Patent US4973196A successfully refreshed from Google Patents.
Patent US4041003A successfully refreshed from Google Patents.
US4041003A
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Process for molding aromatic polycarbonates having perfluoroalkanesulphonic acid derivatives as mold release agents
Assignee: Bayer AG
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Filing: 1976-02-09
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Granted: 1977-08-09
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Expires: 1996-02-09
Abstract
Abstract The present invention is concerned with a process for molding thermoplastic, high molecular weight aromatic polycarbonates the improvement which comprises adding to the aromatic polycarbonate from about 0.001 to 1% by weight of a mold release agent selected from the group consisting of perfluoroalkanesulphonic acid amides, cyclimmonium salts of perfluoroalkanesulphonic acids and ammonium salts of perfluoroalkanesulphonic acids.
Inventors
- 👤 Siegfried Adelmann
- 👤 Dieter Margotte
- 👤 Hugo Vernaleken
- 👤 Hans Niederprum
- 👤 Johann Nikolaus Meussdoerffer
- 👤 Werner Nouvertne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:47
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/36; C08K5/41; C08K5/42; C08K5/43
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
47 words
In a process for molding thermoplastic, high molecular weight, aromatic polycarbonates, the improvement which comprises adding to the aromatic polycarbonate from about 0.001 to 1% by weight of a mold release agent selected from the group consisting of perfluoro-alkanesulphonic acid amides and cyclimmonium salts of perfluoro-alkanesulphonic acids.
Claim 2
Dependent Claim
47 words
In a process for molding thermoplastic, high molecular weight, aromatic polycarbonates, the improvement which comprises adding to the aromatic polycarbonate from about 0.001 to 1% by weight of a mold release agent selected from the group consisting of perfluoro-alkanesulphonic acid amides and cyclimmonium salts of perfluoro-alkanesulphonic acids.
Claim 3
Dependent Claim
18 words
The process of claim 1 wherein the aromatic polycarbonate has a molecular weight from about 10,000 to 200,000.
Claim 4
Dependent Claim
20 words
The process of claim 1 wherein from about 0.001 to 0.01% by weight of the mold release agent are added.
Claim 5
Dependent Claim
107 words
The process of claim 1 wherein the mold release agent consists of perfluoroalkanesulphonic acid amides of the general formula IIa: R.sub.F -- SO.sub.2 -- X IIa wherein R f is a linear or branched aliphatic perfluoroalkyl radical with 1 to 12 C atoms or a cyclic aliphatic perfluoroalkyl radical with 3-12 C atoms and X is NR 1 R 2 , wherein R 1 and R 2 are identical or different and can be hydrogen, C 1 -C 18 alkyl, C 7 -C 20 aralkyl and C 5 -C 20 cycloalkyl, and furthermore R 1 and R 2 can form a heterocyclic structure with the N atom.
Claim 6
Dependent Claim
93 words
The process of claim 1 wherein the mold release agent consists of cyclimmonium salts of perfluoroalkanesulphonic acids of the general formula IIc: R.sub.F -- SO.sub.2 -- X wherein R f is a linear or branched aliphatic perfluoroalkyl radical with 1 to 12 C atoms or a cyclic aliphatic perfluoroalkyl radical with 3-12 C atoms and X is ##STR4## wherein R 1 can be C 1 -C 18 alkyl, C 7 -C 20 aralkyl or C 5 -C 20 cycloalkyl and N = q is an aromatic heterocyclic compound containing 1 hetero nitrogen atom.
Claim 7
Dependent Claim
63 words
The process of claim 1 wherein said aromatic polycarbonate is derived from an aromatic dihydroxydiaryl compound of the general formula: ##STR5## wherein R are identical or different and are H, C 1 -C 4 alkyl, Cl or Br and X 1 is C 1 -C 8 alkylene, C 2 -C 8 alkylidene, C 5 -C 15 cycloalkylene and C 5 -C 15 cycloalkylidene.
Claim 8
Dependent Claim
23 words
The process of claim 6 wherein said aromatic dihydroxydiaryl compound is selected from the group consisting of 2,2-bis-(4-hydroxyphenyl)-propane, 2,2-bis-(3,5-dimethyl-4-hydroxyphenyl)-propane, 2,2-bis-(3,5-dichloro-4-hydroxyphenyl)-propane, 2,2-bis-(3,5-dibromo-4-hydroxyphenyl)-propane and 1,1-bis-(4-hydroxyphenyl)-cyclohexane.
Claim 9
Dependent Claim
20 words
The process of claim 1 wherein a glass fiber is added to the aromatic polycarbonate and the mold release agent.
References Cited (Backward Citations)
US3775367A
Cited
US3836499A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-08-08 | 1981-02-07 | 1981-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-08 | 1985-02-07 | 1985-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-08 | 1989-02-07 | 1989-08-09 | $7700.00 | Window Closed / Lapsed |