초록 ▼

There is provided thermally stabilized polypropylene melt-blown microfiber acoustical insulation web which has a resistance to thermal degradation at a temperature of 135.degree. C. for at least 10 days. The polypropylene has a thermal stabilizer uniformly distributed within the melt-blown microfibe

There is provided thermally stabilized polypropylene melt-blown microfiber acoustical insulation web which has a resistance to thermal degradation at a temperature of 135.degree. C. for at least 10 days. The polypropylene has a thermal stabilizer uniformly distributed within the melt-blown microfiber polymer which polymer when produced is subject to thermal and/or catalytic degradation in the absence of significant levels of thermal stabilizer or antioxidant.

대표청구항 ▼

[ We claim:] [1.] A thermally stable acoustical insulation microfiber web for attenuation of sound waves comprising a melt-blown polypropylene microfiber web having an average effective fiber diameter of less than about 15 microns, a thickness of at least about 0.5 cm, a density of less than 50 kg/m

[ We claim:] [1.] A thermally stable acoustical insulation microfiber web for attenuation of sound waves comprising a melt-blown polypropylene microfiber web having an average effective fiber diameter of less than about 15 microns, a thickness of at least about 0.5 cm, a density of less than 50 kg/m.sup.3 and a pressure drop of at least about 1 mm water at a flow rate of about 32 liters/min., said polypropylene microfibers formed of polypropylene homopolymers, copolymers or blends thereof with a nonvolatile thermal stabilizer or antioxidant is uniformly distributed throughout the microfibers such that the microfibers are thermally stable for at least 10 days at 135.degree. C.