Patent ID: 6521729
Filing Date: 2003-02-18
Classification: G01N,Y10T

Abstract:
Monodisperse fluorine-containing spherical bead polymer particles having an average particle diameter of about 5 &mgr;m to about 5.5 &mgr;m +/âˆ’0.1 and a refractive index of about 1.4+/âˆ’0.005 for standardizing and calibrating hematology analyzers for red blood cell analysis, said particles selected from the group consisting of 2-fluorethylacrylate, 2,2,2-trifluoroethylacrylate, 2,2,3,3-tetrafluoropropylacrylate, 2,2,3,4,4,4-hexafluorobutylacrylate, 1H,1H-heptafluorobutylacrylate, 1H,1H, 5H-octafluoropentylacrylate, 1H,1H-pentadecafluoroctylacrylate, 2-fluoroethylmethacrylate, 2,2,2-trifluoroethylmethacrylate, 2,2,3,3,3-pentafluoropropylmethacrylate, 1H, 1H-hepatafluorobutylmethacrylate, 2,2,3,4,4,4-hexafluorobutylmethacrylate, 1H,1H,5H-octafluoropentylmethacrylate, 1H,1H,11H-eicosafluoroundecylmethacrylate and mixtures thereof.