- Synthesis process of hexamethylenediamine piperidine
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The invention relates to a synthesis process of hexamethylenediamine piperidine. The process comprises the steps of: carrying out heating dehydration reaction on 2, 2, 6, 6-tetramethyl-4-piperidone and 1, 6-hexamethylenediamine in a negative pressure environment until no water is removed from the system, and adding a water removing agent to separate the residual water from the liquid system so asto obtain an intermediate Schiff base; introducing hydrogen into the obtained Schiff base in the presence of a catalyst for hydrogenation reaction to obtain hydrogenation liquid; and filtering out thecatalyst from the hydrogenation liquid, rectifying the filtrate, and carrying out crystallization-desolvation to obtain the hexamethylenediamine piperidine finished product. According to the method,a small amount of residual water is removed by using the water removal agent, so that the Schiff base is prevented from being decomposed in the presence of trace water, the purity of the Schiff base is improved, the yield of hexamethylenediamine piperidine is increased, and few solid wastes are generated; according to the method, negative pressure reaction and crystallization treatment are innovatively adopted, so that the quality of hexamethylenediamine piperidine is high, the solvent can be continuously recycled and reused, and no organic waste liquid is generated.
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Paragraph 0042-0065
(2020/11/09)
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- MULTIFUNCTIONAL SYNERGISTIC MACROMOLECULAR ANTI-OXIDATION STABILIZER AND PREPARATION METHOD AND USE THEREOF
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Disclosed is an anti-oxidation stabilizer, which has the following structure (A), wherein R1 is a connection chain, and the connection chain is a fatty chain, an aromatic structural chain or a fatty and aromatic structurally combined chain; R2 is (B), and X is O, S, N or NH or —CONR—, Z is O, S, N or NH, and X is different from Z; R is a fatty chain, an aromatic group, a sterically hindered amine or sterically hindered phenol, R3 is a fatty chain, an aromatic group, a sterically hindered amine or sterically hindered phenol, and R is identical to R3, or R is different from R3; n is a positive integer including 1, n1 is a positive integer including 1, and n is identical to n1, or n is different from n1.
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Paragraph 0063; 0065-0066
(2017/12/27)
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- 4-Formyl amino-n-methylpiperidine derivatives, the use thereof as stabilisers and organic material stabilised therewith
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The present invention relates to 4-formylamino-N-methylpiperidine derivatives of the formula (I) where the variables are as defined in the Description, to a process for preparing these piperidine derivatives, to the use of these piperidine derivatives of the invention, or prepared according to the invention, for stabilizing organic material, in particular for stabilizing plastics or coating materials, and also to the use of these piperidine derivatives of the invention, or prepared according to the invention, as light stabilizers or stabilizers for wood surfaces. The present invention further relates to stabilized organic material which comprises these piperidine derivatives of the invention or prepared according to the invention.
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- Process for producing N,N'-bis(2,2,6,6-tetramethyl-4-piperidyl)alkanediamine
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Crude N,N'-bis(2,2,6,6-tetramethyl-4-piperidyl)alkanediamine represented by the formula: STR1 wherein n is an integer of 2 to 10, is purified by crystallization from a ketone solvent of 3 to 9 carbon atoms. The purified product thus obtained has a purity of 98% by weight or more, a 2,2,6,6-tetramethyl-4-piperidone content of 150 ppm or less, and an initial APHA value of 30 or less. The purified product is also inhibited from discoloration with the passage of time.
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- Piperidine-triazine compounds containing tetrahydrofuran or tetrahydropyran groups, for use as stabilizers for organic materials
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Compounds of the formula (I) STR1 in which A1 is e.g. --O-- or >N--R1 where R1 is e.g. hydrogen, methyl, 2,2,6,6-tetramethyl-4-piperidyl or 1,2,2,6,6-pentamethyl-4-piperidyl, A2 is e.g. a direct bond or --CH2 --, X1 and X3 which can be identical or different are e.g. a group of the formula (IIIa) or (IIIb) STR2 in which A3 and A4 which can be identical or different are e.g. an >N--R1 group where R1 is as defined above, R3 is e.g. --(CH2)2-6 -- or --(CH2)3 --O--(CH2)2-4 --O--(CH2)3 -- and R4 is e.g. hydrogen or methyl, X2 is e.g. 2-hydroxytrimethylene or a group of the formula (IVa) STR3 where R8 is e.g. a group of the formula (V) STR4 m is e.g. zero or 1, n is e.g. a number from 1 to 10, Y1 is e.g. OH, ONa, OK, a group R8 or a group --X1 Z or --X3 Z with Z being e.g. hydrogen or methyl and Y2 is e.g. hydrogen, methyl or a group STR5 with the provisos that (1) X1 or X2 or X3 contains a group of the formula (II), STR6 with R2 being e.g. hydrogen or methyl, that (2) each of the groups A1, A2, X1, X2, X3 and m has the same or a different definition in the individual recurring structural units of the formula (I) and that (3) the only definition of Y1 is the group --X1 Z, when m is zero and n is 1.
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- Certain [(2,2,6,6-tetramethyl-4-piperidyl)amino]-1,3,2-dioxaphosphorinanes useful as stabilizers for protecting resins
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Compounds of the formula I or II, STR1 wherein m is 1 or 2, A is branched or unbranched 1,2- or 1,3-alkylene, or o-phenylene, E is a group III or IIIa, R is hydrogen or methyl, R1 and R3 are hydrogen, alkyl, alkenyl, aralkyl, alkanoyl, alkenoyl, benzoyl or cyanomethyl, R2 is a radical of valency m and R4 is a monovalent radical, are effective processing stabilizers for polymers, in particular for polyolefins, and additionally have a stabilizing action against damage by light.
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- Process for the production of polyalkylpiperidylamines
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A process for producing polyalkylpiperidylamines of the formula (I): STR1 wherein R1 is hydrogen or a C1 -C12 alkylradical; R2 and R3 are each C1 -C5 alkylradicals or R2 and R3, taken together, are --(CH)--a or --CH2 --NR1 --C(R5,R6)--CH2 --; R4 is a C2 -C18 alkylene radical, which is unsubstituted or substituted by C1 -C3 alkyl; a C5 -C12 cycloalkylene radical, which is unsubstituted or is methyl-substituted; a cycloalkylene radical of the formula STR2 where the cyclohexyl rings are unsubstituted or are methyl-substituted; or groups of the formula --(CH2)k --X--[CH2)m --X]--n (CH2)p --, where X is --O--, --NH--, --NR5 and R5 and R6 are each a C1 -C5 alkyl radical and a is 4 or 5, k is 2 or 3, n is 0-3 and p is 2 or 3; which process involves reductively alkylating an alkylated 4-aminopiperidine of the formula (II): STR3 with a difunctional alcohol of the formula HO--R4 --OH, wherein R1 and R4 have the above definitions.
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- Hindered amine light stabilizers for polymers
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Oligomers of the formula STR1 which contain at least one piperidyl radical per repeating unit are useful as light stabilizers for polymers.
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- Novel light stabilizers for polymers
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Oligomers of the formula STR1 which contain at least one piperidinyl moiety in the repeating unit are useful as light stabilizers for polymers.
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- Novel polytriazine compounds
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Novel tetraalkyl piperidine radical containing polytriazine compounds are produced by reacting a dihalogen-triazine with a bifunctional compound containing amine, alcohol, mercaptan or phenol groups at least one of the bifunctional compounds containing a tetraalkyl piperidine radical. The compounds are valuable light stabilizers for synthetic polymers, particularly polyolefin in the form of fibers or films.
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