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US 5,851,606 AGranted
Thermoformable acrylic resin sheet
AssigneeAtohaas Holding C.V.
InventorEli Visser
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AssigneeAtohaas Holding C.V.
InventorEli Visser
Estimating the term…
The invention relates to a process for producing a thermoformable acrylic resin sheet having a granite-like appearance after thermoforming, wherein ground particles of a methyl methacrylate resin which has been slightly cross-linked by means of 0.005-0.2 wt. % of a polyfunctional monomer, said particles having a size smaller than 1 mm, are incorporated in an amount of 0.3-1.5 wt. % into a liquid methyl methacrylate matrix resin composition containing a cross-linking monomer in an amount which is sufficient for effecting cross-linking of the matrix resin to a degree which is equal to or higher than the degree of cross-linking of the ground resin particles, at least one of the resin particles and the matrix resin composition containing a coloring material providing a color difference between them, whereupon the liquid mixture is brought into a flat mold and is kept therein to allow the resin particles to settle and the mixture is then polymerized to produce the thermoformable acrylic resin sheet. The invention also relates to a thermoformable acrylic resin sheet and to shaped articles having a granite-like appearance.
A process for producing a thermoformable acrylic resin sheet having a granitic appearance and smooth surface after thermoforming, which comprises:
A thermoformable acrylic resin sheet suitable for thermoforming into a shaped article having a granitic appearance and smooth surface, the sheet comprising a polymerized, cross-linked methyl methacrylate matrix resin having embedded therein near one surface of the sheet 0.3-1.5 wt. % of ground resin particles of a methyl methacrylate resin having a size smaller than 1 mm, the particles being slightly cross-linked with 0.005-0.2 wt. % of a polyfunctional monomer, wherein the matrix resin is cross-linked to a degree equal to or higher than the degree of cross-linking of the resin particles, and wherein at least one of the resin particles or the matrix resin contains a coloring material to provide a color difference between them.
A shaped article having a granitic appearance and smooth surface formed from a thermoformable acrylic resin sheet which comprises 0.3-1.5 wt % of ground particles of a methyl methacrylate resin having a size smaller than 1 mm, the methyl methacrylate resin being slightly cross-linked with 0.005-0.2 wt % of a polyfunctional monomer;
Dependencies are inferred from the claim text.