Patent GB-1229841-A (GB)
IPC: D01D5/28
Filed: 1968-03-11
Abstract: 1,229,841. Conjugate filaments. KANEGAFUCHI BOSEKI K.K. 11 March, 1968 [15 March, 1967; 22 Nov., 1967; 20 Dec., 1967; 22 Dec., 1967 (2); 29 Dec., 1967; 19 Jan., 1968; 13 Feb., 1968], No. 11695/68. Heading B5B. A mixed filament comprises at least two components extending substantially continuously along the filament axis and forming at least ten distorted layers in an arbitrary cross-section of the filament. Longitudinal sections of such filaments are shown in Figs. 13 and 14 and typical cross-sections in Figs. 7 and 16. The layers may be divided into pieces in the crosssection and such structures, termed " archipelagic ", are shown in Figs. 8 and 17. At least twenty layers may be present and filaments having up to several hundred layers are preferred. Conjugate multi-layer filaments are shown in Figs. 18 to 21, Figs. 19 and 20 being sheathcore, and the remainder side-by-side type. In Figs. 19 and 20 the core is multi-layer, but the sheath may be multi-layer if desired, either additionally or alternatively. Such multilayer conjugate filaments may be concentric (e.g. Fig. 19) or eccentric and non-uniform (Figs. 18, 20 and 21); the latter show latent crimpability, which may be enhanced by the selection of filament components having different shrinkabilities. Further embodiments of the filament are shown in Figs. 22 and 23 (not reproduced). Multiple multi-layer structure filaments are shown in Figs. 24-27 (all double multilayer); Fig. 24 shows a cross-section having grainy layers and homogeneous layers; that of Fig. 25 consists of homogeneous layers and conjugate layers of archipelagic structure, and Fig. 27 a cross-section of micro-archipelagic structure contained in a macro-archipelagic structure. To enhance anti-static properties, surfactants may be added to the spinning composition; suitable surfactants are listed. For the method of spinning and after-treating the filaments, see divisional Specification 1,229,842 and for particulars of the apparatus used, see divisional Specification 1,229,843. Examples illustrate the melt-spinning of (1) a filament of Fig. 18 type comprising nylon-6 and polyethylene terephthalate as the two components; (2) a filament of Fig. 20 type comprising nylon-6, the components having different degrees of polymerization; (3) Fig. 18 type filaments comprising nylon-66 and pigmented nylon-6; (4) various mixed filaments comprising polyethylene terephthalate and nylon-6; (5) Fig. 18 type filaments comprising nylon-6 and a mixture of nylon-6 with magnesium lauryl phosphate as an antistatic agent; (6) the wet-spinning of Fig. 18 type filaments from a solution of polyacrylonitrile in dimethylformamide as one component, and a solution of an 85 : 15 acrylonitrile-vinyl acetate copolymer in dimethylformamide as the other component, spinning being effected into a water-dimethyl formamide bath; the melt spinning of (7) nylon-6I-nylon 6 multi-layer filaments of eccentric and non-uniform structure; (8) that of polethylene terephthalatenylon-6 filaments; (9) Fig. 22 type filaments comprising nylon-6 containing titanium oxide delustrant as component (A), nylon-6 containing no delustrant as component (B) and nylon-6I containing no delustrant as component (C); (10) Polyethylene terephthalate-nylon-6 filaments of archipelagic and substantially uniform structure; and (11) filaments comprising, as one component, #-caprolactam containing magnesium lauryl phosphate as antistatic agent, and, as the other component, nylon-6; and (12) illustrates the spinning of filaments comprising nylon-6 as one component and nylon-6 containing a small proportion of polyoxyethylene as the other component. Filaments so made may be drawn at draw ratios of 3À4 : 1 to 3À9 : 1 at from ambient temperature to 100‹ C. and may be heat-set at 120‹ to 140‹ C.