EP0149643A1 - Compositions decapantes ameliorees pour peintures et leurs procedes de production et d'utilisation - Google Patents

Compositions decapantes ameliorees pour peintures et leurs procedes de production et d'utilisation

Info

Publication number
EP0149643A1
EP0149643A1 EP19840902674 EP84902674A EP0149643A1 EP 0149643 A1 EP0149643 A1 EP 0149643A1 EP 19840902674 EP19840902674 EP 19840902674 EP 84902674 A EP84902674 A EP 84902674A EP 0149643 A1 EP0149643 A1 EP 0149643A1
Authority
EP
European Patent Office
Prior art keywords
paint
composition
dry
equivalent
wax
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP19840902674
Other languages
German (de)
English (en)
Inventor
Victor N. Boccardo
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CMA CHEMICALS Inc
Original Assignee
CMA CHEMICALS Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by CMA CHEMICALS Inc filed Critical CMA CHEMICALS Inc
Publication of EP0149643A1 publication Critical patent/EP0149643A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D9/00—Chemical paint or ink removers

Definitions

  • the present invention relates to paint removal and, more particularly, to the stripping of paint and other finishes from automobiles prior to re-painting.
  • Automotive finishes can be removed by sanding and/or with the aid of chemical strip ⁇ pers.
  • a chemical stripper typically a liquid, or more usually, a semi-liquid thin paste, containing the active paint stripper is applied to the auto body to be stripped and allowed to stand until the paint has been lifted from the surface. This may require several hours or even standing overnight.
  • the paint is at its loosest, it is removed by scraping. This produces a messy deposit on the floor of the work place consisting of strips or scraps of paint film swollen with the still wet paint remover.
  • the primary novelty in the present invention resides in the discovery that the addition of from about 3 to about 10% by weight of certain dry, particulate, absorbent materials, such as diatomaceous earth, to the paint remover causes the formation, from the stripped paint and paint remover residue, of a dry, friable, easily removed mass, which can be handled without gloves or other protective clothing without irritation of the skin of the operator.
  • thickening agents which operate in combination with the diatomaceous earth or equivalent to produce the desired friable iry mass of paint and paint remover.
  • Various thickening agents known to the art per se and previously employed in the paint removers not containing a material providing a dry mass may be used. These include, among others, modified cellulose compositions such as Methocel, which may suitably have a viscosity of from about 2000 to about 6000 cps., preferably about 4000 cps. While not essential for all automotive finishes, it has been found that it is necessary to in ⁇ clude from about 1% to about 4% ammonia in the new com ⁇ positions in order to successfully remove lacquer type automotive finishes.
  • the ammonia may be added in any suitable form, but concentrated aqua ammonia is pre ⁇ ferred for ease of handling. Again, while ethanol is not an essential ingredient for some automotive finishes, it is necessary to add about 3 to about 6% to success ⁇ fully remove epoxy and urethane automotive finishes. Other optional, but desirable, ingredients are as follows: refined paraffin wax; mineral spirits or the equivalent and methanol.
  • the new paint removers have the following compositions.
  • the preferred active paint stripping agent methylene chloride
  • methylene chloride is commonly used for this purpose in chemical paint removers. While, less than about 70% methylene chloride may be used, if desired, there is a consequent loss of paint stripping effectiveness. It is preferred to use about 75 to about 78% to provide a com ⁇ position which will have the desired effectiveness. While more than 82% methylene chloride could be used, it has not been found necessary to do so, and such large amounts increase the rate of evaporation from the com ⁇ position, and consequently its odor.
  • the ethyl alcohol is not an essential ingredient, but is desirable, since it aids in the penetration of various paint surfaces, and particularly automotive lacquer finishes.
