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Polyisocyanurate foams are prepared by reacting together an organic polyisocyanate, a blowing agent, a trimerization catalyst, and a minor amount of a polyol blend comprising (a) about 5 percent to about 95 percent by weight of said blend of an alkylene oxide adduct of an aromatic amine of the for

Polyisocyanurate foams are prepared by reacting together an organic polyisocyanate, a blowing agent, a trimerization catalyst, and a minor amount of a polyol blend comprising (a) about 5 percent to about 95 percent by weight of said blend of an alkylene oxide adduct of an aromatic amine of the formula ##STR## wherein Z is a divalent aromatic radical, x, x', y, and y' each independently have an average value from about 1 to about 5, and each R is independently selected from the group consisting of hydrogen, alkyl or aryl, provided that the adduct is capped with ethylene oxide units, and (b) about 5 percent to about 95 percent by weight of said blend of an aromatic polyester polyol having a molecular weight of from about 150 to about 5,000. Laminates of such foams exhibit a high degree of fire resistance, low foam friability, high compressive strength, and excellent facer adhesion.

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1. A polyisocyanurate foam comprising the reaction product of an organic polyisocyanate, a blowing agent, a trimerization catalyst, and a minor amount of a polyol blend comprising (a) about 5 percent to about 95 percent by weight of said blend of an alkylene oxide adduct of an aromatic amine of t

