| 摘要 |
<p>The process comprises dehydration of alpha-hydroxycarboxylic acid, purified or otherwise, or its esters in a solvent such as an alcohol or an alcohol mixture in the presence of water, in the presence of a polymerisation inhibitor and carrier gas. The dehydration takes place on a support consisting of insoluble phosphates etc. of elements of Gps. II, IIIa, IVb, VIII and/or the iron gp. of the Periodic Table. - The cpds. are used as monomers for polymers prodn.</p> |
