Patent US4131575A successfully refreshed from Google Patents.
US4131575A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermoplastic polycarbonate molding materials with improved mold release
Assignee: Bayer AG
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Filing: 1977-02-17
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Granted: 1978-12-26
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Expires: 1997-02-17
Abstract
Abstract The present invention is concerned with thermoplastic molding materials of high molecular weight, thermoplastic, aromatic polycarbonates based on aromatic dihydroxy compounds and containing from about 0.01 to 0.1% by weight of esters of saturated aliphatic carboxylic acids with 10 to 20 C atoms and 4-hydric to 6-hydric alcohols.
Inventors
- 👤 Siegfried Adelmann
- 👤 Dieter Margotte
- 👤 Hugo Vernaleken
- 👤 Werner Nouvertne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:35
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/10; C08K5/101; C08K5/103
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
43 words
Thermoplastic molding materials comprising high molecular weight, thermoplastic, aromatic polycarbonates based on aromatic dihydroxy compounds and containing from about 0.01 to 0.1% by weight of esters of saturated aliphatic carboxylic acids with 10 to 20 C atoms and aliphatic 4-hydric to 6-hydric alcohols.
Claim 2
Dependent Claim
43 words
Thermoplastic molding materials comprising high molecular weight, thermoplastic, aromatic polycarbonates based on aromatic dihydroxy compounds and containing from about 0.01 to 0.1% by weight of esters of saturated aliphatic carboxylic acids with 10 to 20 C atoms and aliphatic 4-hydric to 6-hydric alcohols.
Claim 3
Dependent Claim
16 words
Thermoplastic molding materials according to claim 1 containing from about 0.05 to 0.1% of the esters.
Claim 4
Dependent Claim
44 words
Thermoplastic molding materials according to claim 1 wherein the esters are of 4 hydric alcohols having between 4 and 16 carbon atoms or of 5-hydric alcohols having between 5 and 18 carbon atoms or of 6-hydric alcohols having between 6 and 18 carbon atoms.
Claim 5
Dependent Claim
68 words
Thermoplastic molding materials according to claim 1 wherein the aromatic dihydroxy compounds are those of the general formula (I) ##STR3## wherein R is identical or different and denotes H, C 1 -C 4 -alkyl, Cl or Br and wherein X is a bond, C 1 -C 8 -alkylene, C 2 -C 8 -alkylidene, C 5 -C 15 -cycloalkylene, C 5 -C 15 -cycloalkylidene, --SO 2 -- or ##STR4##
Claim 6
Dependent Claim
31 words
Thermoplastic molding compositions according to claim 1 wherein the aromatic polycarbonates include from about 0.05 to 2 mol % by weight, based on the aromatic dihydroxy compounds employed, of polyhydroxy compounds.
Claim 7
Dependent Claim
20 words
Thermoplastic molding compositions according to claim 1 wherein the molecular weights of the polycarbonates are from about 20,000 to 80,000.
Claim 8
Dependent Claim
21 words
Thermoplastic molding compositions according to claim 1 wherein the saturated aliphatic carboxylic acids are myristic acid, palmitic acid and stearic acid.
Claim 9
Dependent Claim
16 words
Thermoplastic molding compositions according to claim 1 containing dyestuffs, pigments, stabilizers, flame proofing agents or fillers.
Claim 10
Dependent Claim
10 words
Articles molded from the thermoplastic molding compositions of claim 1.
Claim 11
Dependent Claim
30 words
Thermoplastic molding materials according to claim 1, wherein the esters are partial esters of saturated aliphatic carboxylic acids with 10 to 20 C atoms and aliphatic 4-hydric to 6-hydric alcohols.
Claim 12
Dependent Claim
19 words
Thermoplastic molding materials according to claim 10 containing from about 0.05 to 0.1% by weight of said partial esters.
Claim 13
Dependent Claim
18 words
Thermoplastic molding materials according to claim 10 wherein said partial esters contain not more than 2 unesterified OH-groups.
Claim 14
Dependent Claim
17 words
Thermoplastic molding materials according to claim12 wherein said partial esters contain not more than one unesterified OH-group.
Claim 15
Dependent Claim
24 words
Thermoplastic molding materials according to claim 10 wherein said partial esters have an average number molecular weight (M n ) of less than 5000.
References Cited (Backward Citations)
GB943280A
Cited
US3533994A
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US3516957A
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US3784595A
Cited
US3836499A
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US4065436A
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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) | 1981-12-25 | 1982-06-26 | 1982-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-12-25 | 1986-06-26 | 1986-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-12-25 | 1990-06-26 | 1990-12-26 | $7700.00 | Window Closed / Lapsed |