摘要:
Colorant concentrates made from free-flowing polyoxymethylene copolymer as carrier, 15-80% by weight of colorant, 2-15% by weight of nitrogen-containing stabilizer and 0-15% by weight of dispersion aid for coloring pellets or molding compositions made from polyoxymethylene (POM) and for producing colored injection moldings or colored POM extrudates. The products produced with this colorant preparation are particularly stable during processing and have very low formaldehyde emissions.
摘要:
A continuous process for the preparation of polyacetal copolymers from 1,3,5-trioxane and the comonomers known for this purpose using strong protic acids as an initiator, in which the initiator is added in an amount of 0.01 to 0.6 ppm, based on the total amount of monomers, in finely divided form to the monomer mixture, after the polymerization step the crude polymer is transferred from the polymerization reactor to a mixing unit without further intermediate steps, excess monomer is removed from the crude polymer in the mixing unit or between polymerization reactor and mixing unit by applying reduced pressure and, if desired, generally customary stabilizers, assistants, fillers, reinforcing materials and/or colorants are incorporated into the polymer in the mixing unit.
摘要:
Shaped articles made from expanded minerals obtained by treating a mixture of a hydrophobized expanded mineral and a calcium aluminate with an aqueous solution of aluminum phosphate, and subsequently consolidating it under the action of pressure and heat; the expanded mineral having been hydrophobized with a hydrophobizing agent consisting substantially of(a) a fatty amine of the formula ##STR1## in which R.sub.1 is C.sub.8 -C.sub.22 -alkyl, preferably C.sub.14 -C.sub.22 -alkyl, C.sub.14 -C.sub.22 -alkenyl or C.sub.8 -C.sub.22 -alkylphenyl, R.sub.2 and R.sub.3 each are hydrogen, C.sub.1 -C.sub.4 -alkyl or C.sub.2 -C.sub.4 -alkenyl, phenyl or benzyl, and n is a number of from 0 to 4;(b) a fatty acid of the formulaR.sub.5 CO(OCH.sub.2 CH.sub.2).sub.m OH or a fatty alcohol of the formulaR.sub.6 (OCH.sub.2 CH.sub.2).sub.m OH in which R.sub.5 is C.sub.8 -C.sub.22 -alkyl, preferably C.sub.14 -C.sub.22 -alkyl or -alkenyl, R.sub.6 is C.sub.9 -C.sub.23 -alkyl, preferably C.sub.15 -C.sub.23 -alkyl or -alkenyl, and m is a number of from 0 to 2; and(c) a low molecular weight acid.
摘要:
Shaped articles made from expanded minerals, otained by using a mineral binder system composed either of calcium aluminate and aluminum phosphate or of waterglass and a catalyst to consolidate an expanded mineral which has been rendered hydrophobic and wherein the expanded mineral is rendered hydrophobic by means of an organosiloxane.
摘要:
A process is described for the production of a carrier web of a spun bond consisting of synthetic polyester filaments having a melting point of more than 230.degree. C and a filament titer of approximately 3 to 15 dtex. To this spun bond, a chemical binder is applied in the form of an aqueous dispersion which is dried at approximately 120.degree. to 220.degree. C. The dispersion consists of(a) 10 to 60% by weight of a copolymer of60 to 90% by weight of styrene,5 to 20% by weight of butadiene,2 to 10% by weight of acrylic acid and2 to 10% by weight of acrylamide,(b) 5 to 30% by weight, calculated on the amount of copolymer, of a melamine formaldehyde precondensate,(c) a catalytic amount of acid catalysts, as well as, optionally,(d) further inert additives.Such a carrier web is characterized bya weight per unit area of approximately 80 to 400 g/m.sup.2A strength, longitudinally, of approximately 30 to 140 daN/5 cm,An elongation at break, longitudinally, of approximately 20 to 50%,A break propagation resistance of approximately 2 to 9 daN,a specific resistance of at least 38 (daN/5 cm) : (100 g/m.sup.2) andA specific elongation, longitudinally, at 180.degree. C and5 daN/5 cm load, of 600% .multidot. g/m.sup.2 maximum.
摘要:
An inorganic, phosphate-containing cellular material is manufactured from Portland cement, polyphosphoric acid and an expanding agent acting in an acidic medium. There may be added furthermore aluminous cement, oxides of calcium, zinc, aluminum, iron, hydroxides of aluminum and iron, fillers and reinforcing agents. By intense intermixing of the starting products a mixture is prepared which has an equivalent ratio of (Al+Mg+CA+Fe) to phosphate of 0.8:1 to 3.0:1. The mixture foams, is charged to a mold, heated if necessary to a temperature of 80.degree. C., and after completed exothermal reaction hardened under heat.
摘要翻译:无机磷酸盐的多孔材料由波特兰水泥,多磷酸和在酸性介质中起作用的发泡剂制造。 还可以添加有水泥,钙,锌,铝,铁,铝和铁的氢氧化物,填料和增强剂的氧化物。 通过起始产物的强烈混合,制备的混合物的(Al + Mg + CA + Fe)与磷酸盐的当量比为0.8:1至3.0:1。 将混合物泡沫充入模具中,如果需要,加热到80℃的温度,并且在完成的放热反应在加热之后硬化。
摘要:
Limpid solutions suitable for making filaments and sheets of mostly aromatic polyamides are obtained by precondensation of the initial materials up to a conversion rate of from 80 to 98% in a solvent, neutralization with ammonia, separation of the insoluble ammonium halide, addition of an inorganic base, evacuation of the ammonia set free, subsequent after condensation and neutralization of the hydrogen halide newly formed.The spinning solutions prepared according to this process are stable and limpid and are excellently suitable for the preparation of shaped articles.