Classifications

• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C211/00—Compounds containing amino groups bound to a carbon skeleton
  • C07C211/01—Compounds containing amino groups bound to a carbon skeleton having amino groups bound to acyclic carbon atoms
  • C07C211/02—Compounds containing amino groups bound to a carbon skeleton having amino groups bound to acyclic carbon atoms of an acyclic saturated carbon skeleton
  • C07C211/09—Diamines
  • C07C211/12—1,6-Diaminohexanes
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C211/00—Compounds containing amino groups bound to a carbon skeleton
  • C07C211/43—Compounds containing amino groups bound to a carbon skeleton having amino groups bound to carbon atoms of six-membered aromatic rings of the carbon skeleton
  • C07C211/44—Compounds containing amino groups bound to a carbon skeleton having amino groups bound to carbon atoms of six-membered aromatic rings of the carbon skeleton having amino groups bound to only one six-membered aromatic ring
  • C07C211/49—Compounds containing amino groups bound to a carbon skeleton having amino groups bound to carbon atoms of six-membered aromatic rings of the carbon skeleton having amino groups bound to only one six-membered aromatic ring having at least two amino groups bound to the carbon skeleton
  • C07C211/50—Compounds containing amino groups bound to a carbon skeleton having amino groups bound to carbon atoms of six-membered aromatic rings of the carbon skeleton having amino groups bound to only one six-membered aromatic ring having at least two amino groups bound to the carbon skeleton with at least two amino groups bound to carbon atoms of six-membered aromatic rings of the carbon skeleton
  • C07C211/51—Phenylenediamines
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  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G18/00—Polymeric products of isocyanates or isothiocyanates
  • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
  • C08G18/08—Processes
  • C08G18/10—Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G18/00—Polymeric products of isocyanates or isothiocyanates
  • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
  • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
  • C08G18/30—Low-molecular-weight compounds
  • C08G18/32—Polyhydroxy compounds; Polyamines; Hydroxyamines
  • C08G18/3225—Polyamines
  • C08G18/3234—Polyamines cycloaliphatic
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G18/00—Polymeric products of isocyanates or isothiocyanates
  • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
  • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
  • C08G18/30—Low-molecular-weight compounds
  • C08G18/32—Polyhydroxy compounds; Polyamines; Hydroxyamines
  • C08G18/3225—Polyamines
  • C08G18/3237—Polyamines aromatic
  • C08G18/324—Polyamines aromatic containing only one aromatic ring
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G18/00—Polymeric products of isocyanates or isothiocyanates
  • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
  • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
  • C08G18/30—Low-molecular-weight compounds
  • C08G18/32—Polyhydroxy compounds; Polyamines; Hydroxyamines
  • C08G18/3225—Polyamines
  • C08G18/325—Polyamines containing secondary or tertiary amino groups
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  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G18/00—Polymeric products of isocyanates or isothiocyanates
  • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
  • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
  • C08G18/40—High-molecular-weight compounds
  • C08G18/48—Polyethers
  • C08G18/50—Polyethers having heteroatoms other than oxygen
  • C08G18/5021—Polyethers having heteroatoms other than oxygen having nitrogen
  • C08G18/5024—Polyethers having heteroatoms other than oxygen having nitrogen containing primary and/or secondary amino groups
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G18/00—Polymeric products of isocyanates or isothiocyanates
  • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
  • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
  • C08G18/65—Low-molecular-weight compounds having active hydrogen with high-molecular-weight compounds having active hydrogen
  • C08G18/66—Compounds of groups C08G18/42, C08G18/48, or C08G18/52
  • C08G18/6666—Compounds of group C08G18/48 or C08G18/52
  • C08G18/667—Compounds of group C08G18/48 or C08G18/52 with compounds of group C08G18/32 or polyamines of C08G18/38
  • C08G18/6681—Compounds of group C08G18/48 or C08G18/52 with compounds of group C08G18/32 or polyamines of C08G18/38 with compounds of group C08G18/32 or C08G18/3271 and/or polyamines of C08G18/38
  • C08G18/6685—Compounds of group C08G18/48 or C08G18/52 with compounds of group C08G18/32 or polyamines of C08G18/38 with compounds of group C08G18/32 or C08G18/3271 and/or polyamines of C08G18/38 with compounds of group C08G18/3225 or polyamines of C08G18/38
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G18/00—Polymeric products of isocyanates or isothiocyanates
  • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
  • C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
  • C08G18/72—Polyisocyanates or polyisothiocyanates
  • C08G18/74—Polyisocyanates or polyisothiocyanates cyclic
  • C08G18/76—Polyisocyanates or polyisothiocyanates cyclic aromatic
  • C08G18/7657—Polyisocyanates or polyisothiocyanates cyclic aromatic containing two or more aromatic rings
  • C08G18/7664—Polyisocyanates or polyisothiocyanates cyclic aromatic containing two or more aromatic rings containing alkylene polyphenyl groups
  • C08G18/7671—Polyisocyanates or polyisothiocyanates cyclic aromatic containing two or more aromatic rings containing alkylene polyphenyl groups containing only one alkylene bisphenyl group
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
  • Y02P20/00—Technologies relating to chemical industry
  • Y02P20/50—Improvements relating to the production of bulk chemicals
  • Y02P20/582—Recycling of unreacted starting or intermediate materials

Definitions

• This invention relates to the preparation of diimines and secondary diamines from primary diamines, and to new aromatic diimines and new aromatic secondary diamines.
• Imines are often formed from combination of a primary amine and an aldehyde or ketone. Such imines can be used as flavors (see U.S. 3,625,710) or fragrances (see EP 1067116).
• aromatic diimines having groups with two or more carbon atoms from aromatic primary diamines where the two amino groups are either on one phenyl ring, or one amino group is on each of two phenyl rings, where the two phenyl rings are connected via an alkylene bridge, and in which each position ortho (immediately adjacent) to each amino group bears a hydrocarbyl substituent.
• Attempts to prepare diimines via reaction of such primary diamines with acetaldehyde or acetone in the presence or absence of catalysts have not worked; see U.S. Pat.Nos. 5,041,668 and5,008,453.
• diimines of type (a) could not be made. These aromatic diimines, which surprisingly can be made, are compositions of the invention. Aromatic secondary diamines made from aromatic diimines of type (a) are also compositions of the invention. Surprisingly, such aromatic secondary diamines exhibit slower curing rates than those of presently available chain extenders. Slower cure rates are desirable for certain proprietary commercial applications. By hydrogenating (reducing) aromatic diimines of type (a), the corresponding novel aromatic secondary diamines of the invention are formed. Processes for forming secondary diamines, including the aromatic secondary diamines that are compositions of the invention, from primary diamines in one step are also provided by this invention.
• One embodiment of this invention provides, as new compositions of matter, aromatic diimines wherein the diimine either is in the form of one benzene ring having two imino groups on the ring, which imino groups are meta or para relative to each other, and in which each position ortho to an imino group bears a hydrocarbyl group, or is in the form of two benzene rings connected by an alkylene bridge and having one imino group on each ring, wherein each position ortho to an imino group bears a hydrocarbyl group, and wherein each imino hydrocarbylidene group has at least two carbon atoms.
• the aromatic diimines of the invention can be represented by the structures:
• each R a may be the same or different, and each R a is a hydrocarbyl group, R b is an alkylene bridge, and each R c is a hydrocarbylidene group having at least two carbon atoms.
• Another embodiment of this invention provides, as new compositions of matter, aromatic secondary diamines where the secondary diamine either is in the form of one benzene ring having two secondary amino groups on the ring, which secondary amino groups are meta or para relative to each other, and in which each position ortho to a secondary amino group bears a hydrocarbyl group, or is in the form of two benzene rings connected by an alkylene bridge and having one secondary amino group on each ring, wherein each position ortho to a secondary amino group bears a hydrocarbyl group, and wherein each amino hydrocarbyl group has at least two carbon atoms.
• the aromatic secondary diamines of the invention can be represented by the structures:
• each R a may be the same or different, and each R a is a hydrocarbyl group, R b is an alkylene bridge, and each R d is a hydrocarbyl group having at least two carbon atoms.
• Another embodiment of this invention is a process for forming a secondary diamine. The process comprises mixing together at least one ketone or aldehyde, at least one acid ion exchange resin, at least one hydrogenation agent, and at least one primary diamine, such that a secondary diamine is formed.
• the primary diamine is I) an aromatic primary diamine which is either in the form of one benzene ring having two primary amino groups on the ring or in the form of two benzene rings connected by an alkylene bridge and having one primary amino group on each ring, wherein at least one position ortho to each primary amino group has a hydrogen atom as a substituent, or II) an aromatic primary diamine which is either in the form of one benzene ring having two primary amino groups on the ring, which primary amino groups are meta or para relative to each other or is in the form of two benzene rings connected by an alkylene bridge and having one primary amino group on each ring, wherein each position ortho to a primary amino group bears a hydrocarbyl group, or III) an aliphatic primary diamine.
• the hydrogenation agent is a hydride transfer agent, a dissolving metal reagent, a borane reductant, or hydrogen with a hydrogenation catalyst, where the hydrogenation catalyst is sulfided platinum on carbon, sulfided palladium on carbon, or a mixture thereof.
• the hydrogenation agent is a dissolving metal reagent or hydrogen with a hydrogenation catalyst, where the hydrogenation catalyst is sulfided platinum on carbon, sulfided palladium on carbon, or a mixture thereof, or is selected from the group consisting of palladium on carbon, platinum on carbon, and a mixture of both of these, when used with hydrogen sulfide or at least one strong acid.
• the hydrogenation agent is a hydride transfer agent, a dissolving metal reagent, a borane reductant, or hydrogen with a hydrogenation catalyst, where the hydrogenation catalyst is sulfided platinum on carbon, sulfided palladium on carbon, or a mixture thereof.
• Still another embodiment of this invention is a process for forming a diimine.
• the process comprises mixing together at least one ketone or aldehyde, at least one acid ion exchange resin, and at least one primary diamine, such that a diimine is formed.
