Patent ID: 6649666
Filing Date: 2003-11-18
Classification: C08J,C08K

Abstract:
A process for preparing a foam comprising the steps of:(i) introducing into a melt processing device: (a) a propylene polymer and (b) a coupling amount of a poly(sulfonyl azide), forming a propylene polymer admixture, (ii) exposing the propylene polymer admixture to a temperature sufficient to result in coupling of the propylene polymer forming a molten coupled propylene polymer composition, (iii) introducing a blowing agent before, during or after the coupling of the propylene polymer under a first pressure which maintains the blowing agent in the molten coupled propylene polymer composition, (iv) cooling the molten coupled propylene polymer composition comprising the blowing agent, (v) processing the molten coupled propylene polymer composition comprising the blowing agent into a zone having a second pressure which allows for the blowing agent to escape from the molten coupled propylene polymer composition and (vi) forming a resulting foam.