Coating composition, hydrophilic member and production method thereof

A hydrophilic member comprising:

• a support;
• and
• a hydrophilic film that is formed by applying a coating composition onto the support and heating the coating composition, thereby decomposing a thermally-decomposing group in the coating composition to give a hydrophilic group,
• wherein the coating composition comprises:
• (A) a thermally-decomposing polymer selected from a thermally-decomposing polymer (1) and a thermally-decomposing polymer (2), and
• (B) an alkoxide compound of an element selected from Si, Ti, Zr and Al,
• wherein the thermally-decomposing polymer (1) has a structural unit represented by the following general formula (I-a) and a structural unit represented by the following general formula (I-b), and
• the thermally-decomposing polymer (2) has a structural unit represented by the following general formula (II-b) and has a functional group represented by the following general formula (II-a) at the terminal of the polymer chain:
• wherein R1 to R15 each independently represents a hydrogen atom or a hydrocarbon group having 8 or less carbon atoms,
• L1, L2 and L4 each independently represents a single bond or a polyvalent organic linking group,
• L3 represents a divalent organic linking group,
• m1 and m2 each independently represents an integer of from 1 to 3, and
• x and y each is a number of from 0 to 1 00 with the proviso that x+y=100.

A production method of a hydrophilic member comprising:

• a process of preparing a coating composition that comprises:
• (A) a thermally-decomposing polymer selected from a thermally-decomposing polymer (1) and a thermally-decomposing polymer (2), and
• (B) an alkoxide compound of an element selected from Si, Ti, Zr and Al;
• a process of applying the coating composition onto a support;
• a process of heating the coating composition to form a hydrophilic film, thereby decomposing a thermally-decomposing group in (A) the thermally-decomposing polymer to give a hydrophilic group,
• wherein the thermally-decomposing polymer (1) has a structural unit represented by the following general formula (I-a) and a structural unit represented by the following general formula (I-b), and
• the thermally-decomposing polymer (2) has a structural unit represented by the following general formula (II-b) and has a functional group represented by the following general formula (II-a) at the terminal of the polymer chain:
• wherein R1 to R15 each independently represents a hydrogen atom or a hydrocarbon group having 8 or less carbon atoms,
• L1, L2 and L4 each independently represents a single bond or a polyvalent organic linking group,
• L3 represents a divalent organic linking group,
• m1 and m2 each independently represents an integer of from 1 to 3, and
• x and y each is a number of from 0 to 100 with the proviso that x+y=100.

A coating composition comprising:

• (A′) a hydrophilic polymer selected from a hydrophilic polymer (1) and a hydrophilic polymer (2);
• and
• (B) an alkoxide compound of an element selected from Si, Ti, Zr and Al,
• wherein the hydrophilic polymer (1) is formed by heating a thermally-decomposing polymer (1) having a structural unit represented by the following general formula (I-a) and a structural unit represented by the following general formula (I-b), thereby decomposing a thermally-decomposing group in the thermally-decomposing polymer (1) to give a hydrophilic group, and
• the hydrophilic polymer (2) is formed by heating a thermally-decomposing polymer (2) having a structural unit represented by the following general formula (II-b) and has a functional group represented by the following general formula (II-a) at the terminal of the polymer chain, thereby decomposing a thermally-decomposing group in the thermally-decomposing polymer (2) to give a hydrophilic group:
• wherein R1 to R15 each independently represents a hydrogen atom or a hydrocarbon group having 8 or less carbon atoms,
• L1, L2 and L4 each independently represents a single bond or a polyvalent organic linking group,
• L3 represents a divalent organic linking group,
• m1 and m2 each independently represents an integer of from 1 to 3, and
• x and y each is a number of from 0 to 100 with the proviso that x+y=100.

A hydrophilic member comprising:

• a support;
• and
• a hydrophilic film that is formed by applying a coating composition onto the support, and heating and drying the coating composition,
• wherein the coating composition comprises:
• (A′) a hydrophilic polymer selected from a hydrophilic polymer (1) and a hydrophilic polymer (2), and
• (B) an alkoxide compound of an element selected from Si, Ti, Zr and Al,
• wherein the hydrophilic polymer (1) is formed by heating a thermally-decomposing polymer (1) having a structural unit represented by the following general formula (I-a) and a structural unit represented by the following general formula (I-b), thereby decomposing a thermally-decomposing group in the thermally-decomposing polymer (1) to give a hydrophilic group, and
• the hydrophilic polymer (2) is formed by heating a thermally-decomposing polymer (2) having a structural unit represented by the following general formula (II-b) and has a functional group represented by the following general formula (II-a) at the terminal of the polymer chain, thereby decomposing a thermally-decomposing group in the thermally-decomposing polymer (2) to give a hydrophilic group:
• wherein R1 to R15 each independently represents a hydrogen atom or a hydrocarbon group having 8 or less carbon atoms,
• L1, L2 and L4 each independently represents a single bond or a polyvalent organic linking group,
• L3 represents a divalent organic linking group,
• m1 and m2 each independently represents an integer of from 1 to 3, and
• x and y each is a number of from 0 to 100 with the proviso that x+y=100.

A production method of a hydrophilic member comprising:

• a process of preparing a coating composition that comprises:
• (A′) a hydrophilic polymer selected from a hydrophilic polymer (1) and a hydrophilic polymer (2), and
• (B) an alkoxide compound of an element selected from Si, Ti, Zr and Al, heating (A) a thermally-decomposing polymer to form (A′) a hydrophilic polymer;
• a process of applying the coating composition onto a support;
• and
• a process of heating and drying the coating composition to form a hydrophilic film,
• wherein the hydrophilic polymer (1) is formed by heating a thermally-decomposing polymer (1) having a structural unit represented by the following general formula (I-a) and a structural unit represented by the following general formula (I-b), thereby decomposing a thermally-decomposing group in the thermally-decomposing polymer (1) to give a hydrophilic group and
• the hydrophilic polymer (2) is formed by heating a thermally-decomposing polymer (2) having a structural unit represented by the following general formula (II-b) and has a functional group represented by the following general formula (II-a) at the terminal of the polymer chain, thereby decomposing a thermally-decomposing group in the thermally-decomposing polymer (2) to give a hydrophilic group:
• wherein R1 to R15 each independently represents a hydrogen atom or a hydrocarbon group having 8 or less carbon atoms,
• L1, L2 and L4 each independently represents a single bond or a polyvalent organic linking group,
• L3 represents a divalent organic linking group,
• m1 and m2 each independently represents an integer of from 1 to 3, and
• x and y each is a number of from 0 to 100 with the proviso that x+y=100.