Back to results
US 11,434,314 B2Granted
Method for preparing 2-cyanoethyl group-containing polymer
AssigneeLG Chem, Ltd.
InventorsYong Man Lee, Yoontae Hwang, Dong Hoon Park, Jin Young Ryu
Life of this patent
Estimating the term…
Abstract
A method for preparing a 2-cyanoethyl group-containing polymer is provided. The method can prepare a purified 2-cyanoethyl group-containing polymer with high purity even while a reduced amount of water was used during the purification process, thus reducing the amount of wastewater generated.
Claims9
A method for preparing a 2-cyanoethyl group-containing polymer comprising:
- reacting acrylonitrile and a hydroxyl group-containing compound under basic conditions in the presence of a catalyst including a caustic soda (NaOH), to form a crude product including a 2-cyanoethyl group-containing polymer, unreacted acrylonitrile, a metal salt, and a byproduct;
- and
- extracting the crude product with an extraction solvent including an organic solvent to form a purified 2-cyanoethyl group-containing polymer,
- wherein the organic solvent has a Hansen solubility parameter distance for the 2-cyanoethyl group-containing polymer of 6.8 or more,
- wherein the organic solvent has a Hansen solubility parameter distance for acetone of 13.0 or less,
- wherein the hydroxyl group-containing compound includes a polyvinyl alcohol-based polymer and the 2-cyanoethyl group-containing polymer is cyanoethyl polyvinyl alcohol,
- wherein the extraction is performed two to five times, and
- wherein the extraction further comprises extracting the crude product with water, or the extraction solvent includes a mixed solvent of the organic solvent and water.
5 more elements
Dependencies are inferred from the claim text.