A photocurable composition can comprise a polymerizable material and a photoinitiator, wherein the polymerizable material can comprise a first polymerizable monomer having a structure of Formula (1) or Formula (2):

##STR00001##

with X being C.sub.1-C.sub.4-alkyl or oxygen (O); n being 0 or 1 Y.sub.1, Y.sub.2 being

##STR00002##

with R.sub.3 or, with R.sub.3 being H or methyl, wherein Y.sub.1 and Y.sub.2 may be the same or different and an amount of Y.sub.1 and Y.sub.2 per benzene ring being 1, 2, or 3; R.sub.1, R.sub.2 being substituted or unsubstituted alkyl or aryl, and an amount of each of R.sub.1 and R.sub.2 per benzene ring being 0, 1, 2, 3, or 4.

A photocurable composition can comprise a polymerizable material and a photoinitiator, wherein the polymerizable material can comprise a first polymerizable monomer having a structure of Formula (1) or Formula (2):

##STR00001##

with X being C.sub.1-C.sub.4-alkyl or oxygen (O); n being 0 or 1 Y.sub.1, Y.sub.2 being

##STR00002##

with R.sub.3 or, with R.sub.3 being H or methyl, wherein Y.sub.1 and Y.sub.2 may be the same or different and an amount of Y.sub.1 and Y.sub.2 per benzene ring being 1, 2, or 3; R.sub.1, R.sub.2 being substituted or unsubstituted alkyl or aryl, and an amount of each of R.sub.1 and R.sub.2 per benzene ring being 0, 1, 2, 3, or 4.

[Object] To provide a method for producing a vinyl ether polymer containing a hydrocarbon group in a stable and efficient manner, wherein decomposition of the monomer and generation of polyacetal are suppressed.

[Means for solving problem] The method for producing a vinyl ether polymer containing a hydrocarbon group according to the present invention comprises the step of polymerizing vinyl ether represented by the following formula (1):

##STR00001## wherein R.sup.1 represents an aliphatic hydrocarbon group having 1 to 10 carbons or an alicyclic hydrocarbon group having 3 to 10 carbons,
in the presence of water as a polymerization solvent and an organic azo-based compound as a radical polymerization initiator, under pH of 6 or more.

[Object] To provide a method for producing a vinyl ether polymer containing a hydrocarbon group in a stable and efficient manner, wherein decomposition of the monomer and generation of polyacetal are suppressed.

[Means for solving problem] The method for producing a vinyl ether polymer containing a hydrocarbon group according to the present invention comprises the step of polymerizing vinyl ether represented by the following formula (1):

##STR00001## wherein R.sup.1 represents an aliphatic hydrocarbon group having 1 to 10 carbons or an alicyclic hydrocarbon group having 3 to 10 carbons,
in the presence of water as a polymerization solvent and an organic azo-based compound as a radical polymerization initiator, under pH of 6 or more.

[Object] To provide a method for producing a vinyl ether polymer containing a hydrocarbon group in a stable and efficient manner, wherein decomposition of the monomer and generation of polyacetal are suppressed. [Means for solving problem] The method for producing a vinyl ether polymer containing a hydrocarbon group according to the present invention comprises the step of polymerizing vinyl ether represented by the following formula (1): ##STR00001## wherein R.sup.1 represents an aliphatic hydrocarbon group having 1 to 10 carbons or an alicyclic hydrocarbon group having 3 to 10 carbons,
in the presence of water as a polymerization solvent and an organic azo-based compound as a radical polymerization initiator, under pH of 6 or more.

[Object] To provide a method for producing a vinyl ether polymer containing a hydrocarbon group in a stable and efficient manner, wherein decomposition of the monomer and generation of polyacetal are suppressed. [Means for solving problem] The method for producing a vinyl ether polymer containing a hydrocarbon group according to the present invention comprises the step of polymerizing vinyl ether represented by the following formula (1): ##STR00001## wherein R.sup.1 represents an aliphatic hydrocarbon group having 1 to 10 carbons or an alicyclic hydrocarbon group having 3 to 10 carbons,
in the presence of water as a polymerization solvent and an organic azo-based compound as a radical polymerization initiator, under pH of 6 or more.

A negative resist composition includes a resin (A1) including a structural unit represented by formula (a2-1) and a structural unit represented by formula (a2-4), a novolak resin (A2), a resin (A3) including a structural unit represented by formula (a3-1) and a structural unit represented by formula (a3-2), a crosslinking agent (E) and an acid generator (B):

##STR00001##

A negative resist composition includes a resin (A1) including a structural unit represented by formula (a2-1) and a structural unit represented by formula (a2-4), a novolak resin (A2), a resin (A3) including a structural unit represented by formula (a3-1) and a structural unit represented by formula (a3-2), a crosslinking agent (E) and an acid generator (B):

##STR00001##