Stripping composition

Patent metadata

Field	Value
Publication number	US-9376578-B2
Application number	US-201013146175-A
Country	US
Kind code	B2
Filing date	Jan 21, 2010
Priority date	Jan 23, 2009
Publication date	Jun 28, 2016
Grant date	Jun 28, 2016

Abstract

A stripping composition that includes a dicarboxylic acid diester is described. The composition is useful and particularly efficient for stripping paint.

First claim

What is claimed is:

1. A stripping composition comprising:
a1) a dicarboxylic acid diester corresponding to the formula (I):
R 1 —OOC-A-COO—R 2   (I)

wherein
the R 1 and R 2 groups, which are identical or different, represent a linear or branched, cyclic or noncyclic, C 1 -C 20 alkyl, aryl, alkylaryl or arylakyl group

wherein A is branched and is selected from the group consisting of the A MG group of formula —CH(CH 3 )—CH 2 —CH 2 , the A ES group of formula —CH(C 2 H 5 )—CH 2 — and their mixtures, and

a2) at least one cosolvent other than an alcohol, wherein the cosolvent is selected from the group consisting of a dimethyl sulfoxide, a ketone, an ester, and mixtures thereof,
wherein the ester is 3-ethylethoxy propionate (EEP), 1-methoxy-2-propy acetate, benzyl acetate, an alkyl acetate, or methyl levilunate,

the ratio by weight of a2) to a1) being comprised between 5/50 and 30170,
b) at least one nonionic surfactant, wherein the nonionic surfactant is selected from the group consisting of a polyalkoxylated terpene, a sorbitan ester, an alkoxylated castor oil, an alkoxylated fatty amine, an alkoxylated tristyrylphenol and mixtures thereof,
c) optionally an anionic surfactant,
d) optionally an acid,
e) optionally an activator,
f) optionally water, and
g) optionally a thickener; and

wherein the composition comprises:
from 60% to 65% by weight of the dicarboxylic acid diester,
from 5% to 30% by weight of the cosolvent and
from 0.1% to 5% by weight of the nonionic surfactant;
wherein the resulting stripping composition can strip acrylic paint from a surface of a metal substrate at a rate faster than a stripping composition wherein A is linear.

2. The stripping composition as claimed in claim 1 , wherein the composition comprises:
a1) the dicarboxylic acid diester,
a2) the at least one cosolvent,
b) the at least one nonionic surfactant,
c) an anionic surfactant,
d) an acid,
e) an activator
f) water, and
g) a thickener.

3. The composition as claimed in claim wherein R1 and R2 are methyl groups.

4. The composition as claimed in claim 1 , wherein the anionic surfactant is an optionally polyalkoxylated phosphate ester, in or not in a salified form.

5. The composition as claimed in claim 1 , wherein the composition comprises from 0.5% to 5% by weight of an anionic surfactant.

6. The composition as claimed in claim 1 , wherein the acid is an organic add.

7. The composition as claimed in claim 1 , wherein the composition comprises from 1% to 5% by weight of acid.

8. The composition as claimed in claim 1 , wherein the activator is selected from the group consisting of methanol, ethanol and isopropanol.

9. The composition as claimed in claim 1 , wherein the composition comprises from 0.1% to 5% by weight of alcohol.

10. The composition as claimed in claim 1 , wherein the composition comprises at most 10% by weight of water.

11. The composition as claimed in claim 1 , wherein the composition comprises:
a1) from 60% to 80% by weight of the dicarboxylic acid diester,
a2) from 5% to 30% by weight of cosolvent selected from the group consisting of dimethyl sulfoxide, and an ester,
b) from 0.1% to 2% by weight of the polyalkoxylated terpene surfactant,
c) from 0.5% to 5% by weight of polyalkoxylated phosphate ester surfactant, in or not in a salified form,
d) from 1% to 5% by weight of acid,
e) from 0.1% to 5% by weight of methanol, and
f) from 0% to 10% by weight of water.

12. A method of stripping a coating present on a substrate, the method comprising applying the composition as claimed in claim 1 to the coating present on the substrate to strip the coating from the substrate.

13. The method as claimed in claim 12 , wherein the coating is a paint.

14. The composition as claimed in claim 1 , wherein the composition comprises 60% to 80% of the dicarboxylic acid diester.

15. The composition as claimed in claim 1 , wherein the ketone is selected from the group consisting of acetone, methyl ethyl ketone, cyclohexanone, γ-butyrolactone and butanone.

16. The composition as claimed in claim 1 , wherein the ester is 3 ethylethoxy propionate (EEP), 1-methoxy-2-propyl acetate, butyl acetate, benzyl acetate, or methyl levilunate.

17. The composition as claimed in claim 16 , wherein the ester is butyl acetate or benzyl acetate.

18. The composition as claimed in claim 1 , wherein the alkoxylated castor oil is an ethoxylated castor oil.

19. The composition as claimed in claim 1 , wherein the alkoxylated fatty amine is an ethoxylated fatty amine.

20. The composition as claimed in claim 1 , wherein the alkoxylated tristyrylphenol is an ethoxylated tristyrylphenol.

21. The composition as claimed in claim 1 , wherein the composition comprises 0.1% to 2% by weight of the nonionic surfactant.

22. The composition as claimed in claim 6 , wherein the organic acid is formic acid, acetic acid, oxalic acid or lactic acid.

23. The composition as claimed in claim 10 , wherein the composition comprises at most 5% by weight of water.

24. The composition as claimed in claim 11 , wherein the cosolvent is dimethyl sulfoxide or 3-ethylethoxy propionate (EEP).

25. The composition as claimed in claim 11 , wherein the acid is formic acid, acetic acid, oxalic acid, or lactic acid.

26. The composition as claimed in claim 1 , wherein the stripping composition can strip acrylic paint from a surface of a metal substrate in less than half the time it takes a stripping composition wherein A is linear.

Assignees

• Bourdette Arnaud
• Zanetto Jean-Emile
• Lasnet De Lanty Patrick
• Rhodia Operations

Inventors

• Bourdette Arnaud
• Zanetto Jean-Emile
• Lasnet De Lanty Patrick

Classifications

• C11D3/2068

  Ethers · CPC title

• C11D1/66

  Non-ionic compounds {(C11D1/002, C11D1/004, C11D1/008 take precedence)} · CPC title

• C11D3/2003

  Alcohols; Phenols · CPC title

• C11D3/201

  linear · CPC title

• C11D1/02

  Anionic compounds {(C11D1/002, C11D1/004, C11D1/008 take precedence)} · CPC title