| abstract |
A process for producing a modified polypropylene havingn (A) a degree of branching of substantially 1, (B) a relationship between its melt tension (MS) at 230°C and its intrinsic viscosity (η) measured in tetralin at 135°C expressed by an inequality log (MS) > 4.24 x log [η] - 0.915, and (C) a percentage of extraction residue in boiling xylene of 1% by weight or less, n which process comprises: n adding 0.05 to 10 millimols of a cross-linking auxiliary to 100 g of a linear polypropylene; n mixing the cross-linking auxiliary and the linear polyethylene, n irradiating the mixture with ionizing radiation so as to give an absorbed dosage of 1 to 20 kGy; and n subsequently heat-treating the resulting material at 80° to 350°C. |