FIELD: chemical industry, production of industrial rubber. SUBSTANCE: anisotropic solution for preparing thread contains 10-25 mass of aromatic copolymer having structure 
where n=0.02-0.2, m+n=1,0 or structure 
where n= 0.02-0.2, m=0.8-0.2, n+m+l=1,0, 
; 
; 
; 
R is Cl or H, Y is O, S, NH, R′ is alkyl, alkoxy radicals having C4, haloid or hydrogen; and sulfuric acid having high concentration. Linear density thus prepared thread is not less 25.4 tex, its oxygen index is 40-60 tensile strength being not less 190 gf/tex. EFFECT: improves quality of desired product. 3 cl, 9 tbl
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