DE925905C - Lacquers or their orders - Google Patents

Description

Lacquers or their orders Addendum to patent 901829 The patent gor 829 relates to lacquers or their orders: which contain polystyrene in the form of fine spheres or pearls.

It has now been found that paints of this type are particularly good good reflective effect if they use hydroxyl-containing polyesters as binders from polyhydric alcohols, e.g. B. hexanetriol, butanetriol, trimethylolpropane, z, 4.-Butylene glycol, e.g., 3-butylene glycol, and polybasic acids, e.g. B. phthalic acid, Adipic acid, sebacic acid, in conjunction with polyisocyanates, e.g. B. toluene diisocyanate, Contain hexamethylene diisocyanate or chlorophenylene diisocyanate.

Since craters often form in the film when such varnishes are applied, It is advisable to use small additions of other paint raw materials that the Compensate for surface tension in the film, e.g. B. copolymers of vinyl chloride with vinyl isobutyl ether. It is surprising that they used this invention Binder a particularly good and permanent fixation of the polystyrene beads in Painting. because other binders commonly used in the paint industry, such as urea resins, melamine resins and alkyd resins, in this case not satisfactory Give results.

Aluminum foils are primarily used as a base for the reflective coatings or bare aluminum sheet. You can also apply the varnish to other substrates apply and z. B. with an air-drying nitrocellulose combination paint or an oven-drying urea resin varnish prime the aluminum bronze as a pigment.

For colorless reflective coatings it is sufficient to apply the embedding varnish from resinous polyester and polyisocyanates and then the polystyrene To be applied in the known manner while the embedding lacquer film is still strong is adhesive. The solvents of the embedding varnish, such as ethylene glycol monomethyl ether acetate, Ethyl acetate, butyl acetate or acetone should largely have evaporated.

In the case of more colorful reflective coatings, it is advisable to apply the embedding varnish another combination lacquer, e.g. B. from nitrocellulose urea resin, applied, which is colored with soluble, lightfast dyes.

It is even possible in place of a metallic or metallic one - Acting substrate to use a paint application as a primer, which with inorganic or organic opaque pigments is pigmented. After covering this lacquer film with the isocyanate-containing embedding lacquer and introduction of the polystyrene beads colored coatings with a good reflective effect are also obtained.

Example After careful degreasing, an aluminum foil is applied a clear lacquer sprayed, which consists of 10 parts of dry Callodiumi% volde and 15 Parts of a urea resin composed.

This is followed by an application of lacquer from 40 parts of a polyester from 3 Moles of adipic acid, i Mo @ 1 hexanetriol and 3 moles of i, 3-butylene glycol and 16 parts Toluylerndiisocyan.at and 4 parts of a copolymer of vinyl chloride and Vinyl isobutyl ether. A mixture of methyl glycol acetate and Ethyl acetate in the ratio i: 4.

After the solvent has evaporated, an initially strong adhesive remains Lacquer film on which about 100 g / m² of polystyrene beads are sprinkled and pressed into place.

Claims (1)

PATENT CLAIM: Paints or their applications with polystyrene in the form of finer Beads or pearls according to patent goi 829, which act as binders for the beads or beads containing resinous hydroxyl groups, polyesters from polyhydric alcohols and polybasic acids and polyisocyanates. Referred publications: U.S. Patent No. 2,383,884; Angewandte Chemie, Edition A., 59th year, No. 9, P. 257 ff., Especially p. 263 bottom left.