TREA

Preparation of 6-carboxy-cellulose nitrates

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Information

  • Patent Application
  • 20070203335
  • Publication Number
    20070203335
  • Date Filed
    January 26, 2007
    17 years ago
  • Date Published
    August 30, 2007
    17 years ago
Information
Abstract
The present invention relates to a new process for preparing 6-carboxy-cellulose nitrates and also to their use.
Description
Claims
  • 1. A process for preparing oxidized cellulose nitrates (“6-carboxy-cellulose nitrates”) which comprises a) oxidizing cellulose selectively on the C6 carbon at least partially, based on the parent glucose units of the cellulose, and then subjecting the resulting productb) to nitration.
  • 2. The process according to claim 1, wherein the oxidants used in a) are sterically hindered oxoammonium compounds in combination where appropriate with a secondary oxidant.
  • 3. The process according to claim 2, wherein the 2,2,6,6-tetramethylpiperidinyl 1-oxide (TEMPO) is used as sterically hindered oxoammonium compounds in a).
  • 4. The process according to claim 1, wherein the cellulose employed in a) has an average degree of polymerization (DP) as determined via the intrinsic viscosities (IVs) of 900 to 8500.
  • 5. The process according to claim 1, wherein the oxidation is carried out at a temperature of 0 to 30° C. and a pH of 8 to 11.
  • 6. The process according to claim 1, wherein after step a) and before nitration sodium borohydride or alkali metal chlorites are added for the purpose of stabilization.
  • 7. The process according to claim 1, wherein the nitration in b) is carried out using a mixture of nitric acid, sulphuric acid and water.
  • 8. The process according to claim 3, wherein the cellulose employed in a) has an average degree of polymerization (DP) as determined via the intrinsic viscosities (IVs) of 1800 to 3000.
  • 9. The process according to claim 8, wherein the oxidation is carried out at a temperature of 0 to 10° C. and a pH of 8 to 11.
  • 10. The process according to claim 9, wherein after step a) and before nitration sodium borohydride or alkali metal chlorites are added for the purpose of stabilization.
  • 11. The process according to claim 10, wherein the nitration in b) is carried out using a mixture of nitric acid, sulphuric acid and water.
  • 12. A product containing 6-carboxy-cellulose nitrate, obtainable by a process according to claim 1.
  • 13. The product according to claim 12, wherein the product has a carboxyl group content of 0.01 to 0.15 per AGU.
  • 14. The product according to claim 12, wherein the product has a carboxyl group content of 0.03 to 0.12 per AGU.
  • 15. An aqueous dispersion comprising the product according to claim 12.
  • 16. The aqueous dispersion as claimed in claim 15 which has a solids content of 10 to 50% by weight.
  • 17. The aqueous dispersion as claimed in claim 15 which has a solids content of 20 to 35% by weight.
  • 18. An ink or paint which comprises the product as claimed in claim 12.
  • 19. A process to prepare an ink or paint which comprises using the product as claimed in claim 12.
  • 20. A process to prepare a coating which comprises using the product as claimed in claim 12.
  • 21. The process as claimed in claim 20 wherein leather or wood is coated.
  • 22. Substrates coated with coatings obtainable using products containing 6-carboxy-cellulose nitrate.
Priority Claims (1)
Number Date Country Kind
102006004042.2 Jan 2006 DE national