Abstract A stable solution adapted to form filaments by dry-spinning and a dry-spinning process utilizing such a stable solution are disclosed. The stable solution contains from about 70 to about 82 percent by weight of methylene chloride and about 30 to about 18 percent by weight of the solution of a polymer of the recurring structural formula: WHEREIN R and R'' may be the same or different and represent lower alkyl groups or hydrogen or may, together, constitute a cyclic hydrocarbon group; and Ar is a mixture of from about 20 to about 40 percent paraphenylene and from about 80 to about 60 percent metaphenylene. The solution is stable for at least 24 hours between its formation and time of spinning and may be dryspun into filaments at relatively low temperatures.
AN IMPROVED DRY-SPINNING PROCESS FOR FORMING AROMATIC POLYESTER FILAMENTS WHICH COMPRISES EXTRUDING A STABLE SOLUTION CONSISTING ESSENTIALLY OF FROM ABOUT 70 TO 82 PERCENT BY WEIGHT OF THE SOLUTION OF METHYLENE CHLORIDE; AND FROM ABOUT 30 TO 18 PERCENT BY WEIGHT OF THE SOLUTION OF POLYMER HAVING A RECURRING STRUCTURAL FORMULA:
Claim 2
Dependent Claim
51 words
AN IMPROVED DRY-SPINNING PROCESS FOR FORMING AROMATIC POLYESTER FILAMENTS WHICH COMPRISES EXTRUDING A STABLE SOLUTION CONSISTING ESSENTIALLY OF FROM ABOUT 70 TO 82 PERCENT BY WEIGHT OF THE SOLUTION OF METHYLENE CHLORIDE; AND FROM ABOUT 30 TO 18 PERCENT BY WEIGHT OF THE SOLUTION OF POLYMER HAVING A RECURRING STRUCTURAL FORMULA:
Claim 3
Dependent Claim
26 words
The process of claim 1 wherein said stable solution is extruded into an atmosphere of air having a temperature of from about 30* to about 85*C.
Claim 4
Dependent Claim
34 words
The process of claim 2 wherein said stable solution is extruded through a multi-hole spinning jet in which each hole has a diameter of about 30 to about 60 microns into a spinning column.
Claim 5
Dependent Claim
46 words
The process of claim 3 wherein said spinning jet has a face temperature of from about 30* to about 85*C., the column has a temperature near the top of about 30* to about 82*C. and a temperature near the bottom of about 30* to about 75*C.
Claim 6
Dependent Claim
25 words
The process of claim 4 wherein said formed filament is taken up at a speed of from about 10 to about 500 meters per minute.
Claim 7
Dependent Claim
81 words
The process of claim 5 wherein said stable solution which is extruded consists essentially of from about 76 to 78 percent by weight of methylene chloride and about 24 to about 22 percent by weight of the said polymer in which R and R'' are each a methyl group, Ar is a mixture of about 30 percent by weight of paraphenylene and about 70 percent by weight of metaphenylene, said solution having a viscosity of about 1200 to about 1800 poises.