초록 ▼

This invention is directed to coated water-swellable materials, typically solid, particulate, water-swellable materials, i.e. materials that comprise hydrogel-forming polymers, whereof at least a part is coated with a coating, which substantially does not break when the polymers swell, as set out i

This invention is directed to coated water-swellable materials, typically solid, particulate, water-swellable materials, i.e. materials that comprise hydrogel-forming polymers, whereof at least a part is coated with a coating, which substantially does not break when the polymers swell, as set out in the method herein. Said coating is present at a level of at least 1% by weight of the water-swellable material. The coating comprises preferably an elastomeric polymeric material. The invention also relates products, e.g., disposable absorbent articles, comprising such coated water-swellable material.

대표청구항 ▼

What is claimed is: 1. A water-swellable material that comprises hydrogel forming polymers in the form of particles, the hydrogel forming polymers being coated by a coating formed from a coating agent comprising an elastomeric polymeric material, whereby said coating is present at a level of at lea

What is claimed is: 1. A water-swellable material that comprises hydrogel forming polymers in the form of particles, the hydrogel forming polymers being coated by a coating formed from a coating agent comprising an elastomeric polymeric material, whereby said coating is present at a level of at least 1% by weight of the water-swellable material, and wherein the water swellable material has a CCRC of at least 10 g/g and wherein, for at least a part of the coated hydrogel forming polymers, said coating is non-breaking, when the water-swellable material is swollen to equilibrium in 0.9% saline solution and wherein said part of the coated hydrogel forming polymers that has a non-breaking coating of an elastomeric polymeric material is at least 60% by weight of the material having a coating with an elastomeric, polymeric material. 2. A water-swellable material according to claim 1, wherein the coating has an average thickness of at least 5 μm. 3. A water-swellable material according to claim 1, wherein the coating has an average thickness of at least 10 μm. 4. The water-swellable material according to claim 1, wherein the coating covers at least about 80% of the surface of the hydrogel forming polymer. 5. The water-swellable material according to claim 1, wherein the coating is completely continuous. 6. The water-swellable material according to claim 1, wherein the coating is completely connected. 7. The water-swellable material according to claim 1, wherein the coating completely circumscribes the hydrogel forming polymer. 8. The water-swellable material according to claim 1, wherein the hydrogel forming polymer has a mass median particle size of from about 10 μm to about 1 mm. 9. A water-swellable material that comprises hydrogel forming polymers in the form of particles, the hydrogel forming polymer being coated by a coating formed from a coating agent comprising a polyurethane, whereby said coating is present at a level of at least 1% by weight of the water-swellable material, and wherein the water swellable material has a CCRC of at least 10 g/g and wherein, for at least a part of the coated hydrogel forming polymers, said coating is non-breaking, when the water-swellable material is swollen to equilibrium in 0.9% saline solution. 10. A water-swellable material according to claim 9, wherein the coating has an average thickness of at least 5 μm. 11. A water-swellable material according to claim 9, wherein the coating has an average thickness of at least 10 μm. 12. The water-swellable material according to claim 9, wherein the coating covers at least about 80% of the surface of the hydrogel forming polymer. 13. The water-swellable material according to claim 9, wherein the coating is completely continuous. 14. The water-swellable material according to claim 9, wherein the coating is completely connected. 15. The water-swellable material according to claim 9, wherein the coating completely circumscribes the hydrogel forming polymer. 16. The water-swellable material according to claim 9, wherein the hydrogel forming polymer has a mass median particle size of from about 10 μm to about 1 mm.