Water-metachromatic laminate, and process for its production
AssigneeThe Pilot Ink Co., Ltd.
InventorsAkio Nakashima, Hisayoshi Kato
Life of this patent
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Abstract
On a support, a porous resin layer which is opaque in a water-unabsorbed state and capable of turning transparent in a water-absorbed state is formed, and also a water-repellent resin layer is so provided as to exist in the porous resin layer at its some area or areas in a co-existent state, to make up a water-metachromatic laminate. A novel toy element can be provided in which latent images standing invisible in a normal condition are rendered visible by means of water as a medium so as to be visually distinguished.
Claims10
A water-metachromatic laminate comprising a support and superposingly provided thereon i) a porous resin layer which is formed of a binder resin to which a low-refractive-index pigment stands fixed dispersedly, and is opaque in a water-unabsorbed state and capable of turning transparent in a water-absorbed state and ii) a water-repellent resin layer so provided as to exist in the porous resin layer at its some area or areas in a co-existent state;
- the porous resin layer being so made up that its area or areas not provided with the water-repellent resin layer turn(s) transparent in a water-absorbed state so that the both layers are visually distinguishable.
A process for producing a water-metachromatic laminate, comprising the steps of;
- providing a porous resin layer on a support;
- and
- thereafter applying onto the porous resin layer a water-repelling solution containing a water-repellent resin, by a printing, coating, spraying, writing or stamping means to make the water-repelling solution adhere to the porous resin layer and penetrate thereinto;
- followed by drying to form a water-repellent resin layer existing in the porous resin layer in a co-existent state.
Dependencies are inferred from the claim text.