| 摘要 |
<p>1338465 Porous nylon-4 ALRAC CORP 2 Sept 1971 [3 Sept 1970] 41018/71 Heading C3C [Also in Divisions B5 D2 and H1] A nylon-4 (i.e. poly-2-pyrrolidone) sponge is made by drying a mass of water-swollen nylon-4 particles under low pressure on a screen at a temperature of about 140‹ C. The nylon-4 particles may be in the form of fibres which may be drawn, and the sponge may also contain wood pulp fibre nylon-6, TiO 2 , cotton linters, polyester fibre, rayon fibre.</p> |
