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 or A-B-A, 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. An article comprising:
a substrate; and
a thermoplastic composition disposed on said substrate, said thermoplastic composition comprising
from about 1% by weight to 25% by weight block copolymer comprising an A block comprising polyvinylarene and a B block comprising poly(monoalkenyl),
from about 45% by weight to about 75% by weight spherical superabsorbent polymer particles having a median particle diameter of from 20 μm to 30 μm, and plasticizer,
said thermoplastic composition exhibiting a viscosity of no greater than 100,000 centipoise at 300° F., as measured according to the viscosity test method.
2. The article of claim 1 , wherein said substrate is a film.
3. The article of claim 1 , wherein said thermoplastic composition further comprises tackifying agent.
4. The article of claim 1 , wherein said substrate comprises a liquid impermeable barrier sheet, said article further comprising a liquid permeable sheet, said thermoplastic composition being disposed between said liquid permeable sheet and said barrier sheet.
5. An article comprising:
a substrate; and
a thermoplastic composition disposed on the substrate, said thermoplastic composition comprising
block copolymer comprising an A block comprising polyvinylarene and a B block comprising poly(monoalkenyl),
from about 45% by weight to about 75% by weight spherical superabsorbent polymer particles having a median particle diameter of from 20 μm to 30 μm, and plasticizing oil,
said composition exhibiting at least one of
a water gel time of no greater than 2 minutes,
a 0.9% saline solution gel time of no greater than 1 hour,
an absorbent capacity of at least 70 g water/g of composition,
an absorbent capacity of at least 25 g 0.9% aqueous saline solution/g of composition, and
a wet tensile strength of at least 15 g/in 2 ,
said composition exhibiting a viscosity of no greater than 30,000 centipoise at 300° F., as measured according to the viscosity test method.
6. The article of claim 5 , wherein said substrate is a film.
7. The article of claim 5 , wherein said thermoplastic composition exhibits 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.
8. The article of claim 5 , wherein said thermoplastic composition further comprises tackifying agent.
9. A method of making the article of claim 1 , said method comprising applying said thermoplastic composition on said substrate.
10. The method of claim 9 , wherein said applying comprises slot coating, gravure coating, screen printing, spiral spraying, melt blowing, random spraying, nonrandom spraying, or a combination thereof.
11. A method of making the article of claim 5 , said method comprising applying said thermoplastic composition on said substrate.
12. The method of claim 11 , wherein said applying comprises slot coating, gravure coating, screen printing, spiral spraying, melt blowing, random spraying, nonrandom spraying, or a combination thereof.
13. An article comprising:
a substrate; and
a thermoplastic composition disposed on said substrate, said thermoplastic composition comprising
from about 1% by weight to 25% by weight block copolymer comprising an A block comprising polyvinylarene and a B block comprising poly(monoalkenyl),
from about 60% by weight to about 75% by weight superabsorbent polymer particles having a median particle diameter of from 20 μm to 30 μm, and plasticizer,
said thermoplastic composition exhibiting a viscosity of no greater than 100,000 centipoise at 300° F., as measured according to the viscosity test method.
14. The article of claim 13 , wherein said thermoplastic composition exhibits a viscosity no greater than 30,000 cps at 300° F.
15. The article of claim 13 , wherein said thermoplastic composition exhibits a viscosity of from 15,000 cps to 65,000 cps at 300° F.
16. The article of claim 1 , wherein the thermoplastic composition exhibits a viscosity of no greater than 30,000 centipoise at 300° F.
17. The article of claim 16 , wherein the thermoplastic composition further comprises tackifying agent.
18. The article of claim 17 , wherein the thermoplastic composition further comprises surfactant.
19. The article of claim 17 , wherein the plasticizer comprises a solid plasticizer.
20. The article of claim 17 , wherein the plasticizer comprises a plasticizer oil.
21. The article of claim 16 , comprising from about 60% by weight to about 75% by weight of the superabsorbent polymer particles.
22. The article of claim 1 , wherein said thermoplastic composition exhibits a viscosity of no greater than 65,000 cps at 300° F.
23. The article of claim 13 , wherein said particles are spherical.