New derivatives of 7-hydroxy-3-(1,2,4-oxadiazolyl-5) coumarin_

C - Chemistry – Metallurgy – 09 – B

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260/303, 8/52, 2

C09B 57/00 (2006.01) C07C 259/18 (2006.01) C07D 231/12 (2006.01) D06L 3/12 (2006.01)

Patent

CA 1060449

ABREGE DESCRIPTIF L'invention concerne de nouveaux dérivés de coumarine utilisables comme azurants optiques. Ils répondent à la formule générale: Image dans laquelle R1 représente un groupe alkyle possédant 1 à 5 ato- mes de carbone. éventuellement substitué par un substituant non ionogène et non chromophore. R2 représente un reste benzénique, styrylique ou hétérocyclique portant éventuellement un ou deux substituants non ionogènes et non chromophores. Ces composés conviennent très bien pour l'azurage des matières fibreuses synthé- tiques. en particulier celles à base de polyesters, de polyamides ou d'esters cellulosique.

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