Claims
- 1. A method of making an acrylic product having a textured surface, comprising the steps of:
- (a) mixing (i) a syrup comprising about 80 to about 95 percent by weight of methylmethacrylate and about 5 to about 20 percent by weight of polymethylmethacrylate and (ii) about 5 to about 25 percent based on the weight of said syrup of polymethylmethacrylate particles, said polymethylmethacrylate particles comprising up to 1 percent by weight of a crosslinking agent and about 10 to about 30 percent by weight of uncrosslinked polymethylmethacrylate;
- (b) permitting said particles to absorb methylmethacrylate whereby said particles swell to about 200 percent or more of their original volume; and
- (c) curing said syrup containing said particles, whereby said resulting acrylic product is thermoformable.
- 2. The method of claim 1 further comprising the step of adding an inert inorganic filler to said syrup before curing.
- 3. The method of claim 2 wherein said inorganic filler is alumina trihydrate.
- 4. The method of claim 3 wherein said alumina trihydrate is present in an amount of about 10 to about 55 percent by weight of the finished product.
- 5. The method of claim 1 wherein the polymethylmethacrylate in said particles which is not crosslinked is about 20 to about 25 percent by weight of said polymethylmethacrylate.
- 6. The method of claim 1 wherein said particles are of a size such that no more than about 1% are retained on a sieve having openings of 0.5 mm.
- 7. The method of claim 1 wherein the polymethylmethacrylate of said syrup has a weight average molecular weight of about 150,000 to about 600,000.
- 8. The method of claim 1 wherein said syrup further comprises butyl acrylate.
Parent Case Info
This is a division of application Ser. No. 098,564 filed Jul. 26, 1993, now U.S. Pat. No. 5,415,931, which is a continuation of application Ser. No. 948,272, filed Sep. 16, 1992, now abandoned, which is a division of our patent application Ser. No. 572,831, filed Aug. 27, 1990, now U.S. Pat. No. 5,242,968.
US Referenced Citations (13)
Divisions (2)
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Number |
Date |
Country |
Parent |
98564 |
Jul 1993 |
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Parent |
572831 |
Aug 1990 |
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Continuations (1)
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Number |
Date |
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948272 |
Sep 1992 |
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