摘要:
Block copolyesters based on polyalkylene terephthalates which contain polydiene blocks show an extremely low deformation even when they are processed into thin articles. They still have a crystallinity which is decreased by less than the ratio corresponding to the polydiene portion.
摘要:
Thermoplastic polyamides with improved stability against reduction in molecular weight due to the effect of light, which have maleic imides as end groups.
摘要:
This invention relates to the use of polyphenylene oxides corresponding to the following general formula: ##STR1## for the production of aromatic block polyether-poly(ester) carbonates by the interfacial process and also to the block polyether-poly(ester) carbonates obtainable by the process.
摘要:
The invention relates to a process for the production of optionally branched polyarylene sulfides by reacting dihalogen benzenes in admixture with aromatic polyhalogen compounds and alkali sulfides in polar solvents, the reaction being carried out in the presence of reducing agents.
摘要:
A block copolymer is produced fromI. 1 to 60% by weight of at least one telechelic diene polymer containing terminal carbonate ester, --OH--, --NH.sub.2 --, carboxylic acid or carboxylic acid ester groups and having a molecular weight M.sub.n of from about 400 to 1300, andII. 99 to 40% by weight of at least one polyamide or polyamide-forming component.
摘要:
Thermoplastic, branched aromatic polyphosphonates with average molecular weights (number average M.sub.n) of from 11,000 to more than 200,000, obtainable by transesterifying (a) from 97 to 100 moles of at least one diaryl phosphonate, and (b) from 0 to 3 moles of at least one triaryl phosphate--the sum of the moles of (a) and (b) being 100--with (c) from 90 to 99 moles of at least one aromatic dihydroxy compound, and (d) from 0 to 3 moles of at least one aromatic trihydroxy or tetradhydroxy compound--with the proviso that at least one of the components (b) and (d) is present in a quantity of at least 0.001 mole and that, where (b) and (d) are used, the maximum limit on the moles is 3.0.
摘要:
Diphasic mixtures obtained from the synthesis of aromatic polyesters by the diphasic interface process may be separated into an aqueous phase and an organic phase by the addition of selected compounds.
摘要:
A single-stage process for the production of pure aromatic carboxylic acid chlorides by reacting an aromatic carboxylic acid or an aromatic carboxylic acid mixture with thionylchloride in the presence of tert. phosphine as the catalyst.
摘要:
A two step catalyzed process for the preparation of thermoplastic polyphosphonatophenyl ester carbonates comprising first, the preparation of an aryloxy carbonyloxy-benzoic acid aryl ester and second, its transesterification with a phosphonic acid diphenyl ester and a diphenol is disclosed.
摘要:
Polyester phosphonates based on aromatic dicarboxylic acids and aromatic dihydroxy compounds exhibit a low flammability and surprisingly improved mechanical characteristics, particularly an excellent dimensional heat stability.