| 摘要 |
<p>In a first stage of this process an elastomer latex is prepared in aqueous emulsion in the presence of at least one ionic surface-active agent and of at least one ethylenically unsaturated monomer; then, in a second stage, at least one water-insoluble or slightly water-soluble vinyl monomer is added to the latex thus obtained and the ionic charges carried by the said latex are neutralised by adding to the mixture of latex and monomer at least one transfer agent carrying ionic charges opposite to those of the surfactant employed in the first stage, in order to carry out the transfer of the latex particles into the vinyl monomer; then, in a third stage, the aqueous phase is separated from the organic phase comprising the latex and the vinyl monomer; and, in a fourth stage, the bulk polymerisation of the organic phase is carried out so as to obtain the cast plate after cooling and demoulding.</p> |
