Transparent noncombustible sheet
The present invention addresses the problem of providing a transparent, noncombustible sheet having excellent transparency but minimized blurring and color bleeding. The means for addressing the problem is a transparent noncombustible sheet including a glass fiber fabric and a cured resin composition layer impregnated into the glass fiber fabric; wherein, the cured resin composition layer is formed by curing a resin composition including a curable resin and a bifunctional (meth)acrylate, total light transmittance of the transparent noncombustible sheet being no less than 80%, and haze of the transparent noncombustible sheet being no more than 30%.
1. A transparent noncombustible sheet comprising glass fiber fabric and a cured resin composition layer prepared by allowing the glass fiber fabric to be impregnated with a resin composition,
wherein the cured resin composition layer is formed of a cured product of the resin composition containing a curable resin and a bifunctional (meth)acrylate,
two pieces of glass fiber fabric are arranged at respective surface sides of the cured resin composition layer while the center part in the thickness direction of the piece of glass fiber fabric is positioned nearer to the surface side than the center part in the thickness direction of the cured resin composition layer, wherein each piece of glass fiber fabric comprises a warp and a weft;
the proportion of the glass fiber fabric in the total amount of the glass fiber fabric and the cured resin composition layer is 20 to 50% by mass,
the total light transmittance of the transparent noncombustible sheet is greater than or equal to 80%, and
the haze value of the transparent noncombustible sheet is less than or equal to 30%.
2. The transparent noncombustible sheet according to claim 1 , wherein the bifunctional (meth)acrylate is a di(meth)acrylate of an alkylene diol with 1 to 6 carbon atoms.
3. The transparent noncombustible sheet according to claim 1 , wherein the molecular weight of the bifunctional (meth)acrylate is less than or equal to 250.
4. The transparent noncombustible sheet according to claim 3 , wherein the molecular weight of the bifunctional (meth)acrylate is greater than or equal to 150.
5. The transparent noncombustible sheet according to any one of claims 1 to 4 , wherein the resin composition contains a styrene monomer.
6. The transparent noncombustible sheet according to claim 1 , wherein the resin composition is photocurable.
7. The transparent noncombustible sheet according to claim 1 , wherein the resin composition contains 40 to 80% by mass of the curable resin and 10 to 40% by mass of the bifunctional (meth)acrylate.
8. The transparent noncombustible sheet according to claim 1 , wherein the resin composition contains 60 to 80% by mass of the curable resin and 10 to 20% by mass of the bifunctional (meth)acrylate.
9. The transparent noncombustible sheet according to claim 1 , wherein the proportion of the glass fiber fabric in the total amount of the glass fiber fabric and the cured resin composition layer is 20 to 28% by mass.
10. The transparent noncombustible sheet according to claim 1 , further comprising a film layer disposed on the cured resin composition layer.
11. The transparent noncombustible sheet according to claim 10 , further comprising a net body layer which is composed of a glass fiber net body and interposed between the cured resin composition layer and the film layer.
12. The transparent noncombustible sheet according to claim 1 , wherein the transparent noncombustible sheet has a thickness of 40 to 400 μm.
13. The transparent noncombustible sheet according to claim 1 , wherein a plurality of pieces of glass fiber fabric are included in the identical cured resin composition layer, at least two pieces of glass fiber fabric among the plurality of pieces of glass fiber fabric are arranged at least at respective surface sides of the cured resin composition layer, and the two pieces of glass fiber fabric are included at respective surface sides of the cured resin composition layer while the shortest distance L 1 from the surface of the cured resin composition layer to the center part of the piece of glass fiber fabric and the thickness L 0 of the cured resin composition layer satisfy the relationship of the following equation (I):
0(%)< L 1 /L 0 ×100<30(%) (I).
14. A smoke-proof hanging wall comprising the transparent noncombustible sheet according to claim 1 .
15. A smoke-proof shutter comprising the transparent noncombustible sheet according to claim 1 .
16. A partition wall comprising the transparent noncombustible sheet according to claim 1 .
17. A smoke-proof curtain comprising the transparent noncombustible sheet according to claim 1 .
18. A touch panel comprising the transparent noncombustible sheet according to claim 1 .