US4598123A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Impact modified methyl methacrylate polymer
Assignee: Aristech Acrylics LLC
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Filing: 1985-05-01
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Granted: 1986-07-01
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Expires: 2005-05-01
Abstract
Abstract A clear, cast acrylic sheet of improved impact strength may be prepared by dispersing or dissolving 8-14% of an ABA block copolymer, (where A is styrene, B is a hydrogenated butadiene, containing a large 1-2 butadiene fraction) in a methyl methacrylate casting mixture which contains 0.1- 20% styrene, and polymerizing in sheet form by heating with free-radical initiators.
Inventors
- 👤 Louis A. Cutter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:31
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/18; C08F; C08F287/00; C08J2333/00; C08J2333/04; C08J2333/06; C08J2333/10; C08J2333/12; Y; Y10; Y10S; Y10S525/00; Y10S525/901
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
77 words
A casting syrup for making an impact-modified polymethylmethacrylate comprising about 0.1% to about 20% styrene, about 69 to about 87% methyl methacrylate, about 0.2% to about 2.0% of a peroxide initiator, and about 8 to about 14% of an ABA block copolymer having a weight ratio of A:B monomer of about 1:2 to about 1:3 wherein A is a chain of polystyrene, and B is a block of hydrogenated polybutadiene, and up to about 10% ethylene-propylene rubber.
Claim 2
Dependent Claim
77 words
A casting syrup for making an impact-modified polymethylmethacrylate comprising about 0.1% to about 20% styrene, about 69 to about 87% methyl methacrylate, about 0.2% to about 2.0% of a peroxide initiator, and about 8 to about 14% of an ABA block copolymer having a weight ratio of A:B monomer of about 1:2 to about 1:3 wherein A is a chain of polystyrene, and B is a block of hydrogenated polybutadiene, and up to about 10% ethylene-propylene rubber.
Claim 3
Dependent Claim
24 words
The syrup of claim 1 where the weight-average molecular weight of the block copolymer is in the range of about 50,000 to about 90,000.
Claim 4
Dependent Claim
14 words
Syrup of claim 1 including up to about 3% of a diunsaturated cross-linking agent.
Claim 5
Dependent Claim
14 words
Syrup of claim 1 wherein the styrene content is about 4% to about 11%.
Claim 6
Dependent Claim
14 words
Syrup of claim 1 wherein the styrene content is about 5% to about 8%.
Claim 7
Dependent Claim
27 words
Method of making an impact-modified polymethylmethacrylate comprising casting the syrup of claim 1 under polymerizing conditions wherein the maximum exotherm is reached in 80 minutes or less.
Claim 8
Dependent Claim
25 words
An impact-modified polymethylmethacrylate made by casting the syrup of claim 1 under polymerizing conditions wherein the maximum exotherm is reached in 80 minutes or less.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-06-30 | 1989-12-30 | 1990-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-06-30 | 1993-12-30 | 1994-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-06-30 | 1997-12-30 | 1998-07-01 | $7700.00 | Window Closed / Lapsed |