% related to the molar quantity of the component (a1) used of a compound D with at least three groups capable of ester formation are added to product the polyesters P1 and that the polyesters P1 contain both hydroxyl and carboxyl terminal groups, the molar ratio of carboxyl to hydroxyl terminal groups being greater than one. The invention also relates to further biodegradable polymers and thermoplastic casting compounds, process for their production, their use in the manufacture of biodegradable casting compounds and adhesives, biodegradable mouldings, foams and blends with starch obtainable from the polymers or casting compounds of the invention.
摘要:
The invention concerns biodegradable polyether esters obtained by reacting a mixture consisting of: (a1) 95 to 99.9 wt % polyether ester P1, obtained by reacting a mixture consisting of: (b1) a mixture consisting of: 20 to 95 mol % adipic acid or esterifying derivatives thereof or mixtures thereof; 5 to 80 mol % terephthalic acid or esterifying derivatives thereof or mixtures thereof; and 0 to 5 mol % of a sulphonate group-containing compound; and (b2) a mixture of dihydroxy compounds, essentially consisting of: (b21) 15 to 99.8 mol % of a dihydroxy compound; and (b22) 85 to 0.2 mol % of an ether function-containing dihydroxy compound as per formula (I) HO-[(CH2)n-O]m-H, in which n stands for 2, 3 or 4 and m stands for an integer from 2 to 250, or mixtures thereof, the molar ratio of (b1) to (b2) ranging from 0.4:1 to 1.5:1; (a2) 0.1 to 5 wt % of a divinylether C1; and (a3) 0 to 5 mol % of compound D; as well as further biodegradable polymers and thermoplastic moulding compounds. The invention also concerns a process for their preparation, their use for producing biodegradable moulded bodies and adhesives, and biodegradable moulded bodies, foams and blends with starch obtained from the polymers and moulding compounds according to the invention.