초록 ▼

Improved methods are provided for incorporating carbon dioxide and carbon dioxide generating compounds into polyurethane foam forming compositions as blowing agents to eliminate or reduce the amount of low boiling liquid auxiliary blowing agents, such as methylene chloride and chlorofluorocarbons co

Improved methods are provided for incorporating carbon dioxide and carbon dioxide generating compounds into polyurethane foam forming compositions as blowing agents to eliminate or reduce the amount of low boiling liquid auxiliary blowing agents, such as methylene chloride and chlorofluorocarbons conventionally used in the manufacture of urethane foams.

대표청구항 ▼

In the method for the continuous manufacture of flexible free rise polyurethane foam from reactants comprising at least one polyol and at least one reactive isocyanate where the reaction mixture includes water as a blowing agent and CO2 is incorporated into one of the liquid reactants, or into a ble

In the method for the continuous manufacture of flexible free rise polyurethane foam from reactants comprising at least one polyol and at least one reactive isocyanate where the reaction mixture includes water as a blowing agent and CO2 is incorporated into one of the liquid reactants, or into a blend of one or more of the liquid reactants, and the reactants are introduced under pressure through feed lines into a conventional mixer through two or more feed streams, and the reacting mixture is discharged from the mixer, the improvement which comprises: injecting gaseous CO2 under pressure into the feed stream of one or more of the liquid reactants of the foam forming composition at a distance from the mixer which will maximize the dissolution of CO2 in the feed stream.