• the primary diamine is I) an aromatic primary diamine which is either in the form of one benzene ring having two primary amino groups on the ring or in the form of two benzene rings connected by an alkylene bridge and having one primary amino group on each ring, wherein at least one position ortho to each primary amino group has a hydrogen atom as a substituent, or II) an aromatic primary diamine which is either in the form of one benzene ring having two primary amino groups on the ring, which primary amino groups are meta or para relative to each other or is in the form of two benzene rings connected by an alkylene bridge and having one primary amino group on each ring, wherein each position ortho to a primary amino group bears a hydrocarbyl group, or III) an aliphatic primary diamine.
• this process further comprises mixing together at least a portion of the diimine and a hydrogenation agent.
• the hydrogenation agent is a hydride transfer agent, a dissolving metal reagent, a borane reductant, or hydrogen with a hydrogenation catalyst, wherein the hydrogenation catalyst is sulfided platinum on carbon, sulfided palladium on carbon or a mixture thereof.
• the hydrogenation agent is a dissolving metal reagent or hydrogen with a hydrogenation catalyst, where the hydrogenation catalyst is sulfided platinum on carbon, sulfided palladium on carbon, or a mixture thereof, or is selected from the group consisting of palladium on carbon, platinum on carbon, and a mixture of both of these, when used with hydrogen sulfide or at least one strong acid, such that a secondary diamine is formed.
• Another embodiment of this invention is a process for forming an aromatic secondary diamine.
• the process comprises mixing together at least one ketone or aldehyde, hydrogen, a hydrogenation catalyst selected from sulfided platinum on carbon, sulfided palladium on carbon, and a mixture thereof, and at least one primary diamine, such that a secondary diamine is formed.
• the process is conducted at a temperature in the range of about 20 0 C to about 120 0 C and at a hydrogen pressure in the range of about 14 to about 125 pounds per square inch.
• the primary diamine is II) an aromatic primary diamine which is either in the form of one benzene ring having two primary amino groups on the ring, which primary amino groups are meta or para relative to each other or is in the form of two benzene rings connected by an alkylene bridge and having one primary amino group on each ring, wherein each position ortho to a primary amino group bears a hydrocarbyl group
• the process is conducted at a temperature in the range of about 75°C to about 140 0 C and at a hydrogen pressure in the range of about 14 to about 150 pounds per square inch.
• the primary diamine is III) an aliphatic primary diamine, the process is conducted at a temperature in the range of about 20 0 C to about 140 0 C and at a hydrogen pressure in the range of about 14 to about 150 pounds per square inch.
• a further embodiment of the invention is a formulation which is formed from ingredients comprising at least one polyol and/or at least one polyetheramine, at least one isocyanate, and at least one aromatic secondary diamine.
• the aromatic secondary diamine is at least one of the aromatic secondary diamines described above as new compositions of matter.
• a still further embodiment of the invention is a method for producing a polyurethane, polyurea, or polyurea-urethane.
• the method comprises blending at least one polyol and/or at least one polyetheramine, at least one isocyanate, and at least one aromatic secondary diamine.
• the aromatic secondary diamine is at least one of the aromatic secondary diamines described above as new compositions of matter.
• Imines that are products of a reaction of a primary amine and a carbonyl compound are sometimes called Schiff bases, and such imines are formed by at least some of the processes of the invention.
• the carbonyl compound used to form the imine is a ketone, such an imine is occasionally referred to as a ketimine; similarly, when the carbonyl compound used to form the imine is an aldehyde, such an imine is occasionally referred to as an aldimine.
• reductive alkylation The formation of a secondary amine from a primary amine and an aldehyde or ketone is often referred to as reductive alkylation or reductive amination, and the terms “reductive alkylation” and “reductive amination” can be used to describe some of the processes of the invention.
• second diamine is used throughout this document to refer to diamines produced by the processes of this invention in which both amino groups are secondary, it is to be understood that the processes of this invention produce diamines in which only one of the amino groups is secondary (and the other amino group is primary), albeit usually in small amounts, because the processes of the invention do not necessarily produce diamine(s) where both amino groups are secondary in 100% yield.
• aromatic secondary diamine is used to refer to compositions of the invention, it does not generally include aromatic diamines in which one amino group is secondary and the other amino group is primary, except as impurities present (usually in small amounts) in the aromatic secondary diamines.
• hydrocarbyl groups on the benzene rings may be the same or different.
• suitable hydrocarbyl groups on the aromatic ring include methyl, ethyl, propyl, isopropyl, n-butyl, sec-butyl, t-butyl, pentyl, cyclopentyl, hexyl, methylcyclohexyl, heptyl, octyl, cyclooctyl, nonyl, decyl, dodecyl, phenyl, benzyl, and the like.
• the alkylene bridge is considered as a hydrocarbyl group ortho to the imino group.
• Preferred hydrocarbyl groups on the benzene ring(s) (ortho to an imino group) of the aromatic diimines are straight-chain or branched-chain alkyl groups having from one to about six carbon atoms; particularly preferred hydrocarbyl groups are methyl, ethyl, isopropyl, butyl, and mixtures of two or more of these groups.
• butyl groups includes n-butyl, sec-butyl, and t-butyl groups.
• the alkylene bridge of the two-ringed diimine has from one to about six carbon atoms; preferably, the bridge has from one to about three carbon atoms. More preferably, the alkylene bridge has one or two carbon atoms; highly preferred is an alkylene bridge having one carbon atom, / ' . e. , a methylene group.
• the hydrocarbylidene groups of the imino groups of the aromatic diimine generally have from two to about twenty carbon atoms; the hydrocarbylidene groups may be aliphatic (straight chain, branched, or cyclic) or aromatic.
• the imino hydrocarbylidene groups are straight chain or branched chain alkylidene groups having from three to about six carbon atoms.
• imino hydrocarbylidene groups include ethylidene, propylidene, isopropylidene, 1 -cyclopropylethylidene, n-butylidene, sec-butylidene, cyclobutylidene, 2-ethylbutylidene, 3,3-dimethyl-2-butylidene, 3-pentylidene, 3-penten-2- ylidene, cyclopentylidene, 2,5-dimethylcyclopentylidene, 2-cyclopentenylidene, hexylidene, methylcyclohexylidene, menthylidene, ionylidene, phorylidene, isophorylidene, heptylidene, 2,6,-dimethyl-3-heptylidene, cyclooctylidene, 5-nonylidene, decylidene, 10-undecen
• imino hydrocarbylidene groups are isopropylidene and sec-butylidene.
• Aromatic diimines having two imino groups on one benzene ring preferably have the imino groups meta relative to each other.
• the imino hydrocarbylidene group preferably is a straight chain or branched chain alkylidene group having from three to about six carbon atoms.
• aromatic diimines in which the hydrocarbyl group between the two meta imino groups is a methyl group, while the two remaining hydrocarbyl groups are ethyl groups, and those in which the hydrocarbyl group between the two meta imino groups is an ethyl group, while one of the two remaining hydrocarbyl groups is a methyl group and the other is an ethyl group, and mixtures thereof, especially when the imino hydrocarbylidene groups are isopropylidene or sec-butylidene.
• Preferred aromatic diimines in which one imino group is on each of two benzene rings, where the two benzene rings are connected via an alkylene bridge have both imino groups para relative to the alkylene bridge.
• a particularly preferred aromatic diimine of this type is a compound where each hydrocarbyl group ortho to an imino group is an ethyl group and the alkylene bridge is a methylene group; this is especially preferred when the imino hydrocarbylidene groups are isopropylidene or sec-butylidene.
• Diimines of the invention having both imino groups on one benzene ring include, but are not limited to, N,N'-diisopropylidene-2,4,6-triethyl- 1 ,3-benzenediamine, N,N'-di-sec- butylidene-2,4,6-triethyl-l,3-benzenediamine, N,N'-di(2-pentylidene)-(2,4,6-triethyl-l,3- benzenediamine), N,N'-diisopropylidene-(2,4-diethyl-6-methyl-l ,3-benzenediamine), N,N'-di- sec-butylidene-(2,4-diethyl-6-methyl- 1 ,3-benzenediamine), N,N'-diisopropylidene-(4,6- diethyl-2-methyl-l,3-benzenediamine), N,N''-d
• aromatic diimines having both imino groups on one benzene ring are N,N'-diisopropylidene-(2,4- diethyl-6-methyl- 1,3 -benzenediamine), N,N'-diisopropylidene-(4,6-diethyl-2-methyl-l,3- benzenediamine), and mixtures thereof; N,N'-di-sec-butylidene-(2,4-diethyl-6-methyl-l,3- benzenediamine), N,N'-di-sec-butylidene-(4,6-diethyl-2-methyl- 1 ,3-benzenediamine), and mixtures thereof.
• aromatic diimines of the invention in which one imino group is on each of two benzene rings include N,N'-diisopropylidene-2,2'-methylenebis(6-n- propylbenzeneamine), N,N'-di-sec-butylidene-2,2'-methylenebis(6-n-propylbenzeneamine), N,N'-di-sec-butylidene-2,2'-methylenebis(3,6-di-n-propylbenzeneamine), N,N'-di(l - cyclobutylethylidene)-2,2'-niethylenebis(5,6-dihexylbenzeneaniine),N,N'-diisopropylidene- 3 ,3 '-methylenebis(2,6-di-n-butylbenzeneamine), N,N'-di(2,4-dimethyl-3 -pentylidene
• aromatic diimines in which one imino group is on each of two benzene rings are N,N'-diisopropylidene-4,4'- methylenebis(2,6-diethylbenzeneamine) and N,N'-di-sec-butylidene-4,4'-methylenebis(2,6- diethylbenzeneamine) .
