摘要:
Halogen-containing s-triazine compounds of the formula I ##STR1## where R is OH, R.sup.1, R.sup.2 or R.sup.3, R.sup.1 is ##STR2## where R.sup.4 is lower alkyl or lower haloalkyl, X is bromine or chlorine, k and n are 0 or integers from 1 to 5 and k+n is not more than 5, R.sup.2 is ##STR3## where R.sup.5 is lower alkyl or lower haloalkyl, Z is bromine or chlorine, s and p are 0 or integers from 1 to 4 and s+p is not more than 4, and R.sup.3 is ##STR4## where R, R.sup.5, Z, s and p have the above meanings. The compounds claimed are prepared by reacting cyanuric chloride with a phenol of the formula III ##STR5## and a benzene derivative of the formula IV ##STR6## in the presence of a base. The products thereby obtained are used for flameproofing thermoplastics, in particular styrene/acrylonitrile copolymers made impact-resistant with rubber (ABS resins).
摘要:
A mixture of brominated oligomeric polystyrenes, having a degree of polymerization of from 3 to 400, and low molecular weight brominated aromatic compounds of the diphenyl ether type is obtained by polymerizing the non-brominated starting materials, in a halohydrocarbon solvent, using a Lewis acid catalyst. The reaction mixture is then brominated and extracted with water to remove hydrogen bromide and catalyst, and the solvent and volatile constituents are separated from the product. The bromination is carried out at from -30.degree. C. to +130.degree. C. The final mixtures have a low melt viscosity and are therefore particularly suitable for incorporation, as a flameproofing agent, into thermoplastics.
摘要:
The invention relates to novel polyolefin compositions having a low coefficient of thermal expansion (CLTE), high stiffness and high flowability. The novel compositions comprise a heterophasic propylene copolymer, an inorganic filler, an ethylene/alpha-olefin elastomer and at least two different alpha-nucleating agents.
摘要:
The use of a thermoplastic molding composition differing from ABS and comprising, based on a total of 100% by weight of amounts of components A and B, and, if desired, C and/or D,a: as component A, from 1 to 99% by weight, preferably from 15 to 60% by weight, in particular from 25 to 50% by weight, of a particulate emulsion polymer with a glass transition temperature of below 0.degree. C. and with a median particle size of from 50 to 1000 nm, preferably from 50 to 500 nmb: as component B, from 1 to 99% by weight, preferably from 40 to 85% by weight, in particular from 50 to 75% by weight, of at least one amorphous or partly crystalline polymer,c: as component C, from 0 to 50% by weight of polycarbonates, andd: as component D, from 0 to 50% by weight of fibrous or particulate fillers or mixtures of these for producing housings for security equipment.
摘要:
The use of a thermoplastic molding composition differing from ABS and comprising, based on a total of 100% by weight of amounts of components A and B, and, if desired, C and/or D,a: as component A, from 1 to 99% by weight, preferably from 15 to 60% by weight, in particular from 25 to 50% by weight, of a particulate emulsion polymer with a glass transition temperature of below 0.degree. C. and with a median particle size of from 50 to 1000 nm, preferably from 50 to 500 nmb: as component B, from 1 to 99% by weight, preferably from 40 to 85% by weight, in particular from 50 to 75% by weight, of at least one amorphous or partly crystalline polymer,c: as component C, from 0 to 50% by weight of polycarbonates, andd: as component D, from 0 to 50% by weight of fibrous or particulate fillers or mixtures of thesefor producing moldings for sanitary and bathroom fittings.
摘要:
In a process for preparing block copolymers of styrene or its equivalents on the one hand and of butadiene or its equivalents on the other hand by sequential anionic polymerization, in which a first monomer and the organometallic compound serving as initiator are first of all combined to form a reaction mixture and the reaction is continued until at least part of the first monomer has been consumed, and then at least one further monomer is added and is in each case partially or completely reacted, the polymerization is carried out continuously in a conventional manner in a tubular reactor, the reaction of in each case one monomer being carried out in each case in one reactor section and at least two reactor sections being separated by a mixing stretch.
摘要:
A process is described for preparing styrene polymers by continuous anionic polymerization, the monomer or monomers and the organometallic compound serving as starter (initiator) being added in solution to a tubular reactor operating essentially without backmixing and being left in the reactor until the monomer has been consumed, wherein the polymerization is carried out in at least two successive tubular reactor sections operating in each case essentially adiabatically, with in each case at least one heat exchanger arranged between the sections. If desired a proportion of the starter and/or of the monomer is added to at least one reactor connected downstream of the first reactor.
摘要:
A metering apparatus for introducing free-flowing, powdered substances in a controlled manner into spaces under pressure consists of a storing unit,a proportioning unit consisting of a shaft which is sealed in a housing with the aid of sealing rings and glands, can be rotated alternately through 180.degree. in each case and is provided with two depressions opposite one another, for accepting and discharging the substance respectively,an end unit consisting of a cylindrical cavity, which is sealed with the aid of sealing rings and glands and has a nozzle-like shape toward the space under pressure, and a spindle which is arranged concentrically with respect to the cavity, is capable of making to and fro stroke-like movements and, at its tip, has a slope corresponding to that of the nozzle-like feed, the end unit being arranged flush with the wall of the space,a connecting line between the storing unit and the accepting depression within the proportioning unit, a connecting line between the discharging depression within the proportioning unit and the cavity of the end unit, andtwo connections for inert gas.
摘要:
The use of a thermoplastic molding composition differing from ABS and comprising, based on a total of 100% by weight of amounts of components A and B, and, if desired, C and/or D, a: as component A, from 1 to 99% by weight, preferably from 15 to 60% by weight, in particular from 25 to 50% by weight, of a particulate emulsion polymer with a glass transition temperature of below 0° C. and with a median particle size of from 50 to 1000 nm, preferably from 50 to 500 nm b: as component B, from 1 to 99% by weight, preferably from 40 to 85% by weight, in particular from 50 to 75% by weight, of at least one amorphous or partly crystalline polymer, c: as component C, from 0 to 50% by weight of polycarbonates, and d: as component D, from 0 to 50% by weight of fibrous or particulate fillers or mixtures of these for producing sheet-like wall elements and fastening parts therefor.
摘要:
The use of a thermoplastic molding composition differing from ABS and comprising, based on a total of 100% by weight of amounts of components A and B, and, if desired, C and/or D,a: as component A, from 1 to 99% by weight, preferably from 15 to 60% by weight, in particular from 25 to 50% by weight, of a particulate emulsion polymer with a glass transition temperature of below 0.degree. C. and with a median particle size of from 50 to 1000 nm, preferably from 50 to 500 nm,b: as component B, from 1 to 99% by weight, preferably from 40 to 85% by weight, in particular from 50 to 75% by weight, of at least one amorphous or partly crystalline polymer,c: as component C, from 0 to 50% by weight of polycarbonates, andd: as component D, from 0 to 50% by weight of fibrous or particulate fillers or mixtures of thesefor producing covering grid plates for ventilator openings.