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Nitrile rubbers and production thereof in organic solvents

A nitrile rubber, unsaturated technology, used in the field of structural elements derived from these modifier compounds, can solve problems that are not shown, industrial implementation can not be known from industry, great success prospects, etc.

Inactive Publication Date: 2015-06-24
ARLANXEO DEUT GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these studies so far have not shown great prospects for success, and until today the practical industrial implementation of this method is neither known from the literature nor from the industry.

Method used

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  • Nitrile rubbers and production thereof in organic solvents
  • Nitrile rubbers and production thereof in organic solvents
  • Nitrile rubbers and production thereof in organic solvents

Examples

Experimental program
Comparison scheme
Effect test

example

[0360] In the examples below, mass spectrometry (MS) is used to clearly show that the nitrile rubbers according to the invention comprise a modifier segment based on the modifier used as an end group of the polymer chain. Furthermore, the activity of the polymers prepared in this way and comprising the modifier segments as macromolecular modifiers for further use was clearly demonstrated by the production of an NBR-block-polystyrene system.

[0361] The following abbreviations are used in some places below:

[0362] ACN acrylonitrile

[0363] 1,3-BD 1,3-butadiene

[0364] DMAc Dimethylacetamide

[0365] MCB monochlorobenzene

[0366] DoPAT Dodecyl Propionate Trithiocarbonate

[0367] VAm 110 1,1'-Azobis(n-butyl-2-methylsulfonamide) (Wako Pure Chemical Industries, Ltd.) V301-[(1-cyano-1-methylethyl)azo]methanol Amide (Wako Pure Chemical Industries, Ltd.) 1,1'-Azobis(cyclohexanecarbonitrile) (DuPont)

[0368] m w Weight average molecular weight

[0369] m n Number ave...

example 1-5

[0382] Example 1-5 (the present invention):

[0383] Preparation of Nitrile Butadiene Rubber ("NBR") in Different Organic Solvents with Different Modifier Concentrations

[0384] The nitrile rubbers NBR #1 to #5 used in the following series of examples were prepared according to the base formulation reported in Table 1, where all ingredients are reported in parts by weight per 100 parts by weight of the monomer mixture. Table 1 also indicates especially the polymerization conditions.

[0385] All apparatus were oxygen freed by triple evacuation and flushing with argon prior to exposure to 1,3-butadiene.

[0386] In Example 1, the polymerization was carried out as follows:

[0387] Will 284.9mg (1.17mmol, corresponding to 0.31phm) and 204mg of DoPAT (0.583mmol, corresponding to 0.22phm) were dissolved in 50ml (51phm) of dimethylacetamide, and 43ml of acrylonitrile (653.3mmol, corresponding to 37phm ), and the solution was degassed with argon for 10 minutes. The monomer / ...

example 6

[0389] Example 6 (the present invention):

[0390] Preparation of NBR terpolymer with hydroxyethyl acrylate (HEA) as the third monomer (third monomer) in organic solvent

[0391] Trimeric NBR#6 was synthesized according to the general synthesis instructions given above for Example 1. Only the amount of monomers used was changed; the individual amounts of these ingredients can be found in Table 1. Hydroxyethyl acrylate (HEA) and acrylonitrile (ACN) were added to the solvent before degassing with argon. The reaction was terminated after 6 hours (final conversion 39%).

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Abstract

A new process is provided for preparing nitrile rubbers by free-radical polymerization in an organic solvent and in the presence of specific modifier substances. This polymerization may be followed by hydrogenation to give likewise new hydrogenated nitrile rubbers, the hydrogenation advantageously taking place likewise in organic solvent. The optionally hydrogenated nitrile rubbers obtained are notable for having fragments of the employed modifier substances in the main polymer chain and / or as end groups. They can be prepared with a wide diversity of molecular weights and polydispersity indices, especially with very low polydispersity indices.

Description

technical field [0001] The present invention relates to a process for the preparation of nitrile rubber by radical polymerization in solution and in the presence of a specific modifier mixture, and also to having Novel nitrile rubbers derived from the structural elements of these modifier compounds, and to a process for hydrogenating such nitrile rubbers, and to the corresponding hydrogenated nitrile rubbers. Background technique [0002] Nitrile rubber (also referred to simply as "NBR") is a copolymer or terpolymer of at least one α,β-unsaturated nitrile, at least one conjugated diene and optionally one or more additional copolymerizable monomers. Polymer. Hydrogenated nitrile rubbers ("NBR") are corresponding copolymers or terpolymers in which some or all of the C═C double bonds of the copolymerized diene units have been subjected to hydrogenation. [0003] Both NBR and HNBR have established themselves in the field of specialty elastomers for many years. They have an ex...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F236/12C08F2/40C08C19/02C08L19/00
CPCC08C19/02C08C19/20C08L19/006C08L15/005C08L35/00C08F236/12C08F2/40C08L19/00
Inventor 迈克尔·克林佩尔斯文·布兰道乌韦·韦斯特普克里斯托弗·巴尔纳-科沃利克安德烈亚斯·凯泽
Owner ARLANXEO DEUT GMBH