• An aromatic secondary diamine which is a composition of the invention is a secondary diamine in which each amino hydrocarbyl group has at least two carbon atoms, and which secondary diamine either is in the form of one benzene ring having two secondary amino groups on the ring, which secondary amino groups are meta or para relative to each other, and in which each position ortho (immediately adjacent) to a secondary amino group (-NHR) bears a hydrocarbyl group, or is in the form of two benzene rings connected by an alkylene bridge and having one secondary amino group on each ring, and in which each position ortho (immediately adjacent) to a secondary amino group bears a hydrocarbyl group.
• hydrocarbyl groups ortho to the secondary amino groups on the benzene rings may be the same or different.
• suitable hydrocarbyl groups on the benzene ring include methyl, ethyl, propyl, isopropyl, n-butyl, sec-butyl, t-butyl, pentyl, cyclopentyl, hexyl, methylcyclohexyl, heptyl, octyl, cyclooctyl, nonyl, decyl, dodecyl, phenyl, benzyl, and the like.
• the alkylene bridge is considered as a hydrocarbyl group ortho to the secondary amino group.
• Preferred hydrocarbyl groups on the benzene rings (ortho to a secondary amino group) of the aromatic secondary diamines are straight chain or branched chain alkyl groups having from one to about six carbon atoms; particularly preferred hydrocarbyl groups are methyl, ethyl, isopropyl, butyl, and mixtures of two or more of these groups.
• butyl groups includes n-butyl, sec-butyl, and t-butyl groups.
• the alkylene bridge of the two-benzene-ring secondary diamine has from one to about six carbon atoms; preferably, the alkylene bridge has from one to about three carbon atoms. More preferably, the alkylene bridge has one or two carbon atoms; highly preferred is an alkylene bridge having one carbon atom, i. e. , a methylene group.
• Particularly preferred amino hydrocarbyl groups are isopropyl and sec-butyl groups.
• amino hydrocarbyl group refers to the hydrocarbyl group bound to a nitrogen atom of the aromatic secondary diamine which hydrocarbyl group is not the benzene ring to which the nitrogen atom is bound in order to form the aromatic secondary diamine.
• the amino hydrocarbyl groups of the aromatic secondary diamine generally have from two to about twenty carbon atoms; the amino hydrocarbyl group may be aliphatic (straight chain, branched, or cyclic) or aromatic.
• the amino hydrocarbyl groups are straight chain or branched chain alkyl groups having from three to about six carbon atoms.
• suitable amino hydrocarbyl groups include ethyl, propyl, isopropyl, 1- cyclopropylethyl, n-butyl, sec-butyl, cyclobutyl, 2-ethylbutyl, 3,3-dimethyl-2-butyl, 3-pentyl, 3-penten-2-yl, cyclopentyl, 2,5-dimethylcyclopentyl, 2-cyclopentenyl, hexyl, methylcyclohexyl, menthyl, ionyl, phoryl, isophoryl, heptyl, 2,6,-dimethyl-3-heptyl, cyclooctyl, 5-nonyl, decyl, 10-undecenyl, dodecyl, benzyl, 2,4-dimethylbenzyl, 2-phenylethyl, 1-phenylpentyl, 1-naphthyl, 2-naphthyl,
• Aromatic secondary diamines with two secondary amino groups on one benzene ring preferably have the secondary amino groups meta relative to each other.
• the amino hydrocarbyl group preferably is a straight chain or branched chain alkyl group having from three to about six carbon atoms.
• aromatic secondary diamines in which the hydrocarbyl group between the two meta secondary amino groups is a methyl group, while the two remaining hydrocarbyl groups are ethyl groups, and those in which the hydrocarbyl group between the two meta secondary amino groups is an ethyl group, while one of the two remaining hydrocarbyl groups is a methyl group and the other is an ethyl group, and mixtures thereof, especially when the amino hydrocarbyl groups are isopropyl or sec-butyl groups.
• Preferred aromatic secondary diamines in which one secondary amino group is on each of two benzene rings, where the two benzene rings are connected via an alkylene bridge have both secondary amino groups para relative to the alkylene bridge.
• a particularly preferred aromatic secondary diamine of this type is a compound where each hydrocarbyl group ortho to a secondary amino group is an ethyl group and the alkylene bridge is a methylene group; this is especially preferred when the amino hydrocarbyl groups are isopropyl or sec-butyl groups.
• Aromatic secondary diamines of this invention having both secondary amino groups on one benzene ring include, but are not limited to, N,N'-diisopropyl-2,4,6-triethyl-l,3- benzenediamine, N,N'-di-sec-butyl-2,4,6-triethyl- 1 ,3-benzenediamine, N,N'-di-2-pentyl-2,4,6- triethyl-l,3-benzenediamine, N,N'-diisopropyl-(2,4-diethyl-6-methyl-l,3-benzenediamine), N,N'-di-sec-butyl-(2,4-diethyl-6-methyl- 1 ,3-benzenediamine), N,N'-diisopropyl-(4,6-diethyl- 2-methyl- 1 ,3-benzenediamine), N,N'-di-sec-butyl-(4,
• aromatic diamines having both amino groups on one benzene ring are N,N'- diisopropyl-(2,4-diethyl-6-methyl- 1 ,3-benzenediamine), N,N'-diisopropyl-(4,6-diethyl-2- methyl- 1 ,3-benzenediamine), and mixtures thereof; N,N'-di-sec-butyl-(2,4-diethyl-6-methyl- 1,3 -benzenediamine), N,N'-di-sec-butyl-(4,6-diethyl-2-methyl- 1,3 -benzenediamine), and mixtures thereof.
• aromatic secondary diamines of the invention in which one secondary amino group is on each of two benzene rings include N,N'-diisopropyl-2,2'-methylenebis(6-n- propylbenzeneamine), N,N'-di-sec-butyl-2,2'-methylenebis(3,6-di-n-propylbenzeneamine), N,N'-di(2,4-dimethylbenzyl)-2,2'-methylenebis(5,6-dihexylbenzeneamine),N,N'-diisopropyl- 3,3'-methylenebis(2,6-di-n-butylbenzeneamine), N,N'-di(2,4-dimethyl-3-pentyl)-3,3'- methylenebis(2,6-di-n-butylbenzeneamine), N,N'-diisopropyl-4,4'-methylenebis(2,6-diethyl
• aromatic diamines in which one amino group is on each of two benzene rings are N,N'-diisopropyl-4,4'-methylenebis(2,6-diethylbenzeneamine) and N,N'-di-sec-butyl-4,4'- methylenebis(2,6-diethylbenzeneamine).
• hydrocarbyl ketones and hydrocarbyl aldehydes are used.
• the hydrocarbyl portion of the ketone or aldehyde may be aliphatic (cyclic, branched, or straight chain), unsaturated, aromatic, or alkylaromatic.
• the hydrocarbyl portion is preferably aliphatic, alkylaromatic, or aromatic. More preferably, the hydrocarbyl portion of the aldehyde or ketone is an aliphatic straight chain or a branched aliphatic group; especially preferred is an aliphatic straight chain.
• this preference for an aliphatic straight chain refers to the hydrocarbyl portions on both sides of the carbonyl group.
• the ketones and aldehydes used in the practice of this invention have from three to about twenty carbon atoms. More preferred are ketones and aldehydes having from three to about fifteen carbon atoms. Especially preferred ketones and aldehydes have a hydrocarbyl portion which is an aliphatic straight chain or a branched aliphatic group, and have from three to about fifteen carbon atoms.
• the mole ratio of the ketone or aldehyde to the primary diamine is normally at least about one mole of ketone or aldehyde per mole of amino group, /. e. , at least about two moles of ketone or aldehyde per mole of diamine.
• an excess of the ketone or aldehyde is used, more preferably at least about a 10% molar excess of ketone or aldehyde relative to the primary diamine is used.
• Large excesses of ketone or aldehyde are acceptable in the practice of the invention; the ketone or aldehyde can be, and preferably is, present in enough quantity to also act as a solvent.
• ketone or aldehyde is considered beneficial because, as is well known in the art, the formation of a diimine behaves as an equilibrium, and excess ketone or aldehyde helps shift the equilibrium to favor diimine formation.
• Suitable ketones include acetone (2-propanone), methyl ethyl ketone (2-butanone), 2-pentanone, 3-pentanone, 2-hexanone, 3-hexanone, 2-heptanone, 4-heptanone, 3-octanone, 4-octanone, 3-nonanone, 5-nonanone, 2-undecanone, 6-undecanone, di-n-hexyl ketone, 8- pentadecanone, 9-heptadecanone, 10-nonadecanone, cyclobutanone, cyclopentanone, cyclohexanone, cyclopropyl methyl ketone (l-(cyclopropyl)ethanone), cyclobutyl methyl ketone, cyclopentyl methyl ketone, cyclohexyl methyl ketone, 3 -methyl -2-pentanone, 4- methyl-2-pentanone (methyl iso
• ketones include acetone, methyl ethyl ketone, 3,3-dimethyl-2-butanone, 4-methyl-2-pentanone, cyclohexanone, 4-heptanone, and 5-nonanone.
• Acetone, methyl ethyl ketone, 4-heptanone, 3,3-dimethyl-2-butanone, and 4-methyl-2-pentanone are particularly preferred ketones in the practice of this invention.
• Aldehydes that can be used in the practice of this invention include acetaldehyde, propionaldehyde, butyraldehyde, valeraldehyde (pentanal), isovaleraldehyde, hexanal, cyclohexanecarboxaldehyde, heptaldehyde, octyl aldehyde, nonyl aldehyde, decyl aldehyde, undecyl aldehyde, dodecyl aldehyde, 2-ethylbutyraldehyde, crotonaldehyde, undecylenic aldehyde (10-undecenal), cinnamaldehyde, phenylacetaldehyde, benzaldehyde, 2,4- dimethylbenzaldehyde, tolualdehyde, mesitaldehyde, 1-naphthaldehyde, and the like
• mixtures may be employed. Such mixtures can include two or more ketones, two or more aldehydes, or at least one ketone and at least one aldehyde. The use of a mixture of ketones and/or aldehydes may result in a mixture of products.
• the ketone and/or aldehyde is in liquid form when it is used in the processes of the invention.
