Nucleation of polyamides in the presence of hypophosphite

Details Nucleation of polyamides in the presence of hypophosphite Nucleation of polyamides in the presence of hypophosphite

C - Chemistry, Metallurgy

08

K

C08K 3/32 (2006.01) C08K 5/00 (2006.01) C08K 5/51 (2006.01) C08K 5/5313 (2006.01) C08L 77/00 (2006.01) C08L 77/06 (2006.01)

Patent

CA 2333404

The present invention provides polyamide compositions comprising a polyamide, nylon 2,2, and a phosphorous-containing whitening agent having Formula (I), wherein R is hydrogen, an alkyl group with 1 to 6 carbons, a cycloalkyl group with 5 to 6 carbons, or a phenyl or methylphenyl aromatic group, and M is hydrogen or a metal. In a preferred embodiment, the polyamide is nylon 6,6 (polyhexamethylene adipamide) and the phosphorous-containing whitening agent is a hypophosphorous acid or a metal hypophosphite. Sodium hypophosphite is especially preferred. The polyamide compositions of the present invention have improved molding cycle times, and are tough, white and color-stable.

La présente invention concerne des compositions de polyamides comprenant un polyamide, en l'occurrence le Nylon 2,2, et un azurant optique phosphoré représenté par la formule générale (I). En l'occurrence, R est hydrogène, groupe alkyle en C¿1?-C¿6?, groupe cycloalkyle en C¿5?-C¿6?, ou groupe aromatique phényle ou méthylphényle. M est hydrogène ou métal. Selon une réalisation préférée, le polyamide est le Nylon 6,6 (polyhexaméthylène adipamide), l'azurant optique étant un acide hypophosphoreux ou un hypophosphite de métal, avec une préférence particulière pour l'hypophosphite de sodium. Les compositions de polyamides de la présente invention se caractérisent par une amélioration du temps de cycle de moulage, par leur ténacité, par leur blancheur et par la stabilité des couleurs.

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