Absorbent nonwoven fabric and its production
First Claim
1. A wet-laid nonwoven fabric comprising a blend of 1 to 50% by weight of fibres of weight 2 to 30 decitex per filament and length 3 to 100 mm of a water-swellable water-insoluble superabsorbent polymer, which is a crosslinked copolymer of 50 to 95% by weight ethylenically unsaturated carboxylic monomer and 5 to 50% by weight copolymerisable ethylenically unsaturated monomer, and 99 to 50% by weight of less absorbent fibres having an absorbency of less than 10 g/g measured by retention to centrifuging of a 0.9% by weight saline solution.
7 Assignments
0 Petitions
Accused Products
Abstract
A wet-laid nonwoven fabric comprises a blend of 1 to 50% by weight of fibres of a water-swellable water-insoluble superabsorbent polymer and 99 to 50% by weight of less absorbent fibres, for example fibres having an absorbency of less than 10 g/g measured by retention to centrifuging of a 0.9% by weight saline solution.
-
Citations
12 Claims
- 1. A wet-laid nonwoven fabric comprising a blend of 1 to 50% by weight of fibres of weight 2 to 30 decitex per filament and length 3 to 100 mm of a water-swellable water-insoluble superabsorbent polymer, which is a crosslinked copolymer of 50 to 95% by weight ethylenically unsaturated carboxylic monomer and 5 to 50% by weight copolymerisable ethylenically unsaturated monomer, and 99 to 50% by weight of less absorbent fibres having an absorbency of less than 10 g/g measured by retention to centrifuging of a 0.9% by weight saline solution.
- 8. A process for the production of a wet-laid nonwoven fabric, in which process fibres having an absorbency of less than 10 g/g, measured by retention to centrifuging of a 0.9% by weight saline solution, are slurried in water, fibers of weight 2 to 30 decitex per filament and length 3 to 100 mm of a water-swellable water-insoluble superabsorbent polymer, which is a crosslinked copolymer of 50 to 95% by weight ethylenically unsaturated carboxylic monomer and 5 to 50% by weight copolymerisable ethylenically unsaturated monomer, are added to this slurry to form a mixed slurry containing both the superabsorbent polymer fibres and the less absorbent fibres, the mixed slurry is deposited as a layer on a foraminous support so that part of the water drains from the layer of slurry on the support, and the resulting fibrous layer is dried to form the nonwoven fabric.
Specification