摘要:
This development is concerned with aromatic thermoplastic polycarbonates with special chain terminators which give the polymers enhanced hydrolysis resistance and impact toughness. These chain terminators are alkyl substituted monohydroxy phenyls in which each phenyl is substituted by one alkyl group having 8 or 9 carbon atoms and about 47 to 89% of its hydrogen atoms trisubstituted on carbon atoms with up to about 20% of the substituents in the ortho position and the balance at the para position. This development is also concerned with a process for synthesizing such polymers by using such chain terminators as reactants in generically known synthesis methods for polycarbonates.
摘要:
Aromatic polyesters and polyestercarbonates based on diphenols and iso- and/or terephthalic acids become flame-proof if admixed with small quantities of ammonium or alkali metal salts of inorganic or organic acids and optionally halophthalimides and optionally polytetrafluoroethylene. The mechanical and chemical properties of the polyester (carbonates) remain unchanged.
摘要:
The invention relates to a thermoplastic moulding composition comprising an aromatic high-molecular weight polycarbonate based on a diphenol, with a weight-average molecular weight (M.sub.w) of at least 10,000 and from 0.5 to 5% by weight, relative to the high molecular weight polycarbonate, of a polycarbonate which has an M.sub.w of from 1,200 to 9,000 and which corresponds to the formula (I): ##STR1## wherein "E" represents a radical of the formula (II): ##STR2## in which THE GROUPS R' are identical and denote H or halogenx is an integer of from 7 to 24"Z" is a divalent aromatic radical, and"n", the degree of polymerization, results from the M.sub.w between 1,200 and 9,000.
摘要:
Thermoplastic molding compositions are provided comprising from about 80 to 98% by weight of a polycarbonate obtained from diphenols, having a mean weight-average molecular weight M.sub.w from about 10,000 to 200,000 and from about 20 to 2% by weight of a polyester-carbonate and/or polyether-carbonate with mean weight-average molecular weights M.sub.w of from about 50,000 to 300,000, which contain between about 50 and 70% by weight of soft polyester segments or soft polyether segments with mean number-average molecular weights M.sub.n of from about 10,000 to 20,000. The instant invention also relates to a process for the production of said thermoplastic molding compositions. These thermoplastic molding compositions show markedly improved resilience properties compared with known polycarbonates and can be employed as films and shaped articles in all cases where, on the one hand, high notched impact strength at low temperatures, high toughness properties at relatively high wall thicknesses, and transparency are required.
摘要:
Thermoplastic aromatic polycarbonate molding compositions with improved flame retardancy which contain an alkali metal salt of an organic or inorganic acid and optionally a perfluoroethylene, characterized in that they contain a tetrahalogenophthalimide of the general formulae (I) or (II) or mixtures thereof ##STR1## wherein R denotes a hydrogen atom or a C.sub.1 to C.sub.4 l alkyl, C.sub.6 H.sub.5, C.sub.10 H.sub.7, C.sub.6 H.sub.4 X, C.sub.6 H.sub.3 X.sub.2 or C.sub.6 H.sub.2 X.sub.3 group, in which X denotes a fluorine, chlorine or bromine atom, R' denotes a single bond or a C.sub.2 to C.sub.4 alkylene, C.sub.6 H.sub.4 or p-diphenylene radical, and Z denotes a chlorine or bromine atom,are provided.
摘要:
The invention relates to a process for the preparation of polyphosphonic acid amides by condensation of 0.5-2 moles of a phosphonic acid diaryl ester and 1 mole of an aliphatic, aromatic, araliphatic or heterocyclic primary or secondary diamine in the melt at 50.degree.-350.degree. C., if appropriate in the presence of a catalyst which accelerates the condensation and under an inert gas atmosphere, the corresponding phenol being split off.
摘要:
The invention relates to an apparatus for the continuous production of continuous plastics foam webs from extruded polyolefin webs containing peroxide and blowing agent by cross-linking on a perforated conveyor belt with subsequent foaming, suspended freely in space into a continuous heating furnace.
摘要:
The present invention relates to a clear and transparent, scratch-resistant and weather-resistant laminate of high impact strength, consisting of a polycarbonate layer which, on at least one of its surfaces, carries a polyacrylate coating which, on its outer surface, is coated with a scratch-resistant and weather-resistant covering of a hydroxylated fluoropolymer which is cross-linked with methylmelamine and/or polysilicic acid. The present invention also relates to a process for the production of said scratch-resistant laminate.
摘要:
A process for the continuous production of a foamed foil from a polymer based on an .alpha.,.beta.-monolefinically unsaturated monomer wherein 0.05 to 0.2 % by weight of a diamide obtained by reacting an aliphatic diamine and at least one aliphatic monocarboxylic acid having at least 4 carbon atoms is added to the solid or molten polymer in addition to the chemical blowing agent before or while the polymer is processed.
摘要:
The invention relates to a process for the production of high molecular weight, crystalline, aromatic polyether ketones showing high temperature stability, high resistance to the effect of chemicals and good mechanical properties.