Patent US5242968A successfully refreshed from Google Patents.
US5242968A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acrylic-filled thermoformable acrylic sheet
Assignee: ARISTECH SURFACES LLC
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Filing: 1990-08-27
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Granted: 1993-09-07
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Expires: 2010-08-27
Abstract
Abstract A monomer-rich acrylic syrup is cast including about 10% to about 20% ground acrylic particles. During curing, the particles absorb over half their weight in monomer, and a cured sheet is formed in which the matrix monomer and uncrosslinked polymer form a phase which extends through the particles, while the particles appear to be fused together. Including a crosslinker in the syrup further insures the interpenetration of the matrix phase into the swollen particles. A textured surface is formed, which is useful as an anti-slip surface in bathtubs and shower stalls, after thermoforming.
Inventors
- 👤 Ettore Minghetti
- 👤 John E. Eitel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:54
CPC Classifications
B; B29; B29C; B29C51/00; B29C51/002; B29C39/00; B29C39/02; B29C39/026; C; C08; C08F; C08F265/00; C08F265/04; C08F265/06; B29K; B29K2033/00; B29K2033/04; B29K2033/12; B29K2433/00; B29K2433/04; B29K2433/12; Y; Y10; Y10T; Y10T428/00; Y10T428/25; Y10T428/254; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2998; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31928; Y10T428/31935
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
50 words
An acrylic product comprising a matrix of polymethylmethacrylate having dispersed within it preformed particles of polymethylmethacrylate predominantly from about 0.1 mm to about 2.0 mm wherein about 70% to about 90% of the composition of said preformed particles comprises crosslinked polymethylmethacrylate, said matrix exhibiting a continuity interpenetrating said preformed particles.
Claim 2
Dependent Claim
50 words
An acrylic product comprising a matrix of polymethylmethacrylate having dispersed within it preformed particles of polymethylmethacrylate predominantly from about 0.1 mm to about 2.0 mm wherein about 70% to about 90% of the composition of said preformed particles comprises crosslinked polymethylmethacrylate, said matrix exhibiting a continuity interpenetrating said preformed particles.
Claim 3
Dependent Claim
25 words
Acrylic product of claim 1 which comprises, about 10% to about 55% by weight of alumina trihydrate, based on said product including said alumina trihydrate.
Claim 4
Dependent Claim
15 words
Acrylic product of claim 1 in the form of a sheet having a textured surface.
Claim 5
Dependent Claim
12 words
Acrylic sheet of claim 3 including up to 3% dye or pigment.
Claim 6
Dependent Claim
28 words
Article of claim 1 wherein said preformed particles, including the portions of matrix which interpenetrate said preformed particles, comprise at least about 10% by volume of said article.
References Cited (Backward Citations)
US4282140A
Cited
US4396476A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-09-06 | 1997-03-08 | 1997-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-09-06 | 2001-03-08 | 2001-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-09-06 | 2005-03-08 | 2005-09-07 | $7700.00 | Window Closed / Lapsed |