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:
Jul. 19, 1994
Filed:
Jan. 29, 1993
Russell E Hynes, Aberdeen, MS (US);
Robert S Nebergall, Lombard, IL (US);
American Colloid Company, Arlington Heights, IL (US);
Abstract
A bentonite clay-based polymerization catalyst is manufactured by adhering together a plurality of smaller acid-activated bentonite clay particles, using a strong mineral acid, such as H.sub.2 SO.sub.4, as a binder. An acid-activated bentonite clay having a particle size below about 60 mesh, U.S. Sieve Series, preferably calcium bentonite, having calcium as a predominant exchangeable action, is mixed with a strong mineral acid, preferably H.sub.2 SO.sub.4, and water to form the catalyst. The mixture is subjected to intensive mixing, curing and drying to form strong particles capable of grinding to a desired particle size distribution, e.g., -6 mesh to +60 mesh, U.S. Sieve Series, to form the catalyst. Fines resulting from the grinding step are completely recycled to the intensive mixing stage of the process to achieve 100% yield. Some adjustment of acid content of the mix may be needed to take into account the acid carried into the mix by recycled fines.