Patent GB-859027-A (GB)
Title: Heat-sensitising agents
IPC: C08G75/12
Filed: 1958-09-01
Abstract: Latices of high molecular weight compounds, e. g. natural rubber, elastomeric polymers from butadiene, dimethyl butadiene and isoprene and copolymers of these with styrene, a -methyl styrene, acrylonitrile, methacrylonitrile, acrylates and methacrylates, poly-2-chlorobutadiene, copolymers of isoolefines such as isobutylene with small amounts of conjugated diolefines, polyvinyl acetate, polyacrylic acid esters, and polyvinyl chloride, are rendered heat-sensitive by the incorporation of polyether thioethers, preferably in the proportion 1-10% based on the weight of high mol. wt. compound.  The polyether thioethers employed preferably contain at least one ether oxygen to 3 or 4 carbon atoms, and, also, at least one additional ether oxygen bond to each thioether bond; polyether thioethers of mol. wt. 500-20,000 are preferred.  The polyether thioethers may be used in the form of their glycols, e.g. the reaction products of 1 mol of thiodiglycol with 0,9 mol of tetraethylene glycol, 0,35 mol of octaethylene glycol, 0,48 mol of octaethylene glycol, 0,55 mol of octaethylene glycol, 0,55 mol of decaethylene glycol monobutyl ether, and 0,5 mol of dodecaethylene glycol, the reaction product of 1 mol of ethylene glycol, 40 mols of ethylene oxide and 9 mols of ethylene sulphide, the reaction product of 1 mol of butane diol, 80 mols of ethylene oxide and 20 mols of ethylene sulphide, and the reaction product of 1 mol of ethylene glycol, 40 mols of ethylene oxide, 8 mols of ethylene sulphide and 3 mols of propylene oxide.ALSO:Polyether thio ethers, utilisable in heat-sensitising organic latices (see Group IV (a)) are prepared, according to one method, by reacting a polyether glycol of the general formula HO-(CH2CH2O)m-R-O-(CH2CH2O)nH, wherein R is an alkylene, cycloalkylene or arylene radical which may bear hydroxyl or oxyalkylated hydroxyl groups and m and n are integers the sum of which is from 6-200, with a thio-ether glycol of the general formula HO-(CHR1.CHR2-S-CHR3. CHR4O)p-H wherein the Rs represent hydrogen or alkyl, cycloalkyl or aryl radicals and p is an integer from 1 to 200; preferably reaction is effected at about 140-220 DEG  C., in the presence of a dehydration catalyst.  Specified reactants include octa ethylene glycol and poly oxyethylated butane diol, trimethylol propane, hydroquinone and resorcinol, and thio diglycol, b /b 1-dimethyl thio diglycol and b /b 1-diphenyl-thio diglycol.  The reaction mixture may contain an alcohol such as ethanol, oleyl alcohol, glycerol or pentaerythritol, which condenses with the other reactants. Alternatively, polyether thio ethers may be prepared by copolymerising an alkylene oxide, such as ethylene, propylene, cyclo-hexene or styrene oxide, with an alkylene sulphide and, if desired, a mono-or polyhydric alcohol or oxy alkylation product thereof.  The polyether thio ethers may be esterified with aliphatic or aromatic acids or acid chlorides or anhydrides, etherified by reaction with alcohols in the presence of dehydration catalysts or converted into urethanes by reaction with iso-cyanates or iso-thio cyanates; they may also be reacted with acrylo nitrile, vinyl ethyl sulphone or butadiene sulphone. Examples are given.