Heating element and heating implement containing the same

Patent metadata

Field	Value
Publication number	US-9915443-B2
Application number	US-201314405943-A
Country	US
Kind code	B2
Filing date	Jun 7, 2013
Priority date	Jun 7, 2012
Publication date	Mar 13, 2018
Grant date	Mar 13, 2018

Abstract

The present invention relates to a heating element ( 1 ) having an exothermic composition containing an oxidizable metal, a carbon component and water. Tri-alkali metal phosphate is contained in the heating element ( 1 ), and the content of water in the heating element ( 1 ) is equal to or larger than 50 parts by mass and equal to or smaller than 90 parts by mass for 100 parts by mass of the oxidizable metal, and the content of tri-alkali metal phosphate as a phosphate group is equal to or larger than 0.5 parts by mass and equal to or smaller than 1.1 parts by mass for 100 parts by mass of the oxidizable metal.

First claim

The invention claimed is:

1. A heating element comprising: an exothermic composition having an oxidizable metal, a carbon component and water,
wherein the heating element comprises tri-alkali metal phosphate,
wherein the content of the water in the heating element is equal to or larger than 50 parts by mass and equal to or smaller than 90 parts by mass for 100 parts by mass of the oxidizable metal, and
wherein the content of the tri-alkali metal phosphate represented by an amount of a phosphate group is equal to or larger than 0.5 parts by mass and equal to or smaller than 1.1 parts by mass for 100 parts by mass of the oxidizable metal,
wherein the heating element comprises potassium ion and sodium ion, and
wherein a mass ratio (W K+ /(W K+ +W Na+ )) of the content of potassium ion (W K+ ) in the heating element over a summation (W K+ +W Na+ ) of the content of potassium ion (W K+ ) and the content of sodium ion (W Na+ ) in the heating element is equal to or higher than 0.1 and equal to or lower than 0.6.

2. The heating element according to claim 1 , wherein the heating element further comprises at least one electrolyte selected from the group consisting of a sulfate or chloride of an alkali metal or alkaline earth metal, ferrous chloride, and ferric chloride.

3. The heating element according to claim 2 , wherein the electrolyte is at least one electrolyte selected from the group consisting of sodium chloride, potassium chloride, calcium chloride and magnesium chloride.

4. The heating element according to claim 1 , further comprising a thickening agent.

5. The heating element according to claim 4 , wherein the thickening agent comprises at least one agent selected from the group consisting of a polysaccharide thickening agent, a starch thickening agent, a cellulose thickening agent, a metallic soap thickening agent, and a mineral thickening agent.

6. The heating element according to claim 1 , wherein the heating element is in the form of a sheet and the content of the oxidizable metal in the heating element is from 100 to 3,000 g/m 2 represented by grammage.

7. The heating element according to claim 1 , wherein the content of the carbon component is from 6 to 15 parts by mass for 100 parts by mass of the oxidizable metal.

8. The heating element according to claim 1 , wherein the heating element comprises a base material layer and an exothermic layer in layers.

9. The heating element according to claim 8 , wherein the base material layer is formed of a water absorbent sheet.

10. The heating element according to claim 9 , wherein the water absorbent sheet comprises at least one layered sheet of a paper or a nonwoven fabric producible by a fiber material, or a fiber sheet having a paper and a nonwoven fabric in layers.

11. The heating element according to claim 8 , wherein the base material layer further comprises a water absorbent polymer.

12. The heating element according to claim 8 , comprising a plurality of the base material layers,
wherein the exothermic layer is interposed between the base material layers.

13. The heating element according to claim 8 , comprising a plurality of the exothermic layers,
wherein the exothermic layers are formed on both sides of the base material layer.

14. A heating implement, comprising:
the heating element according to claim 1 ; and
a bag being capable of comprising the heating element,
wherein a region having an air permeability is provided in at least a portion of the bag, and air resistance (JIS P 8117) of the region having an air permeability is equal to or higher than 1,000 second/100 ml and equal to or lower than 50,000 second/100 ml.

15. The heating implement according to claim 14 , wherein the bag is provided by layering a first bag sheet and a second bag sheet and joining a circumference section thereof, such that the heating element is contained in an interior space of the bag formed by the joint.

16. The heating implement according to claim 15 , wherein the first bag sheet has a higher air permeability as compared with the second bag sheet.

17. The heating implement according to claim 14 , wherein water vapor is capable of being generated as the oxidizable metal is oxidized.

Assignees

• Kao Corp

Inventors

• Oka Takeshi
• SENDA Shouko

Classifications

• F24V30/00 Primary

  Apparatus or devices using heat produced by exothermal chemical reactions other than combustion · CPC title

• A61F2007/0004

  Eyes or part of the face surrounding the eyes · CPC title

• A61F7/034

  Flameless · CPC title

• F24J1/00 Primary

  Mechanical Engineering · mapped topic