Polyguanidine foams
AssigneeBayer Aktiengesellschaft
InventorsRolf Wiedermann, Andrea La Spina
Life of this patent
Estimating the term…
Abstract
A polyguanidine foam is prepared by reacting an amine or ammonia with a polycarbodiimide foam which has been prepared from a reaction mixture containing an addition product of an alcohol and a phospholine oxide or sulphide. The novel foam may be used for heat insulation or as an absorbent material.
Claims5
A process for producing a polyguanidine foam which comprises reacting a solid polycarbodiimide foam with a fluid containing a primary or secondary amine or ammonia.
A method of making polyguanidine foam which comprises contacting a carbodiimide foam with a fluid containing hydrazine, ammonia or a primary or secondary amine, said polycarbodiimide foam having been prepared from a reaction mixture containing an organic polyisocyanate, addition product of phospholine oxide or sulfide and an alcohol or a protonic acid which in a N/10 aqueous solution has a pH of 1 to 8, a metal salt or an acid chloride and optionally a blowing agent.
Dependencies are inferred from the claim text.