Patent US5246993A successfully refreshed from Google Patents.
US5246993A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oligomeric carbodiimides
Assignee: BASF SE
•
Filing: 1992-08-07
•
Granted: 1993-09-21
•
Expires: 2012-08-07
Abstract
Abstract Oligomeric carbodiimides having an average degree of condensation of from 2 to 30, obtainable by oligocondensation of a) from 40 to 100 mol % of 2,4'-diisocyanatodiphenylmethane or of a 3,3',5,5'-tetra-C 1 -C 4 -alkyl-4,4'-diisocyanatodiphenylmethane and b) from 0 to 60 mol % of a further bi- or polyfunctional aromatic isocyanate and c) if desired, complete or partial reaction of the remaining free isocyanate groups of the oligomers with an aliphatic, araliphatic or cycloaliphatic alcohol or amine, are used mainly for stabilizing polyester-containing polyurethanes against hydrolytic degradation.
Inventors
- 👤 Deitrich Scherzer
- 👤 Roland Minges
- 👤 Friedhelm Lehrich
- 👤 Werner Langer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:54
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/16; C08K5/29; C08G; C08G18/00; C08G18/02; C08G18/025; C08G18/06; C08G18/28; C08G18/2805; C08G18/2815; C08G18/282; C08G18/70; C08G18/72; C08G18/77; C08G18/78; C08G18/79; C08G18/797; C08L; C08L67/00
Claims Analysis
Total Claims: 32
Claim 1
Independent Claim
76 words
An oligomeric carbodiimide having an average degree of condensation of from 2 to 30, obtainable by oligocondensation of a) from 40 to 100 mol % of 2,4'-diisocyanatodiphenylmethane or of a 3,3',5,5'-tetra-C 1 -C 4 -alkyl-4,4'-diisocyanatodiphenylmethane and b) from 0 to 60 mol % of a further bi- or polyfunctional aromatic isocyanate and c) optionally, complete or partial reaction of the remaining free isocyanate groups of the oligomers with an aliphatic, araliphatic or cycloaliphatic alcohol or amine.
Claim 2
Dependent Claim
76 words
An oligomeric carbodiimide having an average degree of condensation of from 2 to 30, obtainable by oligocondensation of a) from 40 to 100 mol % of 2,4'-diisocyanatodiphenylmethane or of a 3,3',5,5'-tetra-C 1 -C 4 -alkyl-4,4'-diisocyanatodiphenylmethane and b) from 0 to 60 mol % of a further bi- or polyfunctional aromatic isocyanate and c) optionally, complete or partial reaction of the remaining free isocyanate groups of the oligomers with an aliphatic, araliphatic or cycloaliphatic alcohol or amine.
Claim 3
Dependent Claim
16 words
An oligomeric carbodiimide as claimed in claim 1, obtainable from 100 mol % of component (a).
Claim 4
Dependent Claim
34 words
An oligomeric carbodiimide as claimed in claim 1 obtainable by reacting the remaining free isocyanate groups of the oligomer from component (a) or (b) with a C 1 -C 12 -alkanol as component (c).
Claim 5
Dependent Claim
19 words
An oligomeric carbodiimide as claimed in claim 1 having an average degree of condensation of from 2 to 10.
Claim 6
Dependent Claim
127 words
A process for the preparation of an oligomeric carbodiimide by condensation of bi- or polyfunctional aromatic isocyanates, wherein a) from 40 to 100 mol % of 2,4'-diisocyanatodiphenylmethane or of a 3,3',5,5'-tetra-C 1 -C 4 -alkyl-4,4'-diisocyanatodiphenylmethane and b) from 0 to 60 mol % of a further bi- or polyfunctional aromatic isocyanate are used as starting materials and c) the free isocyanate groups of the resulting oligomers are, optionally, completely or partially reacted with an aliphatic, araliphatic or cycloaliphatic alcohol or aminex; or not more than 60% of the isocyanate groups of component (a) or (b) are first reacted with component (c) before the condensation, the condensation is then carried out and, optionally, the remaining still free isocyanate groups of the oligomers are then reacted with component (c).
Claim 7
Dependent Claim
127 words
A process for the preparation of an oligomeric carbodiimide by condensation of bi- or polyfunctional aromatic isocyanates, wherein a) from 40 to 100 mol % of 2,4'-diisocyanatodiphenylmethane or of a 3,3',5,5'-tetra-C 1 -C 4 -alkyl-4,4'-diisocyanatodiphenylmethane and b) from 0 to 60 mol % of a further bi- or polyfunctional aromatic isocyanate are used as starting materials and c) the free isocyanate groups of the resulting oligomers are, optionally, completely or partially reacted with an aliphatic, araliphatic or cycloaliphatic alcohol or aminex; or not more than 60% of the isocyanate groups of component (a) or (b) are first reacted with component (c) before the condensation, the condensation is then carried out and, optionally, the remaining still free isocyanate groups of the oligomers are then reacted with component (c).
Claim 8
Dependent Claim
20 words
A process as claimed in claim 5, wherein the condensation is carried out in the presence of a phospholene oxide.
Claim 9
Dependent Claim
20 words
A substance sensitive to hydrolysis, containing an oligomeric carbodiimide as claimed in claim 1 as a stabilizer against hydrolytic degradation.
