US4439593A
Expired / Lapsed
US
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Polyurethane compositions with improved storage stability
Assignee: Bayer Corp
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Filing: 1983-05-26
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Granted: 1984-03-27
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Expires: 2003-05-26
Abstract
Abstract The present invention is directed to a process for improving the storage stability of a composition containing (a) a blocked polyisocyanate component prepared by blocking the isocyanate groups of an organic polyisocyanate with a blocking agent comprising a di-C1-C12-alkyl and/or -alkoxyalkyl malonate and (b) a component comprising a compound containing at least two isocyanate-reactive hydrogens, which comprises incorporating a stabilizing amount of a compound having monofunctional reactivity towards isocyanates into the composition by adding said compound to component (a), component (b) or to the mixture of components (a) and (b). The present invention is also directed to the storage stable composition produced in accordance with the above process.
Inventors
- 👤 Robert G. Kelso
- 👤 Meena S. Ahuja
- 👤 Peter D. Schmitt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:39
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/2805; C08G18/70; C08G18/72; C08G18/80; C08G18/8061; C08G18/8093
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
89 words
A process for improving the storage stability of a composition containing (a) a blocked polyisocyanate component prepared by blocking the isocyanate groups of an organic polyisocyanate with a blocking agent comprising a di-C 1 --C 12 --alkyl and/or --alkoxyalkyl malonate and (b) a component comprising a compound containing at least two isocyanate-reactive hydrogens, which comprises incorporating a stabilizing amount of a compound having monofunctional reactivity towards isocyanate groups into said composition by adding said compound to component (a), component (b) or to the mixture of components (a) or (b).
Claim 2
Dependent Claim
89 words
A process for improving the storage stability of a composition containing (a) a blocked polyisocyanate component prepared by blocking the isocyanate groups of an organic polyisocyanate with a blocking agent comprising a di-C 1 --C 12 --alkyl and/or --alkoxyalkyl malonate and (b) a component comprising a compound containing at least two isocyanate-reactive hydrogens, which comprises incorporating a stabilizing amount of a compound having monofunctional reactivity towards isocyanate groups into said composition by adding said compound to component (a), component (b) or to the mixture of components (a) or (b).
Claim 3
Dependent Claim
16 words
The process of claim 1 wherein said organic polyisocyanate of component (a) is a polyisocyanate adduct.
Claim 4
Dependent Claim
16 words
The process of claim 1 wherein said organic polyisocyanate of component (a) is an isocyanate-terminated prepolymer.
Claim 5
Dependent Claim
15 words
The process of claim 1 wherein said isocyanate-reactive hydrogens of component (b) are hydroxyl groups.
Claim 6
Dependent Claim
38 words
The process of claim 1 wherein said compound having monofunctional reactivity towards isocyanate groups is a monoalcohol and is present in an amount greater than about 0.5% by weight based on the weight of components (a) and (b).
Claim 7
Dependent Claim
38 words
The process of claim 1 wherein up to about 60 mole % of the di-C 1 --C 12 -alkyl and/or --alkoxyalkyl malonate blocking agent is replaced by an acetoacetic acid C 1 --C 12 --alkyl or --alkoxyalkyl ester.
Claim 8
Dependent Claim
12 words
The process of claim 1 wherein said blocking agent comprises diethyl malonate.
Claim 9
Dependent Claim
63 words
A composition with improved storage stability which comprises (a) a blocked polyisocyanate component prepared by blocking the isocyanate groups of an organic polyisocyanate with a blocking agent comprising a di-C 1 --C 12 ---alkyl and/or --alkoxyalkyl malonate, (b) a component comprising a compound containing at least two isocyanate-reactive hydrogens and (c) a stabilizing amount of a compound having monofunctional reactivity towards isocyanate groups.
Claim 10
Dependent Claim
63 words
A composition with improved storage stability which comprises (a) a blocked polyisocyanate component prepared by blocking the isocyanate groups of an organic polyisocyanate with a blocking agent comprising a di-C 1 --C 12 ---alkyl and/or --alkoxyalkyl malonate, (b) a component comprising a compound containing at least two isocyanate-reactive hydrogens and (c) a stabilizing amount of a compound having monofunctional reactivity towards isocyanate groups.
Claim 11
Dependent Claim
16 words
The composition of claim 8 wherein said organic polyisocyanate of component (a) is a polyisocyanate adduct.
Claim 12
Dependent Claim
16 words
The composition of claim 8 wherein said organic polyisocyanate of component (a) is an isocyanate-terminated prepolymer.
Claim 13
Dependent Claim
15 words
The composition of claim 8 wherein said isocyanate-reactive hydrogens of component (b) are hydroxyl groups.
Claim 14
Dependent Claim
38 words
The composition of claim 8 wherein said compound having monofunctional reactivity towards isocyanate groups is a monoalcohol and is present in an amount greater than about 0.5% by weight based on the weight of components (a) and (b).
Claim 15
Dependent Claim
38 words
The composition of claim 11 wherein said compound having monofunctional reactivity towards isocyanate groups is a monoalcohol and is present in an amount greater than about 0.5% by weight based on the weight of components (a) and (b).
Claim 16
Dependent Claim
36 words
The composition of claim 8 wherein up to about 60 mole % of the di-C 1 --C 12 --alkyl and/or --alkoxyalkyl malonate is replaced by an acetoacetic acid C 1 --C 12 --alkyl or --alkoxyalkyl ester.
Claim 17
Dependent Claim
12 words
The composition of claim 8 wherein said blocking agent comprises diethyl malonate.
Claim 18
Dependent Claim
64 words
A composition with improved storage stability which comprises (a) a blocked polyisocyanate component prepared by blocking the isocyanate groups of a polyisocyanate adduct with a blocking agent comprising diethyl malonate, (b) a component comprising a compound containing at least 2 hydroxyl groups and (c) a monoalcohol in an amount greater than about 0.5% by weight based on the weight of components (a) and (b).
Claim 19
Dependent Claim
64 words
A composition with improved storage stability which comprises (a) a blocked polyisocyanate component prepared by blocking the isocyanate groups of a polyisocyanate adduct with a blocking agent comprising diethyl malonate, (b) a component comprising a compound containing at least 2 hydroxyl groups and (c) a monoalcohol in an amount greater than about 0.5% by weight based on the weight of components (a) and (b).
Claim 20
Dependent Claim
14 words
The composition of claim 16 wherein said polyisocyanate adduct is prepared from 1,6-hexamethylene diisocyanate.
Claim 21
Dependent Claim
26 words
The composition of claim 16 wherein component (b) comprises a member selected from the group consisting of polyester polyols, polycarbonates containing hydroxyl groups and polyhydroxy polyacrylates.
Claim 22
Dependent Claim
26 words
The composition of claim 17 wherein component (b) comprises a member selected from the group consisting of polyester polyols, polycarbonates containing hydroxyl groups and polyhydroxy polyacrylates.
Claim 23
Dependent Claim
22 words
The composition of claim 16 wherein up to about 60 mole % of the diethyl malonate blocking agent is replaced by ethylacetoacetate.
Claim 24
Dependent Claim
22 words
The composition of claim 18 wherein up to about 60 mole % of the diethyl malonate blocking agent is replaced by ethylacetoacetate.
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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) | 1987-03-27 | 1987-09-26 | 1988-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-27 | 1991-09-26 | 1992-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-27 | 1995-09-26 | 1996-03-27 | $7700.00 | Window Closed / Lapsed |