Abstract:
A stretched polyamide-6-filament consisting of a polyamide-6, having a monoclinic structure, a Cu-K -X-ray reflection width measured in the half height of the equator reflection - of at least 2.35* corresponding to an angular distance of the (200) and (020) reflex of 0.8* and an infra-red extinction ratio E833/E1075 of 13. The polyamide-6-filament is prepared by a continuous spinning and stretching process which comprises the following steps : (a) dressing the filaments spun from the polyamide-6 melt immediately after they have been cooled with a non-ionic, high temperature resistant dressing agent, (b) drawing off under transposition, (c) stretching the filaments over stretching rollers, and (d) winding up the stretched filaments under tension.
Abstract:
1,080,610. Polyurethane filaments. FARBENFABRIKEN BAYER A.G. Dec. 8, 1965 [Dec. 10, 1964], No. 52119/65. Heading B5B. A process for the production of a fast dyed, elastic filament made from a high molecular weight, segmented polyurethane comprises adding an acid or basic dyestuff to a solution of a segmented polyurethane containing acid or basic groups, especially tertiary amino and/or disulphonic acid or disulphimide groups, in an organic solvent, mixing the solution with the dyestuff and subsequently spinning said solution to form the fast dyed filament. The dyestuff may be added to the solution in a proportion of 0À1 to 10% by weight, especially 0À3 to 6%, based on the fibre forming polymer. Specified organic solvents include dimethyl formamide, dimethyl acetamide and dimethyl sulphoxide. Examples are given in which the spinning solution is spun by a dry spinning method to form the dyed filaments.
Abstract:
Acrylonitrile polymers containing at least 80% by weight of acrylonitrile units are plasticized with 1 to 20% by weight of polymer of a plasticizer comprising an aryl ester of a C6-C18 aliphatic sulphonic acid or a mixture of a dialkyl phthalate having 1 to 4 carbon atoms in each alkyl group and either an aryl ester of an aliphatic sulphonic acid or a polyester derived from adipic acid and a diol (e.g. a C2-C8 aliphatic diol). The polymer may be a homopolymer or a copolymer, e.g. with methyl acrylate. The plasticized polymers are processed to form filaments, fibres or films. The plasticizer may be added to a solution of the polymer in a solvent such as dimethyl formamide, dimethyl acetamide or dimethyl sulphone, from which the shaped products can then be formed; or the plasticizer may be admixed with the polymer before dissolution.
Abstract:
1,103,317. Making polyamide composite filaments. FARBENFABRIKEN BAYER A.G. 13 May, 1965 [15 May, 1964; 7 Jan., 1965], No. 20267/65. Heading B5B. Crimped conjugate bicomponent polyamide filaments consisting of two components which are bonded together along the whole length of the filament in side-by-side relationship are produced by melt-spinning a modified polyamide containing 0À5 to 20% of a modifying sulphonic acid segment having the general formula wherein R 11 is a -(CH 2 ) x - group, x and y each represent an integer from 2 to 12, R and R 1 each represent a hydrogen atom or a group -(CH 2 ) z -SO 3 Me, in which z represents an integer from 4 to 6 and Me represents an alkali metal or hydrogen, the group -(CH 2 ) z -SO 3 Me, being present at least once in the segment, and a polyamide which does not contain sulphonic acid groups, the two types of polyamide being extruded into air through a common spinneret orifice to form the composite filament at a temperature between 250‹ and 300‹ C., the filament thus formed being stretched at room temperature or at a higher temperature and treated with water at a temperature between 60‹ and 120‹ C. The process may be modified in that the symbol R 11 in the above general formula represents a cyclohexylene group or a group having the formula The ratios by weight between the two components of the composite filaments are advantageously between 5: 1 and 1: 5. The stretching step may be effected at a temperature between 20‹ and 140‹ C. In an example, an unmodified poly-#-aminocaproic acid and a modified poly-#- aminocaproic acid containing 5% by weight of the structural unit are simultaneously melt spun at 280‹ C. into air at 25‹ C. in such a manner that the rates of supply by weight of the polymers to each of the orifices of the spinneret are equal, the composite filaments thus produced are stretched at a stretch ratio of 3À5: 1 at 80‹ C. and thereafter treated with water at 90‹ C. and dried while in the relaxed state.