| 摘要 |
<p>1305420 Polypropylene filaments ETHICON Inc 30 July 1970 [31 July 1969] 36934/70 Heading B5B Isotactic polypropylene sutures have a diameter of from 0À002 inch to 0À020 inch and the following properties: They are obtained by treating extruded filaments, prepared from polypropylene having the above molecular weight characteristics, and which may be liquid-quenched, by stretching them to about 6À6 times their original length at a temperature between 260‹ to 325‹ F., preferably 300‹ F., and then relaxing them to between 76% and 91% of their stretched length at a temperature between the same limits, preferably 300‹ F. again.</p> |
