Method of steam stripping dispersion of organic extender particles

Patent metadata

Field	Value
Publication number	US-10934371-B2
Application number	US-201616348623-A
Country	US
Kind code	B2
Filing date	Dec 22, 2016
Priority date	Dec 22, 2016
Publication date	Mar 2, 2021
Grant date	Mar 2, 2021

Abstract

A process of stripping a dispersion of organic extender particles with volatile organic compounds and a method of reducing volatile organic compounds.

First claim

What is claimed is:

1. A process of stripping a dispersion of core-shell organic extender particles with volatile organic compounds, comprising:
providing a dispersion of core-shell organic extender particles with volatile organic compounds, which particles comprise, when dry, one or more voids;
mixing the dispersion of core-shell organic extender particles with a binder comprising, as polymerized units, an acetoacetyl functional monomer, and having an average particle size of from 30 nm to 400 nm to form an aqueous polymer composition; and
steam stripping the aqueous polymer composition.

2. The process of claim 1 , wherein the dry weight ratio of the binder to the dispersion of core-shell organic extender particles is in the range of 5:95 to 90:10.

3. The process of claim 1 , wherein the binder has an average particle size of from 30 nm to 200 nm.

4. The process of claim 1 , wherein the binder further comprises adipic dihydrazide, oxalic dihydrazide, isophthalic dihydrazide, polyacrylic polyhydrazide, or mixtures thereof.

5. The process of claim 1 , wherein the binder is an acrylic emulsion polymer.

6. The process of claim 1 , wherein the binder has a glass transition temperature of from −50° C. to 100° C.

7. The process of claim 1 , wherein the core-shell organic extender particles comprises polymerized units of styrene in the shell.

8. The process of claim 1 , wherein steam stripping is a continuous or batch process.

9. The process of claim 1 , wherein steam stripping the aqueous polymer composition is conducted by
feeding the aqueous polymer composition and steam into a stripper under vacuum or under atmospheric pressure;
removing at least a portion of the volatile organic compounds from the aqueous polymer composition;
transferring the portion of the volatile organic compounds to the steam; and
separating the steam from the aqueous polymer composition.

Assignees

• Dow Global Technologies Llc
• Rohm & Haas

Inventors

• Qian Zhen
• Xu Jianming
• Maurice Alvin M
• Lin Daoshu
• Zhao Yaguang
• Yang Jiayuan
• Lv Han

Classifications

• Y02A50/20

  Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters · CPC title

• C08F6/003 Primary

  from polymer solutions, suspensions, dispersions or emulsions without recovery of the polymer therefrom · CPC title

• B01D19/0036

  Flash degasification (the other groups take precedence) · CPC title

• B01D19/0005

  with one or more auxiliary substances · CPC title

• B01D3/38 Primary

  Steam distillation · CPC title