Patent ID: 7737230

Claim:
A method of determining the composition of a multimodal polyolefin mixture comprising at least two defined polymer components having relaxation curves and differing number average molar masses M n , comprising: (a) polymerizing olefins in at least one polymerization reactor, thereby forming a multimodal polyolefin mixture comprising at least two polymer components; (b) recording at least one 1 H-NMR relaxation curve of the polyolefin mixture; (c) preparing samples of the pure polymer components of the polymer mixture before or after the measurement of the relaxation curves of the polymer mixture; (d) recording at least one 1 H-NMR relaxation curve for each of the polymer components of the polyolefin mixture; and (e) calculating proportions of the polymer components by matching the relaxation curve of the polyolefin mixture measured in step (b) with the relaxation curves of the individual polymer components measured in step (d).