Patent US4595534A successfully refreshed from Google Patents.
US4595534A
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Process for the production of uretdione group-containing polyisocyanates
Assignee: Bayer AG
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Filing: 1985-05-21
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Granted: 1986-06-17
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Expires: 2005-05-21
Abstract
Abstract The present invention relates to a process for the production of uretdione group-containing polyisocyanates having aliphatically- and/or cycloaliphatically-bound isocyanate groups by dimerizing a portion of the isocyanate groups of organic diisocyanates having aliphatically- and/or cycloaliphatically-bound isocyanate groups in the presence of a dimerization-accelerating catalyst and terminating the dimerization reaction when the desired degree of dimerization in each case has been reached by addition of a catalyst poison or by the removal of the catalyst by distillation, characterized in that antimony(V)fluoride is used as the catalyst.
Inventors
- 👤 Hans-Joachim Scholl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 18:31
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/77; C08G18/78; C08G18/79; C08G18/798; C07; C07D; C07D229/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
69 words
A process for the production of a uretdione group-containing polyisocyanate having aliphatically- and/or cycloaliphatically-bound isocyanate groups which comprises dimerizing a portion of the isocyanate groups of an organic diisocyanate having aliphatically- and/or cycloalphatically-bound isocyanate groups in the presence of antimony(V)fluoride and terminating the dimerization reaction when the desired degree of dimerization has been reached by the addition of a catalyst poison or by the removal of antimony(V)fluoride by distillation.
Claim 2
Dependent Claim
69 words
A process for the production of a uretdione group-containing polyisocyanate having aliphatically- and/or cycloaliphatically-bound isocyanate groups which comprises dimerizing a portion of the isocyanate groups of an organic diisocyanate having aliphatically- and/or cycloalphatically-bound isocyanate groups in the presence of antimony(V)fluoride and terminating the dimerization reaction when the desired degree of dimerization has been reached by the addition of a catalyst poison or by the removal of antimony(V)fluoride by distillation.
Claim 3
Dependent Claim
11 words
The process of claim 1 wherein said organic diisocyanate is 1,6-diisocyanato-hexane.
Claim 4
Dependent Claim
20 words
The process of claim 1 which comprises removing unreacted diisocyanate by thin layer distillation on completion of the dimerization reaction.
Claim 5
Dependent Claim
20 words
The process of claim 2 which comprises removing unreacted diisocyanate by thin layer distillation on completion of the dimerization reaction.
Claim 6
Dependent Claim
18 words
The process of claim 1 wherein said catalyst poison is an organic carboxylic acid, zinc powder or sulphur.
Claim 7
Dependent Claim
18 words
The process of claim 2 wherein said catalyst poison is an organic carboxylic acid, zinc powder or sulphur.
Claim 8
Dependent Claim
18 words
The process of claim 3 wherein said catalyst poison is an organic carboxylic acid, zinc powder or sulphur.
Claim 9
Dependent Claim
18 words
The process of claim 4 wherein said catalyst poison is an organic carboxylic acid, zinc powder or sulphur.
References Cited (Backward Citations)
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CA894292A
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US3108100A
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DE1670720A1
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GB1200432A
Cited
GB2113673A
Cited
DE3227779A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-06-16 | 1989-12-16 | 1990-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-06-16 | 1993-12-16 | 1994-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-06-16 | 1997-12-16 | 1998-06-17 | $7700.00 | Window Closed / Lapsed |