Bis-(N-alkylaminocyclohexyl)methanes as curing agents in polyurethane and polyurea flexible foam manufacture
AssigneeUop LLC
InventorsDavid W. House, Ray V. Scott, Jr., Mark J. Gattuso
Life of this patent
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Abstract
Flexible foam resistant to both photochemical and oxidative degradation result from the use of bis(N-alkylaminocyclohexyl)methanes as curing agents for polyisocyanates or polyisocyanate prepolymers. The chain extenders may be used alone or in combination with other polyamines and with polyols. Where the polyisocyanate or polyisocyanate prepolymer is also aliphatic there is outstanding resistance to yellowing.
Claims18
A polyurethane flexible foam resulting from the reaction of from about 0.85 to about 1.25 equivalents of a polyisocyanate reactant or mixture of polyisocyanate reactants with one equivalent of compounds having isocyanate-reactive hydrogens selected from the group consisting of 1)first polyamines, 2) blends of said first polyamines with polyols, 3) blends of said first polyamines with second polyamines, and 4)blends of said first polyamines with polyols and second polyamines, said first polyamines having the structure ##STR2## where R.sub.1 and R.sub.2 are independently selected from the group consisting of alkyl groups with from 1 up to about 10 carbon atoms, and R.sub.3, R.sub.4, R.sub.5 and R.sub.6 are independently selected from the group consisting of hydrogen and alkyl groups with from 1 up to about 5 carbon atoms, said reaction conducted in the presence of a blowing agent.
A method of making a polyurethane flexible foam comprising reacting from about 0.85 to about 1.25 equivalents of a polyisocyanate reactant or mixture of polyisocyanate reactants with from about 0.2 to about 10 parts water per hundred parts of total polyisocyanate reactants and with one equivalent of compounds having isocyanate-reactive hydrogens selected from the group consisting of 1) first polyarnines, 2) blends of said first polyamines with polyols, 3) blends of said first polyamines with second polyamines, and 4)blends of said first polyamines with polyols and second polyamines, said first polyamines having the structure ##STR3## where R.sub.1 and R.sub.2 are independently selected from the group consisting of alkyl groups with from 1 up to about 10 carbon atoms, and R.sub.3, R.sub.4, R.sub.5 and R.sub.6 are independently selected from the group consisting of hydrogen and alkyl groups with from 1 up to about 5 carbon atoms, said reaction conducted in the presence of a blowing agent.
Dependencies are inferred from the claim text.