Veba-chemie Aktiengesellschaft

Chemische Werke Huls Aktiengesellschaft

Chemische Werke Huels Aktiengesellschaft

Johann Obendorf

Rainer Gras

Elmar Wolf

Felix Schulde

Kurt Neubold

Gunter Dormann

Siegfried Brandt

Volker W Kulisch

Fritz Gude

Storage stable epoxy resin powder coating compositions are disclosed, which contain a solid epoxy resin and, as hardening agent, a blocked polyisocyanate compound or isocyanate terminated polymer, wherein the blocking agent is an imidazoline compound.

Powdery coating media and their use

Powdered, heat-hardenable coating materials with high storage stability and a grain size smaller than 0.25 mm based upon hydroxy-group-containing polyesters with melting points between 40.degree. and 120.degree. C., blocked polyisocyanates and optionally catalysts, wherein the coating material contains polyisocyanates blocked with cyclic amidines of the general formula ##STR1## wherein R=equal or different substituents selected from the group consisting of hydrogen, alkyl-, cycloalkyl-, aralkyl-, and alkyl radicals. A method for the production of the above mentioned coating materials and a process for coating substrates with these materials is also disclosed.

Coating materials and their application prepared from polyisocyanates

An improvement for producing a coating from a powder lacquers composition comprising at least one 1,2-epoxide compound having at least one 1,2-epoxide group in the molecule which compound has a lower melting point greater than 40.degree. C., and dicyandiamide wherein the powder coating lacquer composition additionally contains an imidazoline derivative of the general structure ##STR1## wherein R is hydrogen, an alkyl or aryl residue, R' is a cycloalkyl, heterocyclo alkyl or R, R' is an alkyl or aryl substituted or unsubstituted alkylene or arylene, X is hydrogen or a radical having the following structure ##STR2##

Process of hardening epoxy coating composition with

Baking lacquers on the basis of a blend of hydroxy-group-containing polymers, blocked polyisocyanates and organic solvents which comprise

Storage-stable baking lacquers prepared from polyisocyanates blocked

A method for the coating of glass surfaces in order to prevent the scattering of glass particles upon bursting, with a transparent, duroplastic protective coat by depositing a paste of hydroxy group-containing 1,2-epoxy compounds with at least one 1,2-epoxide group in the molecule and a lower melting point of more than 40.degree. C. and hardening agents, and hardening the overlay at higher temperatures; which comprises first treating the clean glass surface with an aqueous or alcoholic silane skim coat, drying said surface if necessary and thereafter warming said surface to a temperature up to 120.degree. C., coating the glass surface with said paste of hydroxy group containing 1,2-epoxy compounds and hardening said paste with further addition of heat, wherein said hardening agents are polyisocyanates blocked with cyclic amidines of the general formula ##STR1## wherein the R's are the same or different substituents selected from the group consisting of hydrogen, alkyl-, cycloalkyl-, arylalkyl- and aryl, wherein the hardening agent is added in an amount of 2-15% by weight, calculated with respect to the amount of 1,2-epoxide compounds.

Method for the coating of glass surfaces

This invention relates to blocked isocyanates and to a method for making blocked isocyanates by blocking the isocyanate groups of a polyisocyanate, which may be chain extended, with a cyclic amidine compound of the formula ##STR1## where the R's are the same or different substituents inert to isocyanate groups.

Method of producing blocked polyisocyanates by reaction of an

A method of producing coatings on the basis of two-component systems composed of 1,2-epoxy compounds having at least one 1,2-epoxy group in the molecule, plus cyclic amidines and the conventional paint additives, which are thermosetting at 100.degree. to 200.degree. C, the said method being characterized in that one uses as cyclic amidines imidazoline or tetrahydropyrimidine derivatives of the general formula ##STR1## IN WHICH N EQUALS 2 OR 3; M EQUALS 1 OR 2; R.sub.1, R.sub.2 and R.sub.3 are identical or different, and represent hydrogen, alkyl, aryl, aralkyl, cycloalkyl, heterocyclics, ether, theoether, halogen, --N(R).sub.2, nitro groups, keto groups, ester groups or carbonamide groups, and R represents alkyl, alkylene, an aryl, aralkyl, cycloalkyl or heterocyclic radical, substituted if desired with halogen, nitro groups, alkyl groups, alkoxy groups or amino groups, and, when m equals 1, represents also hydrogen, a plurality of radicals being able to be joined, also by hetero atoms such as O, N or S, if desired.

Method of preparing coatings

Molding method and polyadducts for molding objects and coatings from 1,2-epoxy compounds having more than one epoxy group in the molecule and ureas having the formula: ##STR1## wherein N .gtoreq. 1,

Method for preparing moldings and coatings

Coatings having a matt finish are made by applying a powder varnish composition to a substrate and thereafter reacting the varnish at a temperature of 100.degree. to 240.degree. C to form the matt finish coating. The powder varnish composition is a finely divided, particulate mixture of

Method for making matt finish coatings

Coatings having a matt finish are made by applying a powder varnish composition to a substrate and thereafter reacting the varnish at a temperature of 100.degree. to 240.degree.C to form the matt finish coating. The powder varnish composition is a finely divided, particulate mixture of

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Dorsten, Germany

Johann Obendorf