Production of an improved non-reinforced polyoxymethylene...

Details Production of an improved non-reinforced polyoxymethylene... Production of an improved non-reinforced polyoxymethylene...

C - Chemistry, Metallurgy

08

L

400/5479

C08L 59/00 (2006.01) C08G 2/30 (2006.01) C08G 18/00 (2006.01) C08L 59/02 (2006.01) C08L 79/00 (2006.01)

Patent

CA 1101584

PRODUCTION OF AN IMPROVED NON-REINFORCED POLYOXYMETHYLENE MOLDING COMPOSITION WHICH FORMS REDUCED MOLD DEPOSITS UPON MOLDING ABSTRACT OF THE DISCLOSURE The mold deposit problem commonly associated with non-reinforced polyoxymethylene molding compositions which creates a non-uniform surface on a molded article effectively is minimized. The polyoxymethylene polymer ini- tially is heated (as described) while in admixture with about 0.25 to about 3 percent by weight based upon the weight of the polyoxymethylene polymer of a certain polycarbodiimide. The polycarbodiimide contains at least three carbodiimide units per polycarbodiimide molecule and is derived from one or more aromatic diisocyanates which are unsubstituted or are substituted with up to one methyl substituent on each aromatic ring.

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