| 摘要 |
<p>1,241,709. Stabilizing polyolefins. WESTERN ELECTRIC CO. Inc. 11 Dec., 1968 [14 Dec., 1967], No. 58797/68. Heading C3P. Normally solid polyolefins are stabilized with 0À05 to 5 weight per cent of a compound of formula where R is H or OH, R<SP>1</SP> is NH, CO or CH and R<SP>11</SP> is CH 2 , CH or CO. Specified polymers are of ethylene, propylene, 4-methylpentene-1, 4,4- dimethylpentene - 1, dodecene - 1, 3 - methylbutene-1, butene and pentene-1. In examples polyethylene and polypropylene are stabilized with 5-hydroxy indole, 5-hydroxy oxindole, 3- indazolinone, phenol and 4,4<SP>1</SP>-thio bis(3-methyl- 6-t.-butylphenol).</p> |
