Pre-impregnated product
A prepreg can be obtained by impregnating a decorative base paper with an impregnating resin solution which contains at least one polymer latex and at least one modified starch with a specific molecular weight distribution.
1. A prepreg obtained by impregnating a decorative base paper with an impregnating resin solution, wherein the impregnating resin solution comprises at least one polymer latex and at least one modified starch with a specific molecular weight distribution, wherein the molecular weight of the starch molecules is:
(a) at most 6% by weight of molecules with a molecular weight of 0 to 1,000 g/mol;
(b) 5% to 20% by weight of molecules with a molecular weight of 1,000 to 5,000 g/mol;
(c) 20% to 40% by weight of molecules with a molecular weight of 5,000 to 25,000 g/mol;
(d) 20% to 45% by weight of molecules with a molecular weight of 25,000 to 200,000 g/mol;
(e) 5% to 22% by weight of molecules with a molecular weight of 200,000 to 1,000,000 g/mol;
(f) 0.5% to 5% by weight of molecules with a molecular weight of more than 1,000,000 g/mol.
2. The prepreg of claim 1 , wherein the polymer latex is a styrene-(meth)acrylic acid ester copolymer.
3. The prepreg of claim 2 , wherein the polymer latex is a styrene-butyl acrylate.
4. The prepreg of claim 3 , wherein the ratio of quantitative starch to polymer latex is in the range of 20:80 to 80:20, with respect to the mass of the impregnating resin (b.d.).
5. The prepreg of claim 4 , wherein the ratio is in the range of 45:55 to 65:35 with respect to the mass of impregnating resin (b.d.).
6. The prepreg of claim 5 , wherein the impregnating resin solution contains 1 to 30% by weight of a pigment and/or a filler, with respect to the mass of binding agent (b.d.).
7. The prepreg of claim 6 , wherein the pigment can be titanium dioxide, kaolin, bentonite and/or calcium carbonate.
8. The prepreg of claim 7 , wherein the impregnating resin solution has a solids content of 9 to 40% by weight.
9. The prepreg of claim 8 , wherein the quantity of impregnating resin is 10 to 35% by weight of the basis weight of the decorative base paper.
10. A decorative paper or decorative coating material obtained from the prepreg of claim 9 .
11. A decorative paper or decorative coating material obtained from the prepreg of claim 1 .