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AssigneeUop LLC
InventorsDavid W. House, Ray V. Scott, Jr., William M. Baumann
Estimating the term…
Partially alkylated polyamines which may be viewed as low molecular weight polymers of x-amino-y-methylenephenyl are effective curing agents in combination with other polyamines and polyols in reaction injection molding for diverse class of polyisocyanates. Alkylation may range from 5 up to 100 percent to afford polyamines with a board spectrum of cure times, as well as to give elastomers with an interesting and useful diversity of properties. Such polyamines may be used as a constituent in a blend of polyamines as the isocyanate-reactive component, in which case the elastomer may be viewed as predominantly a polyurea, or as a constituent in a blend with polyols, in which case the elastomer may be viewed as an elastomer with both urethane and urea segments.
A reaction injection molded elastomer made by reacting in a closed mold a first stream comprising one or more polyisocyanates with a second stream comprising from about 0.7 to about 1.3 equivalents of a blend of compounds having isocyanate reactive hydrogens said blend consisting essentially of a backbone polyamine (B.sub.A) or a backbone polyol (B.sub.o) and a chain extender polyamine (P) which is at least one alkylated aromatic polyamine of the structure, ##STR3## where R.sub.1, R.sub.2, and R.sub.3 are independently from the group consisting of hydrogen or an alkyl or alkenyl moiety containing from 1 to about 20 carbon atoms, where n is an integer from 1 to 10, and where the number average of said R groups different from hydrogen is between about 5 and about 67 percent of (n+2), and where the chain extender polyamine constitutes from about 20 to about 80 equivalents percent of the blend.
A reaction injection molded elastomer made by reacting in a closed mold a first stream comprising one or more polyisocyanates with a second stream comprising from about 0.7 to about 1.3 equivalents of a blend of compounds having isocyanate reactive hydrogens said blend consisting essentially of a backbone polyamine (B.sub.A) or a backbone polyol (B.sub.o) and a first chain extender polyamine (P) which is at least one alkylated aromatic polyamine of the structure, ##STR4## where R.sub.1, R.sub.2, and R.sub.3 are independently selected from the group consisting of hydrogen or an alkyl or alkenyl moiety containing from 1 to about 20 carbon atoms, where n is an integer from 1 to about 10, and where the number average of said R groups different from hydrogen is between about 5 and about 67 percent of (n+2), along with a second chain extender amine selected from the group consisting of 1-methyl-3,5-diethyl-2,4-diaminobenzene, 1-methyl-3,5-diethyl-2,6-diaminobenzene, toluene diamine, 1,3,5-triethyl-2,6-diaminobenzene, 3,3'-dichloro-4,4'-diaminodiphenylmethane where the second chain extender polyamine constitutes from about 80 to about 99% equivalents percent of the mixture of chain extender polyamines and the mixture of first and second chain extender polyamines constitutes from about 20 to about 80 equivalents percent of the blend.
A reaction injection molded elastomer made by reacting in a closed mold a first stream comprising one or more polyisocyanates with a second stream comprising from about 0.7 to about 1.3 equivalents of a blend of compounds having isocyanates reactive hydrogens said blend consisting essentially of a backbone polyamine (B.sub.A) or a backbone polyol (B.sub.o) and a mixture of chain extenders consisting essentially as a first component a chain extender polyamine (P) which is at least one alkylated aromatic polyamine of the structure, ##STR5## where R.sub.1, R.sub.2, and R.sub.3 are independently selected from the group consisting of hydrogen or an alkyl or alkenyl moiety containing from 1 to about 20 carbon atoms, where n is an integer from one to about 10, and where the number average of said R groups different from hydrogen is between about 5 and about 67 percent of (n+2), and as a second component a chain extender polyol, where from about 20 to about 50 percent of the mixture of chain extenders is said chain extender polyol, and where the mixture of chain extenders constitutes from about 20 to about 80 equivalents percent of the blend.
Dependencies are inferred from the claim text.