Claim 10
Dependent Claim
21 words
A polymer containing ester groups, which contains an oligomeric carbodiimide as claimed in claim 1 as a stabilizer against hydrolytic degradation.
Claim 11
Dependent Claim
42 words
A process for the preparation of a mono-, oligoor polyester by reacting the corresponding acid or acid derivative with an alcohol, wherein, after reaching the desired conversion, the esterification reaction is terminated by adding an oligomeric carbodiimide as claimed in claim 1.
Claim 12
Dependent Claim
18 words
An oligomeric carbodiimide as claimed in claim 2, having an average degree of condensation from 2 to 10.
Claim 13
Dependent Claim
20 words
A substance sensitive to hydrolysis, containing an oligomeric carbodiimide as claimed in claim 2 as a stabilizer against hydrolytic degradation.
Claim 14
Dependent Claim
20 words
A polymer containing ester groups, which an oligomeric carbodiimide as claimed in claim 2 as a stabilizer against hydrolytic degradation.
Claim 15
Dependent Claim
42 words
An oligomeric carbodiimide as claimed in claim 2, comprising a mono-, oligo-, or polyester prepared by reacting a corresponding acid or acid derivative with an alcohol, and after reaching the desired conversion, the esterification reaction is terminated by adding said oligomeric carbodiimide.
Claim 16
Dependent Claim
34 words
An oligomeric carbodiimide as claimed in claim 2, obtainable by reacting the remaining free isocyanate groups of the oligomer from component (a) or (b) with a C 1 -C 12 -alkanol as component (c).
Claim 17
Dependent Claim
19 words
An oligomeric carbodiimide as claimed in claim 3, having an average degree of condensation of from 2 to 10.
Claim 18
Dependent Claim
20 words
A substance sensitive to hydrolysis, containing an oligomeric carbodiimide as claimed in claim 3 as a stabilizer against hydrolytic degradation.
Claim 19
Dependent Claim
21 words
A polymer containing ester groups, which contains an oligomeric carbodiimide as claimed in claim 3 as a stabilizer against hydrolytic degradation.
Claim 20
Dependent Claim
42 words
An oligomeric carbodiimide as claimed in claim 3, comprising a mono-, oligo-, or polyester prepared by reacting a corresponding acid or acid derivative with an alcohol, and after reaching the desired conversion, the esterification reaction is terminated by adding said oligomeric carbodiimide.
Claim 21
Dependent Claim
20 words
A substance sensitive to hydrolysis, containing an oligomeric carbodiimide as claimed in claim 4 as a stabilizer against hydrolytic degradation.
Claim 22
Dependent Claim
21 words
A polymer containing ester groups, which contains an oligomeric carbodiimide as claimed in claim 4 as a stabilizer against hydrolytic degradation.
Claim 23
Dependent Claim
42 words
An oligomeric carbodiimide as claimed in claim 4, comprising a mono-, oligo-, or polyester prepared by reacting a corresponding acid or acid derivative with an alcohol, and after reaching the desired conversion, the esterification reaction is terminated by adding said oligomeric carbodiimide.
Claim 24
Dependent Claim
20 words
A substance sensitive to hydrolysis, containing an oligomeric carbodiimide as claimed in claim 6 as a stabilizer against hydrolytic degradation.
Claim 25
Dependent Claim
21 words
A polymer containing ester groups, which contains an oligomeric carbodiimide as claimed in claim 6 as a stabilizer against hydrolytic degradation.
Claim 26
Dependent Claim
44 words
An oligomeric carbodiimide as claimed in claim 6, comprising the preparation of a mono-, oligo-, or polyester be reacting a corresponding acid or acid derivative with an alcohol, and after reaching the desired conversion, the esterification reaction is terminated by adding said oligomeric carbodiimide.
Claim 27
Dependent Claim
31 words
A method for removing water or traces of acid from low molecular weight or high molecular weight compounds by adding to said compounds an oligomeric carbodiimide as claimed in claim 1.
Claim 28
Dependent Claim
31 words
A method for removing water or traces of acid from low molecular weight or high molecular weight compounds by adding to said compounds an oligomeric carbodiimide as claimed in claim 2.
Claim 29
Dependent Claim
31 words
A method for removing water or traces of acid from low molecular weight or high molecular weight compounds by adding to said compounds an oligomeric carbodiimide as claimed in claim 3.
Claim 30
Dependent Claim
31 words
A method for removing water or trades of acid from low molecular weight or high molecular weight compounds by adding to said compounds an oligomeric carbodiimide as claimed in claim 4.
Claim 31
Dependent Claim
31 words
A method for removing water or traces of acid from low molecular weight or high molecular weight compounds by adding to said compounds a oligomeric carbodiimide as claimed in claim 5.
Claim 32
Dependent Claim
31 words
A method for removing water or traces of acid from low molecular weight or high molecular weight compounds by adding to said compounds an oligomeric carbodiimide as claimed in claim 6.
References Cited (Backward Citations)
US2941966A
Cited
US2941983A
Cited
DE2248751A1
Cited
US4076945A
Cited
FR2304635A1
Cited
US4071503A
Cited
US4604210A
Cited
EP0449143A2
Cited
CA2043820A1
Cited
EP0460481A2
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-09-20 | 1997-03-22 | 1997-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-09-20 | 2001-03-22 | 2001-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-09-20 | 2005-03-22 | 2005-09-21 | $7700.00 | Window Closed / Lapsed |