• elevated temperatures and/or increased pressure will liquefy the ketone or aldehyde.
• a solvent may be used to provide the ketone or aldehyde in liquid form.
• a feature of this invention is the use of an acid ion exchange resin as the acid catalyst for the formation of the diimines of the invention.
• Acid ion exchange resins are generally polymers containing protic acid functional groups, where the protic acid functional group, at least in theory, can donate a proton.
• Using an acid ion exchange resin provides the needed acid for the formation of the diimines. Since acid ion exchange resins are usually solids, dimerization and polymerization of the ketone is minimized.
• acid ion exchange resins do not add significant amounts of water to the system, another advantage, because water, especially in large amounts, can shift the equilibrium toward the ketone and primary diamine. Additionally, acid ion exchange resins can be dried to remove water present in the resin, and acid ion exchange resins can be recycled.
• a particularly preferred acid ion exchange resin is sulfonated divinylbenzene/styrene copolymer, in H ion form, sold as Amberlyst-15 (Rohm and Haas Company), in which the protic acid functional group is -SO 3 H.
• the acid ion exchange resin is typically present in amounts of about 1 wt% to about 10 wt% relative to the primary diamine. Preferably, about 3 wt% to about 7 wt% acid ion exchange resin is used relative to the primary diamine.
• hydrogenation agents can be used in the processes of the invention. Which hydrogenation agents are suitable depends on the primary diamine used in the process. Types of hydrogenation agents that can be used include hydride transfer agents such as sodium cyanoborohydride, sodium borohydride, sodium aluminum hydride, lithium aluminum hydride, and the like; "dissolving metal" reagents such as Al with alcohol, Al/Hg, Al/Pd with HCl, Na with alcohol, Na/Hg, Mg with alcohol, Fe with HCl, Zn with HCl, Zn/Cu with HCl, Zn/Hg with HCl, Zn/Pd with HCl, Zn/Cu/Pd with HCl, and the like; borane reductants including BH 3 -pyridine and BH 3 -dimethylamine; and hydrogen with a hydrogenation catalyst, where the hydrogenation catalyst can be sulfided platinum on carbon, sulfided palladium on carbon, or a mixture of
• All of these hydrogenation agents are normally suitable for processes of the invention in which the primary diamine is an aliphatic diamine or an aromatic primary diamine in which at least one position ortho to each primary amino group has a hydrogen atom as a substituent (see below).
• a preferred type of hydrogenation agent is hydrogen with a hydrogenation catalyst; an especially preferred hydrogenation catalyst is sulfided platinum on carbon.
• Some of the just-described hydrogenation agents do not seem to be as effective when the primary diamine is an aromatic primary diamine in which each position ortho to a primary amino group bears a hydrocarbyl group (see below).
• hydride transfer agents react very slowly with aromatic primary diamines in which each position ortho to a primary amino group bears a hydrocarbyl group, sometimes forming gels; in addition, to date, palladium on carbon and platinum on carbon (unsulfided, or without a strong acid present) have not yielded observable products when used with an aromatic primary diamine in which each position ortho to a primary amino group bears a hydrocarbyl group.
• Palladium on carbon and platinum on carbon can be effective hydrogenation catalysts in the presence of hydrogen sulfide or a strong acid such as sulfuric acid, hydrochloric acid, phosphoric acid, and the like, for processes using aromatic primary diamines in which each position ortho to a primary amino group bears a hydrocarbyl group.
• the hydrogenation agent is generally either a dissolving metal reagent or hydrogen with a hydrogenation catalyst, where the hydrogenation catalyst is sulfided platinum on carbon, sulfided palladium on carbon, or a mixture thereof, or is selected from palladium on carbon, platinum on carbon, and a mixture of both of these, when used with hydrogen sulfide or at least one strong acid, hi the practice of this invention, sulfided platinum on carbon, Pt(S)/C, has been found to be a particularly effective hydrogenation catalyst for aromatic primary diamines in which each position ortho to an amino group bears a hydrocarbyl group; thus hydrogen with sulfided platinum on carbon is an especially preferred hydrogenation agent for processes employing aromatic primary diamines in which each position ortho to a primary amino group bears a hydrocarbyl group.
• Suitable amounts of hydrogenation catalyst can be relatively low, i.e., in the range of about 0.5 wt% to about 10 wt% relative to the primary diamine. More suitably, in the range of about 0.75 wt% to about 6 wt% hydrogenation catalyst can be used relative to the primary diamine. It has now been found that with the use of greater amounts of the hydrogenation catalyst, the reaction occurs more quickly. Thus, a weight ratio of primary diamine to catalyst in the range of about 20:1 to about 1:20 is feasible, and a weight ratio of primary diamine to hydrogenation catalyst in the range of about 10: 1 to about 1 : 10 is preferred.
• More preferred is a weight ratio of primary diamine to hydrogenation catalyst in the range of about 1 : 1 to about 1:5.
• the use of an amount of catalyst in the preferred ranges provides secondary diamines in high yields in relatively short reaction times, in at least some instances in less than half an hour or in several minutes on the laboratory timescale.
• the hydrogenation catalyst an be in either powdered form or in granular form.
• the granular form of the hydrogenation catalyst settles out of solution more readily than does the powdered form, and the granular form tends to have slower reaction rates than are seen with powdered form.
• side reactions are minimized when the hydrogenation catalyst is in granular form.
• the preferable form for the hydrogenation catalyst may vary with the particular primary diamine and ketone or aldehyde chosen, as minimizing side reactions can be of greater significance in some systems, while in others the increased reaction rate can be more important.
• One type of aromatic primary diamine used in the processes of the invention has at least one position ortho to each primary amino group which has a hydrogen atom as a substituent, and the aromatic primary diamine is either in the form of one benzene ring having two primary amino groups on the ring, or in the form of two benzene rings connected by an alkylene bridge and having one primary amino group on each ring.
• the benzene rings may have, but need not have, one or more hydrocarbyl groups on the benzene ring(s). Hydrocarbyl groups, when present on the benzene rings, may be the same or different.
• the primary amino groups When both primary amino groups are on one benzene ring, the primary amino groups may be in any position relative to each other on the ring; preferably, the primary amino groups are meta or para relative to each other.
• the primary amino groups When the primary amino groups are on two benzene rings connected by an alkylene bridge, they may be in any position on the rings; preferably, each primary amino group is meta or para relative to the alkylene bridge.
• the alkylene bridge of the two- benzene-ring diamine has from one to about six carbon atoms; preferably, the alkylene bridge has from one to about three carbon atoms. More preferably, the alkylene bridge has one or two carbon atoms; highly preferred is an alkylene bridge having one carbon atom.
• hydrocarbyl groups when present on the benzene ring(s), are as described above for the aromatic diimines.
• the hydrocarbyl groups can have from one to about twenty carbon atoms; preferably, the hydrocarbyl groups have from one to about six carbon atoms.
• Suitable aromatic primary diamines having both primary amino groups on one benzene ring include, but are not limited to, 1,2-benzenediamine, 1,3-benzenediamine, 1,4- benzenediamine, 4-ethyl-l ,2-benzenediamine, 2-isopropyl-l ,3-benzenediamine, 4-tert-butyl- 1,3-benzenediamine, 2-pentyl-l,4-benzenediamine, 4,5-dihexyl- 1,2-benzenediamine, A- methyl-5-heptyl-l ,3-benzenediamine, 4,6-di-n-propyl-l ,3-benzenediamine, 2,5-dioctyl-l ,4- benzenediamine, 2,3-diethyl-l,4-benzenediamine, and 4,5,6-trihexyl- 1,3-benzenediamine.
• Examples of suitable aromatic primary diamines in which one primary amino group is on each of two benzene rings include 2,2'-methylenebis(benzeneamine), 2,3'-methylenebis- (benzeneamine), 2,4'-methylenebis(benzeneamine), 3,3'-methylenebis(benzeneamine), 3,4'- methylenebis(benzeneamine), 4,4 l -methylenebis(benzeneamine), 4,4'-(l ,2-ethanediyl)bis- (benzeneamine), 3,4'-(l ,3-propanediyl)bis(benzeneamine), 2,2'-methylenebis(5-tert-butyl- benzeneamine), 3,3'-methylenebis(2-methylbenzeneamine), 3,3'-methylenebis(5- pentylbenzeneamine), 3 ,3 '-methylenebis(6-isopropylbenzeneamine), 4,4'-methylenebis(2- methylbenzeneamine), 2,
• Preferred aromatic primary diamines in which one primary amino group is on each of two benzene rings and at least one position ortho to each primary amino group has a hydrogen atom as a substituent include 4,4'-methylenebis(benzeneamine) and 4,4'-methylenebis(2- methylbenzeneamine) .
• aromatic primary diamine for use in the processes of the invention, which is a preferred type of aromatic primary diamine, is an aromatic primary diamine in which each position ortho (immediately adjacent) to a primary amino group bears a hydrocarbyl group, and which aromatic primary diamine either is in the form of one benzene ring having two primary amino groups on the ring, which primary amino groups are meta or para relative to each other, or is in the form of two benzene rings connected by an alkylene bridge and having one primary amino group on each ring.
• the hydrocarbyl groups on the benzene rings (adjacent to the amino groups) generally have up to about twenty carbon atoms, and the hydrocarbyl groups may be the same or different.
• the alkylene bridge of the two- benzene-ring primary diamine has from one to about six carbon atoms; preferably, the bridge has from one to about three carbon atoms. More preferably, the alkylene bridge has one or two carbon atoms; especially preferred as the alkylene bridge is a methylene group.
• Particularly preferred hydrocarbyl groups on the benzene ring(s) are methyl, ethyl, isopropyl, butyl, and mixtures of two or more of these groups.
• butyl groups include n-butyl, sec- butyl, and t-butyl groups.
• More preferred aromatic primary diamines with two primary amino groups on one benzene ring have the primary amino groups meta relative to each other.
• the amino hydrocarbyl group preferably is a straight- chain or branched-chain alkyl group having from one to about six carbon atoms.
