Patent ID: 8921466

Claim:
A method of production of long chain branched polypropylene with high melt strength, comprising: a) admixing a base polypropylene polymer, a stabilizer and a coagent at a temperature in the range between 25° C. to 180° C. for 5 minutes to 120 minutes for initiation of grafting reaction in solid; b) incubating the reaction mixture at room temperature for 2 hours to 30 hours for continuation of the grafting reaction and for uniform dispersion of coagent on the said base polypropylene polymer; and c) extruding the reaction mixture at 10° to 80° C. above the melt temperature of the said base polypropylene polymer to allow completion of the grafting reaction during extrusion to obtain long chain branched polypropylene with high melt strength, wherein the stabilizer is Tris-(2,4-di-tert-butylphenyl)phopshite used at a concentration in the range between 200 ppm and 3000 ppm.