Thermally expandable sheet and thermally expandable sheet production method
AssigneeCasio Computer Co., Ltd.
InventorYoshimune Motoyanagi
Life of this patent
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Abstract
A thermally expandable sheet includes: a first thermally expansive layer that is formed on one side of a base and contains a first thermally expandable material and a first binder, the first thermally expansive layer having a first ratio of the first thermally expandable material with respect to the first binder; and a second thermally expansive layer that is formed on the first thermally expansive layer and contains a second thermally expandable material and a second binder, the second thermally expansive layer having a second ratio of the second thermally expandable material with respect to the second binder, wherein the first ratio is lower than the second ratio.
Claims13
A thermally expandable sheet comprising:
- a base;
- a first thermally expansive layer formed on the base,
- wherein the first thermally expansive layer comprises a first thermally expandable material and a first binder, and
- wherein the first thermally expansive layer has a first ratio of the first thermally expandable material with respect to the first binder;
- and
- a second thermally expansive layer formed on the first thermally expansive layer,
- wherein the second thermally expansive layer comprises a second thermally expandable material and a second binder, and
- wherein the second thermally expansive layer has a second ratio of the second thermally expandable material with respect to the second binder,
- wherein the first ratio is lower than the second ratio.
A thermally expandable sheet comprising:
- a base;
- a first thermally expansive layer formed on the base,
- wherein the first thermally expansive layer comprises a first binder and a first thermally expandable material dispersed in the first binder at a first ratio;
- and
- a second thermally expansive layer formed on the first thermally expansive layer
- wherein the second thermally expansive layer comprises a second binder and a second thermally expandable material dispersed in the second binder at a second ratio,
- wherein the second ratio is higher than the first ratio.
Dependencies are inferred from the claim text.