The present invention provides a novel metal corrosion inhibitor containing a compound having a specific structure. The present invention relates to a metal corrosion inhibitor including a compound (X) including one molecule of a mercaptocarboxylic acid or a mercaptocarboxylic acid salt; one molecule of acrylic acid, an acrylic acid salt, or an acrylic acid ester; and one molecule of a monomer (B) represented by the following formula (1), which are bonded to each other:

##STR00001##

The present invention provides a novel metal corrosion inhibitor containing a compound having a specific structure. The present invention relates to a metal corrosion inhibitor including a compound (X) including one molecule of a mercaptocarboxylic acid or a mercaptocarboxylic acid salt; one molecule of acrylic acid, an acrylic acid salt, or an acrylic acid ester; and one molecule of a monomer (B) represented by the following formula (1), which are bonded to each other:

##STR00001##

The present invention provides a monomer mixture that rapidly cures even in high humidity environments, and is useful as a raw material for a curable composition that forms a cured product having excellent adhesion to metals and glass, as well as of course to paper and plastic. The monomer mixture according to an embodiment of the present invention contains two or more types of cationically polymerizable monomers. The monomer mixture contains, as the cationically polymerizable monomers, a compound (A) having a vinyl ether group and a hydroxyl group; a compound (B) having an oxetanyl group and a hydroxyl group; and a compound (C) represented by Formula (c) below. A total content of the compound (A), the compound (B), and the compound (C) is 50 wt. % or greater of the total amount of the monomer mixture, and a content [A] of the compound (A) and a content [B] of the compound (B) satisfy Relationship (1) below.
A/(A+B)≥0.3  (1) ##STR00001##

The present invention provides a monomer mixture that rapidly cures even in high humidity environments, and is useful as a raw material for a curable composition that forms a cured product having excellent adhesion to metals and glass, as well as of course to paper and plastic.

The monomer mixture according to an embodiment of the present invention contains two or more types of cationically polymerizable monomers. The monomer mixture contains, as the cationically polymerizable monomers, a compound (A) having a vinyl ether group and a hydroxyl group; a compound (B) having an oxetanyl group and a hydroxyl group; and a compound (C) represented by Formula (c) below. A total content of the compound (A), the compound (B), and the compound (C) is 50 wt. % or greater of the total amount of the monomer mixture, and a content [A] of the compound (A) and a content [B] of the compound (B) satisfy Relationship (1) below.

A/(A+B)0.3(1)

##STR00001##

An ink composition includes an acrylic resin including a polymerization product of a first monomer having a hydroxyl group, a second monomer having an epoxy group, a third monomer having an acrylate group, and a fourth monomer having a substituted or unsubstituted phenyl group, a first curing agent having an isocyanate group, and a second curing agent having an amine group. Durability and abrasion resistance of a window may be improved.

An ink composition includes an acrylic resin including a polymerization product of a first monomer having a hydroxyl group, a second monomer having an epoxy group, a third monomer having an acrylate group, and a fourth monomer having a substituted or unsubstituted phenyl group, a first curing agent having an isocyanate group, and a second curing agent having an amine group. Durability and abrasion resistance of a window may be improved.

[Object] To provide a method for producing a vinyl ether polymer having a hydroxyl group on the side chain, wherein the vinyl ether polymer having a low viscosity and excellent workability and processability is produced in a simple and efficient method. [Means for solving problem] The present invention relates to a method for producing a vinyl ether polymer having a hydroxyl group on the side chain, characterized in that vinyl ether comprising a hydroxyl group is subjected to radical polymerization by using an oil-soluble azo polymerization initiator, in the presence of a mixed solvent comprising water and an organic solvent selected from alcohol or cyclic ether radical polymerization.

[Object] To provide a method for producing a vinyl ether polymer having a hydroxyl group on the side chain, wherein the vinyl ether polymer having a low viscosity and excellent workability and processability is produced in a simple and efficient method. [Means for solving problem] The present invention relates to a method for producing a vinyl ether polymer having a hydroxyl group on the side chain, characterized in that vinyl ether comprising a hydroxyl group is subjected to radical polymerization by using an oil-soluble azo polymerization initiator, in the presence of a mixed solvent comprising water and an organic solvent selected from alcohol or cyclic ether radical polymerization.

[Object] To provide a method for producing a vinyl ether polymer containing an oxyethylene chain 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 an oxyethylene chain 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 alkyl group having 1 to 3 carbons, and n represents an integer from 1 to 10,
in the presence of water as a polymerization solvent, a basic compound as an additive, and an organic azo-based compound as a radical polymerization initiator, and in pH of 5 or more.

[Object] To provide a method for producing a vinyl ether polymer containing an oxyethylene chain 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 an oxyethylene chain 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 alkyl group having 1 to 3 carbons, and n represents an integer from 1 to 10,
in the presence of water as a polymerization solvent, a basic compound as an additive, and an organic azo-based compound as a radical polymerization initiator, and in pH of 5 or more.