摘要:
In a process for preparing expandable styrene polymers containing graphite particles, styrene is polymerized in aqueous suspension in the presence of graphite particles.
摘要:
Particulate expandable styrene polymers contain homogeneously distributed graphite particles and can be processed to give self-extinguishing foams having a density of ≦35 g/l.
摘要:
Bead-form, expandable styrene polymers containing, based on the styrene polymer, from 0.005 to 1.5% by weight of polyethylene wax and from 0.005 to 1% by weight of dimeric .alpha.-methylstyrene, and a process for the preparation thereof.
摘要:
An expandable styrene polymer comprisinga) a styrene polymer,b) from 1 to 10% by weight, based on a), of a saturated C.sub.3 - to C.sub.6 -hydrocarbon as blowing agent, and, if desired,c) conventional assistants in effective amounts, has a benzene content of less than 1 ppm and a styrene content of less than 2000 ppm.
摘要:
Expandable styrene polymers of high expandability comprisea) a styrene polymer having a viscosity, measured in toluene, of from 55 to 80 [ml/g] and a melt flow index MFI (190.degree. C., 3.8 kp) of from 7.5 to 30 [g/10 min],b) from 1 to 10% by weight, based on a), of a C.sub.3 - to C.sub.6 -hydrocarbon as blowing agent, and, if desired,c) conventional assistants in effective amounts.
摘要:
The present invention relates to expandable polystyrene beads containing blowing agent which are coated with from 0.01 to 0.5% by weight of a hydrophobicizing agent which melts above 25.degree. C. and has a mean particle size of less than 100 .mu.m. The beads can be converted into foam moldings having reduced water absorption capacity.
摘要:
A process for the preparation of bead-form expandable styrene polymers by polymerizing styrene, if desired in the presence of further comonomers, in aqueous suspension in the presence of organic molecular colloids as suspension stabilizers and conventional styrene-soluble polymerization catalysts and with addition of a blowing agent and, if desired, conventional additives in effective amounts, wherein the aqueous suspension contains at least one olefinically unsaturated carboxylic acid or a water-soluble salt thereof in an amount, based on the organic phase, of from 0.002 to 0.3% by weight of carboxylate anions.
摘要:
A process for the preparation of electrically conductive polyaromatics having conductivities greater than 10.sup.-2 S/cm, wherein from 0.5 to 15% by weight of an oxidizing Lewis acid, e.g. antimony pentafluoride or arsenic pentafluoride, or their NO.sup.+ - or NO.sub.2.sup.+ -salts, or a nitroaromatic, e.g. trinitrophenol or trinitrobenzenesulfonic acid, and/or a fluorine derivative, e.g. CF.sub.3 --COOH, or an acid, e.g. sulfuric acid, nitric acid or perchloric acid, is added to a polyaromatic, in the absence of moisture.
摘要:
Poly(acetylene) films are produced by polymerization of acetylene, if appropriate mixed with a di- and/or poly(alkyne), in the presence of an active transition metal catalyst on filaments, fibers, woven or knitted fabrics, nonwovens, laid webs, interlaced structures or nets composed of metals, glass or natural and/or synthetic fibers.
摘要:
Electrically conductive complexes of polypyrroles with nitroaromatic anions are prepared by polymerizing pyrrole, an N-alkylpyrrole and/or an N-arylpyrrole by anodic oxidation in a polar solvent, in the presence of a salt of an acidic nitroaromatic compound.