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:
Sep. 27, 2005
Filed:
Sep. 11, 2000
Kari-anne Leth-olsen, Skien, NO;
Øystein Paulsen, Brevik, NO;
Steinar Pedersen, Skien, NO;
Bård Sæthre, Porsgrunn, NO;
Rolf Olaf Larsen, Langesund, NO;
Kari-Anne Leth-Olsen, Skien, NO;
Øystein Paulsen, Brevik, NO;
Steinar Pedersen, Skien, NO;
Bård Sæthre, Porsgrunn, NO;
Rolf Olaf Larsen, Langesund, NO;
Norsk Hydro ASA, Oslo, NO;
Abstract
The present invention concerns large spherical polymer particles with a narrow size distribution and a procedure for producing such particles. The procedure is characterized in that a seed polymerization is performed in which the start particles have a very high ability to absorb new monomer so that finished particles are obtained after only one stage of polymerization even if the finished particles are to be as large as in the range 10 to 100 μm. The procedure is also characterized in that, when porous particles are produced, a porous structure can be formed in which the fraction of micropores is insignificant. Another characteristic feature of the procedure is that the size distribution of the finished particles is narrow and in some cases narrower than in the start particles.