Drain formulation for enhanced hair dissolution

Patent metadata

Field	Value
Publication number	US-10208273-B2
Application number	US-201615289490-A
Country	US
Kind code	B2
Filing date	Oct 10, 2016
Priority date	Sep 10, 2012
Publication date	Feb 19, 2019
Grant date	Feb 19, 2019

Abstract

The invention relates to drain cleaning compositions including relatively high concentrations of a hypochlorite oxidizing agent and a hydroxide (e.g., 4 to 12% and 2.5 to 10%, respectively. The composition further includes a surfactant (e.g., a surfactant blend, water, and exhibits a very high pH (e.g., at least 13). The composition is monophasic, even at high oxidizing and hydroxide concentrations. The surfactant may include a blend of an uncharged surfactant (e.g., an amphoteric surfactant or nonionic surfactant) and a charged surfactant (e.g., anionic, cationic, or a surfactant that becomes so under the high pH conditions of the composition). The ratio of charged to uncharged surfactant may be at least 1:10, e.g., from 1:10 to about 1:50.

First claim

The invention claimed is:

1. A drain cleaning composition consisting of:
(a) 4% to 12% by weight of a hypochlorite oxidizing agent;
(b) greater than 3% to 10% by weight of a hydroxide;
(c) a charged surfactant which is an anionic surfactant selected from the group consisting of coconut fatty acid, sodium lauryl sulfate, alkyl benzene sulfonate, and mixtures thereof; and
(d) an uncharged surfactant which is one or more amine oxides;
(e) water;
(f) optionally, one or more adjuvants selected from the group consisting of:

coloring agents, dyes, pigments, fragrances, opacifiers, corrosion inhibitors and any combinations thereof;
wherein a ratio by weight of charged surfactant to uncharged surfactant is from 1:12 to 1:50; and the composition is monophasic and viscoelastic and has a viscosity of at least 250 cP at 10/s, a zero-shear viscosity of at least 1000 cP at 25° C. and a critical shear rate of at least 1/sec.

2. The composition of claim 1 , wherein the hypochlorite oxidizing agent is sodium hypochlorite.

3. The composition of claim 1 , wherein the hydroxide is sodium hydroxide.

4. The composition of claim 1 , wherein the ratio by weight of charged surfactant to uncharged surfactant is from 1:12 to 1:30.

5. The composition of claim 1 , wherein the uncharged surfactant is two or more an amine oxides.

6. A drain cleaning composition comprising:
(a) 4% to 12% by weight of a hypochlorite oxidizing agent;
(b) greater than 3% to 10% by weight of a hydroxide;
(c) a charged surfactant selected from the group consisting of: coconut fatty acid, sodium lauryl sulfate, and alkyl benzene sulfonate and mixtures thereof;
(d) an uncharged surfactant insert which is one or more amine oxides; and
(e) water;
wherein the composition is monophasic and the ratio by weight of the charged surfactant to the uncharged surfactant is from 1:12 to 1:50.

7. The composition of claim 6 , wherein the hypochlorite oxidizing agent is sodium hypochlorite.

8. The composition of claim 6 , wherein the hydroxide is sodium hydroxide.

9. The composition of claim 6 , wherein the charged surfactant comprises a sodium lauryl sulfate.

10. The composition of claim 6 , wherein the charged surfactant comprises a linear alkyl benzene sulfonate.

11. The composition of claim 6 , wherein the composition has a pH of greater than 13.

12. A drain cleaning composition consisting essentially of:
(a) 4% to 12% by weight of sodium hypochlorite;
(b) greater than 3% to 10% by weight of sodium hydroxide;
(c) a charged surfactant which is an anionic surfactant selected from the group consisting of coconut fatty acid, sodium lauryl sulfate, alkyl benzene sulfonate, and mixtures thereof;
(d) an uncharged surfactant which is one or more amine oxides; and
(e) water;
wherein the composition is monophasic and the ratio by weight of the charged surfactant to the uncharged surfactant is from 1:12 to 1:30 and has a pH of greater than 13.

13. The composition of claim 12 , wherein a relaxation time of the composition is less than 0.1 s.

14. The composition of claim 12 , wherein a zero shear viscosity of the composition is at least 1000 cP and a critical shear rate is at least 1/s.

15. The composition of claim 12 , wherein a flocculation temperature of the composition is greater than 50° C.

Assignees

• Clorox Co

Inventors

• Khan Rashda
• Fritter Daniela
• Alcantara Lorinda
• Zhang Wenyu
• Helmer Miranda

Classifications

• C11D10/045

  based on non-ionic surface-active compounds and soap · CPC title

• C11D10/042

  based on anionic surface-active compounds and soap · CPC title

• C11D3/3956

  Liquid compositions · CPC title

• C11D3/30

  Amines; Substituted amines {; Quaternized amines} · CPC title

• C11D3/044 Primary

  Hydroxides or bases · CPC title