Impact protection device for the occupants of motor vehicles with a filter to clean the driving gas

Claim 1

An impact protection device for an occupant of a motor vehicle, having a cushion which can be blown up in the event of a collision by means of a driving gas generated by combustion of solid gas-generating materials, a part of a wall of said cushion having a multiplicity of openings which are outlet flow openings from said cushion for said driving gas, and having a filter for cleaning solid combustion residues from said driving gas, wherein: said outlet openings simultaneously form said filter and said filter comprises a fabric that does not stretch upon being blown up by the driving gas and which has a filter weave with a tearing force to DIN 53 354 of at least 1500N/5 cm, a further tearing force to DIN 53 536 with test body B of at least 150N, a heat resistance of at least 1 second at 300° C. without substantial reduction in strength, an unstressed pore size by means of which at least 50% of particles with a size of more than 0.1 μm are retained and an air permeability L in L.cm -2 .min -1 , which lies in the region enclosed by curves L=0.05+0.075.p and L=1.2+0.6.p, and which has an area of 500 to 10,000 cm 2 .