Polyisocyanurate foams based on esterified DMI oxidation residue additive
AssigneeThe Upjohn Company
InventorsDavid T. DeGuiseppi, Richard A. Kolakowski
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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.
Claims7
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.
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.
Dependencies are inferred from the claim text.