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US 5,705,552 AGranted
Thermoformable acrylic sheet having uniform distribution of color and mineral filler
AssigneeAristech Chemical Corporation
InventorsEttore Minghetti, John E. Eitel, Carol A. Wetter
Life of this patent
Estimating the term…
Abstract
A composition suitable for making thermoformable sheets and the like. The composition comprises a crosslinked poly (methyl methacrylate) typically having uncrosslinked poly (methyl methacrylate) dispersed therein. The composition a comprises 0.5 to about 1.0 pph of at least one crosslinking agent x, and up to about 0.58x-0.28 pph of a at least one chain terminator. The composition also comprises about 0.1 to 8 pph poly (methyl methacrylate) compatible plasticizer, and has about 20 to 60 wt % solid particle dispersed therein.
Claims4
A composition comprising:
- (a) a syrup comprising methyl methacrylate and having a polymerizable portion;
- (b) 0.5 to about 1.0 parts per hundred, based on the weight of the polymerizable portion, of a crosslinking agent x, said crosslinking agent being dispersed within said syrup;
- (c) y parts per hundred of a chain terminator, based on the weight the polymerizable portion, said chain terminator being dispersed within said syrup, and wherein y is less than 0.58x-0.28;
- (d) about 0.1 to 8 parts per hundred, based on the weight of the polymerizable portion, of at least one poly (methyl methacrylate) compatible plasticizer;
- and
- (e) a plurality of solid particles, said particles passing through a sieve having openings of 90 microns, said particles comprising about 20 to 60 wt % of said composition, and wherein a one-half inch thick flat sheet made from said composition will have a minimum bending radius of less than three inches.
3 more elements
Dependencies are inferred from the claim text.