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US 5,204,410 AGranted
Method for removing volatile substances from polyphenylene ether or polyphenylene ether/styrene resin compositions
AssigneeGeneral Electric Company
InventorsJohn P. Banevicius, Alexandros Hasson, William E. Pecak
Life of this patent
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Abstract
Volatile substances in polyphenylene ether or polyphenylene ether/polystyrene compositions are substantially reduced by extruding the resins in a single pass using a plurality of stages comprising water injection and vacuum venting.
Claims7
A low odor polyphenylene ether or polyphenylene ether/polystyrene pellet which contains less than about 5 parts per million of 2,4,6-trimethylanisole, produced by a process which comprises extruding a composition which itself comprises:
- a) a polyphenylene ether resin having sources of odoriferous amine content of greater than about 10,000 parts per million based on said resin;
- alone, or in combination with
- b) a styrene resin;
- said extrusion being carried out at a temperature above the melting point of the composition, in one pass in at least two stages, each stage comprising water injection followed by vacuum venting, the total amount of water being divided between said stages and comprising up to about 15% by weight of said composition;
- and then shaping the low odor composition into a pellet.
2 more elements
Dependencies are inferred from the claim text.