Patent US4390640A successfully refreshed from Google Patents.
US4390640A
Expired / Lapsed
US
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Process for the production of optionally-foamed polyurethanes
Assignee: Bayer AG
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Filing: 1982-01-25
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Granted: 1983-06-28
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Expires: 2002-01-25
Abstract
Abstract This invention relates to a process for the production of polyurethanes, particularly polyurethane foam moldings having a compact skin and a cellular core, using special tin activators.
Inventors
- 👤 Werner Rasshofer
- 👤 Geza Avar
- 👤 Hans-Albrecht Freitag
- 👤 Gerhard Grogler
- 👤 Richard Kopp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 11:32
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/16; C08G18/22; C08G18/24; C08G18/244; C08G18/246
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
157 words
A process for the production of optionally-foamed polyurethanes comprising reacting polyisocyanates with organic compounds containing at least two isocyanate-reactive hydrogen atoms and having molecular weights from 400 to 10,000 in the presence of activators, characterized in that the activators used are compounds corresponding to the general formula: ##STR14## in which R and R 1 may be the same or different and represent C 1 -C 20 -alkyl, C 5 -C 7 -cycloalkyl or C 7 -C 30 -alkaryl radicals; Hal represents a halogen atom; R 2 represents a halogen atom; R 2 represents a saturated aliphatic radical containing from 1 to 30 carbon atoms; an unsaturated aliphatic radical containing from 2 to 18 carbon atoms; a cycloaliphatic radical containing from 4 to 7 carbon atoms; or an aromatic radical containing from 6 to 14 carbon atoms; X represents hydrogen or a group corresponding to the formula ##STR15## and n is an integer of from 1 to 3.
Claim 2
Dependent Claim
157 words
A process for the production of optionally-foamed polyurethanes comprising reacting polyisocyanates with organic compounds containing at least two isocyanate-reactive hydrogen atoms and having molecular weights from 400 to 10,000 in the presence of activators, characterized in that the activators used are compounds corresponding to the general formula: ##STR14## in which R and R 1 may be the same or different and represent C 1 -C 20 -alkyl, C 5 -C 7 -cycloalkyl or C 7 -C 30 -alkaryl radicals; Hal represents a halogen atom; R 2 represents a halogen atom; R 2 represents a saturated aliphatic radical containing from 1 to 30 carbon atoms; an unsaturated aliphatic radical containing from 2 to 18 carbon atoms; a cycloaliphatic radical containing from 4 to 7 carbon atoms; or an aromatic radical containing from 6 to 14 carbon atoms; X represents hydrogen or a group corresponding to the formula ##STR15## and n is an integer of from 1 to 3.
Claim 3
Dependent Claim
14 words
A process according to claim 1, characterized in that, Hal is a chlorine atom.
Claim 4
Dependent Claim
45 words
A process according to claim 1, characterized in that the activators are used in a quantity of from 0.05 to 5% by weight, based on the compounds containing at least 2 active hydrogen atoms and having molecular weights in the range from 400 to 10,000.
Claim 5
Dependent Claim
24 words
A process according to claim 1 or claim 3, characterized in that foam moldings having a compact skin and a cellular core are produced.
Claim 6
Dependent Claim
22 words
A process as claimed in claim 1 or claim 3, characterized in that aliphatic and/or alicyclic polyisocyanates are used as the polyisocyanates.
References Cited (Backward Citations)
US3306926A
Cited
US3398169A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-06-27 | 1986-12-27 | 1987-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-06-27 | 1990-12-27 | 1991-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-06-27 | 1994-12-27 | 1995-06-28 | $7700.00 | Window Closed / Lapsed |