  • the aqua ammonia or its equivalent is an essential ingredient, particularly for lacquer removal, since it creates a bubbling effect in use which helps to lift the paint from the treated surface. While anhydrous ammonia, could be used, it is more convenient to handle aqua ammonia. Any suitable concentration of aqua ammonia
  • __. i > -. »* . may be used up to about 36° Baume' , which is an aqueous solution containing about 30% ammonia, by weight.
  • Other sources of ammonia may also be employed, such as organic amines. While somewhat more than about 8% aqua ammonia may be employed, it has not been found to be necessary and it is undesirable to add more water to the composition than is contained in that amount of aqua ammonia.
  • a thickening agent is added to lend body to the composition, not only to add in holding it in place on the surface to be treated, but to aid in the formation of the dry frangible mass.
  • Any suitable thickening agent known to the art may be employed. Modified cellulose available under the tradenames "Methocel” and “Cellosize” are suitable. Carboxymethylcellulose, methylcellulose and hydroxyethyl cellulose are also very effective.
  • the preferred thickening agent is hydroxypropylmethyl cellulose, suitably having a viscosity of about 4000 to about 5000 cps. While less than 1% thickening agent may be employed the resulting compositions are thin and difficult to use. More than 4% of the thickening agent may be used but is seldom necessary. Other thickening agents are operable at viscosities of from about 2000 to about 6000 cps.; 4000 cps. being preferred.
  • the methanol is also an optional, but desirable ingredient, since it swells the modified cellulose thicken ⁇ ing agent and enhances its thickening properties. Less than about 1% methanol may be used, but with reduced effect. More than about 4% methanol may also be used, but is seldom necessary, and would require labeling the composition as a poison.
  • Any suitable refined paraffin wax may be employed in amounts from about 1.5 to about 4% by weight.
  • the wax serves several functions, i.e., it reduces evaporation of the volatile ingredients and for this reason also reduces the odor of the ammonia.
  • the wax also forms a film after application of the paint stripp ⁇ ing composition to a surface to be treated.
  • SUD T_/ " :7 SHEET WIO " film aids in holding the other ingredients in place while the composition is working. While less than about 1.5% wax may be employed, such small amounts reduce control of evaporation. More than about 48%wax is undesirable, since it reduces the bubbling effect of the ammonia.
  • the mineral spirits are employed to dissolve the solid paraffin wax for addition to the liquid or semi-liquid composition.
  • the preferred mineral spirits are a hydrocarbon cut having a boiling point in the range from about 200°F. to about 400 ⁇ F.
  • Other wax solvents such as xylene or toluene, for example, may also be employed. From about 1% to about 5% wax solvent may be employed depending on the amount of wax used.
  • the solid wax is placed in the solvent in a con- tainer and the solvent is heated sufficiently to dissolve the wax; typically to about 130°F.
  • the most important ingredient and the one which is primarily responsible for the advantages of the new paint stripping compositions is a dry, inert, particulate absorbent material.
  • the preferred material for this purpose is diatomaceous earth. This material absorbs the paint remover and stripped paint, prevents the stripped paint from re-adhering to the treated surface and drys the mixture to form an easily removable, dry, frangible mass. Certain materials other than diatomaceous earth also serve this purpose, expanded perlite, for example. However, a number of commonly available absorbent particulate materials which might suggest themselves for this purpose are, in fact, inoperable. Such inoperable materials include saw dust, or wood flour, talc, bentonite, potato starch, and clay among many others.
  • diatomaceous earth for this purpose, those skilled in the art will be able to find other operable materials by routine trial and error, and, therefore, it is the con ⁇ cept which constitutes the invention and not the use of diatomaceous earth per se.
