IP Library › Granted Patent US 12,240,998
Granted Patent B1
US 12,240,998 · App. 18/627,582 · Granted Mar 4, 2025

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

Inventors: Jonathan Breon (Memphis, TN); Tim Teague (Nesbit, MS); Dennis Shireman (Memphis, TN)
Assignee: W. M. BARR & COMPANY, INC.
C09D9/005
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Quick Facts
Patent No.
US 12,240,998
App. No.
18/627,582
Granted
Mar 4, 2025
Kind
B1
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 cm 3 /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.

Claims (41)

1. A single-phase paint remover composition comprising:

(a) tetrahydrofuran (THF) at a sufficient concentration to remove paint up to 49.5 wt % of the overall concentration of the single-phase paint remover composition;

(b) a low vapor pressure (LVP) coupling co-solvent comprising an alkanediol, the LVP coupling co-solvent is present at a concentration of 1.5 wt % to 15 wt % of the overall concentration of the single-phase paint remover composition to maintain miscibility of the single-phase paint remover composition and to remove paint;

(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 single-phase paint remover composition, wherein a ratio of the LVP coupling co-solvent to THF ranges from 1:19.8 to 1:9.9.

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 single-phase 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 single-phase 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 single-phase 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 single-phase paint remover composition at a ratio ranging from 2:1 to 1:2 relative to one another.

12. The composition of claim 3 , 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 single-phase paint remover composition; and

wherein the LVP coupling co-solvent and secondary co-solvent are present in the single-phase 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 single-phase paint remover composition at concentration ranging from greater than 30 wt % to 40 wt % of the overall concentration of the single-phase paint remover composition.

14. The composition according to claim 13 , wherein water is present in the single-phase paint remover composition at concentration ranging from greater than 20 wt % to 27.5 wt % of the overall concentration of the single-phase 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 single-phase 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 single-phase 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 single-phase paint remover at a ratio ranging from 1:5 to 1:2 relative to one another.

21. A method of making the single-phase paint remover composition of claim 1 , comprising:

(a) admixing tetrahydrofuran (THF) at a sufficient concentration up to 49.5 wt % of the overall concentration of the single-phase paint remover composition to remove paint with a:

(i) a low vapor pressure (LVP) coupling co-solvent comprising an alkanediol, the LVP coupling co-solvent is present at a concentration of 1.5 wt % to 15 wt % of the overall concentration of the single-phase paint remover composition to maintain miscibility of the single-phase paint remover composition and to remove paint;

(ii) an amine with a molar volume of <100 cm 3 /mol; and

(iii) water at a concentration of greater than 2048 wt % of an overall concentration of the single-phase paint remover composition; and

(b) forming the single-phase paint remover composition, wherein a ratio of the LVP coupling co-solvent to THF ranges from 1:19.8 to 1:9.9.

22. A method of removing paint comprising:

(a) applying the single-phase 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.

23. The method of claim 22 , wherein the predetermined time period ranges for 5 minutes to 300 minutes.

24. The method of claim 22 , wherein the painted surface is a single coating of paint.

25. The method of claim 22 , wherein the painted surface includes a plurality of paint coatings.

26. 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 single-phase paint remover composition.

27. 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 single-phase paint remover composition.

28. The composition according to claim 1 , wherein THF is present at 49.5 wt % of the overall concentration of the single-phase paint remover composition.

Assignments (2)
SECURITY INTEREST Recorded Dec 10, 2025
From: W.M. BARR & COMPANY, INC.
To: FIFTH THIRD BANK, NATIONAL ASSOCIATION, AS AGENT
Reel/Frame 073906/0028 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jul 23, 2024
From: BREON, JONATHAN; TEAGUE, TIM; SHIREMAN, DENNIS
To: W.M. BARR & COMPANY, INC.
Reel/Frame 068057/0682 →
Continuity (1)
Provisional Application 63567584 · Mar 20, 2024
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Cited By (1)
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