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Hydrogenation of diene-based polymer latex

A technology of polymers and dienes, applied in the field of selective hydrogenation of carbon-carbon double bonds

Active Publication Date: 2009-06-24
LANXESS INC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Routes associated with the use of water-soluble catalysts also suffer from significant difficulties in overcoming cross-linking problems

Method used

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  • Hydrogenation of diene-based polymer latex

Examples

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example

[0112] The following examples illustrate the scope of the invention and are not intended to limit it.

[0113] The results clearly show the various operating conditions under which it is possible to obtain high degrees of hydrogenation.

[0114] The materials used in the hydrogenation reactions are listed in Table 1.

[0115] Table 1: Specifications of materials

[0116]

example 1

[0118] (for comparison, only rhodium salt (representing the first major catalyst component) is used without the secondary water-insoluble catalyst component)

[0119] A 300 ml glass-lined stainless steel autoclave with temperature control, stirrer and hydrogen addition point was used as the reactor.

[0120] Mix 25ml of the above latex, 75ml of water, and 0.012g of RhCl 3 ·3H 2 O was added to the reactor. The latex was then degassed with nitrogen. The temperature was raised to 100°C and hydrogen was introduced to 1000 psi (6.8 MPa).

[0121] After 4 hours, the degree of hydrogenation reached 23%. A gel was produced and the resulting polymer was partially insoluble in methyl ethyl ketone.

example 2

[0122] Example 2: (the present invention)

[0123] The same procedure as described in Example 1 was used. However 0.013g of RhCl was used 3 ·3H 2 O and 0.36 g of PPh 3 , the hydrogen pressure used was 1000 psi (6,8 MPa) and the temperature was 160°C.

[0124] After 19 hours, a degree of hydrogenation of 97% was achieved. The resulting latex can coagulate and the final rubber is gel-free and all soluble in methyl ethyl ketone.

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Abstract

The present invention relates to a process for the hydrogenation of the carb on- carbon double bonds in a diene-based polymer latex in the absence of any organic solvent by a catalytically active system prepared in-situ based on a first main catalyst component and a secondary water-insoluble catalyst component.

Description

technical field [0001] The present invention relates to a process for the selective hydrogenation of carbon-carbon double bonds in diene-based polymers in latex form by employing Group VIII noble metal-based catalysts in the absence of any organic solvent. Background technique [0002] It is known that carbon-carbon double bonds in polymers can be successfully hydrogenated by treating the polymer with hydrogen in an organic solution in the presence of a catalyst. Such methods can be selective in double bonds being hydrogenated such that, for example, double bonds in aromatic or cycloalkane groups are not hydrogenated and between carbon and other atoms such as nitrogen or oxygen The double or triple bond is not affected. The technical field includes many examples of catalysts suitable for these hydrogenations, including catalysts based on cobalt, nickel, rhodium, ruthenium, osmium, and palladium. Catalyst suitability depends on the degree of hydrogenation required, the rate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08C19/02C08F8/04
CPCC08C19/02C08F8/04C08F36/00C08F4/60
Inventor 潘勤敏加里·伦佩尔魏真理
Owner LANXESS INC
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