Hydrated crystalline form of 2-acrylamido-2-methylpropane sulfonic acid

Patent metadata

Field	Value
Publication number	US-10759746-B2
Application number	US-201816496031-A
Country	US
Kind code	B2
Filing date	Mar 19, 2018
Priority date	Mar 20, 2017
Publication date	Sep 1, 2020
Grant date	Sep 1, 2020

Abstract

The present invention also relates to a production method for this form of 2-acrylamido-2-methylpropane sulfonic acid and a preparation method for an aqueous solution A of a salt of this form of 2-acrylamido-2-methylpropane sulfonic acid, and the (co)polymer of this form of -acrylamido-2-methylpropane sulfonic acid.

First claim

The invention claimed is:

1. A hydrated crystalline form of 2-acrylamido-2-methylpropane sulfonic acid having a 2-theta powder X-ray diffraction diagram comprising peaks at 10.58°, 11.2°, 12.65°, 13.66°, 16.28°, 18.45°, 20°, 20.4°, 22.5°, 25.5°, 25.88°, 26.47°, 28.52°, 30.28°, 30.8°, 34.09°, 38.19°, 40.69°, 41.82°, 43.74°, and 46.04° degrees, all peak values being +/−0.1°.

2. A hydrated crystalline form of 2-acrylamido-2-methylpropane sulfonic acid according to claim 1 , wherein it presents a Fourier transform infrared spectrum comprising peaks at 3280 cm −1 , 3126 cm −1 , 1657 cm −1 , 1595 cm −1 , 1453 cm −1 , 1395 cm −1 , 1307 cm −1 , 1205 cm −1 , 1164 cm −1 , 1113 cm −1 , 1041 cm −1 , 968 cm −1 , 885 cm −1 , 815 cm −1 , and 794 cm −1 , all peak values being +/−8 cm −1 .

3. The hydrated crystalline form of 2-acrylamido-2-methylpropane sulfonic acid according to claim 1 , wherein it presents minimum ignition energy greater than 400 mJ.

4. The hydrated crystalline form of 2-acrylamido-2-methylpropane sulfonic acid according to claim 1 , wherein it presents 4 thermal phenomena with the Differential Scanning calorimetry technique at 70° C., 100° C., 150° C. and 190° C., all +/−10° C.

5. The hydrated crystalline form of 2-acrylamido-2-methylpropane sulfonic acid according to claim 1 , wherein it has a water/2-acrylamido-2-methylpropane sulfonic acid molar ratio of 1:1.

6. The hydrated crystalline form of 2-acrylamido-2-methylpropane sulfonic acid according to claim 3 , that presents minimum ignition energy greater than 500 mJ.

Assignees

• Spcm Sa

Inventors

• Favero Cédrick
• Kieffer Johann

Classifications

• C07C309/15 Primary

  the nitrogen atom of at least one of the amino groups being part of any of the groups [IMAGE cpc-sch-C07C-0975.gif], X being a hetero atom, Y being any atom · CPC title

• E21B43/26

  by forming crevices or fractures · CPC title

• C08F20/56

  Acrylamide; Methacrylamide · CPC title

• C07C309/21 Primary

  containing nitrogen atoms, not being part of nitro or nitroso groups, bound to the carbon skeleton · CPC title

• C07C303/44

  Separation; Purification · CPC title