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. 23, 1991
Filed:
Aug. 24, 1989
Shoichi Nishizaki, Shiga, JP;
Tominobu Mayuzumi, Kyoto, JP;
Dai-Ichi Kogyo Seiyaku Co., Ltd., Kyoto, JP;
Abstract
The present invention relates to a dispersant for nonaqueous systems which can disperse insoluble fine powders in nonaqueous liquids in a short period of time and give long-term dispersion stability to the resulting dispersions without allowing the formation of a so-called hard cake. The dispersant consists essentially of at least one polyether compound derived from at least one member of the class consisting of polyamine compounds having 5 to 300 active hydrogen atoms per molecule, polyalkylenimine compounds having 5 to 300 active hydrogen atoms per molecule, and derivatives thereof having 5 to 300 active hydrogen atoms per molecule by addition of at least one of ethylene oxide and propylene oxide and at least one alpha-olefin oxide containing 4 to 30 carbon atoms. The polyether compound has a molecular weight of 1,000 to 1,000,000. The dispersant has a favorable constitution resulting from well-balanced and efficient addition of hydrophobic and hydrophilic alkylene oxides and can disperse different fine powders in various nonaqueous liquids in a short period of time. The dispersions obtained show good storage stability for a prolonged period of time. The invention thus greatly contributes to the technical advancement in the field of nonaqueous fine powder dispersions.