Granted Patent B2

US 7,163,966 · App. 10/741,271 · Granted Jan 16, 2007

Abstract

Claims (25)

1. A superabsorbent polymer comprising a resin encapsulated blowing agent and having a vortex time of about 40 seconds or less wherein said resin is selected from natural or synthetic resins, acrylonitrile-butadiene rubbers, viscous settable ceramic materials, polyolefins, polyethylene gylcol, olefin copolymers, polyaromatic olefins, styrenic compounds or polymerized halo-diolefins, and wherein the resin encapsulated blowing agent provides a controllable delayed release of the blowing agent.

2. The superabsorbent polymer of claim 1 wherein the vortex time is about 32 seconds or less.

3. The superabsorbent polymer of claim 1 wherein the resin encapsulated blowing agent comprising a carbonate or compound thereof.

4. The superabsorbent polymer of claim 1 wherein the resin is polyethylene glycol.

5. The superabsorbent polymer of claim 1 having an AUL(0.9 psi) of about 10 g/g of more.

6. The superabsorbent polymer of claim 1 having a tea bag retention of about 20 g/g of more.

7. A superabsorbent polymer comprising:

a) from about 55 to about 99.9 wt. % of polymerizable unsaturated acid group containing monomers;

b) from about 0.001 to about 5.0 wt. % of internal crossliniking agent; wherein the composition has a degree of neutralization of more than about 20 mol %; and

c) from about 0.05 to about 10.0 wt. % of a resin encapsulated blowing agent wherein said resin is selected from natural or synthetic resins, acrylonitrile-butadiene rubbers, viscous settable ceramic materials, polyolefins, olefin copolymers, polyaromatic olefins, styrenic compounds or polymerized halo-diolefins, and wherein the resin encapsulated blowing agent provides a controllable delayed release of the blowing agent.

8. The superabsorbent polymer of claim 7 wherein the resin encapsulated blowing agent comprising a carbonate or compound thereof.

9. The superabsorbent polymer of claim 7 wherein the resin is polyethylene glycol.

10. The superabsorbent polymer of claim 7 having a vortex time of about 40 seconds or less.

11. The superabsorbent polymer of claim 7 having a vortex time of about 32 seconds or less.

12. The superabsorbent polymer of claim 7 having a vortex time of about 20 seconds or less.

13. The superabsorbent polymer of claim 7 having an absorbency under load at 0.9 psi of about 10 g/g of more.

14. The superabsorbent polymer of claim 7 having a tea bag retention of about 20 g/g of more.

15. The superabsorbent polymer of claim 7 having a tea bag retention of about 24 g/g of more.

16. An absorbent article comprising a superabsorbent polymer comprising:

a) from about 55 to about 99.9 wt. % of polymerizable unsaturated acid group containing monomers;

b) from about 0.001 to about 5.0 wt. % of internal crossliniking agent; wherein the wherein the composition has a degree of neutralization of more than about 20 mol %; and

c) from about 0.05 to about 10.0 wt. % of a resin encapsulated blowing agent wherein said resin is selected from natural or synthetic resins, acrylonitrile-butadiene rubbers, viscous settable ceramic materials, polyolefins, olefin copolymers, polyaromatic olefins, styrenic compounds or polymerized halo-diolefins, wherein the superabsorbent polymer has a vortex time of about 40 seconds or less, and wherein the resin encapsulated blowing agent provides a controllable delayed release of the blowing agent.

17. The superabsorbent polymer of claim 1 wherein the resin encapsulated blowing agent is a polyethylene glycol coated sodium carbonate.

18. The superabsorbent polymer of claim 7 wherein the resin encapsulated blowing agent is a polyethylene glycol coated sodium carbonate.

19. The absorbent article of claim 16 wherein the resin encapsulated blowing agent is a polyethylene glycol coated sodium carbonate.

Assignments (7)