Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Reexamination Certificate
2005-09-27
2005-09-27
Zalukaeva, Tatyana (Department: 1713)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
C524S469000, C526S201000, C526S203000, C526S909000
Reexamination Certificate
active
06949601
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.
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Larsen Rolf Olaf
Leth-Olsen Kari-Anne
Paulsen Øystein
Pedersen Steinar
Sæthre Bård
Norsk Hydro ASA
Wenderoth , Lind & Ponack, L.L.P.
Zalukaeva Tatyana
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