Polymers produced by using sulphur compounds in the form of transfer agents for controlled radical polymerisation of acrylic acid and the use thereof

A technology of acrylic acid homopolymer and acrylic acid, applied in organic chemistry, chemical instruments and methods, chemical/physical processes, etc., capable of solving complex problems

Active Publication Date: 2007-04-18
COATEX SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0048] At first this document mentions complex calcium carbonate and kaolin adsorption phenomenon (3076 page 5-7 lines), secondly its synthetic conditions can not satisfy those skilled in the art: the polymerization of acrylic acid is in methanol, ethanol, 2-propanol or For the presence of dioxane, all the controversial issues are latent between the solvent and the transfer agent

Method used

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  • Polymers produced by using sulphur compounds in the form of transfer agents for controlled radical polymerisation of acrylic acid and the use thereof
  • Polymers produced by using sulphur compounds in the form of transfer agents for controlled radical polymerisation of acrylic acid and the use thereof
  • Polymers produced by using sulphur compounds in the form of transfer agents for controlled radical polymerisation of acrylic acid and the use thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0113] The purpose of this example was to synthesize compounds useful in the preparation of the homopolymers and copolymers of the present invention.

[0114] Test n°1

[0115] Preparation of Compound A with the following general formula:

[0116]

[0117] - where R 1 represents an alkyl group having 4 carbon atoms;

[0118] -M 1 and M 2 Represents the sodium atom Na.

[0119] In a beaker stirred with a magnetic stirrer, weigh the following:

[0120] - 30 grams of water;

[0121] - 19.5 g of 2-bromohexanoic acid.

[0122] The mixture was neutralized with 50% sodium hydroxide solution until the pH was equal to 6.5. The temperature was raised to 52°C. A homogeneous solution was then obtained, which was cooled to 43°C.

[0123] Then, 30.8 g of a 25% aqueous solution of disodium trithiocarbonate were added dropwise over 20 minutes.

[0124] Under stirring, it was allowed to react for 2 hours. The S-alkylation reaction was slightly exothermic and the temperature rose...

Embodiment 2

[0127] The purpose of this example is to illustrate how the inventive acrylic acid homopolymers can be obtained in water by using sulfur-containing compounds in a controlled free-radical polymerization process of the RAFT type.

[0128] Test n°2

[0129] In a 1-liter reactor equipped with a mechanical stirrer and a heating device of the oil bath type, the following substances are introduced:

[0130] - 150 grams of water;

[0131] - 50 grams of acrylic acid;

[0132] - 17.1 g of a solution comprising 17.1% of a compound of formula (I'):

[0133]

[0134] - where R 1 represents an alkyl group having 1 carbon atom;

[0135] -M 1 and M 2 Represents the sodium atom Na.

[0136] - 0.4 g of a polymerization initiator of the 4,4'-azobis(4-cyanovaleric acid) type sold under the trade name V501 by the company Aldrich.

[0137] While stirring, the mixture was heated to a temperature of 100°C. The temperature was then maintained at 95°C for 2 hours. This gave a clear, slight...

Embodiment 3

[0195] This example illustrates the use of the polymers of the present invention as grinding aids for minerals, especially calcium carbonate. This example also illustrates the preparation of an aqueous suspension of calcium carbonate according to the invention.

[0196] It is to be noted that these calcium carbonate suspensions according to the invention are finely divided, highly concentrated with minerals and are easy to handle by the end user, ie as paper coating and paper bulk filler.

[0197] For this purpose, an aqueous suspension was prepared from calcium carbonate with a median particle size of about 7 microns from Orgon deposit (France).

[0198] The dry matter concentration of the aqueous suspension was 76% by weight relative to the total mass.

[0199] Grinding aids are added to the suspension according to the amount shown in the table below, and the amount is expressed as a percentage of dry weight relative to the mass of dry calcium carbonate to be ground.

[02...

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Abstract

The invention relates to polymers produced by using sulphur compounds for a method for the controlled radical polymerisation of acrylic acid and/or acrylic acid with hydrosoluble monomers in water. Said invention also relates to the use of said polymers in the form of dispersing agents or grinding aid agents and/or aid agents for combined grinding of mineral materials in an aqueous suspension or in the form of dispersing agents directly incorporated into aqueous formulations containing mineral materials. The formulations of the thus obtained mineral materials are also disclosed.

Description

technical field [0001] The present invention relates to homopolymers of acrylic acid and / or copolymers of acrylic acid and other water-soluble monomers through controlled free radicals of the RAFT type in water of homopolymers of acrylic acid and / or copolymers of acrylic acid and other water-soluble monomers Polymerization method obtains, and wherein as transfer agent is the compound of formula (I'): [0002] [0003] - where R 1 represents an alkyl group having 1-10 carbon atoms, a simple aryl group or a simple aryl group substituted by an alkyl chain having 1-4 carbon atoms; [0004] - and where M 1 and M 2 denotes a hydrogen atom, an amine salt, ammonium or an alkali metal cation, and they are the same or different. [0005] These acrylic acid homopolymers and / or copolymers of acrylic acid and other water-soluble monomers are characterized in that they have a polydispersity index of less than 2.2 and comprise at the chain ends a motif of the general formula (I): [...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C329/00C08F2/38C08F20/06C09D7/45C09K23/52
CPCC08F20/06C08F2/38C08F120/06C08F220/06
Inventor J-M·苏奥C·雅格梅特
Owner COATEX SA
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