Patent US4497912A successfully refreshed from Google Patents.
US4497912A
Expired / Lapsed
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Fine particulate, expandable styrene polymers suitable for the production of rapidly mold-ejected cellular bodies
Assignee: Huels AG
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Filing: 1984-06-18
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Granted: 1985-02-05
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Expires: 2004-06-18
Abstract
Abstract Fine particulate expandable styrene polymers suitable for the production of molded bodies with improved minimum mold dwell times, containing 0.01 to 2.0% by weight, referred to the polystyrene or the total of the polymerized monomers, of polyoctenamer having I values from about 10 to 400 ml/g and trans octylene contents from about 20 to 90%.
Inventors
- 👤 Dirk Reese
- 👤 Josef K. Rigler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:45
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0061; C08F; C08F283/00; C08F283/04; C08J9/16; C08J9/20; C08J2325/00; C08J2325/02; C08J2465/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
83 words
In the method for producing particulate molding compositions for the production of foamed articles by polymerizing styrene monomer in aqueous suspension under intensive mechanical stirring in the presence of an expanding agent and in the presence of water-insoluble high molecular weight compound which is oluble in the styrene monomer and forms a discontinuous phase with the polymer produced, the improvement comprising as said high molecular weight compound a polyoctenamer having a concentration of 0.01 to 2.0 percent by weight based on the styrene.
Claim 2
Dependent Claim
83 words
In the method for producing particulate molding compositions for the production of foamed articles by polymerizing styrene monomer in aqueous suspension under intensive mechanical stirring in the presence of an expanding agent and in the presence of water-insoluble high molecular weight compound which is oluble in the styrene monomer and forms a discontinuous phase with the polymer produced, the improvement comprising as said high molecular weight compound a polyoctenamer having a concentration of 0.01 to 2.0 percent by weight based on the styrene.
Claim 3
Dependent Claim
29 words
The method of claim 1, wherein said polyoctenamer has a solution viscosity of about 10 to 400 ml/g (I value) and a trans octylene content of 20 to 90%.
Claim 4
Dependent Claim
17 words
The method of claim 2, wherein said polyoctenamer has a trans octylene content from 40 to 80%.
Claim 5
Dependent Claim
15 words
The method of claim 3, wherein said polyoctenamer concentration is 0.01 to 0.5% by weight.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-02-05 | 1988-08-06 | 1989-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-02-05 | 1992-08-06 | 1993-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-02-05 | 1996-08-06 | 1997-02-05 | $7700.00 | Window Closed / Lapsed |