High bulk density rigid poly(vinyl chloride) resin powder compos

Details High bulk density rigid poly(vinyl chloride) resin powder compos High bulk density rigid poly(vinyl chloride) resin powder compos

1979-06-27

1980-12-16

Marquis, Melvyn I.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

260 23XA, 260 23R, 260 285C, 260 4244, 260 4575S, C08K 326

Patent

active

042396794

ABSTRACT:
Completely free flow characteristics are provided to a densified rigid poly(vinyl chloride) resin powder composition as prepared in a high shear mixer at an elevated temperature, by withholding at least a portion of the total filler requirement from the composition during the initial mixing cycle, and thereafter adding the remainder of the filler requirement to the composition after it has been cooled to a temperature of 175.degree. F. or less. The total filler requirement of the composition may likewise be added after cooling the blend to 175.degree. F. or less. The resulting rigid resin powder composition exhibits the optimum free flow characteristics required for satisfactory processing in multi-screw extruders.

REFERENCES:
patent: 3567669 (1971-03-01), Georgiana et al.
patent: 3775359 (1973-11-01), Georgiana et al.

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