US3989651A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalyst for sprayable polyisocyanurate foam composition
Assignee: Pharmacia and Upjohn Co
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Filing: 1974-07-09
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Granted: 1976-11-02
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Expires: 1994-07-09
Abstract
Abstract A novel process for the preparation of polyisocyanurate spray foams is disclosed. The catalyst combination comprises (i) N,N-dimethylcyclohexylamine, and (ii) a tetra (lower-alkyl) quaternary ammonium salt of an alkanoic acid. The use of this catalyst combination in the preparation of polyisocyanurate spray foams enables the systems to be sprayed under conditions of low ambient temperature upon cold substrates and to achieve good adhesion between the foam and substrate under such conditions. The polyisocyanurate foams produced using the novel catalyst combination of the invention are characterized by having high resistance to flame and heat distortion.
Inventors
- 👤 Robert J. Lockwood
- 👤 Richard H. Roess
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:34
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/09; C08G18/092; C08G18/16; C08G18/18; C08G18/1816; C08G18/1875; Y; Y10; Y10S; Y10S521/00; Y10S521/902; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31547
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
115 words
A process for the preparation of a composition capable of being sprayed to form a foam in which the major recurring polymer unit is isocyanurate, which process comprises bringing together in the presence of a blowing agent under spray foam conditions: a. an aromatic polyisocyanate; b. a minor amount of polyol; and c. a catalyst for trimerizing said polyisocyanate comprising: i from about 0.002 to about 0.0315 equivalent per equivalent of said polyisocyanate of N,N-dimethylcyclohexylamine; and ii. from about 0.0055 to about 0.022 equivalent per equivalent of said polyisocyanate of a tetra (lower-alkyl) ammonium lower alkanoic acid salt selected from the group consisting of tetramethylammonium acetate, tetraethylammonium acetate, tetramethylammonium propionate, tetramethylammonium octanoate, and tetramethylammonium 2-ethylhexanoate.
Claim 2
Dependent Claim
115 words
A process for the preparation of a composition capable of being sprayed to form a foam in which the major recurring polymer unit is isocyanurate, which process comprises bringing together in the presence of a blowing agent under spray foam conditions: a. an aromatic polyisocyanate; b. a minor amount of polyol; and c. a catalyst for trimerizing said polyisocyanate comprising: i from about 0.002 to about 0.0315 equivalent per equivalent of said polyisocyanate of N,N-dimethylcyclohexylamine; and ii. from about 0.0055 to about 0.022 equivalent per equivalent of said polyisocyanate of a tetra (lower-alkyl) ammonium lower alkanoic acid salt selected from the group consisting of tetramethylammonium acetate, tetraethylammonium acetate, tetramethylammonium propionate, tetramethylammonium octanoate, and tetramethylammonium 2-ethylhexanoate.
Claim 3
Dependent Claim
27 words
A process according to claim 1 wherein the polyisocyanate is polymethylene polyphenyl isocyanate containing from about 30 to about 85 percent by weight of methylenebis (phenyl isocyanate).
Claim 4
Dependent Claim
13 words
A process according to claim 1 wherein the ammonium salt is tetramethylammonium 2-ethylhexanoate.
Claim 5
Dependent Claim
33 words
A process according to claim 1 wherein the ammonium salt is present in the form of a solution containing from about 20 to about 80 percent by weight of salt in a diluent.
Claim 6
Dependent Claim
88 words
A process for the preparation of a composition capable of being sprayed to form a foam in which the major recurring polymer unit is isocyanurate, which process comprises bringing together in the presence of a blowing agent under spray foam conditions: a. an aromatic polyisocyanate; b. a minor amount of polyol; and c. a catalyst comprising: i. from about 0.002 to about 0.0315 equivalent per equivalent of said polyisocyanate of N,N-dimethylcyclohexylamine; and ii. from about 0.0055 to about 0.022 equivalent per equivalent of said polyisocyanate of tetramethylammonium 2-ethylhexanoate.
Claim 7
Dependent Claim
88 words
A process for the preparation of a composition capable of being sprayed to form a foam in which the major recurring polymer unit is isocyanurate, which process comprises bringing together in the presence of a blowing agent under spray foam conditions: a. an aromatic polyisocyanate; b. a minor amount of polyol; and c. a catalyst comprising: i. from about 0.002 to about 0.0315 equivalent per equivalent of said polyisocyanate of N,N-dimethylcyclohexylamine; and ii. from about 0.0055 to about 0.022 equivalent per equivalent of said polyisocyanate of tetramethylammonium 2-ethylhexanoate.
Claim 8
Dependent Claim
27 words
A process according to claim 5 wherein the polyisocyanate is polymethylene polyphenyl isocyanate containing from about 30 to about 85 percent by weight of methylenebis (phenyl isocyanate).
Claim 9
Dependent Claim
33 words
A process according to claim 5 wherein said ammonium salt is present in the form of a solution containing from about 20 to about 80 percent by weight of salt in a diluent.
Claim 10
Dependent Claim
12 words
A process according to claim 7 wherein said diluent is ethylene glycol.
References Cited (Backward Citations)
US2779689A
Cited
GB908337A
Cited
GB1155768A
Cited
US3487080A
Cited
US3745133A
Cited
US3849349A
Cited
US3816339A
Cited
US3892687A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-11-02 | 1980-05-03 | 1980-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-11-02 | 1984-05-03 | 1984-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-11-02 | 1988-05-03 | 1988-11-02 | $7700.00 | Window Closed / Lapsed |