Patent US4746711A successfully refreshed from Google Patents.
US4746711A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mixtures of aromatic polycarbonates and aromatic polyester-carbonates, and their use for the production of mouldings, films, fibres, filaments and coatings
Assignee: Bayer AG
•
Filing: 1986-10-14
•
Granted: 1988-05-24
•
Expires: 2006-10-14
Abstract
Abstract Mixtures of aromatic polycarbonates and aromatic polyester-carbonates having a specific polycarbonate/polyester-carbonate ratio and a defined ester content in the polyester-carbonates, at least one of the polycondensates containing C 8 -C 9 -alkylated phenyl end groups, possess a reduced tendency to stress cracking.
Inventors
- 👤 Volker Serini
- 👤 Dieter Freitag
- 👤 Dietrich Rathmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 02:08
CPC Classifications
C; C08; C08L; C08L69/00; C08L69/005
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
151 words
Mixtures consisting of: I. an aromatic polycarbonate and II. an aromatic polyester-carbonate, characterized in that: (a) the mixture contains 5 to 70% by weight of I and 95 to 30% by weight of II, the percentages of I and II relating to the sum of I+II, (b) the ester group content of the polyester-carbonate II is 60 to 95 mol%, relative to the sum of ester and carbonate groups in II, and (c) at least one of the components I and II contains end groups of the formula ##STR5## wherein --X-- represents --O-- or --CO-- and R represents a branched alkyl radical having 8 to 9 C atoms, subject to the proviso that the proportion of methyl hydrogen atoms in the alkyl radical R is 47 to 89%, relative to the total of the hydrogen atoms in the alkyl radical, and that R is in the o-position or in the p-position.
Claim 2
Dependent Claim
151 words
Mixtures consisting of: I. an aromatic polycarbonate and II. an aromatic polyester-carbonate, characterized in that: (a) the mixture contains 5 to 70% by weight of I and 95 to 30% by weight of II, the percentages of I and II relating to the sum of I+II, (b) the ester group content of the polyester-carbonate II is 60 to 95 mol%, relative to the sum of ester and carbonate groups in II, and (c) at least one of the components I and II contains end groups of the formula ##STR5## wherein --X-- represents --O-- or --CO-- and R represents a branched alkyl radical having 8 to 9 C atoms, subject to the proviso that the proportion of methyl hydrogen atoms in the alkyl radical R is 47 to 89%, relative to the total of the hydrogen atoms in the alkyl radical, and that R is in the o-position or in the p-position.
Claim 3
Dependent Claim
25 words
Mixtures according to claim 1, characterized in that they contain 10 to 65% by weight of I and 90 to 35% by weight of II.
Claim 4
Dependent Claim
25 words
Mixtures according to claim 1, characterized in that they contain 15 to 60% by weight of I and 85 to 40% by weight of II.
Claim 5
Dependent Claim
21 words
Mixtures according to claim 1, characterized in that the ester group content of the polyester-carbonate II is 60 to 85 mol%.
Claim 6
Dependent Claim
21 words
Mixtures according to claim 1, characterized in that the ester group content of the polyester-carbonate II is 70 to 80 mol%.
Claim 7
Dependent Claim
27 words
Mixtures according to claim 1, characterized in that the components I and II contain at least 70 mol% of bisphenol A radicals, relative to incorporated diphenol radicals.
Claim 8
Dependent Claim
29 words
Mixtures according to claim 1, characterized in that at least one of the components I and II contains 100 mol% of bisphenol A radicals, relative to incorporated diphenol radicals.
Claim 9
Dependent Claim
23 words
Mixtures according to claim 1, characterized in that the end groups of the formula I are selected from the groups consisting of ##STR6##
Claim 10
Dependent Claim
14 words
Moldings, films, fibers, filaments or coatings prepared from the mixture 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) | 1991-05-24 | 1991-11-23 | 1992-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-05-24 | 1995-11-23 | 1996-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-05-24 | 1999-11-23 | 2000-05-24 | $7700.00 | Window Closed / Lapsed |