Color changing paint removing composition containing methylene chloride
View Patent ↗A composition and related process for removing paint from a substrate in which the composition contains methylene chloride, an organic filler, a colorant, a thickening agent and an evaporation retardant.
1. A color changing composition for removing paint from a substrate, wherein the composition consists essentially of the following components:
A. from about 20.0 to about 60.0 percent by weight of methylene chloride;
B. from about 0.01 to about 1.0 percent by weight of a colorant;
C. from about 30.0 to about 50.0 percent by weight of starch;
D. from about 1.0 to about 7.0 percent by weight of an evaporation retardant; and
E. from about 0.1 to about 5.0 percent by weight of a thickening agent;
wherein the composition contains from zero to less than about 2.0 percent by weight free water and wherein the composition exhibits a color change to indicate that paint is removable from the substrate.
2. A composition as defined by claim 1 wherein the composition further comprises N-methyl-2-pyrrolidone.
3. A composition as defined by claim 1 wherein the composition further comprises a solvent selected from ethylene carbonate, propylene carbonate, ethyl alcohol, benzyl alcohol, furfuryl alcohol, tetrahydrofurfuryl alcohol, d-limonene, dimethyl sulfoxide, methyal or mixture thereof.
4. A composition as defined by claim 1 wherein the starch is potato starch, rice starch, corn starch or mixture thereof.
5. A composition as defined by claim 1 wherein the composition comprises from about 0.5 to about 2.0 percent by weight of an inorganic or organic thickening agent.
6. A composition as defined by claim 5 wherein the thickening agent is a silica, metallic silicate, clay, gum, polymer or mixture thereof.
7. A composition as defined by claim 5 wherein the thickening agent is hydroxypropyl methyl cellulose, hydroxypropyl cellulose or mixture thereof.
8. A composition as defined by claim 1 wherein the colorant is a pigment, dye or mixture thereof.
9. A process for removing paint from a substrate, wherein the process comprises treating the substrate with a composition which consists essentially of the following components:
A. from about 20.0 to about 60.0 percent by weight of methylene chloride;
B. from about 0.01 to about 1.0 percent by weight of a colorant;
C. from about 30.0 to about 50.0 percent by weight of starch;
D. from about 1.0 to about 7.0 percent by weight of an evaporation retardant; and
E. from about 0.1 to about 5.0 percent by weight of a thickening agent;
wherein the composition contains from zero to less than about 2.0 percent by weight free water and wherein the composition exhibits a color change to indicate that paint is removable from the substrate.
10. A process as defined by claim 9 wherein the composition further comprises N-methyl-2-pyrrolidone.
11. A process as defined by claim 9 wherein the composition further comprises a solvent selected from ethylene carbonate, propylene carbonate, ethyl alcohol, benzyl alcohol, furfuryl alcohol, tetrahydrofurfuryl alcohol, d-limonene, dimethyl sulfoxide, methyal or mixture thereof.
12. A process as defined by claim 9 wherein the starch is potato starch, rice starch, corn starch or mixture thereof.
13. A process as defined by claim 9 wherein the composition comprises from about 0.5 to about 2.0 percent by weight of an inorganic or organic thickening agent.
14. A process as defined by claim 13 wherein the thickening agent is a silica, metallic silicate, clay, gum, polymer or mixture thereof.
15. A process as defined by claim 13 wherein the thickening agent is hydroxypropyl methyl cellulose, hydroxypropyl cellulose or mixture thereof.
16. A process as defined by claim 9 wherein the colorant is a pigment, dye or mixture thereof.