| 摘要 |
1,169,469. Polyamide-polyester fibres. EASTMAN KODAK CO. 23 June, 1967 [24 June, 1966], No. 28993/67. Addition to 1,055,156. Heading B5B. [Also in Division C3] A fibre-forming composition comprises a heterogeneous mixture of a fibre-forming polyester condensate and a homopolyamide having a melt viscosity substantially equal to or less than the melt viscosity of the polyester. The polyamide may be insoluble in a water-ethanol mixture, have M.P. 160-320‹ C. and an inherent viscosity (measured at 25‹ C. in 60/40 phenol/tetrachloroethane) in the range 0À2-2À0. It may have recurring units of the formula where R, R<SP>1</SP> and R<SP>11</SP> are divalent C 1 -C 12 hydrocarbon radicals. From 1-40% by weight of the composition may be polyamide. Examples of suitable polyamides are poly (#- caprolactam), poly (hexamethylene adipamide); poly (hexamethylene sebacamide); and poly (m-xylylene sebacamide). Polyesters exemplified are : poly (ethylene terephthalate); poly (1,4 - cyclohexylenedimethylene terephthalate); poly (pentamethylene 4,4<SP>1 </SP>- sulfonyldibenzoate) and copolymers of poly (ethylene tere- and isophthalate) and poly (ethylene tere- and sulphoiso-phthalate). Synthetic fibres may be prepared by rigorously drying the two components of the composition and the apparatus in which they are to be blended. The mixture of polymers is raised to a temperature above the melt spinning temperature and left at this temperature for a period not > 1 hour. The mixture is melt spun before any substantial chemical interaction takes place. The resultant fibres have inproved dye receptivity over unmodified polyesters. |
