Stretchable absorbent composite with low superaborbent shake-out
View Patent ↗An article comprises a stretchable absorbent composite ( 30 ) that includes a quantity of superabsorbent particles ( 32 ) which are operatively contained within a matrix of elastomeric polymer fibers ( 34 ). In particular aspects, the composite article can include at least about 60 wt % of the superabsorbent particles and not more than about 40 wt % of the elastomeric polymer fibers, based on a total weight of the composite. In other aspects, the composite article can provide a high stretchability. Additional aspects can provide a low shake-out. Particular configurations can, for example, provide a stretchability value of at least about 30%. Additional aspects can include a configuration that provides a shake-out value of not more than about 2%. In further aspects, the absorbent composite can include superabsorbent particles having a coating of treatment-material that is thermally processible. Additional aspects can include a treatment-material which is water soluble.
1. An article comprising, a stretchable absorbent composite including a quantity of superabsorbent particles which have a substantially continuous thermoplastic coating and are operatively contained within a matrix of elastomeric polymer fibers, wherein
said composite includes at least about 60 wt % of the superabsorbent particles and not more than about 40 wt % of the elastomeric polymer fibers, based on a total weight of the composite; wherein said thermoplastic coating includes at least one material selected from the group consisting of polyethylene oxide, polypropylene oxide, ethylene oxide-propylene oxide copolymer, polyethylene glycol, polypropylene glycol, ethylene glycol-propylene glycol copolymer, modified polysaccharides, such as hydroxypropyl cellulose, methyl cellulose, methyl ethyl cellulose, polyethylene imine, and combinations thereof; wherein said superabsorbent with said thermoplastic coating exhibits a centrifuge retention capacity of at least about 15 g/g; and wherein said thermoplastic coating has a melting-point temperature of at least 60° C. and not more than 150° C.;
said composite provides a stretchability value of at least about 30% and a shake-out value of not more than about 2%; and
the elastomeric polymer fibers have been produced from a polymer material having a melt flow rate of at least about 100 g/10 min.
2. The article as recited in claim 1 , wherein said composite provides a shake-out value of not more than about 1.2%.
3. The article as recited in claim 1 , wherein said composite provides a shake-out value of not more than about 0.8%.
4. The article as recited in claim 1 , wherein said composite article includes at least about 5 wt % of the elastomeric polymer fibers.
5. The article as recited in claim 1 , wherein said polymer fibers include an olefin elastomer material.
6. The article as recited in claim 1 , wherein said polymer fibers include a surfactant.
7. The article as recited in claim 1 , wherein said polymer fibers include at least about 0.1 wt % of an operative surfactant, based on a total weight of the polymer fibers and surfactant.
8. The article as recited in claim 1 , wherein the composite further includes an amount of cellulosic fibers and the amount of cellulosic fibers is at least about 5 wt %, and up to about 35 wt %, based on the total weight of the composite.
9. The article as recited in claim 1 , wherein said superabsorbent particles have a Thermal Stickiness Index at least about 40 and a Centrifuge Retention Capacity value at least about 20 g/g.
10. The article as recited in claim 1 , wherein said superabsorbent particles have a Thermal Stickiness Index at least about 60 and a Centrifuge Retention Capacity value at least about 20 g/g.
11. The article as recited in claim 1 , wherein said superabsorbent particles have a Thermal Stickiness Index at least about 80 and a Centrifuge Retention Capacity value at least about 20 g/g.
12. The article as recited in claim 1 , wherein said polymer fibers have a fiber diameter which is not more than a maximum of about 20 μm and not less than a minimum of about 8 μm.
13. The article as recited in claim 1 , wherein not more than about 20 wt % of said polymer fibers have a fiber diameter which is larger than about 20 μm; and not more than about 20 wt % of said polymer fibers have a fiber diameter which is less than about 8 μm.
14. The article as recited in claim 1 , wherein
said composite provides a shake-out value of not more than about 1.2%; and
said polymer fibers have been produced from a quantity of polymer-melt processed at a temperature of at least about 200° C.
15. The article as recited in claim 1 , wherein said superabsorbent particles have been combined with said polymer fibers during a formation of the polymer fibers, and the formation of the polymer fibers has included a meltblowing operation.
16. The article as recited in claim 1 , wherein the composite article has a stretchability value of at least about 50%.
17. The article as recited in claim 1 , wherein the composite article has a stretchability value of up to about 300% or more.
18. The article as recited in claim 1 , further including a liquid-permeable topsheet and a backsheet; wherein the matrix of elastomeric polymer fibers and the superabsorbent particles are operatively sandwiched between the topsheet and backsheet.
19. The article as recited in claim 1 , wherein
the absorbent composite includes at least about 5 wt % and not more than about 25 wt % of the elastomeric polymer fibers, and includes not more than about 15 wt % of cellulosic fibers, based on the total weight of the absorbent composite;
the absorbent composite further includes a surfactant;
the thermoplastic coating is thermally processible and water soluble;
the elastomeric polymer fibers have been produced from a quantity of polymer-melt having a temperature of at least about 200° C. and not more than about 315° C.