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AssigneeKao Corporation
InventorsHirohiko Hanada, Nobuyoshi Yamaguchi, Kazutoshi Ide, Hiroyuki Saijo, Hiromitsu Hayashi, Hiroyuki Yamashita
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The present invention provides a laundry detergent sheet with significant improvements in solubility. That is, the invention provides a sheet of laundry detergent comprising a layer containing a detergent composition and a water-soluble substrate provided on both sides of the layer, wherein said layer comprises a water-soluble or disintegrating-in-water particle group, having an average particle diameter of 60 to 2000 μm, consisting of a particle group. The water-soluble or disintegrating-in-water particle group means less than 0.025 g of residue on a screen after 0.5 g of the particle group is introduced into 1 L water at 10° C., stirred at a revolution rate of 800 rpm for 10 minutes, and sifted through a screen of 200 mesh size.
A method of producing a sheet of laundry detergent, which comprising mixing a detergent composition with a water-soluble or disintegrating-in-water particle group having an average particle diameter of 60 to 2000 μm, consisting of a particle group obtained by spray-drying slurry containing at least one member selected from a water-soluble inorganic material, a water-insoluble or water-sparingly-soluble inorganic material and a water-soluble organic material and/or a detergent particle group comprising a surfactant carried on said particle group, then forming the resulting mixture into a layer, and joining a water-soluble substrate on both sides of the resulting layer.
Dependencies are inferred from the claim text.