Provided is a particle suitable for a specimen test, which has high sensitization efficiency in a reaction with an antibody, shows high detection sensitivity as a latex reagent, hardly agglutinates during its storage, and hardly causes nonspecific adsorption even when not post-coated. The particle is a particle including a copolymer containing a monomer unit derived from a styrene-based monomer and a monomer unit derived from a glycidyl group-containing monomer, the particle being represented by the following general formula (1):

##STR00001##

in the general formula (1), L.sub.1 represents a copolymer moiety containing the monomer unit derived from the styrene-based monomer and the monomer unit derived from the glycidyl group-containing monomer, n represents from 4 to 11, and R.sup.1 and R.sup.2 each represent a hydrogen atom, an alkyl group, or a halogen.

The disclosure provides a method for removing a C4-C20 hydrophilic compound. The method for removing a hydrophilic compound includes step (a) of exposing a composition containing a C4-C20 hydrophilic compound to 0.1 to 500 kGy of radiation to remove the hydrophilic compound.

The disclosure provides a method for removing a C4-C20 hydrophilic compound. The method for removing a hydrophilic compound includes step (a) of exposing a composition containing a C4-C20 hydrophilic compound to 0.1 to 500 kGy of radiation to remove the hydrophilic compound.

A synthetic polyisoprene copolymer is manufactured by stirring a synthetic polyisoprene rubber latex under the heating condition of 50 C. or higher, purifying the latex by centrifugation, adding a vinyl monomer to the purified synthetic polyisoprene rubber latex obtained and graft-copolymerizing the vinyl monomer. The synthetic polyisoprene copolymer is a copolymer in which a vinyl monomer is graft-copolymerized on the surface of synthetic polyisoprene particles, and which has a nanomatirx structure in which the synthetic polyisoprene rubber particles are dispersed in a continuous phase having a thickness of from 1 to 100 nm formed by graft chains in a phase-separated state.

A synthetic polyisoprene copolymer is manufactured by stirring a synthetic polyisoprene rubber latex under the heating condition of 50 C. or higher, purifying the latex by centrifugation, adding a vinyl monomer to the purified synthetic polyisoprene rubber latex obtained and graft-copolymerizing the vinyl monomer. The synthetic polyisoprene copolymer is a copolymer in which a vinyl monomer is graft-copolymerized on the surface of synthetic polyisoprene particles, and which has a nanomatirx structure in which the synthetic polyisoprene rubber particles are dispersed in a continuous phase having a thickness of from 1 to 100 nm formed by graft chains in a phase-separated state.

A method for producing an aqueous dispersion of purified polytetrafluoroethylene, the method including: removing or reducing a compound represented by Formula (1) or (2) below from an aqueous dispersion of polytetrafluoroethylene obtained using a hydrocarbon surfactant:
(H(CF.sub.2).sub.mCOO).sub.pM.sup.1; orFormula (1):
(H(CF.sub.2).sub.nSO.sub.3).sub.qM.sup.2.Formula (2): Also disclosed is a composition containing polytetrafluoroethylene substantially free from a compound represented by Formula (3) below and a molded body including the composition:
(H(CF.sub.2).sub.8SO.sub.3).sub.qM.sup.2.Formula (3):

A method for producing an aqueous dispersion of purified polytetrafluoroethylene, the method including: removing or reducing a compound represented by Formula (1) or (2) below from an aqueous dispersion of polytetrafluoroethylene obtained using a hydrocarbon surfactant:
(H(CF.sub.2).sub.mCOO).sub.pM.sup.1; orFormula (1):
(H(CF.sub.2).sub.nSO.sub.3).sub.qM.sup.2.Formula (2): Also disclosed is a composition containing polytetrafluoroethylene substantially free from a compound represented by Formula (3) below and a molded body including the composition:
(H(CF.sub.2).sub.8SO.sub.3).sub.qM.sup.2.Formula (3):

A process for producing water-absorbing polymer particles by suspension polymerization and thermal surface postcrosslinking, wherein the agglomerated base polymer obtained by suspension polymerization has a centrifuge retention capacity of at least 37 g/g and the thermal surface postcrosslinking is conducted at 140 to 220 C.

A process for producing water-absorbing polymer particles by suspension polymerization and thermal surface postcrosslinking, wherein the agglomerated base polymer obtained by suspension polymerization has a centrifuge retention capacity of at least 37 g/g and the thermal surface postcrosslinking is conducted at 140 to 220 C.

Provided are methods for removing a perfluorinated alkanoic acid from solutions containing the perfluorinated alkanoic acid and a fluorinated alkoxy acid. These methods include contacting the first solution with an anion-exchange resin to produce a second solution and a resultant anion-exchange resin having perfluorinated alkanoic acid adsorbed thereto, wherein the perfluorinated alkanoic acid is present in the first solution at a first concentration and is present in the second solution at a second concentration which is lower than the first concentration, and separating the second solution from the resultant anion-exchange resin.