US4377670A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copolymers based on aliphatic polycarbonates and lactams
Assignee: Bayer AG
•
Filing: 1981-10-23
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Granted: 1983-03-22
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Expires: 2001-10-23
Abstract
Abstract Anionic copolymers of lactams and aliphatic polycarbonates having urethane and carboxylic acid ester groups, preferably having recurring structural units of the formula: --NH--CO--O--Y--O--CO--(CR.sub.2).sub.n -- wherein R represents hydrogen or C 1 -C 4 -alkyl; n represents an integer of from 2 to 13; Y represents the residue of an alcohol of the following formula: HO--X--OH, wherein X represents an open-chain, cyclic or mixed open-chain-cyclic alkylene radical having from 2 to 12 carbon atoms which is optionally substituted by C 1 -C 4 -alkyl and optionally interrupted by from 1 to 3 oxygen atoms, or a polyethylene glycol having a molecular weight up to 10,000 or an alkoxylation product of bifunctional phenols.
Inventors
- 👤 Heinrich Krimm
- 👤 Hans-Josef Buysch
- 👤 Artur Botta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:57
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/44; C08G71/00; C08G71/04
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
110 words
A process for the production of a copolymer having weight average molecular weights between 1,000 and 150,000 determined by light scattering measurement and containing urethane and carboxylic acid ester groups, which comprises heating at a temperature from 100° to 250° C. an anhydrous mixture of a lactam and an aliphatic polycarbonate having a molecular weight in the range from 1,000 to 500,000 determined by light scattering measurements in the presence of an alkaline catalyst in amounts from 0.001 to 1% by weight based on the weight of the reactants which mixtures have from 20 to 80% by weight of lactam and from 80 to 20% by weight of said polycarbonate.
Claim 2
Dependent Claim
110 words
A process for the production of a copolymer having weight average molecular weights between 1,000 and 150,000 determined by light scattering measurement and containing urethane and carboxylic acid ester groups, which comprises heating at a temperature from 100° to 250° C. an anhydrous mixture of a lactam and an aliphatic polycarbonate having a molecular weight in the range from 1,000 to 500,000 determined by light scattering measurements in the presence of an alkaline catalyst in amounts from 0.001 to 1% by weight based on the weight of the reactants which mixtures have from 20 to 80% by weight of lactam and from 80 to 20% by weight of said polycarbonate.
Claim 3
Dependent Claim
21 words
A process as claimed in claim 1 in which the reaction is carred out in the presence of an aprotic solvent.
Claim 4
Dependent Claim
69 words
A process as claimed in claim 1 in which the lactam corresponds to the formula: ##STR3## wherein R and n are as defined in claim 3; and the polycarbonate is based on (a) an alcohol corresponding to the formula: HO--X--OH wherein X is as defined in claim 3; (b) a polyethylene glycol having a molecular weight of up to 10,000; or (c) an alkoxylation product of a bifunctional phenol.
Claim 5
Dependent Claim
17 words
A copolymer product obtained from the process according to claim 10 or claim 2 or claim 3.
Claim 6
Dependent Claim
94 words
A copolymer product obtained from the process according to claim 4 and containing structural units of the formula ##STR4## wherein R is hydrogen or alkyl having 1 to 4 carbon atoms; n is an integer from 2 to 13; and X is alkylene of 2 to 12 carbon atoms which is open-chain, cyclic or open-chain/cyclic and which is unsubstituted or substituted by alkyl having 1 to 4 carbon atoms and which is interrupted by zero to 3 oxygen atoms, a polyethylene glycol moiety or a moiety from an alkoxylation product of a bifunctional phenol.
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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) | 1986-03-21 | 1986-09-20 | 1987-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-03-21 | 1990-09-20 | 1991-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-03-21 | 1994-09-20 | 1995-03-22 | $7700.00 | Window Closed / Lapsed |