Commonwealth Scientific and Industrial Research Organisation

Other

E.i. Dupont De Nemours and Company

Ici Australia Operations Proprietary Limited

Australian Institute of Marine Science

Orica Australia Pty Ltd

Graham Bird

David John Rigg

Neil Fitzmaurice

San Hoa Thang

Peter James Chalmers

Graeme Moad

Ezio Rizzardo

Tam Phuong Le

Charles T Berge

Michael Fryd

Gordon Francis Meijs

Christopher Scopazzi

Jeffrey W Johnson

John Chiefari

Roshan Tyrrel Mayadunne

William Brown Farnham

Sheau-Hwa Ma

Alexei Alexeyevich Gridnev

Albert Gordon Anderson

Pathiraja Arachchillage Gunatillake

Catherine Louise Moad

Graham J Bird

Jeffery W Johnson

Richard Alexander Evans

Albert Mau

Peter J Chalmers

Julia Krstina

David J Rigg

Gerry Swiegers

Yen Kwong Chong

Enzio Rizzardo

Gerry Wilson

Roshan Mayadunne

Massimo Benaglia

Tracey Michelle Hinton

John Chiefair

A method of preparing polymer, the method comprising polymerizing one or more ethylenically unsaturated monomers of formula (I)  

Raft polymerisation

The present invention is directed to a process for the cleavage of one or more starting polymers having thiocarbonylthio groups of the formula (I) into derived polymers in which the &#x2014;S&#x2014;(C&#x2550;S)&#x2014; group is transformed. The process includes contacting the starting polymer containing groups Ywith one or more reagents containing groups Xto produce the derived polymer and a byproduct containing the groups Y, wherein the groups Xis one or more reactive groups and the groups Yis an extracting group and a byproduct, which is then separated from the derived polymer by conventional separation processes. The derived polymer is free from odor or color that is sometimes associated with the starting polymer and it can be used in making optical lenses, such as high refractive index spectacle lenses.

Process for transforming the end groups of polymers

The present invention is directed to a process for the cleavage of one or more starting polymers having thiocarbonylthio groups of the formula &#x2014;S&#x2014;(C&#x2550;S)&#x2014; into derived polymers having thiol end groups of the formula &#x2014;SH. The process includes contacting the aforedescribed starting polymers, with a reagent having the formula XY, wherein Xis a nucleophilic group and Yis an extracting group that results in the starting polymer and a byproduct, which is then separated from the derived polymer by conventional separation processes. The derived polymer is free from any odor or color that is sometimes associated with the starting polymer and it can be used in making optical lenses, such as contact lenses.

Process for synthesizing thiol terminated polymers

This invention provides a method for removing certain sulfur-containing groups from polymers, especially those made via RAFT polymerization processes.

Method for removing sulfur-containing end groups

This invention concerns a free radical polymerization process, selected chain transfer agents employed in the process and polymers made thereby, in which the process comprises preparing polymer of general Formula (A) and Formula (B) comprising contacting: (i) a monomer selected from the group consisting of vinyl monomers (of structure CH&#x2550;CUV), maleic anhydride, N-alkylmaleimide, N-arylmaleimide, dialkyl fumarate and cyclopolymerizable monomers; (ii) a thiocarbonylthio compound selected from Formula (C) and Formula (D) having a chain transfer constant greater than about 0.1; and (iii) free radicals produced from a free radical source; the polymer of Formula (A) being made by contacting (i), (ii) C and (iii) and that of Formula (B) by contacting (i), (ii) D, and (iii); and (iv) controlling the polydispersity of the polymer being formed by varying the ratio of the number of molecules of (ii) to the number of molecules of (iii); wherein Q, R, U, V, Z, Z', m, p and q are as defined in the text. 

