Patent US4064195A successfully refreshed from Google Patents.
US4064195A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Modified aromatic polycarbonates
Assignee: Bayer Corp
•
Filing: 1976-06-09
•
Granted: 1977-12-20
•
Expires: 1996-06-09
Abstract
Abstract Aromatic polycarbonate resin mixtures consisting essentially of an aromatic carbonate having the repetitive carbonate group <IMAGE> and in addition always the <IMAGE> RADICAL ATTACHED TO A CARBONATE GROUP AND A MODIFYING MINOR AMOUNT OF A POLYCAPROLACTONE POLYMER HAVING THE FORMULA <IMAGE> WHERE N IS GREATER THAN 100 AND LESS THAN 3000, EXHIBIT, AS COMPARED TO THOSE OF AROMATIC POLYCARBONATES ALONE, E.G. IMPROVED MELT STABILITY. The modified polycarbonates are produced by intimately premixing the polycarbonate with minor selected amounts of polycaprolactone.
Inventors
- 👤 Arthur L. Baron
- 👤 Parameswar Sivaramakrishnan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:36
CPC Classifications
C; C08; C08L; C08L69/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
55 words
Resin mixtures consisting essentially of high molecular weight, thermoplastic polycarbonate based on dihydric phenols, and between about 0.1 and about 0.95 weight percent, referred to the total weight of polycarbonate and polycaprolactone of a polycaprolactone polymer having the repeating units given by the formula ##STR6## wherein n is greater than 100 and less than 3000.
Claim 2
Dependent Claim
55 words
Resin mixtures consisting essentially of high molecular weight, thermoplastic polycarbonate based on dihydric phenols, and between about 0.1 and about 0.95 weight percent, referred to the total weight of polycarbonate and polycaprolactone of a polycaprolactone polymer having the repeating units given by the formula ##STR6## wherein n is greater than 100 and less than 3000.
Claim 3
Dependent Claim
26 words
Resin mixtures according to claim 1, having between 0.25 and 0.75 weight percent, referred to the total weight of polycarbonate and polycaprolactone, of the polycaprolactone polymer.
Claim 4
Dependent Claim
21 words
Resin mixtures according to claims 1 and 2 wherein the polycaprolactone polymer has a reduced viscosity of between 0.1 and 1.5
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) | 1980-12-19 | 1981-06-20 | 1981-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-12-19 | 1985-06-20 | 1985-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-12-19 | 1989-06-20 | 1989-12-20 | $7700.00 | Window Closed / Lapsed |