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:
May. 22, 2007
Filed:
Aug. 03, 2004
Toshiyasu Nishioka, Konohana-ku, JP;
Akira Kamimura, Konohana-ku, JP;
Makoto Itagaki, Niihama, JP;
Nippon A&L Incorporated, Osaka, JP;
Abstract
A copolymer latex for chipping-resistant aqueous paint capable of remarkably improving balance of chipping-resistance, strength of adherence with metal, water-resistance and high resistance for cycles of cool and heat is provided. This is achieved by a method for producing a copolymer latex using for chipping-resistant aqueous paint, the method comprising emulsion-polymerizing 20 to 80 parts by weight of a conjugated diene as a monomer, 0.5 to 15 parts by weight of an ethylenically unsaturated carboxylic acid as a monomer, 5 to 40 parts by weight of an aromatic vinyl compound as a monomer, 5 to 40 parts by weight of an unsaturated alkyl carboxylate as a monomer and optionally not more than 69.5 parts by weight of other compound having vinyl group copolymerizable therewith as a monomer based on 100 parts by weight in the total of the monomers, wherein 100 wt % of the amount of conjugated diene, 100 wt % of the amount of ethylenically unsaturated carboxylic acid, 95 to 50 wt % of the amount of aromatic vinyl compound and 95 to 50 wt % of the amount of the unsaturated alkyl carboxylate are added in the former stage of the emulsion-polymerization, and 5 to 50 wt % of the amount of the aromatic vinyl compound and 5 to 50 wt % of the amount of the unsaturated alkyl carboxylate are added at the later stage of emulsion-polymerization.