Laminate including surface layer having scratch resistance and matte properties and surface coating composition
Provided is a laminate including a surface layer that has excellent matte properties and can obtain good results in both the needle scratch test and the nail scratch test, and a surface coating composition that can prepare such a surface layer.
1 . A laminate comprising:
a substrate; and
a surface layer having scratch resistance and matte properties that includes resin beads having an average particle size of approximately 1 micrometer or greater and approximately 20 micrometers or less, and having a glass transition temperature of higher than approximately-30° C. and lower than approximately 34° C., and a binder,
wherein the surface layer contains the resin beads of less than approximately 75% by mass based on a total weight of the surface layer, and exhibits an elastic modulus of approximately 5 MPa or greater and approximately 65 MPa or less in a region other than the resin beads of the surface layer when the elastic modulus of the surface layer is measured using an atomic force microscope.
2 . The laminate according to claim 1 , wherein the surface layer has a 60-degree surface glossiness of 5.0 GU or less.
3 . The laminate according to claim 1 , wherein the binder contains a resin having a urethane bond.
4 . The laminate according to claim 1 , wherein the binder contains a resin having a carboxy group.
5 . The laminate according to claim 1 , wherein the binder includes a crosslinked product crosslinked with a crosslinking composition.
6 . The laminate according to claim 1 , which is used as an interior material or exterior material for buildings or vehicles.
7 . The laminate according to claim 1 , wherein the surface layer further contains an antifoulant.
8 . The laminate according to claim 7 , wherein the antifoulant contains a silicone resin having a urethane bond.
9 . A surface coating composition comprising:
resin beads having an average particle size of 1 micrometer or greater and 20 micrometers or less and a glass transition temperature of higher than-30° C. and lower than 34° C.; and
a binder precursor,
wherein the resin beads are less than 75% by mass based on solid content of 100 parts by mass of the surface coating composition, and wherein a surface layer made from the surface coating composition exhibits an elastic modulus of 5 MPa or greater and 65 MPa or less in a region other than the resin beads of the surface layer when the elastic modulus of the surface layer is measured using an atomic force microscope.
10 . The surface coating composition according to claim 9 , wherein the binder precursor contains a resin having a urethane bond.
11 . The surface coating composition according to claim 9 , further comprising an antifoulant.
12 . The surface coating composition according to claim 9 , which is a water-based composition.
13 . The surface coating composition according to claim 9 , wherein a mass ratio of the water-based isocyanate to the binder precursor is 30% or greater and less than 400% in terms of solid content, and wherein the surface coating composition comprises 0.5 parts by mass or greater of the polyether-modified silicone having a hydroxyl group based on 100 parts by mass of solid content of the surface coating composition.
14 . The surface coating composition according to claim 12 , further comprising:
water-based isocyanate; and
polyether-modified silicone having a hydroxyl group as the antifoulant.
15 . The surface coating composition according to claim 12 , wherein the binder precursor contains a resin having a carboxy group.