Paint remover compositions comprising tetrahydrofuran, alkanediol, and amine and methods of making and using the same

Patent metadata

Field	Value
Publication number	US-12466966-B2
Application number	US-202519233985-A
Country	US
Kind code	B2
Filing date	Jun 10, 2025
Priority date	Mar 20, 2024
Publication date	Nov 11, 2025
Grant date	Nov 11, 2025

Abstract

A paint remover composition including (a) tetrahydrofuran (THF) at a sufficient concentration to remove paint; (b) a low vapor pressure (LVP) coupling co-solvent present at an effective amount to maintain miscibility of the single-phase paint remover composition and to remove paint; (c) an amine with a molar volume of <100 cm3/mol; and (d) water at a concentration of greater than 18 wt % of an overall concentration of the single-phase paint remover composition and the methods of making and using the same.

First claim

What is claimed is:

1 . A paint remover composition comprising:
(a) from 37 wt % to 49.5 wt % tetrahydrofuran (THF), based on the total weight of the composition; (b) from 1 wt % to 15 wt % a low vapor pressure (LVP) coupling co-solvent based on the total weight of the composition, the LVP coupling co-solvent comprising an alkanediol; (c) an amine with a molar volume of <100 cm 3 /mol; and (d) water at a concentration of greater than 20 wt % of an overall concentration of the paint remover composition.

2 . The composition according to claim 1 , wherein the LVP coupling co-solvent is 1,2-pentanediol or the LVP coupling co-solvent is 1,2-hexanediol, and wherein the LVP coupling co-solvent is present at a concentration of 2.5 wt % to 5 wt % of the overall concentration of the paint remover composition.

3 . The composition according to claim 1 , further comprising a secondary co-solvent.

4 . The composition according to claim 3 , wherein the secondary co-solvent is present at a concentration of 1 wt % to 10 wt % of the overall concentration of the paint remover composition.

5 . The composition according to claim 4 , wherein the secondary co-solvent is water miscible, and/or the secondary co-solvent is a glycol, a glycol ether, or a combination thereof.

6 . The composition according to claim 5 , wherein the secondary co-solvent is an alkylene glycol, an alkylene glycol ether, alcohol, or a combination thereof.

7 . The composition according to claim 6 , wherein the secondary co-solvent is propylene glycol, diethylene glycol monobutyl ether, or a combination thereof.

8 . The composition according to claim 4 , wherein the secondary co-solvent is propylene glycol.

9 . The composition according to claim 8 , wherein the LVP coupling co-solvent and the secondary co-solvent are present in the paint remover composition at a ratio ranging from 2:1 to 1:2 relative to one another.

10 . The composition according to claim 4 , wherein the secondary co-solvent is diethylene glycol monobutyl ether.

11 . The composition according to claim 10 , wherein the LVP coupling co-solvent and the secondary co-solvent are present in the paint remover composition at a ratio ranging from 2:1 to 1:2 relative to one another.

12 . The composition of claim 5 , wherein the secondary co-solvent includes at least one of propylene glycol or diethylene glycol monobutyl ether;
wherein the secondary co-solvent is present at a concentration of 2 wt % to 5 wt % of the overall concentration of the paint remover composition; and wherein the LVP coupling co-solvent and secondary co-solvent are present in the paint remover composition at a ratio ranging from 1.5:1 to 1:1.5 relative to one another.

13 . The composition according to claim 12 , wherein water is present in the paint remover composition at concentration ranging from greater than 20 wt % to 40 wt % of the overall concentration of the paint remover composition.

14 . The composition according to claim 13 , wherein water is present in the paint remover composition at concentration ranging from greater than 20 wt % to 27.5 wt % of the overall concentration of the paint remover composition.

15 . The composition according to claim 1 , further comprising a solvent evaporation retarder.

16 . The composition according to claim 1 , further comprising a cellulosic thickener.

17 . The composition according to claim 1 , further comprising an amine containing corrosion inhibitor.

18 . The composition according to claim 1 , wherein the paint remover composition remains stable and exhibits no phase separation at a temperature of 50° C. for twenty-eight (28) days.

19 . The composition according to claim 1 , wherein the paint remover composition has a viscosity ranging from 1,000 cP to 20,000 cP at 20° C.

20 . The composition according to claim 1 , wherein the LVP coupling co-solvent and water are present in the paint remover at a ratio ranging from 1:5 to 1:2 relative to one another.

21 . The composition according to claim 1 , wherein the ratio of LVP coupling co-solvent to THF ranges from 1:19.8 to 1:9.9.

22 . A method of making the paint remover composition of claim 1 , comprising:
(a) admixing from 37 wt % to 49.5 wt % tetrahydrofuran (THF), based on the total weight of the composition, with:
(i) from 1 wt % to 15 wt % of a low vapor pressure (LVP) coupling co-solvent comprising an alkanediol;
(ii) an amine with a molar volume of <100 cm 3 /mol; and
(iii) water at a concentration of greater than 20 wt % of an overall concentration of the paint remover composition; and
(b) forming the paint remover composition.

23 . A method of removing paint comprising:
(a) applying the paint remover composition of claim 1 to a painted surface for a predetermined time period; and (b) after step (a), removing paint from the painted surface.

24 . The method of claim 23 , wherein the predetermined time period ranges for 5 minutes to 300 minutes.

25 . The method of claim 23 , wherein the painted surface is a single coating of paint.

26 . The method of claim 23 , wherein the painted surface includes a plurality of paint coatings.

27 . The composition according to claim 14 , wherein the LVP coupling co-solvent is 1,2-pentanediol and/or the LVP coupling co-solvent is 1,2-hexanediol, and wherein the LVP coupling co-solvent is present at a concentration of 2.5 wt % to 5 wt % of the overall concentration of the paint remover composition.

28 . The composition according to claim 14 , wherein the LVP coupling co-solvent is 1,2-pentanediol, and wherein the LVP coupling co-solvent is present at a concentration of 2.5 wt % to 5 wt % of the overall concentration of the paint remover composition.

Assignees

• Wm Barr & Co Inc

Inventors

• Breon Jonathan
• Teague Tim
• Shireman Dennis

Classifications

• B08B3/08 Primary

  the liquid having chemical or dissolving effect · CPC title

• C09D9/005 Primary

  containing organic solvents · CPC title