Non-oxidizer particles

Patent metadata

Field	Value
Publication number	US-9682867-B2
Application number	US-201414892803-A
Country	US
Kind code	B2
Filing date	May 21, 2014
Priority date	May 24, 2013
Publication date	Jun 20, 2017
Grant date	Jun 20, 2017

Abstract

Particles containing a strong oxidizer (classified as PG I according to the standard test method of the UN Manual of Tests and Criteria, 5 th revised Edition, sub-section 34.4.1) and at least one other constituent, the amount and nature of the constituent(s) other than the strong oxidizer in the particles being such that the particles are classified as non-oxidizer according to the standard test method of the UN Manual of Tests and Criteria, 5 th revised Edition, sub-section 34.4.1. Process for the production of these particles.

First claim

The invention claimed is:

1. A process for the preparation of particles that comprise CaO 2 , comprising:
adding hydrogen peroxide to slaked lime to form crystals of CaO 2 ;
adding at least one other constituent to the slaked lime, the other constituent selected from the group consisting of magnesite and aluminum hydroxide; and
drying the CaO 2 crystals;
wherein the at least one other constituent is added to the slaked lime either before the hydrogen peroxide, or after addition of hydrogen peroxide but before drying the CaO 2 crystals, and
wherein the at least one other constituent is added in an amount effective to render the particles as non-oxidizers.

2. The process according to claim 1 , wherein the at least one other constituent is aluminum hydroxide.

3. The process according to claim 1 , wherein the particles are classified as non-oxidizer according to the standard test method of the UN Manual of Tests and Criteria, 5 th revised Edition, sub-section 34.4.1.

4. The process according to claim 1 , wherein the particles have a content of available oxygen between 6.0% and 9.0% by weight.

5. The process according to claim 2 , wherein the aluminum hydroxide does not alter the crystallization behavior of the CaO 2 .

6. A process for the preparation of particles that comprise CaO 2 , comprising:
adding hydrogen peroxide to slaked lime to form crystals of CaO 2 ;
adding at least one other constituent to the slaked lime, the other constituent selected from the group consisting of magnesite and aluminum hydroxide; and
drying the CaO 2 crystals,
wherein the at least one other constituent is added to the slaked lime either before the hydrogen peroxide, or after addition of hydrogen peroxide but before drying the CaO 2 crystals, and
wherein the at least one other constituent is added in an amount effective to render the particles to be classified as non-oxidizer according to the standard test method of the UN Manual of Tests and Criteria, 5 th revised Edition, sub-section 34.4.1, and,
wherein the particles have a content of available oxygen between 6.0% and 9.0% by weight.

7. The process according to claim 6 , wherein the at least one other constituent is aluminum hydroxide.

8. The process according to claim 7 , wherein the aluminum hydroxide does not alter the crystallization behavior of the CaO 2 .

Assignees

• Solvay

Inventors

• Clemens Joerg
• Rabe Jürgen H

Classifications

• A61Q5/08

  Preparations for bleaching the hair · CPC title

• A61K8/23

  Sulfur; Selenium; Tellurium; Compounds thereof · CPC title

• A61Q11/00

  Preparations for care of the teeth, of the oral cavity or of dentures; Dentifrices, e.g. toothpastes; Mouth rinses · CPC title

• A21D2/02 Primary

  by adding inorganic substances · CPC title

• C01F11/02 Primary

  Oxides or hydroxides (production of lime C04B2/00) · CPC title