US4096224A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Molded styrene polymer articles from vacuum-formed or thermoformed S-B-S block copolymer sheets
Assignee: Huels AG
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Filing: 1976-05-05
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Granted: 1978-06-20
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Expires: 1996-05-05
Abstract
Abstract Sheets produced by the extrusion of a mixture of about 85 - 95 percent by weight of polystyrene or semi-impact-resistant polystyrene and about 5 - 15 percent by weight of a diene-styrene block copolymer having the structure S-B-S wherein S represents the styrene structure and B represents the butadiene or isoprene structure are used for the manufacture of molded articles in the vacuum-forming or thermoforming method.
Inventors
- 👤 Gunter Simon
- 👤 Walter Widmaier
- 👤 Karl-Ulrich Reichert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 01:46
CPC Classifications
B; B29; B29C; B29C51/00; B29C51/002; C; C08; C08L; C08L25/00; C08L25/02; C08L25/04; C08L25/06; C08L53/00; C08L53/02
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
98 words
In the method of manufacturing molded articles comprising thermoforming extruded polystyrene sheets, the improvement comprising the use of sheets having a thickness of about 0.2 to 2.0 mm produced by extruding a mixture of about 85-95 percent by weight of polystyrene and about 5-15 percent by weight of a diene-styrene block copolymer having the structure S-B-S wherein S represents styrene and B represents butadiene or isoprene said block copolymer having a molecular weight of about 60,000 to 130,000; an RSV value in toluene of between 0.80 and 1.30 and a diene content of between 50 and 85 percent.
Claim 2
Dependent Claim
98 words
In the method of manufacturing molded articles comprising thermoforming extruded polystyrene sheets, the improvement comprising the use of sheets having a thickness of about 0.2 to 2.0 mm produced by extruding a mixture of about 85-95 percent by weight of polystyrene and about 5-15 percent by weight of a diene-styrene block copolymer having the structure S-B-S wherein S represents styrene and B represents butadiene or isoprene said block copolymer having a molecular weight of about 60,000 to 130,000; an RSV value in toluene of between 0.80 and 1.30 and a diene content of between 50 and 85 percent.
Claim 3
Dependent Claim
13 words
The method of claim 1, wherein said polystyrene is a homopolymer of styrene.
Claim 4
Dependent Claim
20 words
The method of claim 1, wherein said diene-styrene block copolymer has a diene proportion of about 55-80 percent by weight.
Claim 5
Dependent Claim
20 words
The method of claim 2, wherein said diene-styrene block copolymer has a diene proportion of about 55-80 percent by weight.
Claim 6
Dependent Claim
13 words
The method of claim 1, wherein said RSV value is 1.0 to 1.30.
Claim 7
Dependent Claim
13 words
The method of claim 1, wherein said RSV value is 1.15 to 1.30.
Claim 8
Dependent Claim
15 words
The method of claim 1, wherein said weight of diene-styrene block copolymer is 8-15 percent.
Claim 9
Dependent Claim
17 words
The method of claim 1, wherein said sheets have a thickness of about 0.5 to 1.0 mm.
Claim 10
Dependent Claim
19 words
The method of claim 2, wherein said homopolymer of styrene has a K value of about 55 to 70.
Claim 11
Dependent Claim
19 words
The method of claim 2, wherein said homopolymer of styrene has a K value of about 60 to 68.
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) | 1981-06-19 | 1981-12-19 | 1982-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-19 | 1985-12-19 | 1986-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-19 | 1989-12-19 | 1990-06-20 | $7700.00 | Window Closed / Lapsed |