AU633747B1

AU633747B1 - Composition for removing paint coatings from substrates

Info

Publication number: AU633747B1
Application number: AU80293/91A
Authority: AU
Inventors: Friedrich Volker Beutelrock
Original assignee: BEUTELROCK CAROLIN
Current assignee: BEUTELROCK CAROLIN
Priority date: 1990-02-15
Filing date: 1991-07-09
Publication date: 1993-02-04
Anticipated expiration: 2011-07-09
Also published as: JPH055070A; EP0442271A1; DE4004630A1; DE59105541D1; EP0442271B1; ATE123050T1

Abstract

A paint remover additionally using water, having a high activity and without endangering health is characterised in that it contains a) a di-, tri- and/or tetraethylene glycol and/or dipropylene glycol and/or at least one C1-4-mono- or C1-4-diether and/or mono- or diacetic acid ester and/or C1-4-monoether acetic acid ester thereof, b) N-methyl-2-pyrrolidone and c) at least one surfactant and is essentially free from water. y

Description

II

633747 S F Ref: 186157

AUSTRALIA

PATENTS ACT 1990 COMPLETE SPECIFICATION FOR A STANDARD PATENT 00 o orr o o o 0000 0 0 00 0 0 0a o Or) 0 0 0 0 0 00 0 0a On 0

ORIGINAL

000o0 0 a 04 4 Name and Address of Applicant: Carolin Beutelrock Untertrave 105 2400 Lubeck FEDERAL REPUBLIC OF GERMANY Friedrich Volker Beutelrock Actual Inventor(s): Address for Service: Invention Title: Spruson Ferguson, Patent Attorneys Level 33 St Martins Tower, 31 Market Street Sydney, New South Wales, 2000, Australia Composition for Removing Paint Coatings from Substrates The following statement is a full description of this invention, including the best method of performing it known to me/us:- 5845/3 P4004630.3 Nort4.or 1 Composition for Removing Paint Coatings from Substrates In many towns, particularly in cities, paint sprayings, so-called "graffiti", are appearing to an increasing extent on public and private buildings and also on vehicles, particularly on railways and underground railway carriages. Although, on the one hand, graffiti have developed into an art form of its own and are often desirable for improving the appearance of depressing urban concrete districts, daubs, devoid of any art, which are to be found predominantly in towns as well as social and political words, are on the other hand, to be regarded as fouling the image of the town. To remove such paint sprayings from 00 o" spray guns, officialdom and house owners have to spend large sums every 0 0 year in order to bring buildings and railway and underground railway 00 o carriages back to their original condition. Not only that, but because of the penetration of the sprayed paint into the surface pores of buildings, irreparable damage often occurs, which can only be removed o by expensive coatings which, in turn, considerably harm the visual appearance of a building.

To remove paint sprayings from buildings, railway carriages or o underground railway carriages use is made of different ordinary commercial cleaning agents, but these are generally of poor effect and leave behind paint residues which have to be painted over, involving expense, or else the cleaning agents contain volatile organic solvents which, when inhaled, may lead to danger to health.

r The basic task of the invention thus consists of finding a composition for the removal of paint, using at the same time water, which has an increased efficiency, and which cannot cause any danger to health.

The composition of the invention\d in t a) a di-, tri- and/or tetraethyleneglycol, and/or dipropylenegylcol, and/or at least one C 1 I. -mono or C14 -diether, and/or mono- or diacetic acid ester, and/or a C 1 lj- monoetheracetic acid ester of the same, 2C I nL 0 2 -2b) N-methyl-2-pyrrolidone, and c) at least one surfactant, and is essentially anhydrous.

Mixtures of this kind prove to be extremely effective for the removal of paint sprayings even on porous substrates and, in particular, from smooth substrates, for example those whose pores are closed by a coating agent.

The compositions of the invention are mobile and capable of being diluted by water, although they are essentially anhydrous. In use they are within the field of substances applied for the removal of paint.

O After a short period of action, for example after 1 minute, they allow the dissolved-out or swollen paint to be rinsed off with water, where S 15 necessary with the help of sponges or brushes. Application of the composition can be by spraying, brushing or by other usual means.

The composition of the invention is neutral, and thus does not attack the substrate. It contains biologically degradable constituents and is neither dangerous to health nor irritating to the skin or mucous membrane, and on contact with the skin can easily be removed by water.

As component the monoethers of diethylene glycol or dipropylene glycoJ are preferred, in particular the monomethyl ether or monoethyl ether of diethylene glycol.

As the surfactants, all of them may in principle be considered which have an adequate surface active effect, namely anionic, cationic or non-ionic surfactants. Particularly favoured are anionic and/or non-ionic surfactants. Examples of anionic surfactants, which come under consideration here are soaps, carboxylates, sulphonates and sulphates with alkyl or alkylaryl groups such alkylbenzenesulphonate.

Non-ionic surfactants which may be considered are for example ethers, particularly polyglycolether with alkoxy, alkylaryloxy, alkylamino, acyloxy, acylamino, acyl and alkyl groups, in particular fatty alcoholpolyglycolether. The ratios of the amounts of the components a) to c) can easily be arranged optimally through a series of tests, depending upon the use 3 to 12, better still better still 2 to 4 pb 3 in view. Preferential ratios of amounts lie at 6 to 10 pbw of component b) and at 0.5 to w of component c) per 100 pbw of component a).

