Coating processes – Removable protective coating applied
Patent
1999-05-28
2000-11-21
Cameron, Erma
Coating processes
Removable protective coating applied
427156, 4274071, 427409, 427421, B05D 102, B05D 138
Patent
active
061499706
DESCRIPTION:
BRIEF SUMMARY
This invention relates to aqueous coating media which are suitable for protecting high-quality merchandise, particularly for protecting the lacquer surface of motor vehicles, especially new vehicles during assembly, transport and storage for example. The coating media dry to form coatings which after use can easily be removed again as a foil-like film. The present invention also relates to a method of application of the coating media according to the invention.
Aqueous coating media for the purpose of protecting high-quality merchandise are known. New motor vehicles are coated with protective lacquers of this type during storage and transport, for example. These protective lacquers can easily be removed from the object again, for example by washing them off with appropriate cleaning solutions, or they can be stripped off as a foil which is generally disposed of by incineration.
Temporary aqueous coating media in the form of foils which can be stripped off after use are known. For example, they may be aqueous coating media based on copolymers which contain comonomers such as (meth)acrylonitrile or (meth)acrylamide. After use, the coatings which are formed are stripped off as a foil and burnt, whereupon toxic gases are evolved. Other examples include aqueous coating media based on copolymers which contain comonomers comprising groups which have been converted into anionic groups by amine neutralisation. The amines volatilise when the coating layers are dried.
Aqueous protective lacquers are known from WO 90 08 165 which can be stripped off as a foil-like film after performing their protective function. Their area of application is the temporary protection of very different parts of buildings from types of soiling which are typical of building operations during building works. These aqueous protective lacquers contain a polymer dispersion as a binder vehicle, which may comprise acrylate resins, polyvinyl alcohol, ethylene/vinyl acetate copolymers and copolymers of vinyl and acrylic comonomers, which may each be present on their own or in any desired mixture.
The object of the present invention is to provide aqueous coating media, which can be removed as a foil, for the protection of high-quality merchandise, particularly for the preservation of motor vehicles. The coating media should contain as few volatile organic substances as possible, and in particular they should satisfy the requirements in the motor vehicle industry, namely they should protect the lacquer surface of new vehicles, during assembly, transport and storage, from soiling and from the formation of water stains and from etched regions due to acid rain for example.
This object is achieved by the provision of an aqueous coating medium which contains, as binder vehicles in the form of aqueous polymer dispersions, one C2-C4 olefine and at least one vinyl ester of a C2-C11 monocarboxylic acid, wherein the olefine(s) and vinyl ester(s) are present in a ratio by weight of 10:90 to 40:60 and together make up at least 80% by weight of the copolymer, copolymers which are free from comonomers containing nitrite and amide groups, and at least 50% by weight of which consists of (meth)acrylic acid esters of C1-C18 alcohols, and and B), solids in each case and add up to 100% by weight.
Component A) of the aqueous coating medium according to the invention is an aqueous polymer dispersion based on a thermoplastic copolymer of at least one C2-C4 olefine and at least one vinyl ester of a C2-C11 monocarboxylic acid, wherein the olefine(s) and vinyl ester(s) are present in a ratio by weight of 10:90 to 40:60 and together make up at least 80% by weight of the thermoplastic copolymer. Examples of C2-C4 olefines include ethene, propene, butene-1, butene-2 and isobutene; ethene is preferred. Examples of preferred vinyl esters include vinyl acetate, vinyl propionate and vinyl versatate; vinyl acetate is particularly preferred. The versatates which can be used are vinyl esters of versatic acids. Versatic acids are trade names of the Shell company for strongly branched,
REFERENCES:
Patent Abstracts of Japan, vol. 006, No. 219 (C-132), Nov. 2, 1982 and JP 57 121067 A (Nippon Gosei Kagaku Kogyo KK), Jul. 28, 1982.
Patent Abstracts of Japan, vol. 011, No. 268 (C-444), Aug. 29, 1987 and JP 62 070461 A (Sakata Shokai Ltd), Mar. 31, 1987.
Karsten, Erich, Lackrohstofftabellen, Curt R. Vincentz Verlag, Hanover, 1992, 9th Ed., Sec. 9.2.2, p. 301 and Sec. 13.6.1, p. 363.
Bode Brigitte
Breidenbach Gerhard
Frigge Eva
Gutte Richard
Cameron Erma
Clariant GmbH
Herberts GmbH & Co. KG
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