| 摘要 |
1,203,910. Composite acrylic filaments. ASAHI KASEI KOGYO K.K. 6 May, 1969 [8 May, 1968], No. 22959/69. Heading B5B. Composite bi-component filaments having an eccentric sheath-core or a side-by-side arrangement are made by conjugate wet-spinning, from a nitric acid type solvent, a first fibre component comprising a polymer C which is a mixture of (1) a copolymer A consisting essentially of acrylonitrile, methyl acrylate or methacrylate and methallyl sulphonic acid which satisfies the inequalities; v+2Àlw 18À23 < 0; v+w-7À95 > 0; v+0À02w-0À55 > 0 and v+ 0À01w - 0À674 < 0, wherein v is the per cent by wt. of methallyl sulphonic acid and w the per cent by wt. of the acrylate component and (2) a copolymer B consisting essentially of the above polymers and acrylamide and which satisfies the inequalities (*); x+1À75y- 19À45 < 0; x+ 3À3y - 28À63 > 0; x - 0À0208y - 0À4288 > 0; x +0À013y - 0À6904 < 0; t+u=y; u # 2 and x # v, wherein x is the per cent by wt. of methallyl sulphonic acid, u the per cent by wt. of acrylamide and t the per cent by wt. of the acrylate component, the copolymer C containing 25-75% by wt. of copolymer A and also satisfying inequalities (*) above, and a second fibreforming component comprising copolymer A. The spinning solvent and coagulant may be aq. HNO 3 , free of HNO 2 , and of 66-75% and 28-40% concn. respectively. The spun filaments may be washed, drawn, dried, heattreated at 100-150‹ C., further drawn and finally heat-relaxed to crimp them. A spinneret comprises a chamber (8, 9) above each orifice (10, 11) which receives the two polymer components from separate inlets (4, 5, 6, 7) and combines them for spinning. |
