Patent GB-1153940-A (GB)
Title: A method of producing Polyamide Composite Filaments having a Latent Highly Elastic and Highly Recoverable Crimp
IPC: D01F8/12
Filed: 1967-10-27
Abstract: 1,153,940. Polyamide composite filaments having a latent crimp. KANEGAFUCHI BOSEKI K.K. and SNIA VISCOSA SOC. NAZIONALE INDUSTRIA APPLICAZIONI VISCOSA S.p.A. 27 Oct., 1967 [1 Nov., 1966], No. 49012/67. Heading B5B. [Also in Division C3] A drawn composite filament having the ability to develop elasticity and crimp-recoverability on being given a crimp-developing treatment and consisting of two components bonded together along their length in either side-by-side or eccentric sheath-core disposition is formed by melt spinning simultaneously through an orifice of a spinneret a homopolyamide and a copolyesteramide. The latter component is obtained by copolymerizing a polyamide with 0À1 to 20% by weight, based on the weight of the polyamide, of a mixture of a lactone having the general formula wherein R 1  represents a saturated aliphatic hydrocarbon radical having 4 to 7 carbon atoms, an #-aminoalcohol having the general formula NH 2 R 2 OH wherein R 2  is a saturated aliphatic hydrocarbon radical, an aromatic nucleus or an alicyclic nucleus having 2 to 15 carbon atoms, and a dibasic acid (or its mono- or diester) having the general formula R 3 OOCR 4 COOR 5  wherein R 3  and R 5  are hydrogen atoms or hydrocarbon radicals having 1 to 5 carbon atoms and R 4  is a saturated aliphatic hydrocarbon radical, aromatic nucleus or alicyclic nucleus having 1 to 12 carbon atoms, in a mole ratio of 1:1:1, or a mixture of the above-defined lactone, a diamine having the general formula NH 2 R 6 NH 2  wherein R 6  is a saturated aliphatic hydrocarbon radical, an aromatic nucleus, an alicyclic ring or a piperazine ring having 2 to 12 carbon atoms, and the above defined dibasic acid (or its mono- or diester) in a mole ratio of 2: 1: 1 or a mixture of the above-defined lactone, the above defined #-aminoalcohol and the above-defined dibasic acid or derivatives thereof with a mixture of the lactone, the abovedefined diamine and the dibasic acid or derivative thereof. The conjugate filaments obtained are drawn and thereafter subjected to treatment to cause them to shrink and develop helical crimps such as a swelling treatment by contacting with boiling water or otherwise heating. The homopolyamide used may be poly-#-caprolactam, polyhexamethyleneadipamide, polyhexamethylene sebacamide, polyenantholactam, poly - # - aminoundecylic acid, poly- # - aminolauric acid, polymetaxylylene - adipamide, polymetaxylylene - decamethylenedicarbonamide, polyparaxylyleneadipamide, or polyundecamethyleneterephthalamide. The lactone may be butyro -, capro, enantho - or capryllactone. The # - aminoalcohol may be ethanolamines # - aminobutanol, - pentanol, - hexanol, or - decanol, p - aminobenzyl alcohol, 4 - aminocyclohexanol. The dibasic acid or the esters thereof may be malonic acid, succinic acid, suberic acid, azelaic acid, sebacic acid, undecamethylene dicarboxylic acid, terephthalic acid, isophthalic acid, hexahydroterephthalic acid, p,p1 - diphenyl dicarboxylic acid, p,p<SP>1</SP>-diphenyl -methane dicarboxylic acid, or mono- and di-ethyl, methyl propyl and amyl esters of these acids. The diamine may be ethylene-, hexamethylene-, nonamethylene -, decamethylene -, m - xylylene - or p-xylylenadiamine or piperazine.