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. 07, 1987
Filed:
Dec. 12, 1985
Marek Torbus, Dusseldorf, DE;
Abstract
This invention relates to a mould material binding agent system for the manufacture of foundry mould parts. This binding agent system contains, as components, a solution of a phenol-containing polyol having at least two OH-groups in the molecule and a polyisocyanate, optionally in the form of a solution, having at least two NCO-groups in the molecule, which react with each other to a cold-hardening binding agent with formation of polyurethane. As polyisocyanate component there are used (optionally phenyl-substituted) diphenyl-4,4', diisocyanates having a content of more than 10% by wt. (referred to the total quantity of polyisocyanate), preferably more than 20% by wt., of the isomeric diphenyl-2,4'-diisocyanate (likewise optionally phenyl-substituted), which also contain an addition of a small quantity of acid chlorides and/or chlorosilanes. With the invention, a simply and economically manufactured binding agent is created, which combines high initial strengths of the mould parts with good sand lives of the mould material mixture.