Surfactants for polyurethane foams

Patent metadata

Field	Value
Publication number	US-10457770-B2
Application number	US-201415533391-A
Country	US
Kind code	B2
Filing date	Dec 17, 2014
Priority date	Dec 17, 2014
Publication date	Oct 29, 2019
Grant date	Oct 29, 2019

Abstract

A surfactant and a method of forming the surfactant having the formula (I) where a is an integer from 1 to 10, b is an integer from 0 to 10, R 1 is —CH 3 or —H, n is an integer from 0 to 20, and R 2 is a moiety selected from the group consisting of (II), (III), (IV), (V), (VI), (VII) or (VIII) where m is an integer from 0 to 4. The surfactant can be used in a method for preparing a rigid polyurethane foam.

First claim

The invention claimed is:

1. A surfactant having the formula:

where a is an integer from 1 to 10, b is an integer from 0 to 10, R 1 is —CH 3 or —H, n is an integer from 1 to 20, and R 2 is a moiety selected from the group consisting of:

where m is an integer from 0 to 4.

2. The surfactant of claim 1 , wherein the formula is:

3. The surfactant of claim 1 , where the formula is:

4. The surfactant of claim 1 , where a is an integer from 5 to 7, b is an integer from 2 to 10 and R 1 is —H.

5. The surfactant of claim 4 , where a is 7.

6. The surfactant of claim 1 , wherein based on the total weight of the surfactant, the surfactant has 0.1 weight percent (wt. %) to 50 wt. % fluorine (F) and 3 wt. % to 25 wt. % isocyanate.

7. A method for preparing a rigid polyurethane foam, comprising:
using carbon dioxide to provide a pressure at a first predetermined value on a polyol mixture that includes a polyol, a catalyst and a surfactant a provided in claim 1 ;
maintaining the pressure at the first predetermined value for a first predetermined time;
mixing an isocyanate with the polyol mixture to form a polyurethane reaction mixture;
optionally maintaining the pressure on the polyurethane reaction mixture at the first predetermined value for a second predetermined time;
increasing the pressure on the polyurethane reaction mixture from the first predetermined value to a second predetermined value greater than the first predetermined value; and
releasing the polyurethane reaction mixture at a predetermined depressurization rate from the pressure after a third predetermined time to prepare the rigid polyurethane foam, where the third predetermined time is less than 30 minutes.

Assignees

• Dow Global Technologies Llc

Inventors

• Xiong Jiawen
• Li Dachao
• Zhang Jianxin
• Guo David Hong-Fei
• Wang Beilei
• Liu Wei

Classifications

• C08J9/122

  Hydrogen, oxygen, CO2, nitrogen or noble gases · CPC title

• C08K5/02

  Halogenated hydrocarbons {(C08K5/0091 takes precedence)} · CPC title

• C08G18/1808 Primary

  having alkylene polyamine groups · CPC title

• C07C271/06

  Esters of carbamic acids · CPC title

• C08G18/7664

  containing alkylene polyphenyl groups · CPC title