| abstract |
Prod. is sepd. from a reaction mixt. contg. a homogeneous catalyst system by means of a diffusion membrane, with addn. of a de-swelling agent to the reaction mixt. Pref. the membrane is of a (modified) silicone rubber, esp. where no true crystalline regions and amorphous regions can be distinguished and with no obvious pore structure, the polymer molecules being coupled by crosslinking. The material is pref. polydimethylsiloxane or a halogenated silicone rubber, esp. polytrifluoro- or polytrichloro-propyl-methylsiloxane. |