# US 11,028,302 B2 · Cold storage medium

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- Number: US 11,028,302 B2
- Document ID: US11028302B2
- Status: Granted
- Kind: B2
- Application number: 16/703,316
- Filed: 2019-12-04
- Published: 2020-04-02
- Granted: 2021-06-08
- Earliest claimed: 2018-01-29
- Assignees: Panasonic Corporation
- Applicants: Panasonic Corporation
- Inventors: Hironobu Machida; Motohiro Suzuki
- Web page: https://patentgrep.com/patent/US11028302B2

## CPC

- C09K 5/066: {Cooling mixtures; De-icing compositions}
- C09K 5/06: the change of state being from liquid to solid or vice versa
- C09K 5/063: {Materials absorbing or liberating heat during crystallisation; Heat storage materials}
- Y02E 60/14: Thermal energy storage
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

Provided is a cold storage medium according to the present invention contains tetra-n-butylammonium ions, silver ions, at least one kind of halide ions selected from the group consisting of fluoride ions, chloride ions, and bromide ions, water, and at least one kind of carboxylic acid ions each represented by the following chemical formula R—COO− (where R represents a hydrocarbon group).

## Claims

### Claim 1

A cold storage medium, containing:
tetra-n-butylammonium ions;
silver ions;
at least one kind of halide ions selected from the group consisting of fluoride ions, chloride ions, and bromide ions;
water; and
at least one kind of carboxylic acid ions each represented by the following chemical formula (I),
R—COO− (I)
where R represents a hydrocarbon group.

### Claim 2 (depends on 1)

The cold storage medium according to claim 1, wherein
the at least one kind of carboxylic acid ions includes two or more kinds of carboxylic acid ions.

### Claim 3 (depends on 1)

The cold storage medium according to claim 1, wherein
each of the at least one kind of the carboxylic acid ions has a carbon number of not less than 1 and not more than 10.

### Claim 4 (depends on 3)

The cold storage medium according to claim 3, wherein
each of the at least one kind of the carboxylic acid ions has a carbon number of not less than 1 and not more than 7.

### Claim 5 (depends on 4)

The cold storage medium according to claim 4, wherein
a molar ratio of the at least one kind of halide ions to the silver ions is not less than 5 and not more than 20.

### Claim 6 (depends on 5)

The cold storage medium according to claim 5, wherein
the molar ratio of the at least one kind of halide ions to the silver ions is not less than 7.5 and not more than 15.

### Claim 7 (depends on 1)

The cold storage medium according to claim 1, wherein
the at least one kind of carboxylic acid ions is selected from the group consisting of pentanoic acid ions, hexanoic acid ions, heptanoic acid ions, methylbutanoic acid ions, ethylbutanoic acid ions, methylpentanoic acid ions, ethylpentanoic acid ions, propylpentanoic acid ions, methylhexanoic acid ions, ethylhexanoic acid ions, propylhexanoic acid ions, and butylhexanoic acid ions.

### Claim 8 (depends on 1)

The cold storage medium according to claim 1, wherein
the at least one kind of carboxylic acid ions is selected from the group consisting of pentanoic acid ions, heptanoic acid ions, methylbutanoic acid ions, and ethylbutanoic acid ions.

### Claim 9 (depends on 1)

The cold storage medium according to claim 1, wherein
the cold storage medium has a melting point of not less than 3 degrees Celsius and not more than 10 degrees Celsius.

### Claim 10 (depends on 9)

The cold storage medium according to claim 9, wherein
the cold storage medium has a melting point of not less than 4 degrees Celsius and not more than 7 degrees Celsius.

### Claim 11 (depends on 9)

The cold storage medium according to claim 9, wherein
the following mathematical formula (II) is satisfied:
ΔT≤5 degrees Kelvin (II)
where
ΔT represents a temperature difference between the melting point of the cold storage medium and a temperature at which the cold storage medium under a supercooling state begins to crystallize spontaneously.

### Claim 12 (depends on 11)

The cold storage medium according to claim 11, wherein
ΔT is not more than 2 degrees Kelvin.

### Claim 13 (depends on 11)

The cold storage medium according to claim 11, wherein
the temperature at which the cold storage medium under the supercooling state begins to crystallize spontaneously is not less than 3 degrees Celsius and not more than 7 degrees Celsius.