  • SUBST37 ⁇ 7 .a. « other operable absorbent is added to the paint remover in amounts of about 3 to about 5% by weight. Less than 3% may be employed, but with reduction in the desired properties of preventing re-adhesion of the paint and drying of the mixture to an easily removed frangible mass. More than 5% by weight of the absorbent may be used, but to do so is unnecessary to achieving the desired properties and, of course, reduces the pro ⁇ portion of active ingredients. As noted above, some of the ingredients are optional. However, three of the ingredients have been found essential to achieving the complete removal of an automotive finish as a dry frangible or friable mass easily separated from the treated surface. These essential ingredients, diatomaceous earth, thickener and ammonia, or their equivalents, work in combination to produce the novel properties of the new compositions.
  • the invention also includes the method of making the new compositions, since it has been found that the order of addition of at least some of the in ⁇ gredients is critical to achieving compositions having the desired properties.
  • the preferred method of making new compositions is as follows.
  • the methylene chloride is stirred in a suitable container with conventional blending equipment.
  • the wax is dissolved in the mineral spirits or other wax solvent by heating and melting the wax in the solvent.
  • the solution of wax and solvent is then added to the methylene chloride, slowly with continued stirring.
  • the hydroxypropylmethyl cellulose is slowly added followed by the diatomaceous earth or equivalent.
  • the aqua ammonia is added next, followed by the ethyl alcohol.
  • the methanol is then added as the last ingredient.
  • the new compositions may be applied to the sur- face to be treated by techniques known in the art, such as by brushing or rolling, or even spraying, if desired.
  • the new compositions lift the paint from the metal and dry in about 4 to about 6 hours, in most cases. If desired the compositions may be removed by scraping or wiping while still wet after the paint has been lifted.
  • the preferred practice is to apply the com- positions to the surfaces to be treated at the end of the work day and to let the composition work and dry overnight for removal in the morning. This leaves the remainder of the work day for le._ nishing the auto body.
  • the new compositions are very economical, since they are made from inexpensive ingredients, and usually only one gallon is needed to strip most automobiles.
  • SU2- - - 7 " . » • .- -.-ia-cT should be cut or chopped into small pieces to facilitate melting and solution. Heat the pot with occasional mild stirring, until the mineral spirits reach the melting point of the wax, i.e., about 130 ⁇ F., and continue stirr- ing until all of the wax has melted and dissolved.
  • the paint stripping composition of Example I is preferably poured onto the surface of an automobile to be stripped and brushed in one direction using an ordinary paint brush. Use about one gallon of the com ⁇ position to coat a full-sized automobile. Allow the paint stripper to stand in contact with the auto body for from 4 to 6 hours or preferably overnight, until the lifted paint and paint stripper is thoroughly dry to the touch.
  • any known active paint stripping ingredient other than the preferred methylene chloride may be used.
  • the ammonia may be supplied from any known source, other than the preferred, hydroxypropylmethyl cellulose.
  • diatomaceous earth is presently the preferred inert, particulate absorbent material, which provides the major advantages of the new compositions, the invention resides in the concept of using such a material in a paint stripper and any functional equivalent of the diatomaceous earth may be employed. Indeed, functional equivalents of any of the ingredients may be used, and any other ingredients commonly employed in such compositions may also be added so long as they do not alter the character of the claimed compositions.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Organic Chemistry (AREA)
  • Paints Or Removers (AREA)