1. A polyisocyanurate foam comprising the reaction product of an organic polyisocyanate, a blowing agent, a trimerization catalyst, and a minor amount of a polyol blend comprising (a) about 5 percent to about 95 percent by weight of said blend of an alkylene oxide adduct of an aromatic amine of the formula ##STR## wherein Z is a divalent aromatic radical, x, x', y, and y' each independently have an average value from about 1 to about 5, and each R is independently selected from the group consisting of hydrogen, alkyl or aryl, provided that the adduct is capped with ethylene oxide units, and (b) about 5 percent to about 95 percent by weight of said blend of an aromatic polyester polyol having a molecular weight of from about 150 to about 5,000. 2. The polyisocyanurate foam of claim 1 wherein said organic polyisocyanate is a polymethylene polyphenylisocyanate. 3. The polyisocyanurate foam of claim 2 wherein said alkylene oxide adduct of an aromatic amine is an ethylene oxide adduct of toluene diamine isomers of the formula ##STR## wherein the average number of oxyethylene units per polyoxyethylene chain is from 2 to 3. 4. The polyisocyanurate foam of claim 1 wherein said organic polyisocyanate is a mixture of components of the formula ##STR## wherein n is an integer from 0 to 8 inclusive, and said mixture has: (a) a functionality of 2.1 to 3.2, (b) an equivalent weight between 120 and 180, and (c) a viscosity at 25° C. between 150 and 2500 centipoises. 5. The polyisocyanurate foam of claim 1 wherein said aromatic polyester polyol is a polyol mixture prepared by the transesterification, with a glycol of molecular weight from about 60 to 400, of a by-product fraction from the manufacture of dimethyl terephthalate, the major portion of said fraction comprising about 15 to 70 weight percent of dimethyl terephthalate, and about 85 to 30 weight percent of a mixture of monomethyl terephthalate, bi-ring esters and polymeric materials. 6. The polyisocyanurate foam of claim 5 wherein said by-product fraction from the manufacture of dimethyl terephthalate comprises a mixture of (a) about 40 to 60 percent by weight of dimethyl terephthalate, (b) about 1 to 10 percent by weight of monomethyl terephthalate, (c) about 1 to 2 percent by weight of terephthalic acid, (d) about 10 to 25 percent by weight of bi-ring esters, (e) about 5 to 12 percent by weight of organic acid salts, (f) about 18 to 25 percent by weight of polymeric materials, and (g) about 1 to 4 percent by weight of ash. 7. The polyisocyanurate foam of claim 1 wherein said aromatic polyester polyol is 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. 8. The polyisocyanurate foam of claim 1 wherein said organic polyisocyanate is a polymethylene polyphenylisocyanate, and said aromatic polyester polyol is a member selected from the group consisting of (a) a polyol mixture prepared by the transesterification, with a glycol of molecular weight from about 60 to 400, of a by-product fraction from the manufacture of dimethyl terephthalate, the major portion of said fraction comprising about 15 to 70 weight percent of dimethyl terephthalate, and about 85 to 30 weight percent of a mixture of monomethyl terephthalate, bi-ring esters and polymeric materials, (b) 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, and (c) mixtures thereof, the equivalent ratio of said organic polyisocyanate to said polyol blend being about 1.5:1 to 6:1, and the weight ratio of said alkylene oxide adduct of an aromatic amine to said aromatic polyester polyol being about 1:9 to 1:1. 9. The polyisocyanurate foam of claim 8 wherein said alkylene oxide adduct of an aromatic amine is an ethylene oxide adduct of toluene diamine isomers of the formula ##STR## wherein the average number of oxyethylene units per polyoxyethylene chain is from 2 to 3. 10. The polyisocyanurate foam of claim 8 wherein (1) said polyol mixture (a) is transesterified with diethylene glycol and is characterized by a viscosity in cps at 25° C. of about 700 to 2500, a free diethylene glycol content of from about 10 to 30 percent by weight of said mixture, a hydroxyl number within a range of from about 350 to 468, and an acid number of about 0.2 to 10, and (2) said polyol mixture (b) is transesterified with diethylene glycol and is characterized by a viscosity in cps at 25° C. of about 1,600 to about 2,800, a free diethylene glycol content of from about 20 to about 30 percent by weight of said mixture, a hydroxyl number within a range of from about 400 to about 490, and an acid number of about 0.2 to about 8. 11. The polyisocyanurate foam of claim 10 wherein said alkylene oxide adduct of an aromatic amine of the blend is an ethylene oxide adduct of toluene diamine isomers of the formula ##STR## wherein the average number of oxyethylene units per polyoxyethylene chain is from 2 to 3. 12. The polyisocyanurate foam of claim 11 wherein the weight ratio of said alkylene oxide adduct of an aromatic amine to said aromatic polyester polyol is about 1:4 to 1:1.5. 13. The polyisocyanurate foam of claim 12 wherein said blowing agent is a fluorocarbon and said trimerization catalyst comprises a mixture of a tertiary amino phenol and an alkali metal carboxylate. 14. The polyisocyanurate foam of claim 13 wherein said trimerization catalyst comprises a mixture of 2,4,6-tris(dimethylaminomethyl)phenol and potassium-2-ethyl hexoate in an equivalent ratio of about 0.4:1 to 2.5:1. 15. A process for producing the polyisocyanurate foam of claim 1 comprising reacting together under foam-forming conditions an organic polyisocyanate, a blowing agent, a trimerization catalyst, and a minor amount of a polyol blend comprising (a) about 5 percent to about 95 percent by weight of said blend of an alkylene oxide adduct of an aromatic amine of the formula ##STR## wherein Z is a divalent aromatic radical, x, x', y, and y' each independently have an average value from about 1 to about 5, and each R is independently selected from the group consisting of hydrogen, alkyl or aryl, provided that the adduct is capped with ethylene oxide units, and (b) about 5 percent to about 95 percent by weight of said blend of an aromatic polyester polyol having a molecular weight of from about 150 to about 5,000. 16. A process for producing a laminate comprising (a) contacting a facing sheet with a polyisocyanurate foam-forming mixture comprising an organic polyisocyanate, a blowing agent, a trimerization catalyst, and a minor amount of a polyol blend comprising (i) about 5 percent to about 95 percent by weight of said blend of an alkylene oxide adduct of an aromatic amine of the formula ##STR## wherein Z is a divalent aromatic radical, x, x', y, and y' each independently have an average value from about 1 to about 5, and each R is independently selected from the group consisting of hydrogen, alkyl or aryl, provided that the adduct is capped with ethylene oxide units, and (ii) about 5 percent to about 95 percent by weight of said blend of an aromatic polyester polyol having a molecular weight of from about 150 to about 5,000, and (b) foaming said foam-forming mixture. 17. A polyol blend comprising (a) about 5 percent to about 95 percent by weight of said blend of an alkylene oxide adduct of an aromatic amine of the formula ##STR## wherein Z is a divalent aromatic radical, x, x', y, and y' each independently have an average value from about 1 to about 5, and each R is independently selected from the group consisting of hydrogen, alkyl or aryl, provided that the adduct is capped with ethylene oxide units, and (b) about 5 percent to about 95 percent by weight of said blend of an aromatic polyester polyol having a molecular weight of from about 150 to about 5,000. 18. The polyisocyanurate foam of claim 2 wherein the weight ratio of said alkylene oxide adduct of an aromatic amine to said aromatic polyester polyol is about 1:9 to 1:1. 19. The polyisocyanurate foam of claim 18 wherein said blowing agent is a halohydrocarbon selected from the group consisting of chlorinated hydrocarbons, fluorinated hydrocarbons and mixtures thereof. 20. The polyisocyanurate foam of claim 19 wherein said trimerization catalyst comprises a mixture of a tertiary amino phenol and an alkali metal carboxylate.