Process to minimize yellowness in articles formed from...

Details Process to minimize yellowness in articles formed from... Process to minimize yellowness in articles formed from...

C - Chemistry, Metallurgy

08

L

18/1216, 400/305

C08L 25/12 (2006.01) C08F 6/22 (2006.01) C08F 279/04 (2006.01) C08J 3/00 (2006.01) C08J 3/16 (2006.01) C08J 5/00 (2006.01) C08L 33/20 (2006.01)

Patent

CA 1049680

Abstract The development of yellowness in an article formed from an acrylonitrile-styrene (or styrene derivative) poly- mer composition is minimized by 1) coagulation of the polymer in a pH environment of 6.0 to 7.5; and 2) melt processing of the polymer composition (at a temperature of 200°C. to 260°C.) with moisture controlled in the composition either a) in an initial range Or 0.2 to 1.5 weight percent and a final range of 0.15 to 0.4 weight percent immediately prior to solidification in equipment that provides extraction of volatiles during processing, or b) in the range of 0.15 to 0.4 weight percent in equipment that does not provide extraction Or volatiles. The formed article which is essentially free of bubbles is useful where barrier properties to oxygen or carbon dioxide are desirable, e.g., bottles for holding carbonated beverages.

225886

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