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Coated ultrafine precipitated CaCO 3 as impact modifier extender in low molecular weight PVC
Author(s) -
Mathur K.,
Rogers L.,
Tapper M.
Publication year - 1986
Publication title -
journal of vinyl technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.295
H-Index - 35
eISSN - 1548-0585
pISSN - 0193-7197
DOI - 10.1002/vnl.730080308
Subject(s) - izod impact strength test , extender , materials science , filler (materials) , composite material , molding (decorative) , ultimate tensile strength , polyurethane
Work reported earlier had shown that the addition of 0.07 micron stearate coated ultrafine precipitated CaCO 3 (CUPCC) in medium to high molecular weight PVC resulted in a significant improvement in notched Izod impact strength. The improvement was much more dramatic when the filler loading exceeded 10 phr. The addition of CUPCC to low molecular weight PVC had practically no effect on the notched Izod impact strength at equivalent loadings. More recent studies have demonstrated that when CUPCC is added to an impact modified low molecular weight PVC, it dramatically enhances the efficiency of impact modifier. This was found to be consistent with threee general classes of commercially available impact modifiers used in this study. The ability to extend the impact modifier with CUPCC in low molecular weight PVC, which has gained a wide acceptance in injection molding operations, will result in significant cost savings. The effect of CUPCC addition on other key properties and cost benefits will also be presented.