Mixed polymer network
View Patent ↗A mixed polymer network made from reacting a carboxyalkyl cellulose and a synthetic water-soluble polymer with a crosslinking agent.
1. A composition, obtained by reacting a carboxyalkyl cellulose, a carboxyalkyl lignin and a synthetic water-soluble polymer with a crosslinking agent, wherein the water-soluble polymer comprises a polymer having carboxylic acid or carboxylic acid derivative substituents, wherein the crosslinking agent reacts with at least one of the carboxyalkyl cellulose or water-soluble polymer.
2. The composition of claim 1 , wherein the ratio of carboxyalkyl cellulose to water-soluble polymer is from about 50:50 to about 95:5 weight/weight.
3. The composition of claim 1 , wherein the carboxyalkyl cellulose is selected from the group consisting of carboxymethyl cellulose and carboxyethyl cellulose.
4. The composition of claim 1 , wherein the carboxyalkyl cellulose is derived from an unbleached or lightly bleached cellulose.
5. The composition of claim 4 , wherein the unbleached or lightly bleached cellulose has a kappa value of from about 1 to about 65.
6. The composition of claim 1 , wherein the water-soluble polymer having carboxylic acid substituents is selected from the group consisting of a polyacrylic acid, a polymaleic acid, a polyaspartic acid, a copolymer of acrylic acid and acrylamide, a copolymer of acrylic acid and maleic acid, a copolymer of maleic acid and itaconic acid, and mixtures thereof.
7. The composition of claim 1 , wherein the polymer having carboxylic acid derivative substituents is a polyacrylamide.
8. The composition of claim 1 , wherein the crosslinking agent is selected from the group consisting of a diol, a diamine, an aminol, and mixtures thereof.
9. The composition of claim 1 , wherein the crosslinking agent is selected from the group consisting of an aldehyde, a dialdehyde, a dialdehyde sodium bisulfite addition product, a dihalide, a diene, a diepoxide, a haloepoxide, a dicarboxylic acid, a polycarboxylic acid, a polyoxazoline functionalized polymer, a polyvalent cation, a polycationic polymer, and mixtures thereof.
10. The composition of claim 1 , wherein the water-soluble polymer is selected from the group consisting of polyacrylic acid, polyacrylamide, and mixtures thereof.
11. The composition of claim 1 having a Free Swell Capacity of at least about 45 g/g.
12. The composition of claim 1 having a Centrifuge Capacity of at least about 10 g/g.
13. The composition of claim 1 having an Absorbency Under Load value of at least about 20 g/g.
14. A composition obtained by a method comprising:
(a) treating a carboxyalkyl cellulose, a carboxyalkyl lignin and a synthetic water-soluble polymer with a crosslinking agent to provide a reaction mixture, wherein the crosslinking agent reacts with at least one of the carboxyalkyl cellulose or water-soluble polymer and wherein the water-soluble polymer comprises a polymer having carboxylic acid or carboxylic acid derivative substituents; and
(b) crosslinking the reaction mixture to provide the composition.
15. The composition of claim 14 , wherein the ratio of carboxyalkyl cellulose to water-soluble polymer is from about 50:50 to about 95:5 weight/weight.
16. The composition of claim 14 , wherein the carboxyalkyl cellulose is selected from the group consisting of carboxymethyl cellulose and carboxyethyl cellulose.
17. The composition of claim 14 , wherein the synthetic water-soluble polymer is selected from the group consisting of a polyacrylamide, a polyacrylic acid, a polymaleic acid, a polyaspartic acid, a copolymer of acrylic acid and acrylamide, a copolymer of acrylic acid and maleic acid, a copolymer of maleic acid and itaconic acid, and mixtures thereof.
18. The composition of claim 14 , wherein the crosslinking agent is selected from the group consisting of a diol, a diamine, an aminol, an aldehyde, a dialdehyde, a dialdehyde sodium bisulfite addition product, a dihalide, a diene, a diepoxide, a haloepoxide, a dicarboxylic acid, a polycarboxylic acid, a polyoxazoline functionalized polymer, a polyvalent cation, a polycationic polymer, and mixtures thereof.
19. A composition, obtained by the reaction of a carboxyalkyl cellulose, a carboxyalkyl lignin and a synthetic water-soluble polymer having carboxylic acid or carboxylic acid derivative substituents with two crosslinking agents, wherein each crosslinking agent reacts with at least one of the carboxyalkyl cellulose or water-soluble polymer.