Abstract

Nouvelles compositions décapantes pour peintures, leurs procédés de production et d'utilisation, utilisant des ingrédients décapants actifs conventionnels, en combinaison à des ingrédients auxiliaires, qui facilitent le détachage de la peinture d'une surface peinte, telle qu'une carrosserie d'automobile et qui permettent d'empêcher la réadhésion de la peinture, et de convertir le mélange de peinture/composition décapante en une masse sèche et friable s'éliminant aisément pour mettre à nu le substrat et produire des déchets secs facilement manipulables et jetables.
EP19840902674 1983-06-30 1984-06-26 Compositions decapantes ameliorees pour peintures et leurs procedes de production et d'utilisation Withdrawn EP0149643A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US50985983A 1983-06-30 1983-06-30
US509859 1983-06-30

Publications (1)

Publication Number Publication Date
EP0149643A1 true EP0149643A1 (fr) 1985-07-31

Family

ID=24028376

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19840902674 Withdrawn EP0149643A1 (fr) 1983-06-30 1984-06-26 Compositions decapantes ameliorees pour peintures et leurs procedes de production et d'utilisation

Country Status (2)

Country Link
EP (1) EP0149643A1 (fr)
WO (1) WO1985000373A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5188666A (en) * 1983-06-30 1993-02-23 Boccardo Victor N Paint removing compositions and methods for the manufacture and use thereof
US4801397A (en) * 1986-09-30 1989-01-31 W.M. Barr & Co., Inc. Peelable solvent-based coating remover
WO1989010271A1 (fr) * 1988-04-25 1989-11-02 Aga Aktiebolag Procede d'enlevage de peinture
FR2633633A1 (fr) * 1988-06-30 1990-01-05 Croses Richard Decapant neutre
DE4238627A1 (de) * 1992-11-16 1994-05-19 Wolff Walsrode Ag Methylhydroxypropylcelluloseether als Verdickungsmittel für Abbeizer

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA606626A (en) * 1960-10-11 B. Savage Albert Alkyl hydroxyalkyl cellulose ethers
NL262956A (fr) * 1960-03-31
US3666670A (en) * 1969-08-01 1972-05-30 Vulcan Materials Co Pulverulent drain cleaning composition
JPS5129733B2 (fr) * 1973-05-12 1976-08-27
US3920472A (en) * 1974-11-29 1975-11-18 Us Navy Decal removal method
US4370174A (en) * 1981-08-31 1983-01-25 Braithwaite Jr Charles H Method for removing adhesive residues with an emulsion cleaner

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8500373A1 *

Also Published As

Publication number Publication date
WO1985000373A1 (fr) 1985-01-31

Similar Documents

Publication Publication Date Title
US5188666A (en) Paint removing compositions and methods for the manufacture and use thereof
US4643840A (en) Paint stripper compositions
US5372742A (en) Nail polish remover
JP3452406B2 (ja) 有機系付着物の除去性能を有する組成物
US6010995A (en) No/low volatile organic compound cleaner/degreaser composition
US4594111A (en) Liquid phase cleaner-solvent
KR900003468B1 (ko) 염화메틸렌이 없는 페인트 스트리퍼(stripper)조성물
JPH06225848A (ja) 建造物外壁表面の清掃方法
EP0149643A1 (fr) Compositions decapantes ameliorees pour peintures et leurs procedes de production et d'utilisation
CA2331439C (fr) Decapant pour peinture et methode d'utilisation
EP0091194B1 (fr) Revêtement thixotrope enlevant la rouille et procédé
WO1992018600A1 (fr) Compositions nettoyantes contenant une faible quantite de composes organiques volatils et procedes d'utilisation
US4406707A (en) Method for removing vinyl decals
CA1229778A (fr) Compositions pour le decapage de la peinture, methodes de fabrication et d'utilisation
WO1990008165A1 (fr) Composition aqueuse polymere pour revetements protecteurs
US4801397A (en) Peelable solvent-based coating remover
US2827439A (en) Paint remover
CA1330288B (fr) Compositions pour le decapage de la peinture
JPH06256729A (ja) 壁紙リムーバー
US5904758A (en) Method for cleaning exterior surfaces of automotive vehicles
US4336072A (en) Method for removing vinyl decals
CA1252699A (fr) Methodes et compositions de traitement des surfaces de pierre
CA2012739A1 (fr) Composes pour l'enlevement d'enduits; procede de fabrication
JP2001139997A (ja) 碍子クリーナーおよびこれを用いた碍子洗浄スプレー
JPH0453633B2 (fr)

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): AT BE CH DE FR GB LI LU NL SE

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19850604

RIN1 Information on inventor provided before grant (corrected)

Inventor name: BOCCARDO, VICTOR, N.