Trithiocarbonate derivatives and the use thereof in the form of transfer agents for acrylic acid controlled radical polymerisation
AssigneeCoatex
InventorsJean-Marc Suau, Christian Jacquemet
Life of this patent
Estimating the term…
Abstract
The invention relates to novel sulphur compounds, to the production thereof by a method carried out in an aqueous medium and the use thereof in the form of transfer agents in a method for controlled radical polymerisation of acrylic acid and/or acrylic acid with water-soluble monomers in water. The thus obtained polymers are usable in the form of dispersing agents or grinding aid agents and/or aid agents for combined grinding of mineral materials in an aqueous suspension and in the form of dispersing agents directly incorporated into aqueous formulations containing mineral materials.
Claims26
Compounds having a chemical structure in accordance with the following formula (I):
- where R1 designates an alkyl radical having 2 to 10 carbon atoms, an aromatic radical optionally substituted by an alkyl chain having 1 to 4 carbon atoms;
- and where M1 and M2 designate the hydrogen atom, an amine salt, ammonium or an alkaline cation, and are identical or different.
Process for manufacturing in water a compound of formula (I) comprising the steps of:
- a) Bringing into contact by pouring an aqueous solution of disodic trithiocarbonate Na2CS3 or an aqueous solution of dipotassic trithiocarbonate K2CS3 on a solution of a halogenated salt, which salt has a chemical structure in accordance with the following formula (II):
- where R1 designates an alkyl radical having 2 to 10 carbon atoms, an aromatic radical optionally substituted by an alkyl chain having 1 to 4 carbon atoms;
- where M designates ammonium or an alkaline cation;
- where X designates a halogen.
- b) and acidification of the resulting compound after step a).
A method of using the compounds having chemical structure is in accordance with the following formula (I′):
- where R1 designates an alkyl radical having 1 to 10 carbon atoms, an aromatic radical optionally substituted by an alkyl chain having 1 to 4 carbon atoms;
- and where M1 and M2 designate the hydrogen atom, an amine salt, ammonium or an alkaline cation, and are identical or different as transfer agents in a process of controlled radical polymerisation of the RAFT type in water, of homopolymers of acrylic acid and/or copolymers of acrylic acid with other water-soluble monomers.
Dependencies are inferred from the claim text.