Patent US4681719A successfully refreshed from Google Patents.
US4681719A
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US
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Production of compression moldings from finely divided thermoplastic polymers
Assignee: BASF SE
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Filing: 1985-06-10
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Granted: 1987-07-21
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Expires: 2005-06-10
Abstract
Abstract Compression moldings are produced from finely divided thermoplastic polymers by a method in which the polymer particles are mixed with an effective amount of amorphous silica before being subjected to compression molding. Compression moldings of this type are used for the preparation of finishes, paints and lubricating oils, depending on the type of the polymers.
Inventors
- 👤 Hans-Henning Vogel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:28
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/34; C08K3/36
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
74 words
A process for the production of a stable compression molded block of finely divided particles of a thermoplastic polymer, which process comprises: mixing the polymer particles with from 0.01 to 0.3% by weight, based on the amount of the polymer, of amorphous silica; and then subjecting the resulting mixture to compression molding at a temperature and pressure sufficient to form a stable comminutable block of polymer particles but insufficient to produce a polymer melt.
Claim 2
Dependent Claim
74 words
A process for the production of a stable compression molded block of finely divided particles of a thermoplastic polymer, which process comprises: mixing the polymer particles with from 0.01 to 0.3% by weight, based on the amount of the polymer, of amorphous silica; and then subjecting the resulting mixture to compression molding at a temperature and pressure sufficient to form a stable comminutable block of polymer particles but insufficient to produce a polymer melt.
Claim 3
Dependent Claim
38 words
A process as claimed in claim 1, which is applied to a polymer which consists essentially of a hydrogenated thermoplastic copolymer of styrene and at least one other monomer selected from the group consisting of butadiene and isoprene.
References Cited (Backward Citations)
US2855377A
Cited
US2849415A
Cited
US3012900A
Cited
US3413394A
Cited
US3400087A
Cited
US3600309A
Cited
US3585094A
Cited
US3663666A
Cited
US4187360A
Cited
US4183887A
Cited
US4302413A
Cited
GB2052357A
Cited
JPS5773024A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-07-20 | 1991-01-19 | 1991-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-07-20 | 1995-01-19 | 1995-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-07-20 | 1999-01-19 | 1999-07-21 | $7700.00 | Window Closed / Lapsed |