Polymerization with living characteristics

This invention concerns a free radical polymerization process, selected chain transfer agents employed in the process and polymers made thereby, in which the process comprises preparing polymer of general Formula (A) and Formula (B) comprising contacting: (i) a monomer selected from the group consisting of vinyl monomers (of structure CH=CUV), maleic anhydride, N-alkylmaleimide, N-arylmaleimide, dialkyl fumarate and cyclopolymerizable monomers; (ii) a thiocarbonylthio compound selected from Formula (C) and Formula (D) having a chain transfer constant greater than about 0.1; and (iii) free radicals produced from a free radical source; the polymer of Formula (A) being made by contacting (i), (ii) C and (iii) and that of Formula (B) by contacting (i), (ii) D, and (iii); and (iv) controlling the polydispersity of the polymer being formed by varying the ratio of the number of molecules of (ii) to the number of molecules of (iii); wherein Q, R, U, V, Z, Z', m, p and q am as defined in the text. 

This invention concerns a free radical polymerization process, selected chain transfer agents employed in the process and polymers made thereby, in which the process comprises preparing polymer of general Formula (A) and Formula (B) comprising contacting: (i) a monomer selected from the group consisting of vinyl monomers (of structure CH&#x2550;CUV), maleic anhydride, N-alkylmaleimide, N-arylmaleimide, dialkyl fumarate and cyclopolymerizable monomers; (ii) a thiocarbonylthio compound selected from Formula (C) and Formula (D) having a chain transfer constant greater than about 0.1; and (iii) free radicals produced from a free radical source; the polymer of Formula (A) being made by contacting (i), (ii) C and (iii) and that of Formula (B) by contacting (i), (ii) D, and (iii); and (iv) controlling the polydispersity of the polymer being formed by varying the ratio of the number of molecules of (ii) to the number of molecules of (iii); wherein Q, R, U, V, Z, Z', m, p and q are as defined in the text 

The invention provides in one aspect a process for preparing a microgel by RAFT polymerizing in the presence of a RAFT chain transfer agent, one or more solvophobic monomers and one or more solvophilic monomers to form one or more block copolymers comprising one or more solvophobic blocks and one or more solvophilic blocks wherein the solvophobic block is insoluble in a dispersing medium and the solvophilic block is soluble in the dispersing medium. The block copolymer is dispersed in the dispersing medium to form micelles, which is then stabilized to form the microgel. The dispersing medium can be aqueous or lipophilic. The method of the present invention also permits one to encapsulate a wide variety of materials, such as pigments, dye molecules, and aluminum flakes used in metallized paints.

Process of microgel synthesis and products produced therefrom

Microgels and process for their preparation

A free radical polymerization process suitable for synthesizingpolymers is disclosed. The process utilizes novel sulfur based chain transfer agents and is widely compatible over a range of monomers and reaction conditions. Novel polymers having low pollydispersity and predictable specific polymer architecture and molecular weight are produced by the process. The polymers produced by the process are suitable for use as binders in automotive OEM and refinish coatings.

Polymerization process with living characteristics and polymers made therefrom

The present invention is directed to a process for forming star shaped microgels which include a core of crosslinked polymer and multiplicity of substantially linear polymeric arms of macromonomers attached to the core. The process includes polymerizing monoethylenically unsaturated monomers in the presence of a chain transfer agent to form macromonomers each having a terminal polymerizable ethylenically unsaturated group and then polymerizing, in presence of the macromonomers, the monoethylenically unsaturated monomers and multi-olefinic crosslinking monomers. The microgels of the present invention can be used as rheology control agents in waterborne and solvent-borne coatings and in adhesives and cosmetics.

Process for preparing star shaped microgels from macromonomers with terminal ethylenic unsaturation

A free radical polymerization process suitable for synthesizing polymers is disclosed. The process utilizes novel sulfur based chain transfer agents and is widely compatible over a range of monomers and reaction conditions. Novel polymers having low polydispersity and predictably specific polymer architecture and molecular weight are produced by the process. The polymers produced by the process are suitable for use as binders in automotive OEM and refinish coatings.

This invention relates to the synthesis of dithiocarboxylic acid esters by reaction of bis(thioacyl) disulphides, thioacetals or vinylidane bis(thioether) with free-radicals (optionally in the presence of monomers). The invention also relates to processes for the synthesis of polymers utilising these dithioesters as polymerisation regulators (chain transfer agents) or to the use of bis(thioacyl) disulphides to generate dithioester chain transfer agents in situ.

Synthesis of dithioester chain transfer agents and use of bis(thioacyl) disulfides or dithioesters as chain transfer agents

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Clayton South, Australia

San Hoa Thang