Patent ID: 7479513

Claim:
A method of providing polymer matrices for producing intumescing fire-protective seals for through holes, wall bushings and other openings in wall, floors and/or ceilings of buildings, which comprises introducing a fire protection additive into a polymer matrix, wherein said additive is at least one thermally expandable graphite intercalation compound consisting of graphite and of the following intercalate compounds A), B) and C); A) at least one hydrate of at least one of the metal halides selected from the group consisting of FeCl 3 , AlCl 3 , SbCl 5 , YCl 3 , CrCl 3 and NiCl 2 , B) at least one nitroalkane of the general formula CH 3 (CH 2 ) n NO 2 , in which n is a whole number from 0 to 10, as well as its structural isomers or mixtures thereof, and C) at least one acid selected from the group consisting of sulfuric acid, acetic acid and nitric acid.