Superabsorbent thermoplastic composition and article including same
View Patent ↗A thermoplastic composition that includes from about 1% by weight to 25% by weight block copolymer having the formula (A-B)x where the A block includes polyvinylarene, the B block includes poly(monoalkenyl) and x is an integer of at least one, spherical superabsorbent particles comprising polyacrylate, and plasticizing oil, the composition exhibiting water gel time of no greater than 2 minutes, a viscosity of no greater than 100,000 centipoise and a wet tensile strength of at least 15 g/in 2 .
1. A thermoplastic composition comprising:
from about 1% by weight to 25% by weight block copolymer having the formula (A-B)x or A-B-A where the A block comprises polyvinylarene, the B block comprises poly(monoalkenyl), and x is an integer of at least one;
from about 45% by weight to about 75% by weight superabsorbent polymer particles comprising polyacrylate and having a median particle diameter of from 20 μm to 30 μm; and
from about 15% by weight to about 40% by weight plasticizing oil, and a viscosity of no greater than 100,000 centipoise at 300° F.
2. The thermoplastic composition of claim 1 , further comprising surfactant.
3. The thermoplastic composition of claim 1 , further comprising from about 1% by weight to about 5% by weight surfactant.
4. The thermoplastic composition of claim 1 , comprising from 60% by weight to about 75% by weight said superabsorbent polymer.
5. The thermoplastic composition of claim 1 , wherein the block copolymer is selected from the group consisting of styrene-isoprene-styrene, styrene-ethylene-butylene-styrene, styrene-ethylene-propylene-styrene, styrene-butadiene-styrene and combinations thereof.
6. The thermoplastic composition of claim 1 , wherein said composition exhibits a water gel time of no greater than 2 minutes.
7. The thermoplastic composition of claim 1 , wherein said composition exhibits a water gel time of no greater than 1.5 minutes.
8. The thermoplastic composition of claim 1 , wherein said composition exhibits a water gel time of no greater than 1 minute.
9. The thermoplastic composition of claim 1 , wherein said composition exhibits a 0.9% saline solution gel time of no greater than 4 hours.
10. The thermoplastic composition of claim 1 , wherein said composition exhibits a 0.9% saline solution gel time of no greater than 1 hour.
11. The thermoplastic composition of claim 1 , wherein said composition exhibits a 0.9% saline solution gel time of no greater than 25 minutes.
12. The thermoplastic composition of claim 1 , wherein said composition exhibits a 0.9% saline solution gel time of no greater than 10 minutes.
13. The thermoplastic composition of claim 1 , wherein said composition exhibits a 0.9% saline solution gel time of no greater than 5 minutes.
14. The thermoplastic composition of claim 1 , wherein said composition exhibits an absorbent capacity of at least 60 g water/g of composition.
15. The thermoplastic composition of claim 1 , wherein said composition exhibits an absorbent capacity of at least 70 g water/g of composition.
16. The thermoplastic composition of claim 1 , wherein said composition exhibits an absorbent capacity of at least 90 g water/g of composition.
17. The thermoplastic composition of claim 1 , wherein said composition exhibits an absorbent capacity of at least 100 g water/g of composition.
18. The thermoplastic composition of claim 1 , wherein said composition exhibits an absorbent capacity of at least 110 g water/g of composition.
19. The thermoplastic composition of claim 1 , wherein said composition exhibits an absorbent capacity of at least 25 g 0.9% saline solution/g of composition.
20. The thermoplastic composition of claim 1 , wherein said composition exhibits an absorbent capacity of at least 30 g 0.9% saline solution/g of composition.
21. The thermoplastic composition of claim 1 , wherein said composition exhibits an absorbent capacity of at least 35 g 0.9% saline solution/g of composition.
22. A thermoplastic composition comprising:
block copolymer having the formula (A-B)x or A-B-A where the A block comprises polyvinylarene, the B block comprises poly(monoalkenyl), and x is an integer of at least one;
spherical superabsorbent particles comprising polyacrylate and having a median particle diameter of from 20 μm to 30 μm; and
plasticizing oil,
said composition exhibiting water gel time of no greater than 2 minutes.
23. The thermoplastic composition of claim 22 , wherein said block copolymer is selected from the group consisting of styrene-isoprene-styrene, styrene-ethylene-butylene-styrene, styrene-ethylene-propylene-styrene, styrene-butadiene-styrene and combinations thereof.
24. A thermoplastic composition comprising:
block copolymer having the formula (A-B)x or A-B-A where the A block comprises polyvinylarene, the B block comprises poly(monoalkenyl), and x is an integer of at least one;
spherical superabsorbent particles comprising polyacrylate and having a median particle diameter of from 20 μm to 30 μm; and
plasticizing oil,
said composition exhibiting a 0.9% saline solution gel time of no greater than 1 hour.
25. A thermoplastic composition comprising:
block copolymer having the formula (A-B)x or A-B-A where the A block comprises polyvinylarene, the B block comprises poly(monoalkenyl), and x is an integer of at least one;
spherical superabsorbent particles comprising polyacrylate and having a median particle diameter of from 20 μm to 30 μm; and
plasticizing oil,
said composition exhibiting an absorbent capacity of at least 70 g water/g of composition.
