Nylon molding compositions having improved surface appearance

C - Chemistry – Metallurgy – 08 – L

Patent

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Details

C08L 77/02 (2006.01) C08G 69/36 (2006.01) C08L 77/00 (2006.01) C08L 77/06 (2006.01)

Patent

CA 2386994

The invention relates to nylon compositions having improved surface aesthetics while maintaining its physical properties and to a method for preparing molded articles of from such nylon compositions. The nylon composition is composed of a substantially uniform blend of nylon 6,6,6 copolymer of from about 65 to about 75 parts by weight of caprolactam and from about 25 to about 35 parts by weight of hexamethylenediamine and adipic acid in a 1:1 ratio; together with a second polyamide which is nylon 6 homopolymer. The first polyamide is present in the overall composition in an amount of from about 7 to about 20 weight percent and said second polyamide is present in the overall composition in an amount of from about 80 to about 83 weight percent. The nylon compositions are useful to create injection molded articles having a good surface appearance and good performance at a low cost.

L'invention concerne des compositions de nylon qui présentent une esthétique superficielle améliorée et gardent à la fois leurs propriétés physiques et un procédé de préparation d'articles moulus constitués à partir de telles compositions de nylon. La composition de nylon est composée d'un mélange pratiquement uniforme de copolymère 6,6,6, de nylon renfermant environ 65 à 75 parties en poids de caprolactame et environ 25 à 35 parties en poids d'hexaméthylènediamine et d'acide adipique dans un rapport 1:1, ainsi que d'un second polyamide qui est un homopolymère 6 de nylon. Le premier polyamide est présent dans l'ensemble de la composition en une quantité d'environ 7 à 20 pour-cent en poids et le second polyamide est présent dans toute la composition en une quantité d'environ 80 à 83 pour-cent en poids. Les compositions de nylon sont utiles pour créer des articles moulus par injection qui présentent une bonne apparence superficielle et un bon rendement pour un faible coût.

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