| 摘要 |
<p>This is carried out by addition of 0.005-1 wt.% pref. 0.01-0.1 wt.% of cpds. with at least two hyroxyl gps. which may be etherified or esterified e.g. dihydroxy aliphatic alcohols partic. ethylene glycol, 1,2-or 1,3-propanediol, 1,2-, 1,3- or 1,4-butanediol or 2,3-butanediol.</p> |
