摘要:
A thermoplastic molding composition comprising (co)poly(ester)carbonate, and a cyclic oligoformal is disclosed. The composition that is characterized in its lowered water absorption and improved flowability is suitable for a variety of application including in particular optical data storage media.
摘要:
A multi stage process for the production of polycarbonates having low monomer content is disclosed. The process entails, in sequence, (i) transesterifying in the melt at least one dihydroxyaryl compound with at least one diaryl carbonate in the presence of at least one onium catalyst to produce a polycondensate that contains monomers, (ii) introducing into the polycondensate an inhibitor in an hypostoichiometric amount in relation to the catalyst and (iii) reducing in a finishing reactor the content of monomers in said polycondensate. The polycarbonate thus produced is characterized in that it contains less than 350 ppm of diphenyl carbonate, less than 40 ppm of 2,2-bis-(4-hydroxyphenyl)propane and less than 150 ppm of phenol.
摘要:
An improvement to the melt transesterification process for the preparation of polycarbonate is disclosed. The improvement entails adding to the process between its medium viscosity reactor and a high viscosity reactor at least one bridged ester of organic sulphur-containing acid.
摘要:
A branched (co)polyformal is disclosed. The (co)polyformal contains structural units conforming to at least one the general formulae (1a) and (1b) wherein each of -E- and -D- independently of one another denote an aromatic radical having 6 to 40 C atoms, k is 1 to 4,000, o is 1 to 4,000, m is z/o and n is (o-z)/o, where z is 0 to o. The branched (co)polyformal is characterized by its reduced water uptake and improved hydrolytic stability. Also disclosed are processes for its preparation and use in the production of molded articles.
摘要:
A branched polycarbonate and processes for its preparation are disclosed. The polycarbonate contains structural units conforming to in which R1, R2, R3 and R4 mutually independently denote C1-C10 alkyl, R5, R6 and R7 mutually independently denote hydrogen or C1-C10 alkyl, or R1 and R2, and R3 and R4, with the carbon atom to which they are attached, form a C5-C10 cycloalkyl group, wherein the cycloalkyl group may be substituted.
摘要:
A process of using of a particularly substituted phenol as a chain terminator of a polymeric resin is disclosed. The chain terminator is a member selected from among ortho-substituted phenol, metha-substituted phenol, and their corresponding coupled esters. The polymeric resin is selected among polycarbonate, polyester carbonate and polyester. The thus chain terminated resin is suitable for producing molded parts and extrudates. Also disclosed are the process for producing these polymers and processes for producing the molded parts and extrudates.
摘要:
A thermoplastic molding composition comprising polycarbonate and at least one aromatic formal is disclosed. The formal conforms to The composition that is characterized by its reduced water uptake, is useful especially for the production of optical data carriers, such as compact discs.
摘要:
The invention relates to layer arrangement having (i) at least one transparent substrate containing an electrically conductive layer, (ii) an electro-optically active layer, and (iii) a further substrate containing an electrically conductive layer, wherein at least one of the two electrically conductive substrates is additionally coated with an organic conductive polymer system and the electro-optically active layer contains an electrophosphorescent compound.
摘要:
A branched (co)polyformal is disclosed. The (co)polyformal contains structural units conforming to at least one the general formulae (1a) and (1b) wherein each of -E- and -D- independently of one another denote an aromatic radical having 6 to 40 C atoms, k is 1 to 4,000, o is 1 to 4,000, m is z/o and n is (o-z)/o, where z is 0 to o. The branched (co)polyformal is characterized by its reduced water uptake and improved hydrolytic stability. Also disclosed are processes for its preparation and use in the production of molded articles.
摘要:
A multi-layer article is disclosed. The article contains a base layer that contains at least one thermoplastic resin and a second layer containing a thermoplastic (co)polyformal superimposed over the base layer. The (co)polyformal conforms to formulae (1a) or (1b), O-D-O—CH2k 1a O-D-O—CH2mOE-O—CH2no 1b in which O-D-O and O-E-O independently denote a diphenolate group, -D- and -E- independently denote an aromatic group having 6 to 40 C atoms, k is a whole number from 1 to 1500 and m is z/o and n is (o−z)/o wherein z is 0 to o. The multi-layer article that may be prepared by co-extrusion exhibits improved properties.
摘要翻译:公开了一种多层制品。 该制品包含含有至少一种热塑性树脂的基层和包含叠加在基层上的热塑性(共)聚合物的第二层。 (共)聚异构体符合式(1a)或(1b),和Brketopenst; ODO-CH2和Brketclosest; k 1a和Brketopenst;& Brketopenst; ODO-CH2和Brketclosest; mO和Brketopenst; EO-CH2和Brketclosest; n&Brketclosest; o 1b,其中ODO和OEO独立地表示 二酚酯基,-D-和-E-独立地表示具有6〜40个碳原子的芳基,k为1〜1500的整数,m为z / o,n为(盎司)/ o,其中z为0〜 o。 可以通过共挤出制备的多层制品表现出改进的性能。