• Highly preferred hydrocarbyl groups are methyl, ethyl, isopropyl, butyl, and mixtures of two or more of these groups, where the preference for butyl groups includes n-butyl, sec-butyl, and t-butyl groups.
• aromatic primary diamines in which the hydrocarbyl group between the two meta primary amino groups is a methyl group, while the two remaining hydrocarbyl groups are ethyl groups, and those in which the hydrocarbyl group between the two meta primary amino groups is an ethyl group, while one of the two remaining hydrocarbyl groups is a methyl group and the other is an ethyl group, and mixtures thereof.
• More preferred aromatic primary diamines are also those in which one primary amino group is on each of two benzene rings, where the two benzene rings are connected via an alkylene bridge, and have both primary amino groups para relative to the alkylene bridge.
• An especially preferred aromatic primary diamine of this type is a compound where each hydrocarbyl group ortho to a primary amino group is an ethyl group and the alkylene bridge is a methylene group.
• Examples of more preferred aromatic primary diamines include 3,6-di-n-butyl-l,2- benzenediamine, 2,4,6-triethyl- 1 ,3 -benzenediamine, 2,4-diethyl-6-methyl- 1 ,3- benzenediamine, 4,6-diethyl-2-methyl- 1 ,3 -benzenediamine, 2,4-diisopropyl-6-methyl- 1,3- benzenediamine, 2-methyl-4,6-di-sec-butyl-l ,3 -benzenediamine, 2-ethyl-4-isopropyl-6- methyl-l ⁇ -benzenediamine ⁇ jS-tri-n-propyl-l ⁇ -benzenediamine ⁇ -diethyl-S-sec-butyl
• aromatic primary diamines particularly preferred are 4,4'-methylenebis(2,6-diethylbenzeneamine), 4,4'- methylenebis(2,6-diisopropylbenzeneamine), and a mixture of 2,4-diethyl-6-methyl-l,3- benzenediamine and 4,6-diethyl-2-methyl- 1,3 -benzenediamine (DETDA).
• DETDA 4,6-diethyl-6-methyl-l,3- benzenediamine
• DETDA 4,6-diethyl-2-methyl- 1,3 -benzenediamine
• the aliphatic primary diamines used in the processes of this invention are hydrocarbyl primary diamines where the hydrocarbyl portion of the diamine is aliphatic.
• the hydrocarbyl portion of the aliphatic diamine can be cyclic, branched, or straight chain.
• the aliphatic primary diamine has about two to about twenty carbon atoms; more preferably, the aliphatic primary diamine has about four to about ten carbon atoms.
• Particularly preferred aliphatic diamines have cyclic or straight chain hydrocarbyl portions and have about four to about ten carbon atoms.
• Suitable aliphatic primary diamines include, but are not limited to, ethylenediamine, 1,2-diaminopropane, 1,3-diaminopropane, 1,4- diaminobutane, 1,5-diaminopentane, l,5-diamino-2-methylpentane, l,6-diaminohexane,2,5- dimethyl-2,5-hexanediamine, 1 ,2-diaminocyclohexane, 1,3-diaminocyclohexane, 1,4- diaminocyclohexane, 2,4-diethyl-6-methyl- 1 ,3 -cyclohexanediamine, 4,6-diethyl-2-methyl- 1 ,3- cyclohexanediamine, 1 ,3-cyclohexanebis(methylamine), 1 ,4-cyclohexanebis(methylamine), isophorone diamine, bis(p
• Preferred aliphatic primary diamines include isophorone diamine, 1 ,6-diaminohexane, 1,8-diaminooctane, and TCD diamine.
• Particularly preferred combinations in the processes of this invention are the use of isophorone diamine with 5-nonanone, the use of isophorone diamine with 4-heptanone, the use of isophorone diamine with cyclohexanone, the use of isophorone diamine with 4-methyl-2-pentanone, the use of isophorone diamine with 3,3- dimethyl-2-butanone, the use of 1 ,6-diaminohexane with 3,3-dimethyl-2-butanone, and the use of TCD diamine with 3,3-dimethyl-2-butanone.
• solvents that can be used in processes where an acid ion exchange resin is present include, but are not limited to, liquid aromatic hydrocarbons, liquid aliphatic hydrocarbons, liquid halogenated aliphatic hydrocarbons, ethers, esters, alcohols, and mixtures of two or more solvents.
• solvent types that can be used when a hydrogenation agent is present include, but are not limited to, liquid aromatic hydrocarbons, liquid aliphatic hydrocarbons, liquid halogenated aliphatic hydrocarbons, ethers, esters, alcohols, and a mixture of two or more solvents.
• Suitable liquid hydrocarbons include benzene, toluene, xylenes, mesitylene, cumene, cymene, pentane, hexane, isohexane, cyclohexane, methylcyclohexane, heptane, octane, cyclooctane, nonane, and the like.
• liquid halogenated aliphatic hydrocarbons examples include dichloromethane, trichloromethane, 1 ,2-dichloroethane, l-bromo-2-chloroethane,(chloromethyl)cyclopropane, 1-bromobutane, cyclobutyl chloride, neopentyl chloride, l-bromo-5-chloropentane, cyclopentyl bromide, 1 ,6-dibromohexane, tr ⁇ m-l,2-dichlorocyclohexane, 1 -chloroheptane, 1,8-dichlorooctane, and the like.
• Ethers that are suitable for use in this invention include diethyl ether, di-rc-propyl ether, diisopropyl ether, di-tt-butyl ether, butyl ethyl ether, cyclohexylmethyl ether, tetrahydrofuran, 1 ,3-dioxane, 1 ,3- dioxolane, glyme (the dimethyl ether of ethylene glycol), 2-methoxyethyl ether (diglyme), and the like.
• esters examples include ethyl acetate, isopropyl acetate, n-butyl acetate, isobutyl acetate, tert-butyl acetate, n-amyl acetate, isoamyl acetate, hexyl acetate, methyl propionate, ethyl propionate, ethyl butyrate, and the like.
• Alcohols that can be used in the practice of the invention include methanol, ethanol, 1 -propanol, 2-propanol, 1 -butanol, 2-methyl-l-propanol, 1 -methyl- 1 -propanol, cyclopropylmethanol, cyclobutanol, cyclopentanol, cis-2-methylcyclohexanol, and the like.
• Preferred solvents when a hydrogenation agent is present include dichloromethane, ethyl acetate, and toluene.
• the presence of large amounts of water in the processes of the invention is usually not desirable. Without wishing to be bound by theory, it is believed that the presence of large amounts of water causes hydrolysis of the diimines. However, it has now been found that the presence of water may be less detrimental than previously believed in the processes of the invention, or at least in the processes of the invention which employ hydrogen and a hydrogenation catalyst, particularly when two phases can be formed in the reaction product mixture (e.g., an aqueous phase and an organic phase).
• One method for minimizing the amount of water in the reaction mixture is to use a water removal agent. A water removal agent may be included in the reaction mixture to remove water as the water is produced in the process.
• Suitable water removal agents include molecular sieves, silica gel, calcium chloride, and the like. Molecular sieves are a preferred water removal agent in the practice of this invention.
• a water removal agent An alternative to the use of a water removal agent is the inclusion of a solvent or enough excess ketone or aldehyde to act as the solvent to effectively dilute the water is recommended and preferred.
• a solvent When a solvent is used, a solvent that is able to azeotrope with water and thereby remove water as it is produced during a process is a preferred way of operating. Particularly preferred solvents that remove water are hexanes and toluene.
• Another preferred way of operating when using a solvent is to use a solvent which takes water into a phase separate from that in which the reaction is occurring; preferred solvents for this way of operating include toluene and dichloromethane.
• the hydrocarbyl groups on the aromatic ring and the placement of the amino groups on the ring(s) of the aromatic diimine and/or the aromatic secondary diamine formed in the processes of the invention correspond to those hydrocarbyl groups and the placement of the amino groups in aromatic primary diamine being used in the process.
• Particularly preferred solvents that remove water are hexanes and toluene.
• Another preferred way of operating is to use a solvent which takes water into a phase separate from that in which the reaction is occurring; preferred solvents for this way of operating include toluene and dichloromethane.
• the presence of a solvent in a hydrogenation is not required, but inclusion of a solvent or enough excess ketone or aldehyde to act as the solvent is recommended and preferred, because of the viscous nature of the product mixture, as described above under the discussion of solvents.
• the presence of oxygen is generally not detrimental.
• an inert atmosphere comprised of one or more inert gases, such as, for example, nitrogen, helium, or argon is often preferred, especially during hydrogenations which do not involve hydrogen gas. Operation under a blanket of hydrogen is preferred when the hydrogenation agent is hydrogen and a hydrogenation catalyst.
• Diimines including the aromatic diimines that are compositions of the present invention, can be prepared by mixing together a ketone or an aldehyde and a primary diamine in the presence of an acid ion exchange resin.
• the order of addition of the ketone, acid ion exchange resin, primary diamine, and optional solvent to the reaction zone for the preparation of the diimine is not considered important.
• the primary diamine and the ketone are mixed together prior to the addition of the acid ion exchange resin and, if used, solvent.
• the temperature is kept in the range of about 35 0 C to about reflux temperature; preferably, the temperature is such that the mixture is at about reflux temperature. Reaction times on the laboratory scale are on the order of about four hours to about sixty hours.
• At least a portion of a diimine formed in this process can be hydrogenated to form a secondary diamine.
• the diimine can be isolated from the reaction medium in which it was formed prior to the hydrogenation; however, the hydrogenation can be performed successfully without isolating the diimine from the reaction medium in which it was formed.
• a secondary diamine can be prepared by mixing together a suitable hydrogenation agent and the diimine. For the hydrogenation of the diimine, it is not necessary to exclude water. Temperatures for the hydrogenation of a diimine to form a secondary diamine are normally in the range of about 20 0 C to about 130 0 C; preferably, temperatures are in the range of about 2O 0 C to about 60 0 C.
