GB918868A - Polyurethane foams - Google Patents

Abstract

A process for the production of polyurethane plastics comprises reacting an organic polyisocyanate and a phosphorus compound of the formula P[O(RO)nH]3 or O=P[O(RO)nH]3 or <FORM:0918868/IV(a)/1> wherein R is an alkylene radical and n is an integer between 2 and 35. The phosphorus compounds can be prepared by alkoxylation of phosphoric or phosphorus acids or esterification of the acids with polyhydric polyalkylene ethers. Hydroxyl-containing polyesters or polythioethers may be mixed with the polyalkylene ethers for esterification with the phosphorus compounds. Cellular products can be obtained by using the phosphates or phosphites as the active hydrogen-containing compounds in a process similar to that of Specification 769,680. Foaming can also be effected by including halohydrocarbons in the reaction mixture. The phosphorus compounds may be mixed with a hydroxyl group-containing polyester or polyether before conversion to the foam. Non-porous polyurethanes can be obtained by substituting the phosphate or phosphite esters for the hydroxyl polyesters in the process described in Specification 700,608. Tri(chlorethyl) phosphate can be included in the reaction mixture to impart flame resistance. Coating compositions are obtained by mixing the phosphorus-containing polyether with a polyisocyanate in a solvent such as diethylene glycol diethyl ether, benzene, toluene or xylene. In examples (1) propylene oxide is reacted with phosphoric acid and phosphorus pentoxide to give a polyether as an oil of OH number 400. This is converted to a foam by reaction with permethylated aminoethyl piperazine, water, a modified polysiloxane and toluylene diisocyanate; (3) a polyester from phthalic and adipic acids, oleic acid and trimethylol propane and (4) a trimethylol propane/propylene oxide reaction product is included in the reaction mixture in a similar process; (9) a tris(hydroxyalkylene polyether) phosphite from phosphorus trichloride and polypropylene glycol is similarly reacted. Specification 804,369 also is referred to.ALSO:A process for the production of polyurethane plastics comprises reacting an organic polyisocyanate and a phosphorus compound of the formula P[O (RO)nH]3 or O = P[O (RO)nH]3 or <FORM:0918868/V/1> wherein R is an alkylene radical and n is an integer between 2 and 35. The phosphorus compounds can be prepared by alkoxylation of phosphoric or phosphorous acids or esterification of the acids with polyhydric polyalkylene ethers. Hydroxyl-containing polyesters or polythio-ethers may be mixed with the polyalkylene ethers for esterification with the phosphorus compounds. Cellular products can be obtained by using the phosphates or phosphites as the active hydrogen-containing compounds in a process similar to that of Specification 769,680. Foaming can also be effected by including halohydro-carbons in the reaction mixture. The phosphorus compound may be mixed with a hydroxyl group-containing polyester or polyether before conversion of the foam. Non porous polyurethanes can be obtained by substituting the phosphate or phosphite esters for the hydroxyl polyesters in the process described in Specification 700,608. Tri (chlorethyl) phosphate can be included in the reaction mixture to impart flame resistance. Coating compositions are obtained by mixing the phosphorus containing polyether with a polyisocyanate in a solvent such as diethylene glycol diethyl ether, benzene, toluene or xylene. In examples (1) propylene oxide is reacted with phosphoric acid and phosphorus pentoxide to give a polyether as an oil of OH number 400. This is converted to a foam by reaction with permethylated aminoethyl piperzaine, water, a modified polysiloxane and toluylene diisocyanate; (3) a polyester from phthalic and adipic acids, oleic acid and trimethylol propane, and (4) a trimethylol propane/propylene oxide reaction product is included in the reaction mixture in a similar process; (9) a tris (hydroxy alkylene polyether) phosphite from phosphorus trichloride and polypropylene glycol is similarly reacted. Specification 804,369 also is referred to.