Weather-resistant hard coat composition for glass-substitute substrate, cured product, and laminate

A weather-resistant hard coat composition for a glass-substitute substrate, wherein a below-defined pencil hardness of a cured product obtained by curing the composition under the following curing conditions is not less than H, a color difference (ΔE) as defined below is less than 20, and a glossiness retention rate as defined below is not less than 15%,

• Curing conditions
• Pre-baking:
• at 150° C. for 2 minutes
• UV radiation:
• radiation dosage:
• 400 mJ/cm2, radiation intensity:
• 260 mW/cm2
• Aging:
• at 120° C. for 0.5 hours
• Pencil hardness
• Measured in accordance with JIS K5600-5-4 (750 g load).
• Color difference (ΔE)
• The color difference (ΔE) is determined from an initial hue value and the hue of the sample after 3000 hours of radiation in a high luminance xenon weatherometer test under the following conditions.
• Glossiness retention rate (%)
• The glossiness retention rate is calculated from the following equation by measuring the glossiness before radiation and the glossiness after radiation for 3000 hours in the high luminance xenon weatherometer test under the following conditions,
• Glossiness Retention Rate (%)=(Glossiness after radiation for 3000 hours)/(Glossiness before radiation)×100
• High luminance xenon weatherometer test
• Test temperature:
• 63° C.
• Test humidity:
• RH 50%
• Rain:
• 18 minutes of rain per 120 minutes
• Radiation illuminance:
• 100 W/m2 (300 to 400 nm)
• Filter:
• inside/outside=borosilicate type S/borosilicate type S
• Radiation time:
• 3000 hours.