The present invention relates to a photocurable composition for imprint in a condensable gas atmosphere. The composition at least includes a polymerizable compound component (A) and photopolymerization initiator component (B) and satisfies the Requirement (1): a value E.sub.CG of greater than or equal to 2.30 GPa, where E.sub.CG denotes the reduced modulus (GPa) of a photocured film prepared by exposing the photocurable composition for imprint to light at an exposure dose of 200 mJ/cm' in an atmosphere containing a condensable gas in a concentration of 90% by volume or more.

An organic film forming composition having improved hygroscopic properties (e.g., moisture-adsorbing abilities) and an electronic apparatus including a cured product of the organic film forming composition. The organic film forming composition may include a metal (meth)acrylate represented by Formula 1; and a curable material having at least two curable groups selected from the groups represented by Formulae 2A to 2D:

##STR00001##

The present invention is a polymer having structural units, units of formula I, units of formula II and units of either formula IIIa or formula IIIb:

##STR00001##

The polymer improves the low-temperature properties of fuel oils from petroleum sources and especially from vegetable or animal sources.

The present invention relates to a viscosity index improver containing a copolymer (A) that contains, as essential constituent monomers, a fluorine atom-containing monomer (a) represented by the following formula (1) and a monomer (b) represented by the following formula (2), wherein the copolymer (A) has a solubility parameter of 8.1 to 10.0 (cal/cm.sup.3).sup.1/2, and a mass ratio (b/a) of the monomer (b) to the monomer (a) in the monomers constituting the copolymer (A) is 0.01 to 42: ##STR00001##
wherein R.sup.1 represents a hydrogen atom or a methyl group; R.sup.2 is a C2-C4 alkylene group; p is an integer of 0 or 1; q is an integer from 0 to 20, each R.sup.2 may be the same as or different from each other when q is 2 or greater; and Y is a monovalent group in which one or more or all of hydrogen atoms in a C1-C40 hydrocarbon group are replaced by fluorine atoms, and ##STR00002##
wherein R.sup.3 represents a hydrogen atom or a methyl group; X.sup.1 is a group represented by O or NH; R.sup.4 is a C2-C4 alkylene group; r is an integer of 0 or 1; s is an integer from 0 to 20, and each R.sup.4 may be the same as or different from each other when s is 2 or greater; and R.sup.5 is a C1-C40 hydrocarbon group.

The present invention relates to a viscosity index improver containing a copolymer (A) that contains, as essential constituent monomers, a fluorine atom-containing monomer (a) represented by the following formula (1) and a monomer (b) represented by the following formula (2), wherein the copolymer (A) has a solubility parameter of 8.1 to 10.0 (cal/cm.sup.3).sup.1/2, and a mass ratio (b/a) of the monomer (b) to the monomer (a) in the monomers constituting the copolymer (A) is 0.01 to 42: ##STR00001##
wherein R.sup.1 represents a hydrogen atom or a methyl group; R.sup.2 is a C2-C4 alkylene group; p is an integer of 0 or 1; q is an integer from 0 to 20, each R.sup.2 may be the same as or different from each other when q is 2 or greater; and Y is a monovalent group in which one or more or all of hydrogen atoms in a C1-C40 hydrocarbon group are replaced by fluorine atoms, and ##STR00002##
wherein R.sup.3 represents a hydrogen atom or a methyl group; X.sup.1 is a group represented by O or NH; R.sup.4 is a C2-C4 alkylene group; r is an integer of 0 or 1; s is an integer from 0 to 20, and each R.sup.4 may be the same as or different from each other when s is 2 or greater; and R.sup.5 is a C1-C40 hydrocarbon group.