# US 5,705,552 A · Thermoformable acrylic sheet having uniform distribution of color and mineral filler

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- Number: US 5,705,552 A
- Document ID: US5705552A
- Status: Granted
- Kind: A
- Application number: 08/720,164
- Filed: 1996-09-25
- Granted: 1998-01-06
- Earliest claimed: 1993-11-26
- Assignees: Aristech Chemical Corporation
- Inventors: Ettore Minghetti; John E. Eitel; Carol A. Wetter
- Web page: https://patentgrep.com/patent/US5705552A

## CPC

- C08L 51/003: {grafted on to macromolecular compounds obtained by reactions only involving unsaturated carbon-to-carbon bonds (C08L51/04, C08L51/06 take precedence)}
- C04B 26/06: Acrylates
- C08F 265/06: Polymerisation of acrylate or methacrylate esters on to polymers thereof
- C08K 3/22: of metals
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- C04B: LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE {(roofing granules E04D7/005)}; CERAMICS (devitrified glass-ceramics C03C10/00); REFRACTORIES; TREATMENT OF NATURAL STONE
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)

## 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.

## Claims

### Claim 1

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.

### Claim 2 (depends on 1)

A composition according to claim 1 wherein said solid particles comprise alumina trihydrate.

### Claim 3 (depends on 1)

A composition according to claim 1 wherein said chain terminator is n-dodecyl mercaptan.

### Claim 4 (depends on 1)

A composition according to claim 1 wherein said crosslinking agent is ethylene glycol dimethacrylate.