Abstract: An aqueous colloidal dispersion for diagnostic or immunodiagnostic tests, comprising non-polymer nuclei surrounded by a hydrophilic copolymer that contains functional groups, a method for the detection of a specifically binding substance or immunochemically active component in a test fluid, and test kit containing the aqueous colloidal dispersion.

Abstract: The invention relates to an aqueous suspension for diagnostic or immunodiagnostic tests, comprising non-polymer nuclei surrounded by a hydrophilic copolymer that contains functional groups, and also to a method for the preparation of this suspension. The method involves adding a monomer mixture to a colloidal dispersion of non-polymer particles, the monomer mixture being so chosen that the resultant copolymer has a charge of identical sign to that of the original dispersion. The invention also relates to a method for the detection of a specifically binding substance or immunochemically active component in a test fluid, and to a reagent and a test kit to be used when employing said detection methods.

Abstract: A process for preparing a copolymer suitable for use in an optical element which comprises the step of radically-polymerizing a composition which comprises at least one first monomer represented by formula (I), at least one second monomer represented by any one of formulas (II, III, and IV), and 0,005 to 1.0 weight percent of said polymerizable composition of an organic chain transfer agent having a chain transfer coefficient at 50.degree.-60.degree. C. of greater than 0.6 with acrylic monomer or styrenic monomer; in the presence of a radical polymerization initiator, is disclosed. Also disclosed is a copolymer suitable for use as an optical element obtained by the foregoing process and an optical element comprising this copolymer. The process of the disclosure provides essentially striation-free polymers which can be used to fabricate optical elements including thick lenses for glasses.