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:
Sep. 01, 1981
Filed:
Jan. 31, 1980
Patrick H Stewart, Danville, IL (US);
Wayne D Woodson, Danville, IL (US);
CL Industries, Inc., Danville, IL (US);
Abstract
A method of producing sand cores or molds for foundry use involves coating the sand with a novel acid catalyst composition and adding acid-curing, condensation-type resin. A novel acid catalyst composition comprises the mixture of a sulfonic acid such as benzene sulfonic acid, toluene sulfonic acid or xylene sulfonic acid, or mixtures thereof, with 0.5-20% wt. perchloric acid. A catalyst of this composition, when admixed with foundry sand and an acid-curing condensation-type resin, is a novel composition characterized by rapid cure and high tensile strength and hardness in the resulting resin-bound sand core or mold. Sand cores or molds made using this catalyst/sand/resin composition are further characterized by low emissions of oxidizable gaseous organic constituents.