Expandable polyamide composition and polyamide foam obtained therefrom

摘要

The present invention relates to an expandable polyamide composition and to a polyamide foam obtained therefrom. This composition comprises a compound comprising at least one isocyanate function, a polyamide and a compound comprising at least one carboxylic acid function. The invention also relates to a process for preparing a polyamide foam from this composition.

主权项

1. An expandable polyimide composition comprising:
compound A: a compound having at least one isocyanate function protected with a protecting group; and compound B: a polyamide; wherein the polyamide comprises a carboxylic acid function at least at two ends of a polyamide chain, and wherein the number of moles of acid functions of said polyamide is greater than the number of moles of the amine functions; wherein when said composition is heated to a temperature of at least 80° C., compounds A and B of said composition react to form a foam, and said composition does not contain additional compounds that react to release a gas to produce the foam, wherein an amount of compound A and an amount of compound B, are selected to control the amount of gas released when the foam is produced, and wherein compound B is present in the composition in an amount greater than the amount of the compound having at least one isocyanate function.