buckles 23 for household articles such as e g kitchen sinks and letter box housings 26 transparent washing machine portholes with improved resistance to the wash solution 28 lamp covers for kitchen equipment with improved resistance to kitchen vapour in particular oil vapours 31 for other uses such as e g feed stable doors or animal cages the following examples are intended to illustrate the present invention but without limiting it via a t piece before the pump 24 000 kg h of an alkaline bisphenol a solution which contains 15 wt bpa and 2 1 mol of sodium hydroxide solution per mol of bpa and via a further t piece 1 840 kg h of phosgene dissolved in 21 000 kg h of solvent which consists of 50 wt methylene chloride and 50 wt monochlorobenzene are metered into a loop reactor to maintain the alkalinity 348 kg h of 32 sodium hydroxide solution are metered in and the reaction mixture is passed back to the pump via the heat exchanger and the residence tank the above substance streams being metered in a part amount of the emulsion which is as high as that of the raw materials flowing in is fed before the metering points for bpa and phosgene from the residence tank to a further pump and pumped through a tube reactor 1 064 kg h of sodium hydroxide solution 32 wt and 703 kg h of a solution 20 wt of p.