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:
Dec. 17, 2002
Filed:
Oct. 03, 2000
Toshiki Origuchi, Osaka, JP;
Shintaro Ogawa, Osaka, JP;
Konishi Co. Ltd., Osaka, JP;
Abstract
A process of the invention produces a vinyl acetate polymer based emulsion by seed polymerization of vinyl acetate in an ethylene-vinyl acetate copolymer based emulsion. This process includes a step of performing seed polymerization while adding vinyl acetate to a system, and, prior to or subsequent to the step, a step of adding a polymerizable unsaturated monomer other than vinyl acetate to the system. The amount of the polymerizable unsaturated monomer other than vinyl acetate is, for example, about 0.05 to 10 parts by weight relative to 100 parts by weight of vinyl acetate. At least one monomer selected from acrylic esters, methacrylic esters, vinyl esters, and vinyl ethers can be used as the polymerizable unsaturated monomer other than vinyl acetate. The invented process can produce a vinyl acetate polymer based emulsion which has satisfactory low-temperature film-forming property and adhesive strength, even containing no plasticizer, and which can exhibit a high adhesive strength even when cured at low temperatures.