The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 18, 1988
Filed:
May. 26, 1987
Michael J Doyle, Amsterdam, NL;
Johan C van Ravenswaay Claasen, Amsterdam, NL;
Gerrit G Rosenbrand, Amsterdam, NL;
Richard L Wife, Amsterdam, NL;
Shell Oil Company, Houston, TX (US);
Abstract
Polymers of relatively high bulk density are produced at a satisfactory rate by polymerization carried out as a gas phase polymerization, in which the monomers are contacted with the catalyst composition in the substantial absence of a liquid non-polymerizable diluent. Comparison of polymerization in liquid phase and in gas phase polymerization shows that when for both polymerizations the temperature is lowered to achieve the same increase in molecular weight, the gas phase polymerization shows a considerably smaller loss of reaction rate and bulk density. It has further been found that when polymers of the same molecular weights are prepared in both gas phase and liquid phase polymerizations, the rate at which the polymers are produced is higher in the case of the gas phase polymerizations, and, in addition, the gas phase prepared polymers have higher bulk densities.