Solid surface materials with polyurethane matrix

A solid surface material comprising

• a) a polyurethane matrix comprising as building blocks
• (i) at least one polyol A1 having an OH-content of at least 25 wt.-%, wherein the at least one polyol A1 is selected from the group consisting of glycerol, propanediol, butanediol, 1,2,10-decanetriol, 1,2,8-octanetriol, 1,2,3-trihydroxybenzene, 1,1,1-trimethylolpropane, 1,1,1-trimethylolethane, penthaerythrol and sugar polyols;
• and
• (ii) at least one polyisocyanate A2 comprising at least 60 wt.-% of aliphatic polyisocyanates;
• wherein the polyol A1 makes up at least 95 wt.-% of all hydroxyl-functional compounds in the polyurethane matrix;
• and
• b) at least one organic filler B1, at least one inorganic filler B2, wherein the inorganic filler B2 is not dried and comprises a water content of at least 0.15 wt.-%, and expandable microspheres,
• wherein the solid surface material is formed by a reaction molding process.

A method for manufacturing a solid surface material comprising the steps of

• a) mixing of (i) at least one polyol A1 having an OH-content of at least 25 wt.-%, wherein the at least one polyol A1 is selected from the group consisting of glycerol, propanediol, butanediol, 1,2,10-decanetriol, 1,2,8-octanetriol, 1,2,3-trihydroxybenzene, 1,1,1-trimethylolpropane, 1,1,1-trimethylolethane, penthaerythrol and sugar polyols, (ii) at least one polyisocyanate A2 comprising at least 60 wt.-% of aliphatic and cycloaliphatic polyisocyanates, (iii) at least one organic filler B1, (iv) at least one inorganic filler B2, wherein the inorganic filler B2 is not dried and comprises a water content of at least 0.15 wt.-%, and (v) expandable microspheres;
• wherein the polyol A1 makes up at least 80 wt.-% of all hydroxyl-functional compounds in the reaction mixture obtained in method step a);
• b) filling of the reaction mixture obtained in method step a) into a closed mold;
• and
• c) curing of the reaction mixture,
• wherein the method is a reaction molding process.