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. 18, 1995
Filed:
Jan. 10, 1994
Alexander C Tsuei, Woodbury, MN (US);
Smarajit Mitra, West St. Paul, MN (US);
Minnesota Mining and Manufacturing, St. Paul, MN (US);
Abstract
A method for microencapsulating quaternary ammonium salts by interfacial polymerization. The polar component comprises a quaternary ammonium salt, glycerine, triethyleneglycol diamine, a C 4-10 straight or branched aliphatic compound having two primary amine functionalities, and a C 4-10 straight or branched aliphatic compound having at least three primary amine functionalities. The glycerine-immiscible oil component comprises mineral oil, an aliphatic polyisocyanate and a surfactant. The mole equivalent ratios of primary amine to isocyanate in this reaction is about 0.01-3:1. Microcapsules made by this method are unique and provide surprising benefits in durability, elasticity and barrier properties in resistance to leaching of the microcapsule fill material.