US4033908A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyisocyanurate compositions and foams of improved friability and process of preparing same
Assignee: Lyondell Chemical Technology LP
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Filing: 1975-08-25
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Granted: 1977-07-05
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Expires: 1995-08-25
Abstract
Abstract In a process of preparing a polyisocyanurate foam, which process comprises: reacting a polyisocyanate in the presence of a trimerization catalyst and an expanding amount of an inert blowing agent to provide a polyisocyanurate foam, the improvement which comprises: carrying out the reaction in the presence of a plasticizing amount of a nonvolatile liquid carbonate to produce a polyisocyanurate foam having improved friability and dimensional stability properties.
Inventors
- 👤 Henry S. Hopkins, Jr.
- 👤 Donald L. Vargo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:22
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/02; C08G18/022; Y; Y10; Y10S; Y10S521/00; Y10S521/902
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
72 words
In a process of preparing a polyisocyanurate foam, which process comprises: reacting a polyisocyanate in the presence of a trimerization catalyst and an expanding amount of an inert blowing agent in a foamable composition to provide a polyisocyanurate foam, the improvement which comprises: carrying out the reaction in the presence of a plasticizing amount of a nonreactive liquid organic carbonate, thereby producing a polyisocyanurate foam having improved friability and dimensional stability properties.
Claim 2
Dependent Claim
72 words
In a process of preparing a polyisocyanurate foam, which process comprises: reacting a polyisocyanate in the presence of a trimerization catalyst and an expanding amount of an inert blowing agent in a foamable composition to provide a polyisocyanurate foam, the improvement which comprises: carrying out the reaction in the presence of a plasticizing amount of a nonreactive liquid organic carbonate, thereby producing a polyisocyanurate foam having improved friability and dimensional stability properties.
Claim 3
Dependent Claim
19 words
The process of claim 1 wherein the carbonate comprises from about 0.5 to 50% by weight of the composition.
Claim 4
Dependent Claim
16 words
The process of claim 1 wherein the carbonate is a C 2 -C 6 cyclic carbonate.
Claim 5
Dependent Claim
25 words
The process of claim 1 wherein the carbonate is propylene carbonate in an amount of from about 4 to 10% by weight of the composition.
Claim 6
Dependent Claim
21 words
The process of claim 1 wherein the trimerization catalyst is a cocatalyst which comprises a dialkylaminoalkyl phenol and a triethylene diamine.
Claim 7
Dependent Claim
12 words
The process of claim 5 wherein the dialkylaminoalkyl phenol is dimethylaminomethyl phenol.
Claim 8
Dependent Claim
31 words
The process of claim 1 wherein the blowing agent is an inert fluorine-containing lower alkene liquid or hydrocarbon liquid which volatilizes during the exothermic catalytic reaction to produce the polyisocyanurate foam.
Claim 9
Dependent Claim
17 words
The process of claim 1 wherein the reaction composition includes a silicone surfactant as a cell-control agent.
Claim 10
Dependent Claim
12 words
The process of claim 1 wherein the polyisocyanate is an organic diisocyanate.
Claim 11
Dependent Claim
26 words
The process of claim 1 wherein the polyisocyanate is a diisocyanate and the reaction consists essentially of the diisocyanate to produce an unmodified trimer polyisocyanurate foam.
Claim 12
Dependent Claim
13 words
The process of claim 1 wherein the polyisocyanate is an isocyanate-terminated urethane prepolymer.
Claim 13
Dependent Claim
108 words
In a process of preparing a polyisocyanurate foam consisting essentially of recurring isocyanurate linkages, which process comprises: reacting an organic diisocyanate, in the presence of a dialkylaminoalkyl phenol and a tris ethylene diamine as a cocatalyst and in the presence of a blowing amount of an inert blowing agent which volatilizes during the exothermic catalytic reaction, in a foamable composition to provide a polyisocyanurate foam of improved friability and dimensional stability, the improvement which comprises: carrying out the reaction in the presence of from about 1 to 10% by weight of the composition of nonreactive propylene carbonate to provide a polyisocyanurate foam of improved friability and dimensional stability.
Claim 14
Dependent Claim
108 words
In a process of preparing a polyisocyanurate foam consisting essentially of recurring isocyanurate linkages, which process comprises: reacting an organic diisocyanate, in the presence of a dialkylaminoalkyl phenol and a tris ethylene diamine as a cocatalyst and in the presence of a blowing amount of an inert blowing agent which volatilizes during the exothermic catalytic reaction, in a foamable composition to provide a polyisocyanurate foam of improved friability and dimensional stability, the improvement which comprises: carrying out the reaction in the presence of from about 1 to 10% by weight of the composition of nonreactive propylene carbonate to provide a polyisocyanurate foam of improved friability and dimensional stability.
Claim 15
Dependent Claim
47 words
A polyisocyanurate foam which comprises a cured, cellular, polyisocyanurate foam which contains a plasticizing amount of a nonreacted liquid organic carbonate therein, the foam characterized by improved friability and substantially no observable shrinkage on heat-aging at temperatures up to 200° F. for times up to 4 hours.
Claim 16
Dependent Claim
47 words
A polyisocyanurate foam which comprises a cured, cellular, polyisocyanurate foam which contains a plasticizing amount of a nonreacted liquid organic carbonate therein, the foam characterized by improved friability and substantially no observable shrinkage on heat-aging at temperatures up to 200° F. for times up to 4 hours.
Claim 17
Dependent Claim
26 words
The foam of claim 13 wherein the carbonate comprises from about 0.5 to 50% by weight of the foamable composition from which the foam is prepared.
Claim 18
Dependent Claim
11 words
The foam of claim 13 wherein the carbonate is propylene carbonate.
Claim 19
Dependent Claim
32 words
The foam of claim 13 wherein the carbonate is propylene carbonate in an amount of from about 4 to 10% by weight of the foamable composition from which the foam is prepared.
Claim 20
Dependent Claim
15 words
The foam of claim 13 wherein the polyisocyanurate foam consists essentially of recurring isocyanurate linkages.
Claim 21
Dependent Claim
33 words
The foam of claim 13 wherein the foam is derived from the reaction of an organic diisocyanate in the presence of a trimerization catalyst which comprises a dialkylaminoalkyl phenol and a triethylene diamine.
Claim 22
Dependent Claim
16 words
The foam of claim 13 wherein the polyisocyanate foam is derived from a polyethylene polyphenol diisocyanate.
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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) | 1980-07-04 | 1981-01-03 | 1981-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-04 | 1985-01-03 | 1985-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-04 | 1989-01-03 | 1989-07-05 | $7700.00 | Window Closed / Lapsed |