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:
Feb. 07, 1978
Filed:
Aug. 07, 1975
Applicant:
Inventor:
Rolf Kubens, Odenthal-Hahnenberg, DT;
Assignee:
Bayer Aktiengesellschaft, Leverkusen, DT;
Primary Examiner:
Int. Cl.
CPC ...
C08K / ; B22C / ; B29C / ;
U.S. Cl.
CPC ...
260 / ; 260 38 ; 260D / ; 164 43 ; 264239 ; 264240 ; 264219 ;
Abstract
Foundry cores and molds are produced from foundry sand and/or other inert fillers, polyhydroxyl compounds, polyisocyanates and tertiary amine catalysts. The precatalyzed mixtures can be stored for long periods of time without any adverse effects on the subsequent processing or core properties when at least 80% by weight of the polyisocyanate used is of the diphenyl alkane series in which the isocyanate groups are sterically hindered solely by substituents in at least one ortho position.