| 摘要 |
<p>1,274,347. Polymerizing tetrahydrofuran. KAO SOAP CO. Ltd. 3 March, 1970 [3 March, 1969], No.10120/70. Heading C3R. Tetrahydrofuran is polymerized in the presence of fuming sulphuric acid containing 15 to 43 wt. per cent of free sulphur trioxide. There may be from 10 to 40 parts by weight of fuming sulphuric acid present per 100 parts by weight of tetrahydrofuran. The polymerization is carried out at -40‹ to 100‹ C., with or without a solvent. Examples are given.</p> |
