C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
403/8
C08L 59/00 (2006.01) C08J 11/06 (2006.01)
Patent
CA 1091398
ABSTRACT OF THE DISCLOSURE Polyacetal scrap materials may be reclaimed and degradation of the polymer and undesirable loss of elongation avoided, by intimately admixing with the material about 2% by weight of a polysiloxane fluid. Polyacetal resins such as may be prepared by polymeriz- ation of formaldehyde with from 0.1 to 15 mol. % of a cyclic ether, i.e. ethylene oxide, after reduction by usual machining processes to scrap, may be coarsely ground to between 1/8 and 3/16 inch in greatest dimension, mixed with a silicone fluid, and extruded as by a Werner-Pfleiderer or other extruder at operating temperature of extrusion die about 205°C to form strands; these are immediately cooled in water, chopped and dried to form molding stock. An optimum proportion of a polysiloxane fluid which preserves elongation up to 56% and tensile strength nearly 8,000 psi is 2%; a lesser proportion preserves higher strength but lowers elongation, and higher proportions lower both tensile strength and elongation. One suitable polysiloxane has a viscosity about 30,000 centistokes.
292239
Hanley Michael A.
Kinsey Irvin H.
Miller Lawrence A.
Filipkowski R.j.
Polymer Corporation (the)
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