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Oil soluble comb polymers

A comb-shaped polymer and lubricating oil technology, applied in lubricating compositions, petroleum industry, additives, etc., can solve the problems of shear stability and molecular weight decrease in parallel, achieve high viscosity index improvement, and simple preparation, easy The effect of preparation

Active Publication Date: 2008-03-12
EVONIK OPERATIONS GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, shear stability decreases in parallel with molecular weight due to chain scission at high shear drop

Method used

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  • Oil soluble comb polymers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-7 and comparative example 1-4

[0138] Into an apparatus equipped with a 4-neck flask and a KPG-saber stirrer was initially introduced 150 g of a mixture of low molecular weight monomers and macromers whose composition is shown in Table 3, along with 65 g of Shell Risella 907 oil and 35 g of KPE 100N oil. After heating to 120°C under nitrogen, 0.9 g of tert-butyl peroxybenzoate were added and the temperature was maintained. 3 hours and 6 hours after the first initiator addition, 0.3 g of tert-butyl peroxybenzoate were each successively supplied again, and the mixture was stirred at 120° C. overnight. On the second day the mixture was diluted with 125g of KPE 100 oil. 375 g of a 40% comb polymer solution in mineral oil are obtained.

Embodiment 8-11

[0140] Into an apparatus equipped with a 4-neck flask and a KPG-saber stirrer was initially introduced 150 g of a mixture of low molecular weight monomers and macromers whose composition is shown in Table 3, along with 65 g of Shell Risella 907 oil and 35 g of KPE 100N oil. After heating to 90° C. under nitrogen, 0.3 g of tert-butyl per-2-ethylhexanoate are added and the temperature is maintained. 3 hours and 6 hours after the first initiator addition, 0.3 g of tert-butyl per-2-ethylhexanoate were each successively supplied again, and the mixture was stirred at 90° C. overnight. The next day the mixture was diluted with 125g of KPE 100 oil. 375 g of a 40% comb polymer solution in mineral oil are obtained.

Embodiment 12 and 13

[0142] Into an apparatus equipped with a 4-necked flask and a KPG-saber stirrer were initially introduced 150 g of a mixture of low molecular weight monomers and macromers whose composition is shown in Table 3, and 100 g of toluene. After heating to 90° C. under nitrogen, 0.3 g of tert-butyl per-2-ethylhexanoate are added and the temperature is maintained. 2 hours, 4 hours, 6 hours and 8 hours after the first initiator addition, 0.3 g of tert-butyl per-2-ethylhexanoate were each successively supplied again, and the mixture was stirred at 90° C. overnight. The next day the mixture was diluted with 225 g of KPE 100N oil and the toluene was removed by degassing on a vacuum rotary evaporator. 375 g of a 40% comb polymer solution in mineral oil are obtained.

[0143] Considering the net composition of macromonomers and low molecular weight monomers forming 150 g and the functionality of the macromonomers f MM , to determine the net composition in terms of the mass fraction of eac...

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Abstract

The invention relates to comb polymers which comprise, in the main chain, repeating units which are derived from polyolefin-based macromonomers, and repeating units which are derived from low molecular monomers which are selected from the group consisting of styrene monomers having 8 - 17 carbon atoms, alkyl(meth)acrylates having 1 - 10 carbon atoms in the alcohol group, vinyl esters having 1 - 11 carbon atoms in the acyl group, vinyl ethers having 1 - 10 carbon atoms in the alcohol group, (Di)alkylfumarates having 1 - 10 carbon atoms in the alcohol group, (Di)alkylmaleates having 1 - 10 carbon atoms in the alcohol group and mixtures of said monomers. The molar branching degree lies in the region between 0.1 - 10 mol. % and the comb polymer represents the sum of at least 80 wt. %, in relation to the weight of the repeating units, on repeating units which are derived from polyolefin-based macromonomers, and repeating units which are selected from low molecular monomers which are selected from the group consisting of styrene monomers having 8 - 17 carbon atoms, alkyl(meth)acrylates having 1 - 10 carbon atoms in the alcohol group, vinyl esters having 1 - 11 carbon atoms in the acyl group, vinyl ethers having 1 - 10 carbon atoms in the alcohol group, (Di)alkylfumarates having 1 - 10 carbon atoms in the alcohol group, (Di)alkylmaleates having 1 - 10 carbon atoms in the alcohol group, and mixtures of said monomers.

Description

technical field [0001] The present application relates to oil-soluble comb polymers, processes for their preparation and their use. Background technique [0002] Polyalkyl(meth)acrylates (PAMA), usually synthesized by simple free-radical copolymerization of mixtures of different alkyl methacrylates (AMA), act as oil additives, giving rise to viscosity index (VI ) increased, and with other viscosity index improvers (VII) compared with outstanding low temperature performance (see R.M.Mortier, S.T.Orszulik (editor), Chemistry and Technology of Lubricants (lubricant chemistry and technology), Blackie Academic & Professional, No. 1 edition, London, 1993, 124-159 and 165-167). An essential prerequisite for usability as an oil additive is generally the oil solubility of the polymer, which in the case of PAMA is based on the presence of a sufficiently large number of alkyl side chains typically having 6 to 24 carbon atoms. To increase the VI of PAMA, it is often turned to the impl...

Claims

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Application Information

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IPC IPC(8): C08F290/04C08F299/00
CPCC08F290/04C08F299/00C10M159/005C10M2203/1006C10M2203/1025C10M2205/028C10M2205/0285C10M2209/04C10M2209/062C10M2209/084C10M2209/086C10N2020/04C10N2020/071C10N2030/06C10N2030/04C10N2030/02C10N2030/68C10N2020/02C08F210/00C08F212/00C08F220/00
Inventor T·施特尔B·艾森贝格M·米勒
Owner EVONIK OPERATIONS GMBH
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