| 摘要 |
<p>Compsns. for colouring polyvinyl chloride (PVC) prior to extrusion or injection moulding comprise at least 40 (esp.75) wt.% pigment and not more than 60 (esp. 25) wt.% glycerol monostearate (GMS). The compsns. are pref. used in an amt. such that the finished PVC article contains not more than 5 (esp. 3-4) wt.% GMS. The GMS acts both as a lubricant and a wetting agent for the pigment, giving non-dusting compsns. which can be blended at relatively low temps..</p> |
