CLEANING SOLUTION

• US 20190309178A1
• Filed: 06/13/2017
• Published: 10/10/2019
• Est. Priority Date: 06/14/2016
• Status: Active Grant

• Current Assignee: Sun Chemical Corporation
• Original Assignee: Sun Chemical Corporation
• Inventors: FOX, Jerome, SAVARMAND, Saeid
• Granted Patent: US 11,685,838 B2
• Time in Patent Office: Days
• CPC Class Codes: B08B 1/143 Wipes
• CPC Class Codes: B08B 3/08 the liquid having chemical or dissolving effect substances used, see the relevant classes
• CPC Class Codes: B41F 23/002 cleaning devices for sheets or webs
• CPC Class Codes: C09D 9/00 Chemical paint or ink removers fluid media for correction of typographical errors by coating C09D10/00
• CPC Class Codes: C09D 9/005 containing organic solvents
• CPC Class Codes: C11D 2111/20 Industrial or commercial equipment, e.g. reactors, tubes or engines
• CPC Class Codes: C11D 7/04 Water-soluble compounds
• CPC Class Codes: C11D 7/22 Organic compounds
• CPC Class Codes: C11D 7/248 Terpenes
• CPC Class Codes: C11D 7/26 containing oxygen
• CPC Class Codes: C11D 7/261 Alcohols; Phenols
• CPC Class Codes: C11D 7/263 Ethers
• CPC Class Codes: C11D 7/264 Aldehydes; Ketones; Acetals or ketals
• CPC Class Codes: C11D 7/266 Esters or carbonates
• CPC Class Codes: C11D 7/50 Solvents
• CPC Class Codes: C11D 7/5022 containing oxygen

Abstract

The present invention provides cleaning solutions for removing ink, coating, varnish, adhesive, etc. residue from printing equipment. The cleaning solutions of the present invention comprise one or more solvents, preferably selected from acetoacetates, alcohols, glycol ethers, glycol esters, terpenes, and water, and are preferably free of surfactants. The cleaning solutions of the invention have a relative evaporation time (RET) of less than 60 seconds, and a ratio of the RET to the radius of the sphere of solubility of the resin in the ink to be removed of less than 6.

Claims

1. A cleaning solution comprising one or more solvents selected from the group consisting of acetoacetates, alcohols, glycol ethers, glycol esters, terpenes, and water;

wherein

a) the cleaning solution is free of surfactants;

b) the relative evaporation time (RET) of the solvents is less than or equal to 60 seconds;

c) the ratio of RET of the solvents to the radius of the sphere of solubility of the resin (R) of the ink or coating to be removed is less than or equal to 6; and

wherein the cleaning solution removes residual inks and coatings from a surface.

2. The cleaning solution of claim 1, wherein the one or more acetoacetates are present in an amount of 10 wt % to 40 wt %, based on the total weight of the cleaning solution.

3. The cleaning solution of claim 1, wherein the one or more alcohols are present in an amount of 10 wt % to 40 wt %, based on the total weight of the cleaning solution.

4. The cleaning solution of claim 1, wherein the one or more glycol ethers are present in an amount of 10 wt % to 40 wt %, based on the total weight of the cleaning solution.

5. The cleaning solution of claim 1, wherein the water is present in an amount of 10 wt % to 40 wt %, based on the total weight of the cleaning solution.

6. The cleaning solution of claim 1, wherein at least one of the acetoacetates is ethyl acetoacetate.

7. The cleaning solution of claim 1, wherein at least one of the alcohols is diacetone alcohol.

8. The cleaning solution of claim 1, wherein the glycol ethers are independently selected from the group consisting of propylene glycol n-butyl ether (glycol ether PnB), ethylene glycol monobutyl ether (glycol ether EB), and dipropylene glycol methyl ether (glycol ether DPM).

9. The cleaning solution of claim 1, wherein at least one glycol ether is glycol ether PnB.

10. The cleaning solution of claim 1, which removes equal to or greater than 62.5% of the residual ink or coating from the surface.

11. The cleaning solution of claim 1, which is suitable for removing residual inks and coatings from lab, printing, mixing, and application equipment.

12. A method of removing residual inks and coatings from a surface comprising:

a) applying the cleaning solution of claim 1 on the surface;

b) allowing the cleaning solution to sit on the surface for a period of time sufficient to dissolve the residual ink or coating; and

c) wiping the cleaning solution off of the surface.

13. A method of formulating a cleaning solution comprising:

a) determining the radius of the sphere of solubility of the resin (R) of the ink or coating from the Hansen solubility parameters of the resin; and

b) mixing one or more solvents, each independently selected from the group consisting of acetoacetates, alcohols, glycol ethers, glycol esters, terpenes, and water, to produce a solvent blend, wherein;

i. the RET of the solvent blend is less than or equal to 60 seconds; and

ii. the ratio of RET to R is less than or equal to 6;

wherein the cleaning solution is free of surfactants; and

wherein the cleaning solution removes residual inks and coatings from a surface.