Patent ID: 6750284
Filing Date: 2004-06-15
Classification: B32B,C08F,C08J,C08L,Y10T

Abstract:
A thermoplastic membrane formed from a blend of:a) from 30 to 97 percent by weight of a semicrystalline first polymer component (FPC), wherein said FPC comprises a propylene-ethylene copolymer containing from 80 to 93 percent by weight of units derived from propylene, and having a melting point derived from stereoregular polypropylene sequences, as determined by differential scanning calorimetry (DSC), in the range of from 25Â° C. to 70Â° C., and a heat of fusion of from 2 J/g to 25 J/g; b) from 1 to 40 percent by weight of an inorganic filler; c) from 1 to 25 percent by weight of a processing oil; and d) from 1 to 40 percent by weight of a crystalline second polymer component (SPC), wherein said SPC is a stereoregular polypropylene containing less than 7 percent by weight of units derived from ethylene or alpha-olefin monomer containing from 4 to 8 carbon atoms and having melting point, as determined by DSC, greater than 130Â° C., and a heat of fusion greater than 80 J/g; wherein the sum of components in said blend is 100 percent.