Patent US4230548A successfully refreshed from Google Patents.
US4230548A
Expired / Lapsed
US
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Polycarbonates with end groups containing bonds which can be crosslinked by UV light
Assignee: Bayer AG
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Filing: 1979-04-30
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Granted: 1980-10-28
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Expires: 1999-04-30
Abstract
Abstract The present invention relates to high-molecular weight aromatic polycarbonates, based on diphenols and monofunctional chain stoppers, corresponding to the formula (I) ##STR1## in which Z denotes the radical of a diphenol, n denotes an integer from about 20 to 400, E denotes ##STR2## wherein m denotes 0 or 1 and R denotes H or C 1 -C 3 -alkyl. The present invention also relates to a process for the preparation of the polycarbonates of the formula (I) comprising reacting diphenols of the formula (II) HO--Z--OH (II) wherein Z is a divalent aromatic radical, and/or their chlorocarbonic acid esters in accordance with the processes which are known for the preparation of polycarbonates, in a homogeneous or heterogeneous phase system, with compounds of the formula (III) ##STR3## wherein m denotes 0 or 1 and R denotes H or C 1 -C 3 -alkyl. The present invention also relates to a process for cross-linking the polycarbonates of the formula (I) with UV light, after adding a photoinitiator and, optionally, flameproofing and photo-reducing agents. Finally, the present invention relates to the cross-linked polycarbonates obtained via this process.
Inventors
- 👤 Siegfried Adelmann
- 👤 Dieter Margotte
- 👤 Hugo Vernaleken
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:31
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/64; C08G64/00; C08G64/04; C08G64/06; C08G64/14; C08K; C08K5/00; C08K5/04; C08K5/07; C08K5/36; C08K5/41; C08K5/42
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
71 words
High-molecular weight aromatic polycarbonates having molecular weights M w (weight-average) between about 10,000 and 200,000 which are based on diphenols and monofunctional chain stoppers, characterized in that they correspond to the formula (I) ##STR7## in which Z denotes the radical of a diphenol, n denotes an integer from about 20 to 400, E denotes ##STR8## wherein m denotes 0 or 1 and R denotes H or C 1 -C 3 -alkyl.
Claim 2
Dependent Claim
71 words
High-molecular weight aromatic polycarbonates having molecular weights M w (weight-average) between about 10,000 and 200,000 which are based on diphenols and monofunctional chain stoppers, characterized in that they correspond to the formula (I) ##STR7## in which Z denotes the radical of a diphenol, n denotes an integer from about 20 to 400, E denotes ##STR8## wherein m denotes 0 or 1 and R denotes H or C 1 -C 3 -alkyl.
Claim 3
Dependent Claim
78 words
A process for the preparation of the polycarbonates of claim 1, characterized in that diphenols of the formula (II) HO--Z--OH (II) wherein Z is a divalent aromatic radical, and/or their chlorocarbonic acid esters are reacted in accordance with the processes which are known for the preparation of polycarbonates, in a homogeneous or heterogeneous phase system, with compounds of the formula (III) ##STR9## wherein m denotes 0 or 1 and R denotes H or C 1 -C 3 -alkyl.
Claim 4
Dependent Claim
37 words
A process for the modification of the polycarbonates of claim 1, wherein the polycarbonate is irradiated with UV light, after adding between about 0.05 and 5%, by weight, relative to the weight of polycarbonate, of a photoinitiator.
Claim 5
Dependent Claim
25 words
The process according to claim 3, wherein between about 1 and 3% by weight, relative to the weight of polycarbonate, of a photoinitiator is employed.
Claim 6
Dependent Claim
26 words
The process of claim 3, wherein the photoinitiator is added via solution and the polycarbonate is isolated as a film prior to irradiating with UV light.
Claim 7
Dependent Claim
24 words
The process of claim 3, wherein the photoinitiator is added via compounding between about 280° and 330° C. prior to irradiating with UV light.
Claim 8
Dependent Claim
32 words
The process according to claim 3, wherein between about 0.05 and 5% by weight, based on the weight of polycarbonate, of a photo-reducing agent is added to the polycarbonate prior to irradiation.
Claim 9
Dependent Claim
27 words
The process of claim 7, wherein the photo-reducing agent is added via solution and the polycarbonate is isolated as a film prior to irradiating with UV light.
Claim 10
Dependent Claim
25 words
The process of claim 7, wherein the photo-reducing agent is added via compounding between about 280° and 330° C. prior to irradiating with UV light.
Claim 11
Dependent Claim
14 words
The process of claim 7, wherein the photo-reducing agent is introduced in vapor form.
Claim 12
Dependent Claim
35 words
The process according to either claim 3 or 7, wherein between about 0.05 and 5% by weight, relative to the weight of polycarbonate, of a flameproofing agent is added to the polycarbonate prior to irradiation.
Claim 13
Dependent Claim
25 words
The process of claim 11, wherein between about 0.1 to 2% by weight, relative to the weight of polycarbonate, of a flameproofing agent is employed.
Claim 14
Dependent Claim
27 words
The process of claim 11, wherein the flameproofing agent is added via solution and the polycarbonate is isolated as a film prior to irradiating with UV light.
Claim 15
Dependent Claim
25 words
The process of claim 11, wherein the flameproofing agent is added via compounding between about 280° and 330° C. prior to irradiating with UV light.
Claim 16
Dependent Claim
71 words
A process for cross-linking the polycarbonates of claim 1, wherein the polycarbonate is dipped into a solvent mixture containing (a) between about 0.05 and 5% by weight, relative to the weight of polycarbonate, of a photoinitiator, and (b) optionally, between 0.05 and 5% by weight, based on the weight of polycarbonate, of a photo-reducing agent, characterized in that the solvents are inert toward said polycarbonate and then irradiated with UV light.
Claim 17
Dependent Claim
22 words
The process of claim 3 wherein the polycarbonate is sprayed with a solvent mixture containing the photoinitiator and optionally a photo-reducing agent.
Claim 18
Dependent Claim
12 words
Crosslinked polycarbonates produced by the process of either claim 3 or 7.
Claim 19
Dependent Claim
24 words
The crosslinked polycarbonates of claim 17 containing between about 0.05 and 5% by weight, relative to the weight of polycarbonate, of a flameproofing agent.
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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) | 1983-10-28 | 1984-04-28 | 1984-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-10-28 | 1988-04-28 | 1988-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-10-28 | 1992-04-28 | 1992-10-28 | $7700.00 | Window Closed / Lapsed |