C - Chemistry – Metallurgy – 09 – B
Patent
C - Chemistry, Metallurgy
09
B
C09B 67/24 (2006.01) D06P 1/00 (2006.01) D06P 1/651 (2006.01) D06P 3/16 (2006.01) D06P 3/24 (2006.01)
Patent
CA 2323489
A process for dyeing materials containing natural or synthetic polyamides is disclosed. The process includes immersing the materials to be dyed in a dye bath containing an acid dye. The pH of the dye bath is initially at a level that substantially inhibits the dye from being absorbed by the polymer. In accordance with the present invention, however, an acid producing composition is added to the bath which gradually reduces the pH of the bath and allows for uniform diffusion of the dye into the polymer. The acid producing composition of the present invention is a maleate ester, which, in one embodiment, is the reaction product of maleic acid or maleic anhydride and a glycol.
La présente invention concerne un procédé permettant de teindre des matières à base de polyamides naturels ou de synthèse. Le procédé consiste à plonger les matières à teindre dans un bain de teinture contenant une teinture acide. Le pH du bain de teinture est initialement à un niveau qui empêche sensiblement le polymère d'absorber la teinture. Selon l'invention, toutefois, on ajoute au bain une composition produisant de l'acide, ce qui fait baisser le pH du bain et permet la diffusion uniforme de la teinture dans le polymère. La composition productrice d'acide de l'invention est un ester de maléate qui, selon une réalisation, est le produit de réaction de l'acide malique ou de l'anhydride malique avec un glycol.
Bella Otto
Login Robert B.
Wicker Calvin M. Jr.
Lanxess Corporation
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
Sybron Chemicals Inc.
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