Patent US4065436A successfully refreshed from Google Patents.
US4065436A
Expired / Lapsed
US
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Thermoplastic polycarbonate moulding compositions with improved ease of mould release
Assignee: Bayer AG
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Filing: 1976-07-30
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Granted: 1977-12-27
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Expires: 1996-07-30
Abstract
Abstract The invention relates to a thermoplastic moulding composition comprising a thermoplastic aromatic polycarbonate based on an aromatic dihydroxy compound and containing 0.01 to 0.5% by weight of an ester of a saturated aliphatic carboxylic acid with 10 to 20 C atoms per molecule and an aromatic hydroxy compound with from 1 to 6 hydroxyl groups.
Inventors
- 👤 Siegfried Adelmann
- 👤 Dieter Margotte
- 👤 Hugo Vernaleken
- 👤 Werner Nouvertne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:13
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/10; C08K5/101; C08K5/105; H; H05; H05K; H05K3/00; H05K3/22; H05K3/28; H05K3/285; H05K3/288
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
63 words
A thermoplastic moulding composition comprising a thermoplastic aromatic polycarbonate based on an aromatic dihydroxy compound having a mean weight-average molecular weight, M w , of at least 10,000 and containing 0.01 to 0.5% by weight of an ester of a saturated aliphatic carboxylic acid with 10 to 20 C atoms per molecule and an aromatic hydroxy compound with 1 to 6 hydroxyl groups.
Claim 2
Dependent Claim
63 words
A thermoplastic moulding composition comprising a thermoplastic aromatic polycarbonate based on an aromatic dihydroxy compound having a mean weight-average molecular weight, M w , of at least 10,000 and containing 0.01 to 0.5% by weight of an ester of a saturated aliphatic carboxylic acid with 10 to 20 C atoms per molecule and an aromatic hydroxy compound with 1 to 6 hydroxyl groups.
Claim 3
Dependent Claim
17 words
A composition according to claim 1 containing from 0.05 to 0.1% by weight of the said ester.
Claim 4
Dependent Claim
21 words
A composition according to claim 1 in which the said polycarbonate has a weight-average molecular weight of from 10,000 to 200,000.
Claim 5
Dependent Claim
70 words
A composition according to claim 1 wherein the aromatic polycarbonate is derived from a bisphenol of the formula (I): ##STR3## in which R is identical or different and denotes H, C 1 -C 4 -alkyl, Cl or Br and in which 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
40 words
A composition according to claim 1 wherein the said ester is an ester of phenol, pyrocatechol, resorcinol, hydroquinone, phloroglucinol, pyrogallol, hydroxyhydroquinone, hexahydroxybenzene, 2,2-bis-(4-hydroxyphenyl)-propane (bisphenol A), 2,2-bis-(3,5-dimethyl-4-hydroxyphenyl)-propane (tetramethylbisphenol A), 2,2-bis-(3,5-dichloro-4-hydroxyphenyl)-propane (tetrachlorobisphenol A), 2,2-bis-(3,5-dibromo-4-hydroxyphenyl)-propane (tetrabromobisphenol A), 4,4'-dihydroxy-tetraphenylmethane, 1,4-bis-(4',4"-dihydroxytriphenyl)-methyl)benzene, naphthol, anthrahydroquinone or dihydroxynaphthalene.
Claim 7
Dependent Claim
37 words
A composition according to claim 1 wherein the said ester is an ester of capric acid, undecanoic acid, lauric acid, tridecanoic acid, myristic acid, pentadecanoic acid, palmitic acid, margaric acid, stearic acid, monodecanoic acid or eicosanoic acid.
Claim 8
Dependent Claim
11 words
A moulded article formed from a composition according to claim 1.
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) | 1980-12-26 | 1981-06-27 | 1981-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-12-26 | 1985-06-27 | 1985-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-12-26 | 1989-06-27 | 1989-12-27 | $7700.00 | Window Closed / Lapsed |