09 o o 0 0 0 00 0 0 0 0 o9 0 D9 Q 0 0050 o 00 0 0 0 0 09 0 4 It t Since, the removal of graffiti more or less vertical surfaces have to be cleaned, on which mobile cleaning agents run, giving rise to shortened action, it is advisable to add a thickening agent to the composition which makes the mixture as a whole pasty or gel-like, and thus allows bonding to vertical surfaces so that the action time can be selected as required. Since the cleaning agents according to the invention are essentially anhydrous, thickening agents of this kind must be of an organic nature and may be, for example, agar-agar, carrageen, tragacanth, gum arabic, alginates, pectins, polyoses, guarmeal, carob tree meal, starches, dextrins, gelatins, casein, 15 carboxymethyl cellulose, cellulose ether, polyacrylic and polymethacrylic compounds, vinyl polymers, polycarboxylic acids, polyethers, polamines or polamides. Since these thickening agents must, on the one hand, be soluble in component a) and, on the other hand, be capable of washing off with water, hydroxy CI 4 -alkyl celluloses are preferably used as the thickening agent, and better still hydroxypropyl cellulose or hydroxyethyl cellulose. These thickening agents are preferably used in an amount of 0.5 to 5, better still in an amount of 1 to 3, pbw per 100 pbw of component Paint removing agents thickened in this way according to the invention have a gel-like character and bond well during the period of action to vertical surfaces.

In addition the agents may also contain the usual constituents which are compatible with the above mentioned constituents such as odourants, e.g. terpenes, pigments or colorants.

EXAMPLES

Example 1 The following components were homogenously mixed together: Methyldiglycol(2-(2-Methoxyethoxy)-ethanol)...................82.8pbw 6.8pbw Orange cerpene 8.0 pbw S- 4i Ordinary commercial surfactant mixture of anionic and non-anionic surfactants 2.4 pbw The mixture was evenly applied to the outside wall of a railway carriage sprayed with graffiti. After an action of 1 minute and within the aid of a brush and while spraying with much water, the coating of paint was removed. No residues of paint remained. The wall of the carriage was not attacked by the cleaning agent.

Example 2 A mixture was prepared from the following constituents: Methyldiglycol(2-(2-Methoxyethoxy)-ethanol)...................81.6pbw o, 6.7pbw o Orange 7.9 pbw 15 Hydroxypropyl 1.4 pbw Surfactant mixture as in example 2.4 pbw 0 0 4 00 The constituents were then intimately mixed without the hydroxypropyl cellulose. Then, with the impeller running the hydroxypropyl cellulose was allowed to run in. It was mixed long enough for a clear solution to be formed free of lumps. The solution o was left to stand overnight and then decanted. It had a gel-like character and bonded well io the vertical surfaces of the railway 04 carriage to be cleaned. As in example 1, the rinsing with water after an action time of 1 to 2 minutes gave a surface free of paint which showed no damage.

00 0

Claims

1. A composition for removing paint, with simultaneous use of water, comprising: a) a di-, tri- and/or tetraethyleneglycol, and/or dipropyleneglycol, and/or at least one C1-4 -mono or CI-4 -diether, and/or mono- or diacetic acid ester, and/or a C1- 4 monoetheracetic acid ester of the same, b) N-methyl-2-pyrrolidone and c) at least one surfactant and is essentially anhydrous.

2. A composition according to claim 1 which comprises 100 pbw of component 3 to 12 pbw of component b) and 0.5 to 5 pbw of component c).

3. A composition according to claim 1 or claim 2 which comprises 6 to 12 pbw of component b).

4. A composition according to any one of claims 1 to 3 which comprises 2 to 4 pbw of component c). A composition according to any one of claims 1 to 4 which further comprises d) a thickening agent.

6. A composition according to claim 2 wherein said thickening agent is a hydroxy-C1- 4 -alkyl cellulose.

7. A composition according to claim 6 wherein said hydroxy-C 1 4 -alkyl cellulose is hydroxypropyl cellulose and/or hydroxyethyl cellulose.

8. A composition according to any one of claims 5 to 7 which comprises 100 pbw of component a) and 0.5 to 5 pbw of component d).

9. A composition according to claim 8 which comprises 1 to 3 pbw of component d). A composition according to any one of claims 1 to 9 wherein said surfactant is an anionic and/or non-anionic surfactant.

11. A composition for removing paint, with simultaneous use of water substantially as hereinbefore described with reference to any one of the Examples. 30 Dated this TWENTY-FIFTH day of NOVEMBER 1992 Carolin Beutelrock Patent Attorneys for the Applicant/Nominated Person SPRUSON FERGUSON f 1-1 ABSTRACT Composition for Removing Paint Coatings from Substrates A composition for the removal of paint, with simultaneous use if water, with a high degree of efficiency and without danger to health, is characterised in that it contains: a) a di-, tri- and/or tetraethyleneglycol, and/or dipropylenegylcol, and/or at least one Cj_ -mono or -diether, and/or mono- or diacetic acid ester, and/or a CI4- monoetheracetic acid ester of the same, b) N-methyl-2-pyrrolidone and o" o c) at least one surfactant and is essentially anhydrous. 0o 0 04 0 0 a0 S <1