1,1,1,2,2-pentafluoro-3,3-dichloro-propane and methyl...

C - Chemistry – Metallurgy – 11 – D

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134/31

C11D 7/50 (2006.01) C11D 7/28 (2006.01) C23G 5/028 (2006.01)

Patent

CA 2040980

PRECIS DE LA DIVULGATION: Pour remplacer les compositions de nettoyage à base de 1,1,2-trichloro-1,2,2-trifluoroéthane(F113), l'invention propose une composition comprenant en poids 55 à 80% de 1,1,1,2,2-pentafluoro-3,3-dichloro propane (225 ca) et 45 à 20% de méthyl tert-butyl éther. Ces deux composés forment un azéotrope négatif (Eb. = 59,9 C à la pression normale). La composition, éventuellement stabilisée, peut être utilisée pour le nettoyage de surfaces solides, en particulier pour le défluxage des circuits imprimés et pour le dégraissage de pièces mécaniques.

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