Simplified process for the production of acrylic fibers
AssigneeMontefibre Mae Technologies S.r.l.
InventorsFranco Francalanci, Massimo Marinetti, Roberto Proserpio
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Abstract
A process for the preparation of a homogeneous spinning solution for the production of acrylic fibers, which includes: preparing an aqueous suspension of homopolymer or copolymer of acrylonitrile through the polymerization of monomers in aqueous suspension, removal of the unreacted monomers, filtration and washing of the aqueous suspension, obtaining a filtration cake; dispersing the filtration cake; and evaporating the dispersion of polymer or obtaining the homogeneous spinning solution.
Claims18
A process for the preparation of a homogeneous spinning solution for the production of acrylic fibers, comprising:
- i) preparing an aqueous suspension of a homopolymer or copolymer of acrylonitrile by polymerizing monomers in an aqueous suspension, removing the unreacted monomers, filtering and washing the aqueous suspension, and obtaining a filtration cake comprising the homopolymer or copolymer of acrylonitrile and water in a ratio of from 40:60 to 60:40 by weight;
- ii) dispersing the filtration cake in a quantity of dimethyl sulfoxide (DMSO) and optionally water which varies from 2 to 6 times the weight of the filtration cake to produce a dispersion, said DMSO being at a temperature ranging from 5 to 10° C. and with the optional water being in a quantity ranging from 0 to 10% by weight with respect to the total weight of DMSO and optional water;
- iii) evaporating the dispersion obtained in step ii) at a temperature ranging from 40 to 80° C. for a time ranging from 3 to 60 minutes at a pressure ranging from 1.3 to 5.5 kPa.
Dependencies are inferred from the claim text.