US4237238A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyisocyanurate foams based on esterified DMI oxidation residue additive
Assignee: Dow Chemical Co
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Filing: 1979-10-03
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Granted: 1980-12-02
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Expires: 1999-10-03
Abstract
Abstract Polyisocyanurate foams are disclosed which are characterized by a combination of a high degree of fire resistance with low smoke evolution, low foam friability yet high compressive strength, and, most unexpectedly, the formation of a protective intumescent char over unburnt foam when the foam is subjected to combustion. This combination of advantageous features is achieved by employing in the foam forming reaction a minor amount of a polyol mixture prepared by the transesterification, with a glycol of molecular weight from about 60 to about 400, of a residue obtained from the manufacture of dimethyl terephthalate.
Inventors
- 👤 David T. DeGuiseppi
- 👤 Richard A. Kolakowski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:10
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/42; C08G18/4205; C08G18/4208; C08G18/4225; C08G18/65; C08G18/66; C08G18/6633; C08G18/6637; C08G18/664; C08G2110/00; C08G2110/0041; C08G2110/005; C08G2115/00; C08G2115/02; C08G2170/00; C08G2170/60; Y; Y10; Y10S; Y10S521/00; Y10S521/902
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
130 words
In a cellular polymer in which the major recurring polymer unit is isocyanurate which polymer comprises the reaction product obtained by bringing together in the presence of a blowing agent, an organic polyisocyanate, a trimerization catalyst and a minor amount of a polyol the improvement which comprises employing as the polyol component from about 0.1 hydroxyl equivalent to about 0.5 hydroxyl equivalent per equivalent of said polyisocyanate of a polyol mixture prepared by the transesterification, with a glycol of molecular weight from about 60 to about 400, of a residue remaining after dimethyl terephthalate and methyl p-toluate have been removed from a dimethyl terephthalate esterified oxidate reaction product the major portion of said residue comprising a mixture of methyl and benzyl esters of benzene and biphenyl di- and tricarboxylic acids.
Claim 2
Dependent Claim
130 words
In a cellular polymer in which the major recurring polymer unit is isocyanurate which polymer comprises the reaction product obtained by bringing together in the presence of a blowing agent, an organic polyisocyanate, a trimerization catalyst and a minor amount of a polyol the improvement which comprises employing as the polyol component from about 0.1 hydroxyl equivalent to about 0.5 hydroxyl equivalent per equivalent of said polyisocyanate of a polyol mixture prepared by the transesterification, with a glycol of molecular weight from about 60 to about 400, of a residue remaining after dimethyl terephthalate and methyl p-toluate have been removed from a dimethyl terephthalate esterified oxidate reaction product the major portion of said residue comprising a mixture of methyl and benzyl esters of benzene and biphenyl di- and tricarboxylic acids.
Claim 3
Dependent Claim
16 words
A cellular polymer according to claim 1 wherein said organic polyisocyanate is a polymethylene poly(phenyl isocyanate).
Claim 4
Dependent Claim
17 words
A cellular polymer according to claim 1 wherein said esterifying glycol is ethylene glycol or diethylene glycol.
Claim 5
Dependent Claim
114 words
A cellular polymer in which the major recurring polymer unit is isocyanurate which polymer comprises the reaction product obtained by bringing together under foam forming conditions: A. a polymethylene poly(phenyl isocyanate); B. a fluorocarbon blowing agent C. an isocyanate trimerization catalyst; and D. from about 0.1 to about 0.5 equivalent, per equivalent of said polymethylene poly(phenyl isocyanate), of a polyol mixture prepared by the transesterification with ethylene glycol or diethylene glycol of a residue remaining after dimethyl terephthalate and methyl p-toluate have been removed from a dimethyl terephthalate esterified oxidate reaction product the major portion of said residue comprising a mixture of methyl and benzyl esters of benzene and biphenyl di- and tricarboxylic acids.
Claim 6
Dependent Claim
114 words
A cellular polymer in which the major recurring polymer unit is isocyanurate which polymer comprises the reaction product obtained by bringing together under foam forming conditions: A. a polymethylene poly(phenyl isocyanate); B. a fluorocarbon blowing agent C. an isocyanate trimerization catalyst; and D. from about 0.1 to about 0.5 equivalent, per equivalent of said polymethylene poly(phenyl isocyanate), of a polyol mixture prepared by the transesterification with ethylene glycol or diethylene glycol of a residue remaining after dimethyl terephthalate and methyl p-toluate have been removed from a dimethyl terephthalate esterified oxidate reaction product the major portion of said residue comprising a mixture of methyl and benzyl esters of benzene and biphenyl di- and tricarboxylic acids.
Claim 7
Dependent Claim
14 words
A cellular polymer according to claim 4 wherein diethylene glycol is the transesterification glycol.
Claim 8
Dependent Claim
69 words
A cellular polymer according to claim 5 wherein said polyol mixture (D) is characterized by a viscosity in cps at 25° C. of about 8,000 to about 30,000, a free diethylene glycol content of from about 5 to about 10 percent by weight of said mixture, a hydroxyl number within a range of from about 247 to about 363, and an acid number of about 2 to about 8.
Claim 9
Dependent Claim
64 words
A cellular polymer according to claim 6 wherein said polyol mixture (D) is comprised of: (1) from about 80 to about 99 percent by weight of said polyol mixture defined in claim 6; and (2) from about 20 to about 1 percent by weight of diethylene glycol said about 20 to about 1 percent being additional to that diethylene glycol already present in (1).
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-12-02 | 1984-06-02 | 1984-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-02 | 1988-06-02 | 1988-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-02 | 1992-06-02 | 1992-12-02 | $7700.00 | Window Closed / Lapsed |