Water-metachromatic cloth sheet, toy set using the same, and writing instrument for water-metachromatic members
AssigneeThe Pilot Ink Co., Ltd.
InventorsAkio Nakashima, Takao Kani
Life of this patent
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Abstract
A water-metachromatic sheet has a support with a porous layer containing a binder resin with dispersed fine-particle silicic acid. The sheet is capable of rendering different transparency between water absorbed and unabsorbed states. The support is a cloth having a weight per unit area of 30 gm2 to 1,000 gm2, the fine-particle silicic acid is contained in an amount of from 1 gm2 to 30 gm2, and the fine-particle silicic acid is incorporated in an amount from 0.5 to 2 parts by weight based on 1 part by weight of the binder resin.
Claims14
A reversible water-metachromatic hand writing toy cloth sheet which comprises a cloth and a water-impermeable sheet on a back of said cloth, said cloth bearing on a front thereof a porous layer comprising a binder resin having fine-particle silicic acid fixed in a dispersed state therein, said water-metachromatic cloth sheet exhibiting different transparency between a water-absorbed state and a water-unabsorbed state,
- wherein said cloth has a weight per unit area of 30 g/m2 to 1,000 g/m2, the amount of said fine-particle silicic acid in said porous layer is 1 g/m2 to 30 g/m2, and the amount of said fine-particle silicic acid per 1 part by weight of the binder is 0.5 to 2 parts by weight.
Dependencies are inferred from the claim text.