Claims
- 1. Process for bleaching paper pulp or cellulosic fibers by contacting the paper pulp or cellulosic fibers with a stabilized solution containing water, a peroxidic compound used for bleaching and a stabilizer, which stabilizer is at least one polymer derived from an alpha-hydroxyacrylic acid, which polymer is a homopolymer and contains units of the formula: ##STR4## where R.sub.1 and R.sub.2 represent hydrogen or an alkyl group comprising from 1 to 3 carbon atoms which can be substituted by a hydroxyl group or a halogen atom, R.sub.1 and R.sub.2 being identical or different, and where M represents a sodium or potassium atom or an ammonium group, said peroxide compound being present in an amount between 0.01 and 30% by weight relative to the weight of solvent, said polymer having an average molecular weight of between 2,000 and 800,000 and being present in an amount between 0.01 and 30% by weight relative to the weight of water.
- 2. Process according to claim 1, wherein M represents a sodium atom.
- 3. Process according to claim 2, wherein the polymer is sodium poly-alpha-hydroxyacrylate.
- 4. Process according to claim 1, wherein the solution contains hydrogen peroxide as the peroxidic compound.
- 5. Process according to claim 1, wherein the solution contains a basic compound.
- 6. Process according to claim 5, wherein the basic compound is sodium hydroxide.
- 7. A process according to claim 1, wherein the material being bleached is a paper pulp.
- 8. A process according to claim 7, wherein the paper pulp is a mechanical pulp, a chemical pulp, a semi-chemical pulp, a mechanical-chemical pulp, or a thermomechanical pulp.
- 9. A process according to claim 1, wherein the material being bleached is a cellulosic fiber.
- 10. A process according to claim 9, wherein the cellulosic fiber is a jute fiber, cotton fiber, linen fiber, ramie fiber, or sisal fiber.
- 11. A process according to claim 9, wherein the cellulosic fiber is an artificial fiber made from regenerated cellulose.
- 12. A process according to claim 11, wherein the artificial fiber is rayon, viscose rayon, or cellulose acetate.
Priority Claims (1)
Number |
Date |
Country |
Kind |
74434 |
Feb 1976 |
LUX |
|
CROSS REFERENCE TO RELATED APPLICATION
This application is a continuation-in-part of applicant's copending U.S. application Ser. No. 769,666, filed Feb. 17th, 1977 abandoned.
US Referenced Citations (8)
Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
769666 |
Feb 1977 |
|