• the hydrogen gas pressure is preferably in the range of about 14 pounds per square inch (psi) to about 300 psi (9.65xlO 4 to 2.07xl0 6 Pa); more preferably, the pressure is in the range of about 50 psi to about 150 psi (3.45xlO 5 to 1.03xl0 6 Pa).
• a particularly preferred method for preparing a secondary diamine from a diimine is to place the diimine, hydrogenation catalyst (especially sulfided platinum on carbon) and solvent in a reaction vessel, and then to seal the reaction vessel under hydrogen gas pressure. The vessel is then heated as desired while the reaction mixture is stirred.
• hydrogenation catalyst especially sulfided platinum on carbon
• Secondary diamines can be prepared in one step by mixing together, in the same reaction zone, a ketone or aldehyde, a primary diamine, an acid ion exchange resin, and a hydrogenation agent.
• the temperature is kept in the range of about 2O 0 C to about 140 0 C; preferably, the temperature is in the range of about 50 0 C to about 130 0 C. More preferably, the temperature is in the range of about 8O 0 C to about 13O 0 C.
• the hydrogen gas pressure is preferably in the range of about 14 psi to about 300 psi (9.65xlO 4 to 2.07xl0 6 Pa); more preferably, the pressure is in the range of about 50 psi to about 150 psi (3.45x10 5 to 1.03x10 6 Pa).
• Reaction times on the laboratory scale are on the order of about two hours to about eight hours. On the plant scale, reaction times are on the order of about seven hours to about twenty-four hours.
• Another way to prepare secondary diamines in one step is by mixing together at least one ketone or aldehyde, hydrogen, a hydrogenation catalyst which is sulfided platinum on carbon, sulfided palladium on carbon, or a mixture thereof, and at least one primary diamine.
• the pressure and temperature conditions for this process vary with the nature of the primary diamine used in the process.
• aliphatic primary diamines generally react more readily in comparison to aromatic primary diamines, and thus gentler conditions can be used with aliphatic diamines, although some aliphatic primary diamines with substituents in close proximity to the amino group may require more forcing conditions.
• aromatic primary diamines in which at least one position ortho to each amino group has a hydrogen atom as a substituent are more reactive than aromatic primary diamines in which each position ortho to an amino group bears a hydrocarbyl group, and thus more forcing conditions are typically necessary for the aromatic primary diamines in which each position ortho to an amino group bears a hydrocarbyl group.
• this process has yielded secondary diamines; formation of tertiary diamines has not been observed.
• the process is conducted at a temperature in the range of about 20 0 C to about 120 0 C and at a pressure in the range of about 14 to about 125 pounds per square inch (9.65xlO 4 to 8.62xlO 5 Pa).
• temperatures are in the range of about 20 0 C to about 80 0 C and pressures are preferably in the range of about 50 to about 125 pounds per square inch (3.45xlO 5 to 8.62xlO 5 Pa).
• the process is conducted at a temperature in the range of about 22°C to about 140 0 C and at a pressure in the range of about 14 to about 150 pounds per square inch (9.65x10 4 to 1.03x10 6 Pa).
• temperatures are in the range of about 50 0 C to about 130 0 C and pressures are preferably in the range of about 50 to about 125 pounds per square inch (3.45xlO 5 to 8.62xlO 5 Pa). Temperatures toward the higher end of these ranges are preferred because the reaction rates are usually faster.
• the process tends to produce a mixture of mono-substituted aromatic diamine and bis-substituted aromatic diamine.
• the temperature is increased, e.g. , to a temperature in the range of about 5O 0 C to about 13O 0 C, greater amounts of the bis-substituted aromatic diamine are formed.
• the term "mono-substituted aromatic diamine” refers to an aromatic diamine in which one amino group is secondary (i.e., substituted) and in which the other amino group remains a primary amino group.
• the term “bis-substituted aromatic diamine” refers to an aromatic diamine in which both amino groups are secondary amino groups.
• the process is conducted at a temperature in the range of about 2O 0 C to about 140 0 C and at a pressure in the range of about 14 to about 150 pounds per square inch (9.65x10 4 to 1.03x10 6 Pa).
• temperatures are in the range of about 20 0 C to about 8O 0 C and pressures are preferably in the range of about 50 to about 125 pounds per square inch (3.45xlO 5 to 8.62xlO 5 Pa).
• a particularly preferred method for preparing a secondary diamine is to place the primary diamine, hydrogenation catalyst, and solvent in a reaction vessel, and then to seal the reaction vessel under hydrogen gas pressure. The vessel is then heated as desired while the reaction mixture is stirred. On the laboratory scale, reaction times are typically about five hours to about twenty hours.
• At least one ketone or aldehyde and at least one primary diamine, these being fed separately and/or in any combination(s), and (ii) hydrogen are concurrently fed into a reaction zone in which a hydrogenation catalyst is present.
• the temperature and hydrogen pressure are continuously or substantially continuously maintained during all or substantially all of the time the concurrent feeding is occurring, such that a secondary diamine is formed.
• This method can be carried out in batch mode, in semi-batch mode, or, preferably, in continuous mode.
• the hydrogenation catalyst is charged to the reaction zone prior to the initiation of the feeds containing the primary diamine, the ketone or aldehyde, and hydrogen.
• product formation normally commences within a few minutes. In a batch operation, the feeds are typically continued until the reactor has been, or until the reactors have been, filled to the desired level. Usually at this point, the feeds are terminated, and the secondary diamine which has formed is separated from the reaction mixture, typically by distillation or recrystallization.
• a reaction zone is formed at the place at which the primary diamine, ketone or aldehyde, hydrogen, and the hydrogenation catalyst come into contact.
• the hydrogenation catalyst is placed in the intended reaction zone and the primary diamine, ketone or aldehyde, and hydrogen are fed to the location of the hydrogenation catalyst.
• the primary diamine, ketone or aldehyde, and hydrogen are concurrently fed into a reaction zone composed of at least one reactor in which the primary diamine, ketone or aldehyde, and hydrogen all come together for the first time in the presence of the hydrogenation catalyst.
• the reaction zone can be a conventional reactor, mixing vessel, pipe, or the like. Examples of suitable reactors include a packed bed reactor and a trickle bed reactor. In a particularly preferred continuous operation, the reaction zone is a tubular reactor of sufficient length and volume for the reaction to occur therein.
• the desired temperature and hydrogen pressure are continuously or substantially continuously maintained during all or substantially all of the time the concurrent feeding is occurring, such that a secondary diamine is formed.
• the hydrogen feed is such that once the hydrogen feed is initiated, the desired hydrogen pressure in the reaction zone is maintained continuously or substantially continuously.
• the reaction mixture emerging from the reaction zone can be subjected to further steps, such as separation of at least a portion of the secondary diamine product from the reaction mixture.
• the reaction mixture may be recycled to the reaction zone if desired; preferably, such recycle occurs after at least a portion of the product has been removed from the reaction mixture. Since formation of the secondary diamine is usually rapid, long ride periods are normally unnecessary.
• the hydrogenation catalyst may become inactive after long periods of use; such inactive catalyst can be, and preferably is, reactivated and reused.
• the concurrent feeds are continuous feeds. It is also preferable that the feeds are at least co-feeds ⁇ i.e., at least two feeds are utilized, namely (i) a mixture of the primary diamine and the ketone or aldehyde, and (ii) hydrogen.
• the feeds are (i) a primary diamine or a mixture of the primary diamine and the ketone or aldehyde, (ii) hydrogen, and (iii) the ketone or aldehyde. It is also within the scope of this invention to conduct other multi-feed processes. It is possible for example, to have additional feed(s) of e.g.
• ketone or aldehyde although such operation offers no particular advantage.
• the feeds are proportioned such that the ketone or aldehyde is present in excess relative to the primary amine in the reaction zone. More preferably, sufficient ketone or aldehyde is present to act as a solvent for the process. It is possible and within the scope of this invention to feed a solvent either alone, or in combination with the primary amine and/or the ketone or aldehyde, or both. However, it is preferred that the ketone or aldehyde be used as the solvent for the process.
• the feeds When operating in a continuous mode and once the continuous feeds have been initiated, the feeds may be adjusted in fine tuning the operation so as to establish and maintain the desired operating conditions for steady-state operation. Such operation typically can be conducted without mishap for long periods of time before shutdown, e.g., for plant maintenance.
• a series of two or more reaction zones may be utilized so that when the hydrogenation catalyst in one reaction zone in no longer active, the feeds of primary diamine, ketone or aldehyde, and hydrogen can be switched to another reaction zone which has active hydrogenation catalyst.
• the separate feeds can be fed in appropriate proportions on a continuous basis, and the reaction zone maintained under the appropriate reaction conditions for virtually unlimited periods of time.
• a portion of the reaction mixture is usually and preferably continuously being removed from the reaction zone.
• the term “concurrent” does not imply that the feeds must start at exactly the same time or that they must stop at exactly the same period of time. Rather, the term is used in the sense that during substantially the entire reaction period, the designated feeds are being maintained. It should also be understood that while these concurrent feeds are preferably continuous concurrent feeds, slight interruptions in a feed are acceptable provided that the duration of the interruption is sufficiently small as to cause no material disruption in the reaction. Thus as used herein, the terms “concurrent” and “continuous” should be understood to embrace the minor departures just referred to. Naturally, those skilled in the art will strive to utilize the concurrent feeds with as little nonconcurrence as possible. Likewise, those skilled in the art will of course seek to maintain the continuous feeds with as few interruptions as possible under the given circumstances in which the operation is being conducted.
• the diimines produced by the processes of this invention are usually liquids.
• the diimine can be isolated if desired.
• Methods for separating liquids that are well known in the art can be employed to separate at least a portion of the diimine from the other components of the reaction mixture. Such methods include, for example, chromatography and distillation.
• the diimine need not be isolated from the reaction mixture; instead, the diimine can be further reacted, for example, to form a secondary diamine.
• the secondary diamines produced by the processes of this invention are usually liquids, and may be isolated as just described for a diimine, or used in non-isolated form.
• distillation is a preferred separation method.
