Silsesquioxane derivative having radical polymerizable functional group, composition thereof, and cured film having low cure shrinkage

A resin composition, containing acrylic resin (A) and at least one kind selected from silsesquioxane derivatives (B) represented by formula (1), (2) or (3),

• wherein, in the silsesquioxane derivative represented by formula (1), (2) or (3),
• R1 is a group independently selected from alkyl having 1 to 45 carbons, cycloalkyl having 4 to 8 carbons, aryl having 6 to 14 carbons and arylalkyl having 7 to 24 carbons;
• and in the alkyl having 1 to 45 carbons, at least one hydrogen may be replaced by fluorine, and at least one non-adjacent-CH2— may be replaced by —O— or —CH═CH—;
• in a benzene ring in the aryl and the arylalkyl, at least one hydrogen may be replaced by halogen or alkyl having 1 to 10 carbons, and in the alkyl having 1 to 10 carbons, at least one hydrogen may be replaced by fluorine, and at least one non-adjacent —CH2— may be replaced by —O— or —CH═CH—;
• the number of carbons of alkylene in the arylalkyl is 1 to 10, and at least one non-adjacent-CH2— may be replaced by —O—,
• R2 and R3 are a group independently selected from alkyl having 1 to 10 carbons, cyclopentyl, cyclohexyl and phenyl,
• X is independently hydrogen or a monovalent organic group, in which at least one of X is a radically polymerizable functional group represented by formula (4);
• and
• in formula (4), 1 is an integer from 0 to 10, m is an integer from 0 to 10, n is 0 or 1, p is an integer from 0 to 10, q is 0 or 1, r is 0 or 1, s is an integer from 0 to 10, R4 is a hydroxyl group, R5 is hydrogen or methyl, R6 is an organic group having 4 to 6 carbons, and having an acryloyl group or a methacryloyl group, R7 is hydrogen or methyl;
• and arbitrary —CH2— may be replaced by —O—;
• in which a case where two oxygens are bonded with each other (—O—O—) is excluded, in X of the silsesquioxane derivative represented by formula (1), when all of m, n, p, q and r are 0, and R7 is methyl, a sum:
• 1+s is an integer from 4 or more, and in X of the silsesquioxane derivative represented by formula (2), when all of m, n, p, q and r are 0, a sum:
• 1+s is an integer from 4 or more:

A laminate, including:

• a base material;
• and
• a cured film formed by curing the resin composition containing at least acrylic resin (A) and at least one kind selected from silsesquioxane derivatives (B) represented by formula (1), (2) or (3) on the base material, and the laminate,
• in which a warpage height of the base material with the cured film, on the resin composition, is 0 millimeter or more and 4 millimeters or less by evaluation method 1, and adhesion after 120 hours is rated to be 4B or more for all in an adhesion evaluation by evaluation method 2:
• and in the formulas (1) to (3), R1 is a group independently selected from alkyl having 1 to 45 carbons, cycloalkyl having 4 to 8 carbons, aryl having 6 to 14 carbons and arylalkyl having 7 to 24 carbons;
• and in the alkyl having 1 to 45 carbons, at least one hydrogen may be replaced by fluorine, and at least one non-adjacent —CH2— may be replaced by —O— or —CH═CH—;
• in a benzene ring in the aryl and the arylalkyl, at least one hydrogen may be replaced by halogen or alkyl having 1 to 10 carbons, and in the alkyl having 1 to 10 carbons, at least one hydrogen may be replaced by fluorine, and at least one non-adjacent —CH2— may be replaced by —O— or —CH═CH—;
• and the number of carbons of alkylene in the arylalkyl is 1 to 10, and at least one non-adjacent-CH2— may be replaced by —O—,
• R2 and R3 are a group independently selected from alkyl having 1 to 10 carbons, cyclopentyl, cyclohexyl and phenyl,
• X is independently hydrogen or a monovalent organic group, in which at least one of X is a radically polymerizable functional group represented by formula (4);
• and
• in the formula (4), 1 is an integer from 0 to 10, m is an integer from 0 to 10, n is 0 or 1, p is an integer from 0 to 10, q is 0 or 1, r is 0 or 1, s is an integer from 0 to 10, R4 is a hydroxyl group, R5 is hydrogen or methyl, R6 is an organic group having 4 to 6 carbons, and having an acryloyl group or a methacryloyl group, and R7 is hydrogen or methyl;
• and arbitrary —CH2— may be replaced by —O—;
• in which a case where two oxygens are bonded with each other (—O—O—) is excluded;
• in X of the silsesquioxane derivative represented by formula (1), when all of m, n, p, q and r are 0 and R7 is methyl, a sum:
• 1+s is an integer from 4 or more;
• and in X of the silsesquioxane derivative represented by formula (2), when all of m, n, p, q and r are 0, a sum:
• 1+s is an integer from 4 or more:
• and
• evaluation method 1
• a cured film each having a thickness of 2.5 to 6 micrometers and composed of the resin composition is formed on a 50 micrometer-thick polyethylene terephthalate (PET) film base material on which an easy-adhesive layer may be formed;
• the resulting PET with the cured film is cut into a lattice of 15 cm×15 cm, and the resulting square is allowed to stand with the cured film upward under an atmosphere of 25° C. and 50% RH for 24 hours or more, and then each height of the cured film lifted on four corners on a horizontal table is measured, and a mean value of the total of heights is taken as a measured value (unit:
• mm);
• and
• a case of curling downward (U shape) is taken as a positive value, and a case of curling upward (inverted U shape) is taken as a negative value:
• evaluation method 2
• a cured film each having a thickness of 2.5 to 6 micrometers and composed of the resin composition is formed on a 50 micrometer-thick polyethylene terephthalate (PET) film base material on which an easy-adhesive layer may be formed;
• on the resulting PET with the cured film, in accordance with ASTM D3359 (Method B),
• an adhesion test is performed by using a crosscut adhesion method with 25 lattice patterns at a spacing of 1 millimeter;
• and then the PET with the cured film after performing the adhesion test is put into a constant temperature and humidity chamber at 85° C. and 85% RH for 120 hours, and then the resulting material is took out therefrom, and in accordance with ASTM D3359 (Method B),
• an adhesion test is performed by using a crosscut adhesion method with 25 lattice patterns at a spacing of 1 millimeter;
• and evaluation criteria are as described below:
• 5B:
• 0% in percent area removed;
• 4B:
• less than 5% in percent area removed;
• 3B:
• 5% or more and less than 15% in percent area removed;
• 2B:
• 15% or more and less than 35% in percent area removed;
• 1B:
• 35% or more and less than 65% in percent area removed;
• and
• 0B:
• 65% or more in percent area removed.