Patent ID: 8071699

Claim:
A method of controlling a process for producing a polymer in at least one reactor, comprising: (a) calculating a first value of at least one property of a first polymer component using a mathematical model for the first polymer component produced by a first catalyst or under a first set of reaction conditions; (b) calculating a second value of the at least one property of a second polymer component using a mathematical model for the second polymer component produced by a second catalyst or under a first set of reaction conditions; (c) determining the relative rate of production of the first and second polymer components; (d) calculating a bulk average value of the at least one property using a mathematical model for the bulk averaged composition; (e) adjusting one or more reaction conditions thereby effecting an instantaneous value of the at least one property of at least one of the first or second polymer components or effecting the production rate of at least one of the first or second polymer components to move the bulk average value toward a desired set point value.