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Process for making improved aliphatic dicarboxylic acid copolymers

A technology of aliphatic dicarboxylic acid and copolymer, which is applied in the direction of drilling compositions, chemical instruments and methods, and can solve problems such as high molecular weight and unreachable composition

Active Publication Date: 2010-08-18
ROHM & HAAS CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Despite prior art attempts to address the problem of higher residual levels, prior art compositions do not achieve the desired higher molecular weight

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0043] Example #1 (wt% composition: 55% acrylic acid / 45% maleic acid)

[0044] To a 2 liter round bottom flask equipped with a mechanical stirrer, heating mantle, thermocouple, condenser and inlets for addition of monomer and initiator was added 161.65 g (1.648 moles) of maleic anhydride and 238 g of deionized water. The mixture was stirred and 263.7 grams of 50% aqueous sodium hydroxide solution (3.296 moles NaOH) was slowly added to the flask while maintaining the temperature below 90°C. When the NaOH addition was complete, 20 grams of deionized water was added to rinse the remaining sodium hydroxide into the flask. At the same time, 212.8 grams (2.953 moles) of a monomer solution of glacial acrylic acid were added to a graduated cylinder for addition to the flask. Mix an initiator solution of 2.1 grams of sodium persulfate dissolved in 20 grams of deionized water, add 11.41 grams of 35% hydrogen peroxide to the sodium persulfate solution, mix well, and add to a syringe fo...

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PUM

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Abstract

The present invention relates to the production of aqueous solutions or dispersions of high molecular weight, high solids copolymers of aliphatic dicarboxylic acids, especially maleic acid, with [alpha],[beta]-ethylenically unsaturated monomers having carboxyl or sulfonic acid groups, such as (meth)acrylic acid or 2-acrylamido-2-methyl propane sulfonic acid (AMPS), respectively, which solutions or dispersions have a very low residual content of unpolymerized dicarboxylic acid monomer.

Description

technical field [0001] The present invention relates to the preparation of aqueous solutions or dispersions of high molecular weight, high solids content copolymers of aliphatic dicarboxylic acids (especially maleic acid) and α, β-ethylenically unsaturated monomers, said α, β- Ethylenically unsaturated monomers contain carboxylic acid groups or sulfonic acid groups, such as (meth)acrylic acid or 2-acrylamido-2-methylpropanesulfonic acid (AMPS), respectively, the solution or dispersion The body has an extremely low residual content of unpolymerized dicarboxylic acid monomer. The copolymers are useful as antiscalants, dispersants, cleaning additives, deflocculants, and fluid retention aids for water-based drilling slurries used in petroleum drilling operations. Background technique [0002] Copolymers of aliphatic monoethylenically unsaturated mono- and dicarboxylic acids are well known in the art and have been used as scale inhibitors and deflocculants in aqueous systems, an...

Claims

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Application Information

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IPC IPC(8): C08F2/10C08F220/06C08F222/06C08F222/02C09K8/52C09K8/035
CPCC08F220/06C08F222/06C08F220/585
Inventor M·P·克里默J·曼纳
Owner ROHM & HAAS CO
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