Disclosed herein is a preparation method of homopolymer nanoparticles without using a surfactant. The homopolymer nanoparticles prepared thereby are expected to be widely used not only as a template of a semiconductor metal oxide, a drug delivery system (DDS), an electron transport layer (ETL), and a seed having vertical structural shape, but also in a high precision field such as replacement of an organic device polystyrene bead film.

A surface physical property modifier composition includes (A) a wax, (B) a vinyl (co)polymer, and (C) an aliphatic hydrocarbon having a carbon number of 5 to 14. Component (A) is set to be at least one selected from the group consisting of (a1) paraffin wax, (a2) microcrystalline wax, (a3) Fischer-Tropsch wax, and (a4) polyethylene wax, and component (B) is produced from at least one of (b1) a (meth)acrylonitrile, (b2) a (meth)acrylic acid having a carbon number of 1 to 4, (b3) a hydroxyethyl (meth)acrylate or hydroxypropyl (meth)acrylate, (b4) styrene, and (b5) predetermined (meth)acrylic acid alkyl esters. Component (A) is 50 to 98 parts by mass relative to 100 parts by mass of the total of (A) and (B), and component (C) is 0.001 to 1 percent by mass relative to the total amount of (A).

A lens wearable in an eye of a user can indicate intraocular pressure of the eye. The wearable lens includes a substrate containing anthocyanins. The substrate is formed by polymerization of a hydrophilic monomer and a hydrated polymer under the effects of a photoinitiator and a cross-linking agent. The anthocyanins in the substrate change color according to the pH of the eye, and the pH of the eye is determined according to the intraocular pressure of the eye.

A resin composition is based on a resin chosen from the group consisting of unsaturated polyester resins and vinyl ester resins, a crosslinking initiator and a crosslinking agent of general formula R.sub.1XR.sub.2, in which X is an optionally substituted alkylene group and R.sub.1 and R.sub.2 are, independently of one another, an acrylate, methacrylate or vinyl group, an alkenyl group bearing an unsaturated carbon at the chain end, or an alkynyl group bearing an unsaturated carbon at the chain end.

A resin composition is based on a resin chosen from the group consisting of unsaturated polyester resins and vinyl ester resins, a crosslinking initiator and a crosslinking agent of general formula R.sub.1XR.sub.2, in which X is an optionally substituted alkylene group and R.sub.1 and R.sub.2 are, independently of one another, an acrylate, methacrylate or vinyl group, an alkenyl group bearing an unsaturated carbon at the chain end, or an alkynyl group bearing an unsaturated carbon at the chain end.

A cured product of a resin composition. The resin composition comprises a compound represented by the following formula (1): ##STR00001##
R.sub.1 to R.sub.4 are each independently selected from a polymerizable functional group, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkyl group having a polymerizable functional group at a terminal thereof which may contain an oxygen or sulfur atom replacing one CH.sub.2 in a main chain of the alkyl group. R.sub.5 to R.sub.9 are each independently selected from a hydrogen atom and a trifluoromethyl group. However, at least one of R.sub.1 to R.sub.4 is a polymerizable functional group or a substituent having a polymerizable functional group, and at least one of R.sub.5 to R.sub.9 is a trifluoromethyl group.