26. A thermoplastic composition comprising:
block copolymer having the formula (A-B)x or A-B-A where the A block comprises polyvinylarene, the B block comprises poly(monoalkenyl), and x is an integer of at least one;
spherical superabsorbent particles comprising polyacrylate and having a median particle diameter of from 20 μm to 30 μm; and
plasticizing oil,
said composition exhibiting an absorbent capacity of at least 25 g 0.9% aqueous saline solution/g of composition.
27. A thermoplastic adhesive composition comprising:
from about 1% by weight to 25% by weight block copolymer having the formula (A-B)x or A-B-A where the A block comprises polyvinylarene, the B block comprises poly(monoalkenyl), and x is an integer of at least one;
from about 45% by weight to about 75% by weight superabsorbent polymer particles comprising polyacrylate and having a median particle diameter of from 20 μm to 30 μm;
tackifying agent; and
from about 15% by weight to about 40% by weight plasticizing oil, said compostition having a viscosity of no greater than 100,000 centipoise at 300° F.
28. An absorbent article comprising:
an absorbent core;
the thermoplastic composition of claim 1 incorporated in said absorbent core.
29. An absorbent article comprising:
an absorbent core; and
the thermoplastic composition of claim 1 disposed on said absorbent core.
30. An absorbent article comprising:
a liquid permeable sheet;
a liquid impermeable barrier sheet;
an absorbent element disposed between the liquid permeable sheet and the barrier sheet; and
the thermoplastic composition of claim 1 disposed on at least one of said liquid permeable sheet, said barrier sheet and said absorbent element.
31. An absorbent article comprising:
a liquid permeable sheet;
a liquid impermeable barrier sheet;
an absorbent element disposed between the liquid permeable sheet and the barrier sheet; and
the thermoplastic composition of claim 1 incorporated in said absorbent element.
32. A thermoplastic composition comprising:
block copolymer having the formula (A-B)x or A-B-A where the A block comprises polyvinylarene, the B block comprises poly(monoalkenyl), and x is an integer of at least one;
spherical superabsorbent particles comprising polyacrylate; and
plasticizing oil,
said composition exhibiting a water gel time of no greater than 2 minutes, a viscosity of no greater than 100,000 centipoise at 300° F. and a wet tensile strength of at least 15 g/in 2 .
33. The thermoplastic composition of claim 32 , wherein said composition exhibits a 0.9% saline solution gel time of no greater than 1 hour.
34. The thermoplastic composition of claim 32 , wherein said composition exhibits a 0.9% saline solution gel time of no greater than 10 minutes.
35. The thermoplastic composition of claim 32 , wherein said composition exhibits a water gel time of no greater than 1.5 minutes, a viscosity of no greater than 30,000 centipoise at 300° F. and a wet tensile strength of at least 40 g/in 2 .
36. The thermoplastic composition of claim 32 , wherein said composition exhibits an absorption capacity of at least 70 g water/g composition.
37. A thermoplastic composition comprising:
block copolymer having the formula (A-B)x or A-B-A where the A block comprises polyvinylarene, the B block comprises poly(monoalkenyl), and x is an integer of at least one;
from about 45% by weight to about 75% by weight superabsorbent polymer particles that include polyacrylate; and
from about 15% by weight to about 40% by weight plasticizing oil,
said composition exhibiting a water gel time of no greater than 2 minutes, and an absorption capacity of at least 70 g water/g composition and at least 10 g 0.9% saline solution/g composition.
said compostion having a viscosity of no greater than 100,000 centipoise at 300° F.
38. A thermosplastic composition comprising:
block copolymer having the formula (A-B)x or A-B-A where the A block comprises polyvinylarene, the B block comprises poly(monoalkenyl), and x is an integer of at least one;
from about 45% by weight to about 75% by weight superabsorbent polymer particles comprising polyacrylate; and
from about 15% by weight to about 40% by weight plasticizer,
said composition exhibiting a viscosity of no greater than about 65,000 centipoise at 300° F.
39. A thermoplastic composition comprising:
thermoplastic polymer selected from the group consisting of amorphous polyolefins, crystalline polyolefins, polylactides, polyvinyl alcohols, copolyesters, polyesters, poly(ehtylene oxide) polyether amides, polyester ether block copolymers, polyamides, and combinations thereof;
from about 45% by weight to about 75% by weight superabsorbant polymer particles comprising polyacrylate; and
from about 15% by weight to about 40% by weight plasticizer,
said composition exhibiting a viscosity of no greater than about 65,000 centipoise at 300° F.
40. A thermoplastic composition comprising:
from about 1% by weight to 25% by weight block copolymer having the formula (A-B)x or A-B-A where the A block comprises polyvinylarene, the B block comprises poly(monoalkenyl), and x is an integer of at least one;
from 60% by weight to 75% by weight superabsorbent polymer particles comprising polyacrylate and having a median particle diameter of from 20μm to 30μm; and
from about 15% by weight to about 40% by weight plasticizing oil.
41. An absorbent article according to claim 31 selected from the group consisting of disposable diapers, sanitary napkins, wound care products, wipes, towels and tissues.