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1. (WO1979000946) PREPARATION PROCESS OF TRANSPARENT COATING POWDERS MADE WITH COPOLYAMIDES
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1979/000946 International Application No.: PCT/DE1979/000029
Publication Date: 15.11.1979 International Filing Date: 17.03.1979
IPC:
C08G 69/46 (2006.01) ,C08J 3/12 (2006.01) ,C08K 3/36 (2006.01) ,C09D 177/00 (2006.01)
C CHEMISTRY; METALLURGY
08
ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
G
MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
69
Macromolecular compounds obtained by reactions forming a carboxylic amide link in the main chain of the macromolecule
46
Post-polymerisation treatment
C CHEMISTRY; METALLURGY
08
ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
J
WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H142
3
Processes of treating or compounding macromolecular substances
12
Powdering or granulating
C CHEMISTRY; METALLURGY
08
ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
K
USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES AS COMPOUNDING INGREDIENTS
3
Use of inorganic ingredients
34
Silicon-containing compounds
36
Silica
C CHEMISTRY; METALLURGY
09
DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
D
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
177
Coating compositions based on polyamides obtained by reactions forming a carboxylic amide link in the main chain; Coating compositions based on derivatives of such polymers
Applicants:
Inventors:
Priority Data:
281702719.04.1978DE
Title (EN) PREPARATION PROCESS OF TRANSPARENT COATING POWDERS MADE WITH COPOLYAMIDES
(FR) PREPARATION PROCESS OF TRANSPARENT COATING POWDERS MADE WITH COPOLYAMIDES
Abstract:
(EN) Improved process for preparing transparent coating powders from copolyamides ground into powder at a low temperature. These copolyamides contain at least 30% by weight of lauric lactam, as well as at least 10% by weight of aliphatic dicarboxylic acid groups containing from 4 to 12 carbon atoms and equivalent remains of aliphatic diamines with lateral chains or cyclic diamines containing from 4 to 12 carbon atoms; these copolyamides are obtained by hydrolytic lactamic polymerization. With a simplified method transparent powders are obtained which are particularly appropriate for coating metal pieces with a transparent coat: for this purpose, from 0.01 to less than 0.15% by weight of silicic acid in the form of powder, is added to the copolyamides before or after the grinding; this pulverulent silicic acid is obtained by grinding and should have a surface of 380 +- 30 m2/gr (measured according to the BET method), and the primary particles should have an average diameter of 7 nm; the silicic acid is obtained by precipitation, having already a surface of 190 +- 20 m2/gr and the average size of the primary particles being 18 nm. After grinding, the powder is dimensioned to the desired size of particles.
(FR) Au moyen d"un procede ameliore, l"on prepare des poudres de couchage transparentes a partir de copolyamides reduits a basse temperature en poudre. Ces copolyamides contiennent au moins 30% en poids de lactame laurique, ainsi qu"au moins 10% en poids de groupements d"acides dicarboxyliques aliphatiques contenant de 4 a 12 atomes de carbone et des restes equivalents de diamines aliphatiques a chaines laterales ou de diamines cycliques contenant de 4 a 12 atomes de carbone; ces copolyamides sont obtenus par polymerisation lactamique hydrolytique. Par une methode simplifiee l"on obtient des poudres transparentes qui se pretent particulierement bien a recouvrir des pieces metalliques d"une couche transparente: a cet effet, l"on adjoint aux copolyamides avant ou apres la mouture en quantite de 0,01 a moins de 0,15% en poids, rapporte aux copolyamides, d"acide silicique sous fore de poudre; cet acide silicique pulverulent s"obtient par mouture et doit presenter une surface specifique de 380 +- 30 m2/gr (mesuree selon la methode BET), ainsi qu"un diametre moyen des particules primaires de 7 nm; l"acide silicique obtenu par precipitation presentant deja une surface de 190 +- 20 m2/gr et la granulometrie primaires etant de 18 nm. Apres mouture la poudre est dimensionnee a la granulometrie voulue.
Designated States:
Publication Language: German (DE)
Filing Language: German (DE)