Chemistry of carbon compounds – Miscellaneous organic carbon compounds
Patent
1975-03-03
1976-08-03
Hoke, V. P.
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
260 457P, 260 4585B, 260 4585H, 260 4585S, 260 4595H, 260 4595R, C08J 320
Patent
active
039728544
ABSTRACT:
Control of Hunter A and B color values of fiber-grade polypropylene compositions having a stabilizer additive system therein is achieved by processing the polypropylene and additive system in an atmosphere having an oxygen content in the range of 0.1 to 5.0 volume percent. Desired color of the processed polymeric composition is maintained by monitoring the color of the pelleted product and, responsive thereto, controlling oxygen content of the mixer atmosphere or by measuring the oxygen content of the atmosphere of the mixer and maintaining same within a predetermined concentration whereby the color of the pellets is maintained within a predetermined range.
REFERENCES:
patent: 3793290 (1974-02-01), Dix et al.
Crystalline Olefin Polymers -- Part II, Raff et al., (1965), pp. 371-373, 395, 396.
Journal of Polymer Science -- vol. XXIV, No. 105, 1957 -- pp. 138 and 139.
Hoke V. P.
Phillips Petroleum Company
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