Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Treating polymer containing material or treating a solid...
Patent
1995-01-19
1995-08-15
Foelak, Morton
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Treating polymer containing material or treating a solid...
264101, 521 79, 521 92, 521 97, 528480, 528488, C08F 600
Patent
active
054420415
ABSTRACT:
A thermoplastic resin such as a styrene/maleic anhydride copolymer is treated to remove volatile impurities such as unreacted styrene by admixing with a chemical blowing agent and extruding under a vacuum. The chemical blowing agent is converted into an inert gas such as carbon dioxide during extrusion; the gas evolved is removed, together with the volatile impurities, through one or more vents in the extruder. The use of a chemical blowing agent, rather than the inert gas itself, permits the facile distribution of the CO.sub.2 stripping agent throughout the molten thermoplastic resin using commonly available extruders without the need for elaborate gas injection means.
REFERENCES:
patent: 4588754 (1986-05-01), Liu
patent: 4695594 (1987-09-01), Pressman
patent: 4703105 (1987-10-01), Allada
patent: 4940472 (1990-07-01), Hay, II et al.
patent: 4952672 (1990-08-01), Moore et al.
patent: 4994217 (1991-02-01), Banevicius et al.
patent: 5102591 (1992-04-01), Hasson et al.
patent: 5204410 (1993-04-01), Banevicius et al.
Heck et al., "Blowing Agents," Encyclopedia of Polymer Science & Technology vol. 2, pp. 438-443.
Hurnick "Chemical Blowing Agents", Plastics Additives Handbook, 3rd Edition, Chapter 16, pp. 811-832 (1990).
"Update: Blowing Agents", Plastics Compounding, pp. 64-72, (1980).
Cleland William J.
Mallikarjun Ramesh
Otte Leon L.
Arco Chemical Technology L.P.
Foelak Morton
Harper Stephen D.
LandOfFree
Removal of volatile substances from thermoplastic resins does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Removal of volatile substances from thermoplastic resins, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Removal of volatile substances from thermoplastic resins will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2182549