US4256847A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rigid polyurethane foam process using lithium/zinc catalyst
Assignee: Borchers Americas Inc
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Filing: 1979-10-17
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Granted: 1981-03-17
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Expires: 1999-10-17
Abstract
Abstract A rigid polyurethane foam prepared from a foamable mixture consisting essentially of (a) an organic polyisocyanate, (b) an organic polyol, (c) a blowing agent, and (d) a catalyst consisting of a mixture of lithium and zinc salts of aliphatic or alicyclic organic monocarboxylic acids or mixtures of acids is described. The lithium and zinc salts exhibit excellent catalytic activity in a wide range of rigid foam systems with no deleterious effects on the physical properties of the foam.
Inventors
- 👤 Richard J. Spector
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:01
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/16; C08G18/22; C08G2110/00; C08G2110/0025
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
67 words
In a method for producing rigid polyurethane foam by the reaction of a foamable mixture comprising (a) an organic polyisocyanate, (b) an organic polyol, (c) a blowing agent, and (d) a catalyst the improvement comprising incorporating as the catalyst into said mixture prior to foaming, an effective amount of a mixture of lithium and zinc salts of aliphatic or alicyclic organic monocarboxylic acids or mixtures of acids.
Claim 2
Dependent Claim
67 words
In a method for producing rigid polyurethane foam by the reaction of a foamable mixture comprising (a) an organic polyisocyanate, (b) an organic polyol, (c) a blowing agent, and (d) a catalyst the improvement comprising incorporating as the catalyst into said mixture prior to foaming, an effective amount of a mixture of lithium and zinc salts of aliphatic or alicyclic organic monocarboxylic acids or mixtures of acids.
Claim 3
Dependent Claim
29 words
The method of claim 1 wherein the catalyst consists essentially of lithium and zinc salts of aliphatic or alicyclic monocarboxylic acids having from about 6 to 20 carbon atoms.
Claim 4
Dependent Claim
28 words
The method of claim 1 wherein the weight ratio of lithium to zinc in the foamable mixture is in the range of from about 1:1 to about 1:25.
Claim 5
Dependent Claim
37 words
The method of claim 1 wherein the catalyst is present in an amount sufficient to provide a total metal content of from about 0.01 to about 1% by weight based on the weight of the organic polyol.
Claim 6
Dependent Claim
29 words
The method of claim 2 wherein the weight ratio of lithium to zinc salt in the catalyst mixture is in the range of from about 95:5 to about 5:95.
Claim 7
Dependent Claim
14 words
The method of claim 1 wherein the blowing agent is a halocarbon blowing agent.
Claim 8
Dependent Claim
113 words
In a method for producing rigid polyurethane foam by the reaction of the foamable mixture comprising (a) an organic polyisocyanate, (b) an organic polyol, (c) a halocarbon blowing agent, and (d) a catalyst, the improvement comprising incorporating as the catalyst into said mixture prior to foaming, from about 0.01 to about 1% by weight based on the weight of the organic polyol of a mixture of lithium and zinc salts of aliphatic or alicyclic organic monocarboxylic acids having from about 6 to 20 carbon atoms, or mixtures of such acids and wherein the ratio of lithium to zinc in the foamable mixture is in the range of from about 1:1 to about 1:25.
Claim 9
Dependent Claim
113 words
In a method for producing rigid polyurethane foam by the reaction of the foamable mixture comprising (a) an organic polyisocyanate, (b) an organic polyol, (c) a halocarbon blowing agent, and (d) a catalyst, the improvement comprising incorporating as the catalyst into said mixture prior to foaming, from about 0.01 to about 1% by weight based on the weight of the organic polyol of a mixture of lithium and zinc salts of aliphatic or alicyclic organic monocarboxylic acids having from about 6 to 20 carbon atoms, or mixtures of such acids and wherein the ratio of lithium to zinc in the foamable mixture is in the range of from about 1:1 to about 1:25.
Claim 10
Dependent Claim
24 words
The method of claim 7 wherein a preformed mixture of lithium and zinc salts in a polar solvent is added to the foamable mixture.
Claim 11
Dependent Claim
13 words
The method of claim 8 wherein the polar solvent is an alkoxy alkanol.
References Cited (Backward Citations)
US2894919A
Cited
US3041295A
Cited
US3108975A
Cited
GB980139A
Cited
US3347804A
Cited
US3476933A
Cited
US3580873A
Cited
US3634345A
Cited
US3723367A
Cited
US3751392A
Cited
US3940517A
Cited
US3884849A
Cited
US4107069A
Cited
US4053439A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-03-16 | 1984-09-15 | 1985-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-16 | 1988-09-15 | 1989-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-16 | 1992-09-15 | 1993-03-17 | $7700.00 | Window Closed / Lapsed |