Lignocellulosic materials and the products made therefrom
View Patent ↗A process comprising treating a lignocellulosic material preferably pulp in the presence of a transition metal catalyst with a oxidizing agent selected from a group consisting of hydrogen peroxide, hypochlorite, hypochlorous acid and any combination thereof to form a treated lignocellulosic material having a viscosity equal to or less than about 17 cp and having reducing functional groups selected from the group consisting of aldehyde and aldehyde type functional groups at the C6 and C1 positions but predominating at the C1 position.
1. A method for making an absorbent composite useful for personal hygiene articles which comprises:
dry shredding a treated lignocellulosic material to form an absorbent sub layer material comprised of fluffed base-treated wood pulp, said treated lignocellulosic material having a viscosity of 10 cps or less,
comprising functional groups selected from the group consisting of aldehyde functional groups, hemiacetal functional groups and combinations thereof, and
made by a process comprising treating a lignocellulosic material by adding from 0.01 to 0.1% of a catalyst by weight of the lignocellulosic material wherein said catalyst comprises a transition metal selected from iron, zinc, cobalt, nickel, manganese, tungsten, zirconium, cerium, chromium and combinations thereof in the presence of from 0.5 to 5% oxidizing agent by weight of the lignocellulosic material wherein said oxidizing agent is selected from the group consisting of hydrogen peroxide, hypochlorite, hypochlorous acid and any combination thereof at a pH from about 2 to about 6 to form said treated lignocellulosic material without refining thereafter said treating step;
providing at least one fluid permeable top sheet layer and at least one substantially fluid impermeable back sheet layer; and
interposing the sub layer material between the top sheet layer and back sheet layer.
2. A process according to claim 1 , wherein the lignocellulosic material is a wood pulp.
3. A process according to claim 1 , wherein the treated lignocellulosic material has a copper number equal to or greater than about 3.
4. A process according to claim 1 , wherein the treated lignocellulosic material has a copper number equal to or greater than about 4.4.
5. A process according to claim 4 wherein the treated lignocellulosic material has a copper number equal to or greater than about 5.
6. A process according to claim 5 wherein the treated lignocellulosic material has a copper number equal to or greater than about 5.5.
7. A process according to claim 1 , wherein the treated lignocellulosic material has a carboxy number equal to or more than about 3.5 meq/100 grams of oven dried treated material.
8. A process according to claim 7 wherein the treated lignocellulosic material has a carboxy number equal to or more than about 4 meq/100 grams of oven dried treated material.
9. A process according to claim 8 wherein the treated lignocellulosic material has a carboxy number equal to or more than about 5 meq/100 grams of oven dried treated material.
10. A process according to claim 9 wherein the treated lignocellulosic material has a carboxy number equal to or more than about 5.5 meq/100 grams of oven dried treated material.
11. A process according to claim 1 wherein the treated lignocellulosic material has a viscosity of from about 2 to about 7 cps.
12. A process according to claim 1 , wherein the treated lignocellulosic material absorbs, adsorbs or absorbs and adsorbs 50% more ammonia as compared to an equal amount of the untreated lignocellulosic material.
13. A process according to claim 1 , wherein the treated lignocellulosic material absorbs, adsorbs or absorbs and adsorbs 60% more ammonia as compared to an equal amount of the untreated lignocellulosic material.
14. A process according to claim 1 , wherein the treated lignocellulosic material absorbs, adsorbs or absorbs and adsorbs 80% more ammonia as compared to an equal amount of the untreated lignocellulosic material.
15. A process according to claim 1 , wherein the treated lignocellulosic material absorbs, adsorbs or absorbs and adsorbs 90% more ammonia as compared to an equal amount of the untreated lignocellulosic material.