摘要:
A carbonate corresponding to formula (I) ##STR1## in which R is aromatically bound polystyrene moiety and --O--D--O-- is a diphenolate moiety in which --D-- is a divalent group containing 6 to 30 carbon atoms and r is 0 or 1 is disclosed. The carbonate is useful as a flow aid for thermoplastic molding compositions.
摘要:
The invention relates to poly(meth)acrylates having grafted-on polycarbonate chains, to their production and to their use as modifiers for thermoplastic polycarbonates having improved resistance to gasoline and/or improved impact strength at low temperatures and to their production.
摘要:
Polyester-carbonate/polysiloxane block copolymers containing the following recurring structural units: ##STR1## wherein the structural units (1) comprise at least 75 wt.% of the sum of the structural units (1) and (2), exhibit better low temperature tough fracture properties than the known polyester-carbonate/polysiloxane block copolymers containing comparable recurring structural units on comparison of polyester-carbonate/polysiloxane block copolymers of the same heat resistance.
摘要:
The present invention relates to a process for the isolation of polycarbonates containing 18 to 45 mol % of structural units consisting of sulphone-bisphenols, characterized in that the sulphone-bisphenols are subjected to a polycondensation reaction with oligocarbonates containing chloroformic acid ester end groups, the phases are separated, the organic phase is purified and the sulphone-bisphenol polycarbonates are isolated.
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:
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 moulding compositions of1. 80 to 20 parts by weight of a thermoplastic polycarbonate based on bis-(hydroxyaryl)-alkanes,2. 20 to 80 parts by weight of a graft polymer of 20 to 90% by weight of a mixture of 95 to 5 parts by weight of styrene and/or methyl methacrylate, 50 to 5 parts by weight of acrylonitrile or methacrylonitrile and 50 to 0 parts by weight of a N-substituted maleic imide the total being 100 parts by weight on 10 to 80% by weight of a rubber,3. 0 to 75 parts by weight of a copolymer of 95 to 50% by weight of styrene and/or methyl methacrylate and 50 to 5% by weight of acrylonitrile or methacrylonitrile,4. 2 to 75 parts by weight of a copolymer of 95 to 50 parts by weight of styrene and/or methyl methacrylate, 40 to 5 parts by weight of acrylonitrile or methacrylonitrile, 2 to 40 parts by weight of a N-substituted maleic imide.
摘要:
The present invention relates to a process for the modification of thermoplastic aromatic polycarbonates containing aromatically bonded halogen, primary alkyl, secondary alkyl and/or alkenyl substituents, characterized in that these polycarbonates are irradiated with UV light, after adding between about 1 and 5% by weight, preferably between about 1 and 3% by weight, relative to the weight of polycarbonate, of photoinitiators and optionally between about 0.05 and 5% by weight, preferably between about 0.1 and 2% by weight, relative to the weight of polycarbonate, of flame-proofing agents. The present invention also relates to the modified polycarbonates obtainable by the process according to the invention.
摘要:
A process for producing a graft copolymer is disclosed. The graft copolymer, based on a rubber which contains phenolic OH groups and grafted with polycarbonate chains is produced under the conditions of the two-phase interfacial polycondensation. Also disclosed are gasoline resistant thermoplastic polycarbonate compositions containing the graft.
摘要:
Thermoplastic polyphosphonatocarbonate prepared by polycondensing at least one aromatic dihydroxy compound with a diaryl carbonate and a phosphonic acid diaryl ester in the presence of a basic polycondensation catalyst at a temperature of from 80.degree. to 340.degree. C. and under a pressure of 600 to 0.1 mm Hg in an inert gaseous atmosphere, the molar ratio of diaryl carbonate to phosphonic diaryl ester being from 5:95 to 95:5 and the molar ratio of aromatic dihydroxy compound to the sum of diaryl carbonate and phosphonic acid diaryl ester being from 0.91:1 to 0.99:1, and following polycondensation, neutralizing said basic catalyst.