Polyurethane foam material free of halogenated hydrocarbons and process for producing the same
First Claim
1. Polyurethane insulating foam material comprising a catalyst, a pore stabilizing agent and/or a flame retardant, wherein the pores are free from halogenated hydrocarbons and contain minor amounts of a foaming agent used in the production of the foam material and selected from the group consisting of a lower alkane containing 3 to 6 carbon atoms and the mixtures of several of such lower alkanes, said foaming agent having a boiling point at normal pressure between -10°
- and +70°
C., and wherein said flame retardant is selected from the group consisting of the liquid and the solid flame retardants, said flame retardant or flame retardants being present in the foam material in an amount of 5 to 35 percent by weight based upon the total weight of the final foam material.
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Abstract
The present invention is related to polyurethane foam materials, pores thereof being free of halogenated hydrocarbon compounds, in particular free of CFCs, and a process for producing the same wherein no halogenated hydrocarbon, in particular no CFC is used as foaming agent. The pores of the polyurethane foam material contain minor amounts of the vaporized foaming agent used in the process of the invention, i.e. of the organic liquid product selected from the group consisting of a lower alkane having 3 to 6 carbon atoms or a mixture of such lower alkanes, said liquid foaming agent having a boiling point between -10° and =70° C. at normal pressure. In the process of the present invention said foaming agent is either finely dispersed in the mixture of the alcoholic starting component and the isocyanate starting component or said foaming agent is first emulsified in the alcoholic starting component, if necessary with the aid of an emulsifying agent, and the isocyanate component thereafter is added to this emulsion, and then the exothermic polymerization reation of the starting components is effected. Possibly, the so produced polyurethane foam material is stored for several hours or days.
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Citations
28 Claims
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1. Polyurethane insulating foam material comprising a catalyst, a pore stabilizing agent and/or a flame retardant, wherein the pores are free from halogenated hydrocarbons and contain minor amounts of a foaming agent used in the production of the foam material and selected from the group consisting of a lower alkane containing 3 to 6 carbon atoms and the mixtures of several of such lower alkanes, said foaming agent having a boiling point at normal pressure between -10°
- and +70°
C., and wherein said flame retardant is selected from the group consisting of the liquid and the solid flame retardants, said flame retardant or flame retardants being present in the foam material in an amount of 5 to 35 percent by weight based upon the total weight of the final foam material. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
- and +70°
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12. Process for producing the polyurethane insulating foam material, comprising the steps of
adding to an alcoholic starting component for PUR foam material other additives selected from the group consisting of flame retardants, catalysts and pore stabilizers, admixing and emulsifying in the alcoholic starting component a non-halogenated organic liquid product selected from the group consisting of the lower alkanes having 3 to 6 carbon atoms and the mixture of several such lower alkanes, said lower alkane or mixture of several lower alkanes having a boiling point between -10° - and +70°
C. at normal pressure,adding to said emulsified mixture the isocyanate starting component in proportions as usual for the alcoholic starting component and the isocyanate starting component in PUR foaming materials, and thereafter effecting the polymerization of the starting components for the PUR foam material to be produced under usual conditions. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
- and +70°
Specification