摘要:
The present invention provides flame-resistant polycarbonate moulding compositions with a concentration of alkali metal or alkaline earth metal salts and of silicon compounds and their preparation.
摘要:
The invention relates to a process and an apparatus for the identification of the tin and firing sides of float glass, in particular during an automated production process, whereby a property of the float glass, in particular an optical property, differentiating the tin side and the firing side is determined by measuring techniques from the direction of one of the two sides or on one of the two sides, and a measured value resulting thereform is compared with a predetermined reference value, whereby the tin side and the firing side of the float glass are determined from the result of the comparison.
摘要:
This invention relates to halogen-free binary mixtures of two fully aromatic polycarbonates each having a disperse solubility of from 18 to 35 (J/ccm).sup.1/2, in which both polycarbonates are of high molecular weight and each contains not more than 70 mol-% of bisphenol A. The invention further relates to the use of these mixtures for optical data stores and to moulded parts produced from the mixtures.
摘要:
The invention relates to a process for the production of bisphenols from acetone and phenols in the presence of sulfonic acid ion exchanger resins modified with alkyl-SH groups, in which 0.6 to 5% by weight H.sub.2 O is added to the mixture of phenol and acetone before the reaction.
摘要翻译:本发明涉及一种在烷基-SH基团改性的磺酸离子交换树脂存在下由丙酮和酚生产双酚的方法,其中在苯酚和丙酮的混合物中加入0.6-5重量%的H 2 O. 反应。
摘要:
The invention relates to the use of mixtures consisting of 5 to 95% by weight of an aromatic polycarbonate of which the linear chains contain from 0.1 mol-% to 50 mol-% bifunctional structural units corresponding to formula (1) ##STR1## and 95 to 5% by weight of a thermoplastic styrene polymer and, optionally, standard additives as substrates for optical storage media.
摘要:
The present invention relates to a process for the manufacture of bis(4-hydroxyaryl)alkanes by heterogeneous acid-catalyzed reaction of aromatic hydroxy compounds with ketones in reactors connected in series, which in the direction of advancing conversion are operated with rising temperature and optionally with increasing loading.
摘要:
The invention relates to the use of the diphenol corresponding to formula (I) ##STR1## for the production of high molecular weight, thermoplastic, aromataic polycarbonates, to a process for the production of these polycarbonates and to the new thermoplastic having improved heat resistance obtainable by the process.
摘要:
The invention relates to the use of thermoplastic homopolycarbonates of 3,3'-dihydroxydiphenyl ether in quantities of 3% by weight to 30% by weight for modifying filsm of other thermoplastics than the thermoplastic homopolycarbonates of 3,3'-dihydroxydiphenyl ether, to a process for modifying films of these other thermoplastics, to the films obtainable by this process and to mixtures containing the homopolycarbonates mentioned and the other thermoplastics.
摘要:
The present invention provides a process for the production of high purity bisphenol A by special in-process-crystallisation of bisphenol A/phenol adduct crystallisates.