• standard solid-liquid separation methods such as centrifugation, filtration, or recrystallization can be used to separate at least a portion of the product from the liquid portion of the reaction mixture.
• aromatic primary diamine of the invention When a more preferred aromatic primary diamine of the invention (/. e. , an aromatic primary diamine which either is in the form of one benzene ring having two primary amino groups on the ring, which primary amino groups are meta or para relative to each other, and in which each position ortho to a primary amino group bears a hydrocarbyl group, or is in the form of two benzene rings connected by an alkylene bridge and having one primary amino group on each ring, and in which each position ortho to a primary amino group bears a hydrocarbyl group
• an aromatic diimine or an aromatic secondary diamine corresponding to an aromatic diimine or an aromatic secondary diamine listed above as a composition of the invention is produced.
• Aromatic diimines which are not compositions of the present invention that can be produced by the processes of the invention include, but are not limited to, N 9 N'- diisopropylidene- 1 ,2-benzenediamine, N,N'-di-sec-butylidene- 1 ,3-benzenediamine, N,N'-di(3- hexylidene)- 1 ,4-benzenediamine, N,N'-dicyclopentylidene-4-ethyl- 1 ,2-benzenediamine, N 9 N'- di-sec-butylidene-(4-tert-butyl-l,3-benzenediamine), N,N'-di(l-cycloproylethylidene)-2- pentyl-l,4-benzenediamine,N,N'-di(undecylidene)-(4-methyl-5-heptyl-l,3-benzenediamine), N,N,N
• Aromatic secondary diamines which are not compositions of the present invention that can be produced by the processes of the invention include, but are not limited to, N 9 N'- diisopropyl- 1 ,2-benzenediamine, N,N'-di-sec-butyl- 1 ,3-benzenediamine, N,N'-di(2-butenyl)- 1 ,4-benzenediamine, N,N'-dicyclopentyl-(4-ethyl- 1 ,2-benzenediamine), N,N'-di-sec-butyl-(4- tert-butyl- 1 ,3-benzenediamine), N,N'-di( 1 -cyclopropylethyl)-2-pentyl- 1 ,4-benzenediamine, N,N'-di(4-hexyl)-(4-methyl-5-heptyl-l,3-benzenediamine), N,N'-dicyclopent
• Aliphatic diimines that can be produced by the processes of the invention include, but are not limited to, N,N'-diisopropylidene-ethylenediamine, N,N'-di-sec-butylidene- 1 ,2-diaminopropane, N,N'-di(2-butenylidene)- 1 ,3-diaminopropane, N,N'-di(l - cyclopropylethylidene)-l,5-diaminopentane,N,N'-di(3,3-dimethyl-2-butylidene)-l,5-diamino- 2-methylpentane, N,N'-di-sec-butylidene-l ,6-diaminohexane, N,N'-di(3-pentylidene)-2,5- dimethyl-2,5-hexanediamine, N,N'-d
• Aliphatic secondary diamines that can be produced by the processes of the invention include, but are not limited to, N,N'-diisopropylethylenediamine, N,N'-di-sec-butyl- 1 ,2-diaminopropane, N,N'-di(2-butenyl)- 1 ,3-diaminopropane, N,N'-di(l -cyclopropylethyl)- 1 ,5-diaminopentane, N,N'-di(3,3-dimethyl-2-butyl)-l ,5-diamino-2-methylpentane, N,N'-di- sec-butyl-l,6-diaminohexane,N,N'-di(3-pentyl)-2,5-dimethyl-2,5-hexanediamine,N,N'-di(4- hexyl)- 1
• aromatic secondary diamines which are compositions of the invention are used as chain extenders in the preparation of polyurethane, polyurea, or polyurethane-urea polymers, they are used in place of the chain extenders that have previously been used in such processes, or they are used in conjunction with one or more known chain extenders, e.g., aromatic primary diamines such as those mentioned above; the aromatic polyamines of U.S. Pat.
• polyhydroxyalkanes containing 2-6 carbons and 2-3 hydroxyl groups such as ethylene glycol, the 1,2- and 1,3-propylene glycols, 1,4-, 1,2-, and 2,3-butanediols, 1,5-pentanediol, neopentyl glycol, 1 ,6-hex
• chain extender or mixture of chain extenders is reacted with an organic polyisocyanate and an active hydrogen-containing organic compound or with a prepolymer thereof having a free -NCO content of at least about 0.1% by weight to form the desired polymer.
• aromatic secondary diamines of the invention are used in place of or instead in conjunction with other chain extenders depends in part on the desired physical properties of the end product. Examples of isocyanates and active hydrogen-containing organic compounds that can be used are taught in, for example, U.S. 4,595,742.
• the aromatic secondary diamines which are compositions of this invention are to be used as curing agents for epoxy resins, they are used in place of the curing agents that have previously been used to cure such resins, or they are used in conjunction with one or more known curing agents, e.g. , aromatic polyamines and/or polyhydroxyalkanes. Whether the aromatic secondary diamines of the invention are used in place of or instead in conjunction with other curing agents depends in part on the desired physical properties of the end product.
• the epoxy resin may be any epoxy resin, i.e., it may be saturated or unsaturated, aliphatic, cycloaliphatic, aromatic, or heterocyclic. Examples of such resins are taught in Lee et al., Handbook of Epoxy Resins, McGraw-Hill (New York), 1967.
• Formulations of the invention are made from at least one polyol and/or at least one polyetheramine (sometimes referred to as an amine-terminated polyol), at least one isocyanate, and at least one aromatic secondary diamine which a composition of the invention; that is, an aromatic secondary diamine in which each amino hydrocarbyl group has at least two carbon atoms, wherein each position ortho to a secondary amino group bears a hydrocarbyl group, and which aromatic secondary diamine is either in the form of one benzene ring having two secondary amino groups on the ring, which secondary amino groups are meta or para relative to each other or is in the form of two benzene rings connected by an alkylene bridge and having one secondary amino group on each ring.
• other components may also be included in the formulations, such as one or more flame retardants, thermal stabilizers, and/or surfactants.
• a polyurethane, polyurea, or polyurea-urethane is made by blending together at least one polyol and/or at least one polyetheramine, at least one isocyanate, and at least one aromatic secondary diamine which a composition of the invention; that is, an aromatic secondary diamine in which each amino hydrocarbyl group has at least two carbon atoms, wherein each position ortho to a secondary amino group bears a hydrocarbyl group, and which aromatic secondary diamine is either in the form of one benzene ring having two secondary amino groups on the ring, which secondary amino groups are meta or para relative to each other or is in the form of two benzene rings connected by an alkylene bridge and having one secondary amino group on each ring.
• the polyol or polyetheramine, aromatic secondary diamine, and when used, optional ingredients are blended together to form a first mixture, followed by blending this first mixture with the isocyanate to form a second mixture. This second mixture is allowed to cure.
• a diluted product sample was analyzed by GC (100 0 C for 5 minutes at 10 0 C per minute rate; final temperature, 270°C).
• the GC data (normalization method) showed 100% conversion of diethyl(methyl)-l,3-benzenediamine, and a 96.5% yield of N,N'-di-sec-butyl-[diethyl(methyl)-l,3-benzenediamine].
• Diethyl(methyl)- 1 ,3 -cyclohexanediamine, as a mixture of its 2,4-diethyl-6-methyl- and 4,6-diethyl-2-methyl- isomers was made as described in Example 4.
• Diethyl(methyl)- 1,3- cyclohexanediamine, as a mixture of its 2,4-diethyl-6-methyl- and 4,6-diethyl-2-methyl- isomers (10 g), Pt(S)/C (0.5 g), Amberlyst-15 (0.5 g), and acetone (50 g) were charged into a 100 mL metal autoclave at 22 0 C.
• the closed autoclave was purged 3 times with 125 psig (9.63x10 5 Pa) of H 2 at 22°C to remove traces of air.
• the reaction mixture was then heated at 110-130 0 C under 125 psig (9.63xlO 5 Pa) of H 2 for 8 hrs (until no further H 2 uptake was observed).
• the product mixture was cooled to 22°C and degassed.
• a diluted product sample was analyzed by GC (100 0 C for 5 minutes at 10 0 C per minute rate; final temperature, 270 0 C).
• the GC data (normalization method) showed 100% conversion of diethyl(methyl)-l,3- cyclohexanediamine, and a 95-97% yield of N,N'-diisopropyl-[diethyl(methyl)-l,3- cyclohexanediamine] .
• a two-liter three neck round bottom flask was equipped with a heating mantle, a thermocouple, a glass stopper and a condenser.
• 4,4'-Methylenebis(2,6-diethylbenzeneamine) 200 g, 0.644 mol
• acetone 200 mL, 158 g, 2.72 mol
• molecular sieves 200 g
• Amberlyst-15 20 g
• N,N'-diisopropylidene-4,4'-methylenebis(2,6-diethylbenzeneamine) (2.6 g) and Pt(S)/C (0.35 g) were added to a mixture of ethanol (20 g) and ethyl acetate (20 g) in an autoclave.
• the closed autoclave was purged 3 times with 125 psig (9.63xlO 5 Pa) of H 2 at 22°C to remove traces of air.
• the mixture was kept at 22°C and 0-125 psi (0 to 8.62xlO 5 Pa) of H 2 for 1.2 hours, forming the corresponding N,N'-diisopropyl-4,4'-methylenebis(2,6- diethylbenzeneamine) in 70% yield, with 25% of the diimine underhydrogenated. Conversion of the diimine was 95%.
• N- isopropylidene-[diethyl(rnethyl)-l,3-benzenediamine] includes three isomers.
• N,N'-diisopropylidene- [diethyl(methyl)- 1 ,3 -benzenediamine] (3.17 g) and Pt(S)/C (0.3 g) were added to a mixture of ethanol (20 g) and ethyl acetate (20 g) in an autoclave. The closed autoclave was purged 3 times with 125 psig (9.63x10 5 Pa) of H 2 at 22 0 C to remove traces of air.
