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US 8,946,314 B2Granted
Expandable polyamide composition and polyamide foam obtained therefrom
AssigneeRhodia Polyamide Intermediates
InventorsJean-marie Bernard, François Briois, Eric Roche
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Abstract
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.
Claims26
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.
4 more elements
A process for preparing a polyamide foam from an expandable polyamide composition, comprising the steps of:
- a) heating an expandable foam 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 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;
- to a temperature of at least 80° C. to obtain an alveolar structure,
- b) stabilizing the alveolar structure obtained in step a), and
- c) recovering the foam obtained in step b).
8 more elements
Dependencies are inferred from the claim text.