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.
摘要:
The invention relates to a process for the production of carboxylic acid esters from carboxylic acids and alcohols which is characterized in that neutral phosphites containing oxetane groups are used as esterification catalysts.
摘要:
The present invention provides polycarbonate moulding compositions containing polycarbonates, stabilisers of the general formula (I)R.sub.1 --X--(CHR.sub.4).sub.n --Y--R.sub.2and optionally polypropylene glycols.The present invention also provides use of these moulding compositions for preparing items for medical applications.
摘要:
The present invention provides polycarbonate moulding compositions containing polycarbonates, stabilisers of the general formula (I) R.sub.1 --X--(CHR.sub.4).sub.n --Y--R.sub.2, where X and Y, are either ##STR1## , and Y may also be --S--, and optionally polypropylene glycols. The present invention also provides use of these moulding compositions for preparing items for medical applications.
摘要:
The invention relates to a process for the synthesis of bis-(4-hydroxyphenyl)-alkanes on ion-exchange resins or mixtures of ion-exchange resins which are modified with alkyl-SH groups, wherein the monophenols and carbonyl compounds to be used have first been purified to remove substances which can transfer alkyl groups.
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.