Propargyl compounds, and preparation thereof

Abstract: The invention provides a novel class of propargyl compounds represented by the formula: wherein R is an C₁-C₂₀ alkyl group, C₁-C₂₀ alkylene group, C₁-C₂₀ alkylene group interrupted by ―NH― group(s), C₆-C₇ alicyclic group and an aromatic group; R₁ comprises 1-100% ―CH₂-C≡CH group and 99-0% hydrogen atom and n is an integer of 1 to 4, and preparation thereof. These compounds are useful as coating material or sealer or rim-injection molding material.

Description: The present invention relates to a novel class of propargyl compounds and preparation thereof. The invention also concerns a coating composition, a sealer and a molding material containing the same. Background of the invention Recently, various resins are used for the coating of electric or electronic parts, automobile and airplane parts, plant parts and the like. In curing such resinous material, methods for using a curing agent as aminoplast resin or isocyanate compound (including blocked isocyanate compound) or effecting oxidative polymerization of resinous material itself have been widely used. However, in the curing method with an aminoplast resin, there are such problems as liberation of the formed alcohol or water and thermal instability of the formed bond, and in the curing method with an isocyanate compound, a difficult problem of workability. Further more, in the curing method of relying on an oxidative polymerization of resinous material, it is essential to adopt an elevated temperature which is not economical and undesired. Under the circumstances, a novel curing system has been longed for. A compound having an acetylenic group or propargyl group can exhibit various reactivities as diene polymerization reactivity, oxidative coupling property, trimerization or tetramerization property and the like. Such reactions can be easily proceeded with by the application of photo-, thermal or electric energy. Especially, such compound can give a high molecular weight compound through polycondensation reaction by the application of thermal energy, and since the reaction does not accompany with the formation of any volatile material or liberated product, public attention is directed to this novel curing system. Many compounds having end acetylenic or propargyl groups have been reported in various publications (unexamined) JP-A-55-94351, ibid 55-94352 and ibid 63-117034, corresponding with US-A-4 180 649, US-A-4 178 430 and EP-A-0 267 076, respectively. Regarding propargyl compounds, U.S. 3,386,897 discloses and US Patent Nos. 4,395,540 and 4,431,792 disclose compounds of the formula: in which 1-100% of R stands for -CH₂-C≡CH and 99-0% of R stands for CH₃. However, all of the proposed propargyl compounds referred to above are mono-substituted amine compounds which have rather poor reactivities of propargyl group. Chemical Abstracts, Vol. 68 (1968), page 9186, Abstract No. 95413c discloses the tetra-propargyl derivative of para phenylene diamine and of benzidine and the mono- or di-propargyl derivative of naphthylamine. Tetrahedron, Vol. 29 (1973), pages 4111-4125 discloses mono- or di-propargyl derivatives of an amine compound of the formula R-NH₂, in which R stands for n-C₇H₁₅, n-C₆H₁₃ , n-C₅H₁₁, n-propyl, t-butyl, cyclohexyl, CH₂-CH=CH₂, PhCH₂ or Ph. Chemische Berichte, Vol. 114, (1981), pages 2519-2535 discloses the reaction of among others di- and tripropargylamines with boranes. Chemical Abstracts, Vol. 90 (1979), page 169, Abstract No. 198887u discloses the dipropargyl derivative of benzylamine. It is an object of the invention to provide a novel class of propargyl compounds which have improved reactivities and are useful as coating material or sealer for aircraft parts, plant material, electric or electronic parts and the like or as rim-injection-molding material. Details of the invention According to the invention, the abovementioned object can be attained with a class of propargyl compounds represented by the formula: wherein R is an alkylene group having 1 to 20 carbon atoms; an alkylene group having 2 to 20 carbon atoms interrupted by -NH-or group(s); an alicyclic group having 6 to 7 carbon atoms; an aromatic group selected from naphthalene, diphenyl methane, 2,2-diphenyl propane and diphenyl sulfone; piperazine; spiroundecane, said R being optionally substituted by lower alkyl, halogen, nitro, lower alkoxy or cyano group; or halogen substituted biphenyl; and n is an integer of 2 to 4. They are all novel compounds and may be advantageously prepared by the reaction of 1 mol of amine compound represented by the formula: R(NH₂)n (II) in which R and n are as defined above, and 1.05-6 mols of propargyl halide. In the actual production of such propargyl compound [I], 1 mol of the amine compound [II] R(NH₂)n [II] and 2-6 mols of propargyl halide are reacted, preferably in water-organic solvent system, in the presence of an phase transfer catalyst the reaction product obtained is subjected to a column chromatography to obtain a pure compound [I]. As the starting amine compounds [II], many compounds are available in the market and the following may be satisfactorily used. Polyamines: Aliphatics: ethylene diamine, 1,2-diamino propane, 1,3-diamino propane, 1,2-diamino butane, 1,3-diamino butane, 1,4-diamino butane, 1,5-diamino pentane, 1,6-diamino hexane, 1,9-diamino nonane, 1,10-diamino decane, 1,12-diamino dodecane and polymethylene diamines having up to 20 carbon atoms; Alicyclics: isophoron diamine and diamino cyclohexane; Aromatics: diamine compounds represented by the formula: H₂N-R-NH₂ as, for example, 4,4'-diamino diphenyl sulfone, 3,3'-diamino diphenyl sulfone, bis(3-ethyl-4-aminophenyl) methane, bis (3-chloro-4-aminophenyl) methane, 3,3'-diamino phenyl sulfone, 4,4'-diamino phenyl sulfone, 4,4'-diamino phenyl methane, 2,2'-bis (4-aminophenyl) propane, 2,2'-bis (4-aminophenyl) hexafluoropropane, 2,2'-bis (3-hydroxy-4-aminophenyl) propane, 2,2'-bis (3-hydroxy-4-aminophenyl) hexafluoropropane, 9,9'-bis (4-aminophenyl)-10-hydro-anthracene 4,4' diamino 2, 3, 5, 6, 2', 3', 5', 6'-octafluorobiphenyl and 3,9-bis (3-aminopropyl) 2,4,8,10-tetraspiro (5,5) undecane. Examples of propargyl halide are propargyl bromide and propargyl chloride. These compounds (amine and propargyl halide) are reacted each other at an elevated temperature, preferably in a mixed medium of water and organic solvent and in the presence of phase transfer catalyst comprising dehydrohalogenation agent and quaternary ammonium salt (e.g. NaOH-tetra-ammonium bromide). If desired, the reaction product thus obtained is subjected to silica gel column chromatography to separate the di-substituted compound [I], which is then purified by means of recrystallization with an appropriate solvent. Thus obtained propargyl compound of the present invention is characterized by having far improved reactivities of the propargyl group contained, as compared with that of mono-substituted derivative, including coreaction activities toward olefinic compound. Thus, the present propargyl compound is excellent in diene polymerization reactivity, oxidative coupling reactivity, trimerization or tetramerization reactivity and such reactions may be easily carried out by the application of photo-, thermal or electric energy. Therefore, the present propargyl compounds are quite useful, by themselves or in the combination with other high molecular weight binder materials, as coating material or sealer for various substrates. The present invention shall be now more fully explained in the following Examples. Example 1 Into a reaction vessel fitted with a stirrer, a reflux condenser and a nitrogen gas inlet tube, were placed 30.05g (0.5mol) of ethylene diamine, 84.21g of sodium hydroxide, 180g of deionized water, 180g of methylene chloride and 1.0g of tetrabutyl-ammonium bromide and the mixture was stirred and added dropwise with 249.81g (2.1 mols) of propargyl bromide at a room temperature. After completion of said addition, the mixture was heated to 50°C and reacted at the same temperature for 6 hours. Thereafter, using a separate funnel, methylene chloride layer was separated from an aqueous layer, washed with deionized water several times and then the solvent was removed to obtain a crude product. The product was subjected to silica gel column chromatography (Wako Gel C-200) to obtain purified N,N,N',N'-tetra propargyl ethylene diamine (yield 92%). Example 2 Into a reaction vessel fitted with a stirrer, a reflux condenser and a nitrogen gas inlet tube, were placed 99.12g (0.5 mol) of p,p'-diamino diphenyl methane, 84.21g of sodium hydroxide, 180g of deionized water, 180g of dichloroethane and 1.0g of tetrabutyl-ammonium bromide. To this, 249.81g (2.1 mols) of propargyl bromide were dropwise added at 80°C for 5 hours under stirring and after completion of said addition, the combined was heated to 90°C and reacted at the same temperature for 6 hours. Thereafter, the dichloro ethane layer was separated, washed several times with deionized water and by using an evaporator, unreacted material and solvent were removed off to obtain a crude product, which was then purified by means of silica gel column chromatography. Pure N,N,N',N'-tetra propargyl-p,p'-diamino diphenyl methane was obtained in 89% reaction yield. Example 3 Into a reaction vessel fitted with a stirrer, a reflux condenser and a nitrogen gas inlet tube, were placed the amine derivative identified in Table 1 (0.5 mol), 63.15 g of sodium hydroxide, 180 g of deionised water, 180 g of dichloroethane, and 1.0 g of tetrabutyl-ammonium bromide and to this propargyl bromide (2.7 mols) were dropwise added at 80°C for 5 hours under stirring. After completion of said addition, the mixture was heated to 90°C and reacted at the same temperature for 6 hours. Thereafter, the dichloroethane layer was separated, washed several times with deionized water and by uisng an evaporator, unreacted material and solvent were removed off to obtain a crude product. This was purified by using a silica gel column chromotography to obtain pure product mentioned in Table 1. Example 4 Using the amine derivative shown in Table 1 as starting material, the similar procedures were repeated as in the preceding Example and the propargyl compound mentioned in Table 1 was prepared. Properties of thus obtained products and reaction yields are shown in the Table 1.

