Browse Prior Art Database

USE OF SOLVENTS IN DISPERSION POLYMERIZATION

IP.com Disclosure Number: IPCOM000011986D
Publication Date: 2003-Mar-28
Document File: 1 page(s) / 54K

Publishing Venue

The IP.com Prior Art Database

Abstract

High solids, low-viscosity styrene-acrylonitrie (SAN) copolymer polyols (CPP) can be produced by using a highly efficient stabilizer obtained by the radical polymerization of a polyol based macromonomer with SAN in an organic solvent.

This text was extracted from a Microsoft Word document.
This is the abbreviated version, containing approximately 52% of the total text.

USE OF SOLVENTS IN DISPERSION POLYMERIZATION

High solids, low-viscosity styrene-acrylonitrile (SAN) copolymer polyols (CPP) can be produced by using a highly efficient stabilizer obtained by the radical polymerization of a polyol based macromonomer with SAN in an organic solvent.  Common solvents like cumene, ethylbenzene, toluene and low molecular weight alkanes, ethers or alcohols can be used in the dispersion polymerization of ethylenically unsaturated monomers in polyether polyols to lower the viscosity of the final dispersion (after removal of the solvent).

This type of dispersion polymerization is usually carried out by free radical polymerization of ethylenically unsaturated monomers in polyether polyols using organic peroxide(s)1 or  azo type2 of radical initiators in combination with a chain transfer agent3.  The solvents can be used as a diluent for the polyether polyol during the free radical polymerization or as the sole carrier to prepare dispersions with low total polymer content, which can subsequently be used as a seed in the final dispersion preparation.  The particles of these dispersions can be so small that the dispersions appears totally transparent or slightly bluish (Tyndall effect). The dispersion polymerization can be carried out in a batch reactor or run in a continuos way using one or more continuos stirred tank reactors in series or in combination with plug flow reactors.  Polymer particle stabilizers can be prepared from a polyether polyol having induced unsaturation by reacting the polyol with an ethylenically unsaturated monomer having a hydrogen reactive group like an carboxylic acid, ester, epoxy, isocyanate or anhydride.  Examples of such stabilizers include maleic anhydride, vinyltrimethoxysilane, hydroxyethylmethacrylate , dimethyl m-isopropenylbenzylisocyanate, glycidyl acrylate or using a ethylenically unsaturated monomers with one or more  active hydrogen atoms, which can be used as a starter produce a polyether polyol.  The polymer particle stabilizer...