• the mixture was kept at 22°C and 0-125 psi (0 to 8.62xlO 5 Pa) of H 2 for 1.2 hours, forming the corresponding N,N'-diisopropyl- [diethyl(methyl)- 1 ,3 -benzenediamine] in 94% yield.
• Six percent of the diimine was underhydrogenated; conversion of the diimine was 100%.
• a two-liter three neck round bottom flask was equipped with a magnetic stirrer, a heating mantle, a thermocouple, a glass stopper and a Dean Stark trap fitted with a condenser.
• 4,4'-Methylenebis(2,6-diethylbenzeneamine) 310.5 g, 1.00 mol
• methyl ethyl ketone 450 mL, 350 g, 4.85 mol
• This mixture was stirred at 4O 0 C to dissolve the 4,4'-methylenebis(2,6-diethylbenzeneamine).
• Hexanes (300 mL) and Amberlyst-15 (15.54 g) were added to the flask.
• N,N'-di-sec-butylidene-4,4'-methylenebis(2,6-diethylbenzeneamine) 22.53 g
• Pt(S)/C 2.65 g
• acetone 34.0 g
• the closed autoclave was purged 3 times with 125 psig of H 2 (9.63x10 5 Pa) at 22°C.
• the mixture was kept at 21 0 C and 125 psi (8.62xl0 5 Pa) of H 2 for 6.5 hours, forming the corresponding N,N'-di-sec-butyl-4,4'- methylenebis(2,6-diethylbenzeneamine) quantitatively.
• a two-liter three neck round bottom flask was equipped with a magnetic stirrer, a heating mantle, a thermocouple attached to a thermowatch, and a condenser fitted with a
• N,N'-di-sec-butylidene-[diethyl(methyl)-l,3-benzenediamine] (28 g) andPt(S)/C (2.8 g) were added to acetone (30 g) in an autoclave.
• the closed autoclave was purged 3 times with 125 psig (9.63xl0 5 Pa) of H 2 at 22 0 C.
• the mixture was kept at 21°C and 125 psi (8.62xlO 5 Pa) of H 2 for 12 hours, forming the corresponding N,N'-di-sec-butyl- [diethyl(methyl)- 1 ,3 -benzenediamine] quantitatively.
• reaction masses from Runs 2, 3, 4, and 5, and 1000 g of the final reaction mass from Run 1 were combined into a 100 liter reactor as space permitted. Each reaction mass was filtered with a 10-inch, 0.5-micron cartridge filter into the 100 liter reactor. The bulk of the MEK was removed at atmospheric pressure. The combined product was distilled at less than 1 torr (133 Pa) at 134 to 141°C to give 2.189 g of a forecut, 30.0 kg of a main cut, and 2370 g of dark distillation pot bottoms.
• composition of this material was 78.85 area % N,N'-di-sec-butyl-[2,4-diethyl-6-methyl-l,3- benzenediamine] and 16.67 area % N,N'-di-sec-butyl-[4,6-diethyl-2-methyl-l,3- benzenediamine].
• the partially reacted species found in the GC were identified as diimines (unhydrogenated) or a compound with a secondary amino group and an imino group (partially hydrogenated).
• reaction mixture was stirred at 110-130 0 C under 93 psig (7.43xlO 5 Pa) of H 2 for 24 hours.
• GC indicated 100% conversion of the starting materials, and a 93.6% yield of the product, N,N'-di-(5-nonyl)-isophoronediamine.
• the product mixture was cooled to 22 0 C and degassed.
• a diluted product sample was analyzed by GC (100 0 C for 5 minutes at 10 0 C per minute rate; final temperature, 270 0 C).
• the GC data (normalization method) showed 100% conversion of diethyl(methyl)-l,3-benzenediamine, and an 88.8% yield of N 5 N'- di-sec-butyl- [diethyl (methyl)- 1 ,3-benzenediamine] .
• the reaction mixture was then stirred for 4 hours at 60 0 C, after which GC showed 79.5% conversion of 4,4'-methylenebis(2,6-dimethylbenzeneamine).
• the reaction mixture was then stirred for 11 hours at 13O 0 C, after which GC showed 100% conversion of 4,4'- methylenebis(2,6-dimethylbenzeneamine), and a 96% yield of N,N'-di-sec-butyl-4,4'- methylenebis(2,6-dimethylbenzeneamine); the remaining 4% was determined to be N-sec- butyl-4,4'-methylenebis(2,6-dirnethylbenzeneamine).
• the product was observed to be water- white in color, and the structure of the product was confirmed by GC-MS.
• Example 20 The procedure of Example 20 was repeated, except that 5.0 g isophoronediamine, 5.0 g Pt(S)/C, and 50g MIBK were used, and the reaction time after reaching 135°C was 24 minutes. GC analysis showed 100% conversion of isophoronediamine, some primary amine, some ketimine, 95% yield of N,N'-di-[2-(4-methylpentyl)]-isophoronediamine, and no tertiary amine.
• Isophoronediamine (5 g), Pt(S)/C (5 g), and 4-methyl-2-pentanone (MIBK; 54 g) were charged to a 100 mL autoclave.
• the autoclave was degassed three times with H 2 (111 psig; 8.67xlO 5 Pa) at 22 0 C and mixture heated to 135°C for about 30 minutes.
• the reaction mixture was cooled to 22 0 C and degassed.
• the reaction was stopped by quenching with ice water.
• GC analysis showed 100% conversion of isophoronediamine, and a 98% yield of N 5 N'- di- [2-(4-methylpentyl)] -isophoronediamine.
• Example 22 The procedure of Example 22 was repeated, except that 1O g isophoronediamine, 5 g Pt(S)/C, and 54 g MIBK were used. GC analysis showed 4% isophoronediamine, 2.3% ketimine, 93.7% N,N'-di-[2-(4-methylpentyl)]-isophoronediamine; no tertiary amines were observed.
• GC indicated a 100% conversion of isophorone diamine and a 97 area % yield of desired product, which was then identified and confirmed by GC-MS.
• the gel time of N,N'-di-5-nonyl-isophoronediamine in a polyurea formulation similar to those in Examples 29-32 (see below) was 59 seconds.
• a heated stainless steel tubular upflow reactor is used.
• the reactor is packed with Pt(S)/C.
• Isophoronediamine and 4-methyl-2-pentanone are co-fed to the reactor.
• the isophoronediamine is fed at a rate of 0.5 g per minute, and 4-methyl-2-pentanone is fed at a rate of 5 g per minute.
• Hydrogen is also co-fed into the reactor with the isophoronediamine and the 4-methyl-2-pentanone.
• Conditions in the reactor are 100 psig and 140 0 C.
• the yield of N,N'-di-[2-(4-methylpentyl)]-isophoronediamine is 96%; no tertiary amines are observed.
• the primary amine is N-sec-butyl-[diethyl(methyl)-l,3-benzenediamine]; the secondary diamine is N,N'-di-sec-butyl-[diethyl(methyl)-l,3-benzenediamine].
• Polyurea formulations containing isocyanate (Rubinate ® ⁇ , 9480, Huntsman Chemical), Jeffamine ® D-2000, Jeffamine® T-5000, Ethacure ® 100, and N,N'-di-sec-butyl-4,4'- methylene-bis(2,6-diethylbenzeneamine) were prepared as described in Example 29. Amounts of the components in each formulation are listed in Table 7; the amount of N-sec- butyl-4,4'-methylenebis(2,6-diethylbenzeneamine) listed is the amount present intheN,N'-di- sec-butyl-4,4'-methylenebis(2,6-diethylbenzeneamine). The formulations were subjected to testing. Properties of the formulations are summarized in Table 7.
• the primary amine is N-sec-butyl-4,4'-methylenebis(2,6-diethylbenzeneamine), a monosubstituted product;
• the secondary diamine is N,N'-di-sec-butyl-4,4'- methylenebis(2,6-diethylbenzeneamine).
• Formulations similar to the those in Examples 29-32 were made with N 5 N'- diisopropyl-4,4'-methylenebis(benzeneamine) and N,N'-di-5-nonyl-isophoronediamine.
• the gel time (cure rate) for the N,N'-diisopropyl-4,4'-methylenebis(benzeneamine) formulation was 300 seconds, and the gel time for the N,N'-di-5-nonyl-isophoronediamine formulation was 59 seconds.
• Another formulation similar to those in Examples 29-32 was made with N,N'-di-2-(4-methylpentyl)-isophoronediamine; the gel time for this formulation was 22 seconds.
• Polyurea formulations containing isocyanate (Rubinate 9480, Huntsman Chemical), Jeffamine ® D-2000, Jeffamine® T-5000, Ethacure ® 100, and/or N,N'-di-(3,3-dimethyl-2- butyl)-TCD diamine were prepared as described in Example 29.
• One formulation was prepared using only Ethacure 100, for comparative purposes.
• Amounts of the components in each formulation are listed in Table 11.
• the formulation having N,N'-di-(3,3-dimethyl-2- butyl)-TCD diamine without Ethacure 100 was observed to be brittle.
• the formulations were subjected to testing. Properties of the formulations are summarized in Table 11.
• reactants and components referred to by chemical name or formula anywhere in this document, whether referred to in the singular or plural, are identified as they exist prior to coming into contact with another substance referred to by chemical name or chemical type (e.g. , another reactant, a solvent, or etc. ). It matters not what preliminary chemical changes, transformations and/or reactions, if any, take place in the resulting mixture or solution or reaction medium as such changes, transformations and/or reactions are the natural result of bringing the specified reactants and/or components together under the conditions called for pursuant to this disclosure.
• the reactants and components are identified as ingredients to be brought together in connection with performing a desired chemical operation or reaction or in forming a mixture to be used in conducting a desired operation or reaction.
• an embodiment may refer to substances, components and/or ingredients in the present tense ("is comprised of, “comprises”, “is”, etc.), the reference is to the substance, component or ingredient as it existed at the time just before it was first contacted, blended or mixed with one or more other substances, components and/or ingredients in accordance with the present disclosure.

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