| 摘要 |
1. Use of an amphoteric surfactant having the general formula RNA(CnH2nNA)x-lA (I) where R represents a hydrogen or an alifatic group with 1-24 carbon atoms, each A represents hydrogen, an alifatic group with 1-24 carbon atoms or a BOOCCmH2m-group, where m is a number from 1-3, B is hydrogen or a salt-forming cation, n is a number from 2 to 3, x is 1-8, and the number of BOOCCmH2m-groups are from 1 to x+2, with the provision that the total number of carbon atoms in the aliphatic groups is from 8 to 45, as a viscose spin bath additive. 2. Use according to Claim 1, wherein the bath contains from 5 to 15% by weight of H2SO4, from 15 to 30% by weight of Na2SO4 and from 0 to 7% by weight of ZnSO4. 3. Use according to Claim 1 or 2 wherein the amphoteric surfactant is present in an amount of from 0.5 to 5000 ppm in the spin bath. 4. Use according to Claim 1, 2 or 3 wherein the amphoteric surfactant has the formula RNA(C3H6NA1)x-lA1 (II) where R, A and x have the meaning mentioned in formula I, and A1 is a hydrogen or the group BOOCCmH2m, where B and m has the meaning mentioned in formula I. 5.A process for regeneration of cellulose from a viscose solution in a spin bath characterized in that the viscose solution is brought in contact with a spin bath containing from 0.5 to 5000 ppm of an amphoteric surfactant having the formula I defined in Claim 1. 6. A process according to Claim 5 characterized in that the spin bath solution contains from 5 to 15% by weight of H2SO4, from 15 to 30% by weight of Na2SO4 and from 0-7% by weight of ZnSO4. 9. A process according to Claim 5 or 6, characterized in that the amphoteric surfactant has the formula RNA(C3H6NA1)x-lA1 (II) where R, A and x have the meaning mentioned in formula I, and A1 is a hydrogen or the group BOOCCmH2m, where B and m has the meaning mentioned in formula I. |
