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Machine translation
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)
Applicants:
Inventors:
Priority Data:
2817027 19.04.1978 DE
Title (EN) PREPARATION PROCESS OF TRANSPARENT COATING POWDERS MADE WITH COPOLYAMIDES
(FR) PREPARATION PROCESS OF TRANSPARENT COATING POWDERS MADE WITH COPOLYAMIDES
Abstract: front page image
(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)