Claims: A polyfunctional propargyl amine compound, characterized in that the compound is represented by the formula: wherein R is an alkylene group having 1 to 20 carbon atoms; an alkylene group having 2 to 20 carbon atoms interrupted by -NH-or group(s); an alicyclic group having 6 to 7 carbon atoms; an aromatic group selected from naphthalene, diphenyl methane, 2,2 - diphenyl propane and diphenyl sulfone; piperazine or spiroundecane, said R being optionally substituted with a lower alkyl, halogen, nitro, lower alkoxy or cyano group; or halogen substituted biphenyl; and n is an integer of 2 to 4. A process for preparing polyfunctional propargyl amine compound as defined in claim 1, characterized in that an amine compound represented by the formula: R(NH₂) n in which R and n are as defined in claim 1 is reacted with a propargyl halide. A process according to claim 2, characterized in that the reaction is carried out in a water-organic solvent medium and in the presence of a phase transfer catalyst and the thus obtained product is purified by column chromatography. A process according to claim 2 or 3, characterized in that the molar ratio of said amine compound to propargyl halide is 1 : 1.05 to 1 : 6. A process according to claim 4, characterized in that the molar ratio of said amine compound to propargyl halide is 1 : 2 to 1 : 6.

Inventors: AOKI KEI, YAMADA MITSUO, AOKI, KEI, YAMADA, MITSUO
Applicants: NIPPON PAINT CO LTD, NIPPON PAINT CO., LTD.
Application year: 1990
Main classification: C07C211
IPC codes: C07C317, C07C211, C07D241, C07C255, C08F38, C07D295