Browse Prior Art Database

Stripping agent for chemically resistant coatings (USH0000300)

IP.com Disclosure Number: IPCOM000000299D
Original Publication Date: 1987-Jul-07
Included in the Prior Art Database: 2008-Mar-31
Document File: 4 page(s) / 556K

Publishing Venue

US Statutory Invention Registration (SIRs)

Related People

The United States of America as represented by the Secretary of the Navy: OWNER [+3]

Related Documents

USH000300: PATENT [+1]

Abstract

A low viscosity, non-foaming stripping composition comprising by volume 79% -methylpyrrolidone, 20% monoethanolamine and 1% non-ionic surface active agent is applied at elevated temperatures (around 180 degrees F.) for removing thick (e.g., 10-mil) epoxy coatings and similar chemically resistant coatings from steel surfaces, and is suitable for spray application and for recycling.

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United States Patent

USH0000300

Hearst

July 7, 1987


Stripping agent for chemically resistant coatings

Abstract

A low viscosity, non-foaming stripping composition comprising by volume 79% -methylpyrrolidone, 20% monoethanolamine and 1% non-ionic surface active agent is applied at elevated temperatures (around 180 degrees F.) for removing thick (e.g., 10-mil) epoxy coatings and similar chemically resistant coatings from steel surfaces, and is suitable for spray application and for recycling.


Inventors:

Hearst; Peter J. (Oxnard, CA)

Assignee:

The United States of America as represented by the Secretary of the Navy (Washington, DC)

Appl. No.:

06/928,777

Filed:

November 4, 1986


Current U.S. Class:

134/22.19 ; 510/212; 510/407; 510/500

Current International Class:

C09D 9/04 (20060101); C09D 9/00 (20060101); B08B 009/08 (); C11D 001/66 (); C11D 003/26 (); C23G 005/02 ()


Primary Examiner: Terapane; John F.
Assistant Examiner: Thomas; J. E.
Attorney, Agent or Firm:

Allahut; Louis St.Amand; Joseph M.


Claims



What is claimed is:
1. A low viscosity stripping composition, suitable for application by spraying at elevated temperatures, for the removal of chemically resistant coatings, the mixture comprising:
(a) 79 percent by volume of N-methylpyrrolidone;
(b) 20 percent by volume of ethanolamine; and
(c) 1 percent by volume of a non-ionic surface active agent for increasing penetration of the coating and without producing foam during spraying.
2. A stripping composition as in claim 1 wherein the surface active agent is a non-ionic detergent having high resistance to the alkaline environment caused by ethanolamine in the stripping composition.
3. A stripping composition as in claim 1 wherein the temperature at which said stripping composition is to be applied to chemical resistant coatings to be removed is at a range of 170 to 190 degrees F.
4. A stripping composition as in claim 3 wherein the preferred temperature is 180 degrees F.
5. The method for removing chemically resistant coatings from walls of bilges and tanks, comprising:
(a) spraying the chemically resistant coatings within said bilges and tanks with a stripping composition comprised by volume of approximately 79 percent N-methylpyrrolidone, 20 percent ethanolamine, and 1 percent of a non-ionic surface active agent;
(b) said stripping composition being applied by spraying onto said chemically resistant coatings to be removed at a temperature range of 170 to 190 degrees F.;
(c) removing the used said stripping composition along with removed coating material for recycling of the stripping composition.
6. A method as in claim 5 wherein said non-ionic surface active agent is a non-ionic detergent having high resistance to the alkaline environment caused by said ethanolamine in the stripping composition and not producing foam during spraying.
7. A method as in claim 5 wherein said non-ionic surface active agent is chosen to increase penetration and under...