Stable polynitrile oxides and their use as curing agent...

C - Chemistry – Metallurgy – 07 – C

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C07C 291/06 (2006.01) C07C 317/44 (2006.01) C07C 323/63 (2006.01) C07D 261/04 (2006.01) C08F 8/30 (2006.01) C08K 5/32 (2006.01)

Patent

CA 2226849

The present invention is an aqueous dispersion of a stable polynitrile oxide represented by the structure: R-(CN-O-)x, whre x is an integer greater than 1, R is an aromatic, aliphatic, or cycloaliphatic group having at least one substituent adjacent to each nitrile oxide group, the substituent characterized by inhibiting dimerization of nitrile oxide, and being non- interfering with a reaction between nitrile oxide groups and unsaturated groups. The present invention is also a method of curing a latex having a polyunsaturated disperse phase, comprising the steps of: a) mixing the latex with a stable polynitrile oxide; and b) removing water form the mixture. The present invention provides a simple means of preparing one-part coating systems that can be cured at room temperature without the release of by- products.

La présente invention concerne une dispersion aqueuse d'un oxyde de polynitrile stable représenté par la structure: (I) où x désigne un nombre entier plus grand que 1, R un groupe aromatique, aliphatique ou cycloaliphatique comportant au moins un substituant adjacent à chaque groupe oxyde de nitrile, ledit substituant étant caractérisé par la dimérisation inhibitrice de l'oxyde de nitrile et n'interférant pas avec une réaction entre les groupes oxydes de nitrile et les groupes insaturés. La présente invention concerne aussi une technique de traitement d'un latex comportant une phase en dispersion polyinsaturée, avec les étapes suivantes: a) mélange du latex avec un oxyde de polynitrile stable, b) élimination de l'eau du mélange. L'invention offre un moyen facile de préparer des systèmes de revêtement simple pouvant être traités à température ambiante sans dégagement de produits secondaires.

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