GB1433064A - Thermosettable synthetic addition polymers - Google Patents

Abstract

1433064 Production of thermosetting polymer dispersions CANADIAN INDUSTRIES Ltd 1 Feb 1974 [1 Nov 1973] 04697/74 Heading C3P The process of Specification 1,417,713 for producing a thermosetting aqueous dispersion by polymerizing in water at least one α,#- ethylenically unsaturated main monomer which is very slightly soluble in water, with at least one α,#-ethylenically unsaturated monomer containing a reactive group, in the presence of a surfactant, suspending agent or mixture thereof, and also in the presence of at least one modifier containing a complementary reactive group and which is a plasticizer selected from mono epoxy compounds epoxy resins, melamineformaldehyde resins and ureaformaldehyde resins, is modified by including in the monomer mixture a monomer selected from water soluble salts of vinyl sulphonate and of allyl sulphonate, and sulpho-esters or salts thereof of the formula wherein R is a vinyl or alpha-substituted vinyl group, Q is a divalent hydrocarbon group having its valence bonds on different carbon atoms and M is a hydrogen ion or a cation selected from Na, K, Li, ammonium or substituted ammonium groups NR<SP>1</SP> 4 wherein each R<SP>1</SP> is H, C 1-4 alkyl, or C 1-3 alkanolamine, or where two R<SP>1</SP> groups and the nitrogen atom represent together a morpholine residue, and the remaining R<SP>1</SP> groups are as already defined. A long list of such monomers is given. An example of the monoepoxy plasticizer/modifier is, the reaction product of epichlorohydrin and a C 9-11 mixture of saturated tertiary alpha carbon atom carboxylic acids. Some of the reactive modifier may be replaced by a non-reactive modifier such as a monomeric ester, polymeric ester and polyalkylene glycols. The polymerized dispension may also be mixed with an external cross-linking agent containing at least two complementary reactive groups, and also, if desired, a water soluble resin. Examples of main monomers are styrene, C 1-4 alkyl methacrylates, -acrylates, -itaconates, -maleates, and -fumarates, vinyl esters, and vinyl chloride. Examples of monomers containing reactive groups are acrylic-, methacrylic-, itaconic-, maleic- and fumaric acids, acrylamide and its C 1-4 substituted derivatives, N-alkoxy acrylamides, diacetone acrylamide, maleamic acid, maleamide, fumaramide, N-mono-alkyl/aryl substituted amides, hydroxyethyl methacrylate and hydroxy-propyl methacrylate.