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:
Jun. 20, 1989
Filed:
Dec. 16, 1987
Montedison S.p.A., Milan, IT;
Abstract
Modified polyisocyanates with biuret structure containing terminal urethane groups and having general formula: ##STR1## in which R.sub.1 is an aliphatic, cycloaliphatic or aliphatic-cycloaliphatic radical, simple or substituted, and R.sub.2 can have the same meanings as R.sub.1 or can be the radical R.sub.3 (OC.sub.n H.sub.2n).sub.x --. Process for the preparation of modified polyisocyanates having biuret structure containing terminal urethane groups having general formula (I) consisting in reacting an organic diisocyanate with water or with a compound which splits off water, in the presence of a compatibilizing agent having a hydrogen atom reactive towards the isocyanate group, as it can be determined by Zerewitinoff's method.