Process for producing a modified polypropylene and a molded product

摘要

A process for producing a modified polypropylene having a very high melt tension and superior stiffness and moldability, and a molded product obtained by using the modified polypropylene are provided. which process includes adding 0.05 to 10 millimols of a cross-linking auxiliary to 100 g of a linear polypropylene, mixing them, irradiating ionizing radiations to the mixture so as to give an absorbed dosage of 1 to 20 kGy, and successively heat-treating the resulting material at 80 DEG to 350 DEG C., which modified polypropylene has (A) a degree of branching of substantially 1, (B) a relationship between its melt tension (MS) at 230 DEG C. and its intrinsic viscosity ( eta ) measured in tetralin at 230 DEG C. expressed by an inequalitylog (MS)>4.24xlog [ eta ]-0.915, and(C) a percentage of extraction residue in boiling xylene of 1% by weight or less.