# US 8,772,506 B2 · 1,3-diiodohydantoin compound and production method thereof

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- Number: US 8,772,506 B2
- Document ID: US8772506B2
- Status: Granted
- Kind: B2
- Application number: 12/926,900
- Filed: 2010-12-16
- Published: 2011-04-21
- Granted: 2014-07-08
- Earliest claimed: 2005-09-02
- Assignees: Nippoh Chemicals Co., Ltd.
- Applicants: Kazuhisa Inoue; Yukihiko Hanamura; Takaaki Miyazawa
- Inventors: Kazuhisa Inoue; Yukihiko Hanamura; Takaaki Miyazawa
- Web page: https://patentgrep.com/patent/US8772506B2

## CPC

- C07D 233/82: Halogen atoms
- C07D: HETEROCYCLIC COMPOUNDS (macromolecular compounds C08)

## Abstract

The present invention provides a means which can inhibit release of I2 in production or storage of 1,3-diiodohydantoin compound, and thereby solve decrease in purity of the compound and various problems caused by I2. The present invention provides a production method for 1,3-diiodohydantoin compound comprising a step to prepare a wet body containing a 1,3-diiodohydantoin compound, and (1) a step to dry the wet body by contacting the wet body with heated gas or (2) a step to lyophilize the wet body, a storage method for 1,3-diiodohydantoin compound comprising a step to store a 1,3-diiodohydantoin compound under a temperature condition of 15° C. or lower, and a 1,3-diiodohydantoin compound wherein content of released I2 is 1% by mass or less.

## Claims

### Claim 1

A production method for 1,3-diiodohydantoin compound, comprising:
a step to prepare a composition comprising a 1,3-diiodohydantoin compound, and
a step to dry the composition by contacting the composition with a heated gas to inhibit release of I2 from the 1,3-diiodohydantoin compound so that a content of released I2 of the 1,3-diiodohydantoin compound is 1% by mass or less and a content of water of the 1,3-diiodohydantoin compound is 6% by mass or less,
wherein the composition is contacted by flowing with the heated gas, and
wherein a flow rate of the heated gas in contact with the composition is 0.1 to 10.0 m/sec.

### Claim 2 (depends on 1)

The production method according to claim 1, wherein the 1,3-diiodohydantoin compound is 5,5-dimethyl-1,3-diiodohydantoin.

### Claim 3 (depends on 1)

The production method according to claim 1, wherein a temperature of the heated gas is 20 to 200° C.

### Claim 4 (depends on 1)

The production method according to claim 1, wherein the step to dry the composition is performed under ordinary pressure.