Polyacrylonitrile hollow threads

Details Polyacrylonitrile hollow threads Polyacrylonitrile hollow threads

C - Chemistry, Metallurgy

08

J

18/27

C08J 9/28 (2006.01) B01D 69/08 (2006.01) B01D 71/42 (2006.01) D01D 5/06 (2006.01) D01D 5/24 (2006.01)

Patent

CA 2038964

BAYER AKTIENGESELLSCHAFT 5090 Leverkusen, Bayerwerk Konzernverwaltung RP Patente Konzern Oer/K? Polyacrylonitrile hollow threads A b s t r a c t Improved hollow threads of polyacrylonitrile, for use in membranes, (for ultra- and microfiltration) with an asymmetric pore structure of the jacket are characterised in that the polyacrylonitrile is a homo- polymer and in that the pore structure of the wet hollow thread produced immediately after spinning is fixed in a frozen state (by a treatment in the last step with alcohols and drying). The process for production of the hollow threads with a stable, asymmetric pore structure preferably is a dry-wet-spinning process with glycerine-based core liquids, definite draw and after treatment conditions and (in the last step of fiber preparation) a treatment with alcohols and drying. Le A 27 634 -foreign-countries

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