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:
Mar. 30, 1999
Filed:
May. 13, 1996
Michio Satsuma, Osaka, JP;
Yutaka Tosaki, Osaka, JP;
Nitto Denko Corporation, Osaka, JP;
Abstract
A process for producing an aqueous dispersion-type acrylic polymer is disclosed, which comprises introducing a monomer comprising an alkyl (meth)acrylate as the main component into a polymerization vessel at a time at a monomer concentration of 40% by weight or higher, adding a water-soluble radical polymerization initiator thereto in an amount of from 0.001 to 0.05 parts by weight per 100 parts by weight of the monomer, and emulsion-polymerizing the monomer substantially at 20.degree. to 60.degree. C. The aqueous dispersion-type acrylic polymer thus obtained satisfies the equation log M>3log S-2, wherein S is a tetrahydrofuran (THF)-soluble content (wt %) of the polymer and M is a weight-average molecular weight (.times.10,000) of a soluble part of the polymer. This polymer is preferably used for a pressure-sensitive adhesive in pressure-sensitive adhesive-covered products.