| 摘要 |
<p>Moulding compound for gramophone records mfe. Compounds based on vinyl chlorie/vinyl acetate copolymers contain 2 to 30 wt.% vinyl chloride/fumaric acid diester copolymer and/or vinyl chloride/maleic acid diester copolymer or corresponding copolymer. Usual additives may be present. Cpds. are easily compounded and homogenised even on relatively weakly compounding machines e.g. single-screw extruders. Used in mfe of high quality gramophone records.</p> |
