- A N, inter-N' - phenylene bismaleimide preparation method
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The invention discloses a N, inter-N' - phenylene bismaleimide preparation method, which belongs to the technical field of fine chemicals. The raw material is toluene, maleic anhydride and the polymerization inhibitor, heated to 40 - 60 °C dissolve; the metaphenylene diamine dissolved in strong polar solvent then drop added in a reaction vessel, and milling after thermal insulation, adding catalyst heating temperature to reflux, until no more water is stopped when the reaction is separated out; the reaction cooling after crystallization, filtered, washed with water, to obtain pale yellow solid N, between the N' - phenylene bismaleimide. The invention two-step reaction in the same reaction in the container, does not need to separation and purification of the intermediate product, its synthesis process is simple in operation, the working environment is obviously improved. The sold product liquid chromatography the content of 75% -80%, for the production of this invention liquid chromatography content can be up to 90% or more, the purity is higher than current commercial products.
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Paragraph 0027
(2019/07/04)
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- N, inter-N' - phenylene bismaleimide and its preparation method
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The invention provides a preparation method of a multifunctional rubber vulcanizer N,N'-m-phenylenedimaleimide under the condition of no acetic anhydride. M-phenylenediamine, cis butenyl maleic anhydride, toluene and ethyl acetate are used as raw materials to synthesize the N,N'-m-phenylenedimaleimide. The reaction process is simple and does not need acid anhydride or any other catalyst; and the obtained product has high purity.
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Paragraph 0016; 0017; 0018; 0019; 0020; 0021; 0022-0030
(2017/05/10)
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- Process for the preparation of aromatic maleimides
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Aromatic maleimides can be prepared by reacting corresponding aromatic amines with maleic anhydride in the presence of a solvent mixture of halogenated hydrocarbon and a dipolar aprotic solvent, with the addition of acid and a polymerization inhibitor.
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- Functional monomaleimide and thermosetting composition therefrom
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Novel N-(meth)allyloxyphenylmaleimides are prepolymerized with at least one bis-imide and formulated, together with at least one imidazole compound, into thermosetting compositions useful for the production of a wide variety of shaped articles having improved mechanical properties.
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- Curable mixtures based on maleimides and propenyl-substituted phenols, and the use thereof
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Curable mixtures of (a) maleimides of the general formula I STR1 wherein R is an n-valent aliphatic or aromatic radical, and n is the number 1, 2 or 3; and (b) mono- or polyvalent phenols which contain in the molecule at least one 1-propenyl group in the ortho- or para-position with respect to the hydroxyl group, or isomeric mixtures of mono- or polyvalent phenols which are propenyl-substituted in the ortho- or para-position and mono- or polyvalent phenols which are allyl-substituted in the ortho- or para-position, the proportion of propenyl groups in the isomeric mixture having to be at least 5 equivalent-%, relative to the sum of the equivalents of propenyl and allyl groups. The novel mixtures cure at elevated temperatures relatively rapidly, and produce molded materials having valuable mechanical properties.
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- Preparation of maleimides and dimaleimides
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A process for the preparation of maleimides and dimaleimides in high yield, wherein in the first step maleic anhydride and a suitable primary amine or diamine are contacted at about 30°-60° C. in the presence of a simple, cheap organic solvent; and in the second step the thus-formed intermediate is cyclized, without prior isolation, at 45°-60° C. in the presence of a lower fatty acid anhydride, a tertiary amine having a pKa of at least 10 and of a salt of magnesium, lithium, manganese(II), or cobalt(II) soluble in the liquid reaction medium to the extent of at least 0.2 weight percent. Alternatively, the tertiary amine can be added in the first step. The product maleimide or dimaleimide normally can be isolated by filtration after cooling to room temperature. Water-miscible solvents may be diluted with water prior to product isolation. Certain N,N'-arylene-dimaleimides, which can be prepared by this process, are vulcanization adjuvants for elastomers.
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