Aprotic polar solvent/ether paint stripping compositions
AssigneeAtochem
InventorsJean-Pierre Lallier, Patrick Marie
Life of this patent
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Abstract
Inexpensive paint stripper compositions, containing neither chlorinated, aromatic nor alkaline solvents and well adopted for removing glycerophthalic, alkyd-urethane, acrylic-polyurethane and epoxy paints from a variety of substrates, e.g., wood and metal substrates, comprise (a) from 1% to 20% by volume of an aprotic polar solvent selected from among dimethylsulfoxide, dimethylformamide, N-methylpyrrolidone, N-methylmorpholine, .gamma.-butyrolactone, acetonitrile and mixtures thereof; and (b) from 99% to 80% by volume of an ether selected from among methyltert-butylether, diethylether, tert-amylmethylether, tetrahydrofuran, dioxane and mixtures thereof.
Claims13
A process for the removal of paint from a substrate coated therewith comprising contacting an effective stripping amount of a composition, which comprises (a) from 1% to 20% by volume of dimethylsulfoxide and (b) from 99% to 80% by volume of an ether selected from among methyl-tert-butylether, tert-amylmethylether, tetrahydrofuran, dioxane and mixtures thereof, with said paint coated substrate;
- allowing said paint to swell, form blisters and become detached;
- and removing at least a portion of said paint from said substrate.
A process for the removal of a glycerophthalic paint surface layer from a wood substrate coated therewith, comprising contacting such surface layer with an effective stripping amount of a composition comprising (a) from 1% to 20% by volume of dimethylsulfoxide and (b) from 99% to 80% by volume of an ether selected from among diethylether, methyltert-butylether, tert-amyl-methylether or mixtures thereof;
- allowing said paint to swell, form blisters and become detached;
- and removing at least a portion of said paint from said substrate.
A process for the removal of an alkyd-urethane paint surface layer from a wood substrate coated therewith, comprising contacting such surface layer with an effective stripping amount of a composition comprising (a) from 1% to 20% by volume of dimethylsulfoxide and (b) from 99% to 80% by volume of an ether comprises diethylether, methyl-tertbutylether, tert-amyl-methylether or mixtures thereof;
- allowing said paint to swell, form blisters and become detached;
- and removing at least a portion of said paint from said substrate.
A process for the removal of an alkyd-urethane paint surface layer from a wood substrate coated therewith, comprising contacting such surface layer with an effective stripping amount of a composition comprising from 99% to 80% by volume of tetrahydrofuran and from 1% to 20% by volume of a solvent selected from among dimethylsulfoxide, dimethylformamide, N-methyl-pyrrolidone, N-methyl-morpholine, .gamma.-butyrolactone, acetonitrile or mixtures thereof;
- allowing said paint to swell, from blisters and become detached;
- and removing at least a portion of said paint from said substrate.
A process for the removal of an acrylic-polyurethane paint surface layer from a metal substrate coated therewith, comprising contacting such surface layer with an effective stripping amount of a composition comprising (a) from 1% to 20% by volume of dimethylsulfoxide, and (b) from 99% to 80% by volume of an ether selected from among tetrahydrofuran, dioxane or mixtures thereof;
- allowing said paint to swell, form blister and become detached;
- and removing at least a portion of said paint from said substrate.
A process for the removal of an acrylic-polyurethane paint surface layer from a metal substrate coated therewith, comprising contacting such surface layer with an effective stripping amount of a composition comprising from 99to 80% by volume of tetrahydrofuran and from 1% to 20% by volume of a solvent selected from among dimethylsulfoxide, dimethylformamide, N-methyl-pyrrolidone, N-methyl-morpholine, .gamma.-butyrolactone, acetonitrile or mixtures thereof;
- allowing said paint to swell, from blisters and become detached;
- and removing at least a portion of said paint from said substrate.
A process for the removal of an epoxy paint surface layer form a metal substrate coated therewith, comprising contacting such surface layer with an effective stripping amount of a composition comprising from 99% to 80% by volume of tetrahydrofuran and from 1% to 20% by volume of a solvent selected from among dimethylsulfoxide, dimethylformamide, N-methyl-pyrrolidone, N-methyl-morpholine, .gamma.-butyrolactone, acetonitrile or mixtures thereof;
- allowing said paint to swell, from blisters and become detached;
- and removing at least a portion of said paint from said substrate.
Dependencies are inferred from the claim text.