Cationic surfactant foam stabilizing composition

Patent metadata

Field	Value
Publication number	US-11679292-B2
Application number	US-202017789175-A
Country	US
Kind code	B2
Filing date	Dec 22, 2020
Priority date	Dec 30, 2019
Publication date	Jun 20, 2023
Grant date	Jun 20, 2023

Abstract

A foam stabilizing composition is disclosed. The composition comprises (A) a siloxane cationic surfactant comprising a cationic moiety having the formula Z 1 -D 1 -N(Y) a (R) 2−a , wherein Z 1 is a siloxane moiety, D 1 is a divalent linking group, R is H or an unsubstituted hydrocarbyl group having from 1 to 4 carbon atoms, subscript a is 1 or 2, and each Y has formula -D-NR 1 3 +, where D is a divalent linking group and each R 1 is independently an unsubstituted hydrocarbyl group having from 1 to 4 carbon atoms. The composition also comprises (B) an organic cationic surfactant comprising a cationic moiety having the formula Z 2 -D 2 -N(Y) b (R) 2−b , wherein Z 2 is an unsubstituted hydrocarbyl group, D 2 is a covalent bond or a divalent linking group, subscript b is 1 or 2, and R, Y, and subscript a, are defined above. An aqueous film-forming foam comprising the composition and method of using the same are also disclosed.

First claim

What is claimed is:

1. A foam stabilizing composition, comprising:
(A) a siloxane cationic surfactant having general formula (I):
[Z 1 -D 1 -N(Y) a (R) 2−a ] +y [X −x ] n   (I),

wherein Z 1 is a siloxane moiety; D 1 is a divalent linking group; R is H or an unsubstituted hydrocarbyl group having from 1 to 4 carbon atoms; each Y has formula -D-NR 1 3 + , where D is a divalent linking group and each R 1 is independently an unsubstituted hydrocarbyl group having from 1 to 4 carbon atoms; subscript a is 1 or 2; 1≤y≤3; X is an anion; subscript n is 1, 2, or 3; and 1≤x≤3, with the proviso that (x*n)=y; and
(B) an organic cationic surfactant having general formula (II):
[Z 2 -D 2 -N(Y) b (R) 2−b ] +y [X −x ] n   (II),

wherein Z 2 is an unsubstituted hydrocarbyl group; D 2 is a covalent bond or a divalent linking group; subscript b is 1 or 2; and each R, Y, superscript y, X, subscript n, and superscript x is independently selected and as defined above.

2. The foam stabilizing composition of claim 1 , wherein the siloxane moiety Z 1 has the formula:

where each R 3 is independently selected from R 2 and —OSi(R 4 ) 3 , with the proviso that at least one R 3 is —OSi(R 4 ) 3 ; where each R 4 is independently selected from R 2 , —OSi(R 5 ) 3 , and —[OSiR 2 2 ] m OSiR 2 3 ; where each R 5 is independently selected from R 2 , —OSi(R 6 ) 3 , and —[OSiR 2 2 ] m OSiR 2 3 ; where each R 6 is independently selected from R 2 and —[OSiR 2 2 ] m OSiR 2 3 ;
where 0≤m≤100; and where each R 2 is independently a substituted or unsubstituted hydrocarbyl group.

3. The foam stabilizing composition of claim 2 , wherein each R 3 is —OSi(R 4 ) 3 , where R 4 is independently selected and as defined above.

4. The foam stabilizing composition of claim 1 , wherein the siloxane moiety Z 1 has one of the following structures (i)-(iv):

5. The foam stabilizing composition of claim 1 , wherein: (i) D 1 is a branched or linear alkylene group; or (ii) D 1 has formula -D 3 -N(R 7 )-D 3 -, where each D 3 is an independently selected divalent linking group and R 7 is H or Y, where Y is independently selected and as defined above.

6. The foam stabilizing composition of claim 5 , wherein the divalent linking group D 1 has formula -D 3 -N(R 7 )-D 3 -, where each D 3 and R 7 are as defined above, and wherein: (i) each D 3 is an independently selected alkylene group having from 1 to 8 carbon atoms; (ii) R 7 is H; or (iii) both (i) and (ii).

7. The foam stabilizing composition of claim 1 , wherein in the siloxane cationic surfactant (A): (i) subscript a is 1; (ii) superscript y is 1; (iii) R is H; or (iv) any combination of (i)-(iii).

8. The foam stabilizing composition of claim 1 , wherein Z 2 is an alkyl group having from 6 to 18 carbon atoms.

9. The foam stabilizing composition of claim 1 , wherein D 2 is the covalent bond.

10. The foam stabilizing composition of claim 1 , wherein D 2 is the divalent linking group, and wherein the divalent linking group D 2 comprises a branched or linear alkylene group.

11. The foam stabilizing composition of claim 10 , wherein the divalent linking group D 2 has formula -D 4 -N(R 8 )-D 4 -, where each D 4 is an independently selected divalent linking group and R 8 is H or Y, where Y is independently selected and as defined above.

12. The foam stabilizing composition of claim 11 , wherein (i) each D 4 is an independently selected alkylene group having from 1 to 8 carbon atoms; (ii) R 8 is H; or (iii) both (i) and (ii).

13. The foam stabilizing composition of claim 1 , wherein in the organic cationic surfactant (B): (i) subscript b is 1; (ii) superscript y is 1; (iii) R is H; or (iv) any combination of (i)-(iii).

14. The foam stabilizing composition of claim 1 , wherein: (i) each D 1 is selected from —CH 2 CH(OH)CH 2 — and —HC(CH 2 OH)CH 2 —; (ii) each R 1 is methyl; (iii) each X is Cl and superscript x is 1; or (iv) any combination of (i)-(iii).

15. The foam stabilizing composition of claim 1 , comprising a weight ratio of the siloxane cationic surfactant (A) to the organic cationic surfactant (B) of from 1:10 to 10:1 (A:B).

16. The foam stabilizing composition of claim 1 , further comprising at least one additive selected from: (C) solvents; (D) surfactants other than components (A) and (B); (E) rheology modifiers; (F) pH control agents; and (G) foam enhancers.

17. An aqueous film-forming foam comprising the foam stabilizing composition of claim 1 .

18. A method of extinguishing a fire comprising contacting the fire with the aqueous film-forming foam of claim 17 .

Assignees

• Dow Silicones Corp
• Dow Global Technologies Llc

Inventors

• Liu Nanguo
• Wenzlick Zachary
• Harkness Brian
• Hannington Jon
• Miller Scott
• Witucki Gerald
• Dorvel Brian

Classifications

• A62D1/0071 Primary

  Foams · CPC title

• A62C99/0036

  using foam · CPC title

• C11D1/62

  Quaternary ammonium compounds · CPC title

• C11D1/645 Primary

  Mixtures of compounds all of which are cationic · CPC title

• C11D1/40

  Monoamines or polyamines; Salts thereof · CPC title