Polyamide foams, process to make them and applications thereof

Abstract

Closed cell polyamide foams are prepared by subjecting a polyamide resin to inert gases at an elevated pressure and at a temperature above the softening point of the resin and reducing the pressure while the temperature is maintained above the softening point of the resin, resulting in expansion of the resin.

Description

technical field The present invention relates to polyamide foams, their production methods and applications. Background technique High-quality foam materials are manufactured by infiltrating polyamide resins or alloys with an inert gas under high pressure, and then reducing the pressure to expand the material. The material is preferably crosslinked to infiltrate and swell well above the normal melting point. The foam obtained can be fabricated into any desired shape, such as tubes, sheets, strips, blocks and rods, using techniques such as cutting, welding, thermoforming and bonding. Alternatively, the polyamide resin or alloy may be expanded directly into the desired shape, for example, by expanding the infiltrated polyamide resin or alloy in a mold. They are useful in applications requiring low density, high temperature properties. They have the additional benefits of high purity, good chemical resistance and good heat resistance. They also exhibit good sound and therma...

AI Technical Summary

Problems solved by technology

However, foams made from said materials are limited in thermal and chemical resistance

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