Acrylic compositions
View Patent ↗The present invention relates to a thermoformable sheet, for example, an acrylic sheet, comprising particles proximate to the top surface, wherein the textured sheet, when thermoformed, provides a low-gloss, textured surface that is less sensitive to marring, blemishes (including blemishes resulting from the mold), household wear and tear, and visibly reduces the appearance of oil deposits on its surface.
1. A process, comprising a) dispersing particles in a carrier to form a particle mixture; b) mixing said particle mixture with a curable composition, whereupon contact with the particles causes said particles to swell; and c) curing said curable composition, prior to the particles substantially swelling, to form a thermoformable sheet, wherein said carrier is inert relative to said curable composition.
2. The process of claim 1 wherein said particles comprise a polyacrylate polymer.
3. The process of claim 1 wherein said curable composition comprises an unsaturated material whereupon contact with said particles causes the particles to swell.
4. The process of claim 1 wherein said thermoformable sheet comprises said particles that have a Young's modulus higher than the Young's modulus of said cured composition.
5. The process of claim 1 wherein said thermoformable sheet forms a textured surface upon thermoforming.
6. The process of claim 1 wherein said thermoformable sheet has a top surface that is substantially opposite a bottom surface, wherein said top surface does not contact a mold during thermoforming, and said top surface of the thermoformable sheet has a higher gloss than the gloss of said top surface after thermoforming.
7. The process of claim 1 wherein said thermoformable sheet has a top surface that is substantially opposite of bottom surface, wherein greater than 50% of the particles are present in an area defined by said top surface and a parallel plane equidistant from said top surface and said bottom surface.
8. The process of claim 1 wherein said thermoformable sheet has a top surface that is substantially opposite a bottom surface, wherein greater than 95% of the particles are present in an area defined by said top surface and a parallel plane positioned between said top surface and said bottom surface at a distance that is five times closer to said bottom surface than said top surface.
9. The process of claim 1 wherein at least 80% of said particles have a Young's modulus greater than 400,000 Psi.
10. The process of claim 1 wherein said particles have an average diameter of between 150 μm and 590 μm.
11. The process of claim 1 wherein the thermoformable sheet comprises between 0.1-5 wt % particles.
12. The process of claim 1 wherein said curing is initiated within 5 minutes of said mixing.
13. A thermoformable acrylic sheet having a top surface and an opposing bottom surface comprising: a) a particle mixture with particles dispersed in a carrier; and b) an acrylic matrix, wherein said carrier is inert relative to said matrix, whereupon contact of the particles with said matrix cause said particles to swell, and wherein greater than 50% of said particles are present in an area defined by said top surface and a parallel plan substantially equidistant from said top and bottom surfaces.
14. The sheet of claim 13 wherein greater than 95% of the particles are present in an area defined by said top surface and a parallel plane positioned between said top surface and said bottom surface at a distance that is five times closer to said bottom surface than said top surface.
15. The sheet of claim 13 wherein at least 80% of said particles are substantially un-swollen.
16. The sheet of claim 13 wherein said particles have an average diameter of between 150 μm and 590 μm.
17. An article formed from the sheet according to claim 13 wherein said top surface comprises between 2-40 protrusions per square centimeter.
18. The article of claim 17 wherein said top surface comprises protrusions that extend between 0.8 to 0.14 mm above the surface on average.
19. The article of claim 17 wherein said top surface comprises protrusions that have an average diameter of between 0.8 to 1.2 mm.
20. The process according to claim 1 , wherein said carrier is a plasticizer.
21. The process according to claim 20 , wherein said plasticizer is dibutyl phthalate.
22. The thermoformable acrylic sheet according to claim 13 , wherein said carrier is a plasticizer.
23. The thermoformable acrylic sheet according to claim 22 , wherein said plasticizer is dibutyl phthalate.