US4196276A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High-molecular weight, segmented, polycarbonate elastomers
Assignee: Bayer AG
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Filing: 1978-01-16
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Granted: 1980-04-01
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Expires: 1998-01-16
Abstract
Abstract High-molecular weight polycarbonate elastomers are produced by reacting polymer segments having an average molecular weight (Mn) of more than 600 and carboxyl groups with diphenols and phosgene according to the two-phase boundary polycondensation process at a pH value between about 9 and about 14 and a temperature between about 0° C. and 80° C. and, thereafter, either heat-treating the resulting reaction products at temperatures between about 40° C. and about 100° C. or gelling the resulting reaction products in solution in organic solvents.
Inventors
- 👤 Manfred Schreckenberg
- 👤 Klaus Konig
- 👤 Dieter Freitag
- 👤 Volker Serini
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:00
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/64
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
91 words
A process for the preparation of a high-molecular weight polycarbonate elastomer containing incorporated polymer segments, which segments contain carboxyl groups, comprising reacting a carboxyl group-containing polymer having an average molecular weight (Mn) of more than about 600 with a diphenol and phosgene in accordance with a two-phase boundary polycondensation process at a pH of from about 9 to about 14 and a temperature of from about 0° C. to about 80° C., characterized in that the carboxyl group-containing polymer is a C--C linked polymer containing from 1 to 5 COOH groups.
Claim 2
Dependent Claim
91 words
A process for the preparation of a high-molecular weight polycarbonate elastomer containing incorporated polymer segments, which segments contain carboxyl groups, comprising reacting a carboxyl group-containing polymer having an average molecular weight (Mn) of more than about 600 with a diphenol and phosgene in accordance with a two-phase boundary polycondensation process at a pH of from about 9 to about 14 and a temperature of from about 0° C. to about 80° C., characterized in that the carboxyl group-containing polymer is a C--C linked polymer containing from 1 to 5 COOH groups.
Claim 3
Dependent Claim
16 words
The process according to claim 1, wherein the average molecular weight (Mn) is more than 800.
Claim 4
Dependent Claim
17 words
The process according to claim 2, wherein the average molecular weight (Mn) is from 1,000 to 20,000.
Claim 5
Dependent Claim
18 words
The process according to claim 1, wherein the temperature is from about 15° C. to about 40° C.
Claim 6
Dependent Claim
47 words
The process according to claim 1, wherein the reaction product of the process is subsequently either heat treated at a temperature of from about 40° C. to about 100° C. for from about 5 minutes to about 24 hours, or gelled in solution in an organic solvent.
Claim 7
Dependent Claim
17 words
The process according to claim 1, wherein the carboxyl group-containing polymer contains 2 or 3 COOH groups.
Claim 8
Dependent Claim
37 words
The process according to claim 1, wherein from about 0.05 to about 2.0 mol %, based on the weight of diphenol, of a compound containing at least three phenolic hydroxy groups is included in the reaction mixture.
Claim 9
Dependent Claim
18 words
The process according to claim 1, wherein the polycondensation occurs in the presence of a water-immiscible chlorohydrocarbon solvent.
Claim 10
Dependent Claim
18 words
The process according to claim 1, wherein the molar ratio of carboxyl group-containing polymer to phosgene is 1:3.
Claim 11
Dependent Claim
16 words
The process according to claim 1, wherein the molar ratio of bisphenol to phosgene is 1:1.5.
Claim 12
Dependent Claim
21 words
The process according to claim 1, wherein the proportion of polycarbonate in the elastomer is from 30 to 95% by weight.
Claim 13
Dependent Claim
54 words
The process according to claim 1, wherein the elastomer constituent is in an amorphous form and has a transformation temperature, determined by differential themoanalysis, of between about -100° C. and about +100° C., and the polycarbonate constituent is present in a partially crystalline form with a crystalline melting point of at least 160° C.
Claim 14
Dependent Claim
51 words
The process according to claim 1, wherein the elastomer has an average molecular weight Mw of from about 15,000 to about 200,000 and a relative solution viscosity η rel (measured on 0.5 g in 100 ml of CH 2 Cl 2 at 25° C.) of from about 1.2 to about 2.8.
Claim 15
Dependent Claim
30 words
The process according to claim 1, further comprising members selected from the group consisting of a stabilizer, a filler, a nucleating agent, a flame-proofing agent and a mold release 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) | 1983-04-01 | 1983-10-01 | 1984-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-04-01 | 1987-10-01 | 1988-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-04-01 | 1991-10-01 | 1992-04-01 | $7700.00 | Window Closed / Lapsed |