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Low molecular weight graft copolymers

A technology of graft copolymer and low molecular weight, which is applied in the field of graft copolymer to achieve the effect of inhibiting scale formation and reducing scaling

Active Publication Date: 2008-09-10
AKZO NOBEL CHEM INT BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] Unfortunately, graft copolymers generally do not function as well as synthetic polymers in applications such as those described above (e.g., inhibition, dispersion and / or interference)

Method used

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  • Low molecular weight graft copolymers
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0156] The following examples serve to illustrate the present invention, but are not intended to limit the scope of the present invention. The breadth and scope of the present invention are limited only by the appended claims.

[0157] The molecular weights of all graft copolymers in the following examples were determined by aqueous gel permeation chromatography ("GPC") using a series of polyacrylic acid standards. The method uses NaN 3 0.05M Sodium Phosphate (0.025M NaH 2 PO 4 and 0.025M Na 2 HPO 4 ) as the mobile phase. The columns used in this method are: TSKgel PWxl Guard column, TSKgel; G6000PWxl, G4000PWxl, G3000PWxl, G2500PWxl set at a temperature of 32°C. The flow rate was 1 mL / min, and the injection volume was 450 μL. The instrument is calibrated by using five different polyacrylic acid standards injected at five different concentrations: PAA1K (2.0mg / mL), PAA5K (1.75mg / mL), PAA85K (1.25mg / mL), PAA495K (0.75mg / mL) mL), and PAA1700K (0.2 mg / mL), all commerciall...

Embodiment 1-

[0181] According to the low molecular weight copolymers of the present invention, high levels of FAS are used to produce lower molecular weight polymers.

[0182] The copolymer in Comparative Example 2 was replicated in the same manner, except that instead of 0.00075 grams of FAS, 0.075 grams of FAS was used (equivalent to 100 times the level of FAS used in Comparative Example 1, or 0.19 mmol of FAS and 400ppm (according to Fe moles / acrylic acid monomer moles)). The final product is a dark amber solution with a Gardner color value of 12. The number average molecular weight of the polymer was 5,265 as determined by the aqueous GPC method. This example illustrates that a higher level of Fe(II) (400 ppm instead of 4 ppm) is required to reduce molecular weight compared to Comparative Example 1 . However, this resulted in a darker colored material as evidenced by the Gardner color jump from 1 to 12.

Embodiment 2-

[0184] According to the low molecular weight copolymers of the present invention, high levels of FAS are used to produce lower molecular weight polymers

[0185]The copolymer in Comparative Example 1 above was replicated in the same manner, except that instead of 0.00075 grams of FAS, 0.75 grams of FAS was used (equivalent to 1,000 times the level of FAS used in Comparative Example 1, or 1.9 mmol of FAS and 4000ppm (according to moles of Fe / moles of acrylic acid monomer)). The final product was a very dark amber solution with a Gardner color value of 18. The number average molecular weight of the polymer was 5,380 as measured by the aqueous GPC method. (The Mn is within experimental error and may indicate the limit of low Mn achievable at elevated Fe levels.)

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Abstract

Low molecular weight graft copolymer comprising a synthetic component formed from at least one or more olefinically unsaturated carboxylic acid monomers or salts thereof, and a natural component formed from a hydroxyl-containing natural moiety. The number average molecular weight of the graft copolymer is about 100,000 or less, and the weight percent of the natural component in the graft copolymer is about 50 wt % or greater based on total weight of the graft copolymer. Processes for preparing such graft copolymers are also disclosed.

Description

technical field [0001] The present invention relates to graft copolymers of materials of synthetic origin and of natural origin. More particularly, the present invention relates to low molecular weight graft copolymers, as well as anti-scalant and / or dispersant formulations or compositions comprising such polymers and their use in aqueous systems, including Fouling minimization and dispersion. Background technique [0002] Many industrial aqueous systems require various materials to be maintained in a soluble, suspended or dispersed state. Examples of such aqueous systems include boiler water or steam generation systems, cooling water systems, gas scrubbing systems, pulp and paper mill systems, desalination systems, fabric, container and hard surface cleaning systems, and production in gas, oil and geothermal wells Downhole systems encountered in . Often, the water in these systems contains components such as inorganic salts, either naturally or through contamination. If...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F251/00C11D3/37C02F5/10C08L51/02C08K3/00C09K8/035E21B33/13C08F220/06C08F222/02
CPCC08F251/00C08F289/00
Inventor K·A·罗德里格斯N·T·莱J·桑德斯
Owner AKZO NOBEL CHEM INT BV