Resin composition and manufacturing method of coating layer using the same

A manufacturing method of a coating layer, the method comprising:

• forming a resin composition by mixing a first polyol represented by Chemical Formula 1, a second polyol represented by Chemical Formula 2, and a polyisocyanate together with a first solvent;
• coating the resin composition on a substrate;
• and
• aging the resing composition,
• wherein the first polyol and the second polyol have a linear structure without a side chain,
• wherein, in Chemical Formula 1 and Chemical Formula 2, each of Y1 to Y4 is H or OH—, at least one of Y1 and Y2 is OH—, at least one of Y3 and Y4 is OH—,
• each of X1 to X3 is independently selected from an unsubstituted C1-C20 alkyl group, and a C1-C20 alkyl group substituted with at least one selected from an unsaturated bond, —CH2— in the alkyl group may be substituted or unsubstituted with —CHOH—,
• each of n and m is independently 1 to 200,
• wherein the aging the resin composition includes a plurality of heating acts,
• wherein the plurality of heating acts include a first heating act to a sixth heating act which are sequentially performed, and
• wherein:
• a process temperature of the first heating act, the second heating act and the sixth heating act is less than a process temperature of the third heating act to the fifth heating act.

A manufacturing method of a coating layer, the method comprising:

• forming a resin composition by mixing a first polyol represented by Chemical Formula 1, a second polyol represented by Chemical Formula 2, and a polyisocyanate together with a first solvent;
• coating the resin composition on a substrate;
• and
• aging the resing composition,
• wherein the first polyol and the second polyol have a linear structure without a side chain,
• wherein, in Chemical Formula 1 and Chemical Formula 2, each of Y1 to Y4 is H or OH—, at least one of Y1 and Y2 is OH—, at least one of Y3 and Y4 is OH—,
• each of X1 to X3 is independently selectd from an unsubstituted C1-C20 alkyl group, and a C1-C20 alkyl group substituted with at least one selected from an unsaturated bond, —CH2— in the alkyl group may be substituted or unsubstituted with —CHOH—,
• each of n and m is independently 1 to 200,
• wherein the aging the resin composition includes a plurality of heating acts,
• wherein the plurality of heating acts include a first heating act to a sixth heating act which are sequentially performed, and
• wherein:
• a process temperature of the first heating act is about 30° C. to about 40° C.,
• a process temperature of the third heating act, the fourth heating act, and the fifth heating act is about 100° C. to about 140° C., and
• a process temperature of the second heating act and the sixth heating act is about 70° C. to about 90° C.