Sound hydrophobic polymeric surfacing
A solid surface comprises (i) from 45 to 80 volume fraction percent of polymethylmethacrylate or unsaturated polyester or a combination of both, (ii) from 25 to 55 volume fraction percent of inorganic filler particles distributed evenly throughout the solid surface, and (iii) from 0.75 to 8 volume fraction percent of a siloxane fluid, wherein, when the filler has a major dimension of from 30-50 micrometers, the siloxane has a molecular weight of from 40,000 to 150,000 or when the filler has a major dimension of from 10-15 micrometers, the siloxane has a molecular weight of from 25,000 to 100,000 or when or when the filler has a major dimension of from 1-10 micrometers, the siloxane has a molecular weight of from 5,000 to 100,000.
1. A solid surface comprising
(i) from 45 to 80 volume fraction percent of polymethylmethacrylate or unsaturated polyester or a combination of both,
(ii) from 25 to 55 volume fraction percent of inorganic filler particles distributed evenly throughout the solid surface, and
(iii) from 0.75 to 8 volume fraction percent of a siloxane fluid wherein, when the filler has a major dimension of from 30-50 micrometers, the siloxane has a molecular weight of from 40,000 to 150,000 or when the filler has a major dimension of from 10-15 micrometers, the siloxane has a molecular weight of from 25,000 to 100,000 or when or when the filler has a major dimension of from 1-10 micrometers, the siloxane has a molecular weight of from 5,000 to 100,000.
2. The surface of claim 1 wherein the filler is alumina trihydrate, alumina, talc, quartz or a micronized polymer.
3. The surface of claim 1 wherein the siloxane fluid is a siloxane polymer with hydrocarbon substituents.
4. The surface of claim 1 wherein the siloxane fluid is coated onto the surface of the filler.
5. The surface of claim 1 further comprising either alone or in combination, a pigment, a coupling agent or a crosslinker.
6. The surface of claim 3 wherein the siloxane polymer is polydimethylylsiloxane.
7. The surface of claim 6 wherein the polydimethylylsiloxane is methyl-terminated polydimethylylsiloxane.