| 摘要 |
Polyester resins are formed by reaction of a 2,4,6 - trioxo - s - triazine - 1,3,5 - (2H,4H,6H)-trialkanoic acid and a polyhydric alcohol. Curing agents which may be included are bishydroxymethyl urea, hexamethoxymethylmelamine, trihydroxymethyl - melamine, dihydroxymethyl ethylene-urea, methylene bisacrylamine, divinyl sulphone, or acrylic or methacrylic anhydride. The acid component may be the triacetic or tripropionic acid; the alcohol may be ethylene glycol, diethylene glycol, 1,3-propanediol, 1,2-propanediol, triethylene and tetraethylene glycol, 1,4-butanediol, 1,5-pentanediol, neopentyl glycol, 1,6-hexanediol, pentaerythritol, glycerol, trishydroxymethyl - ethane, trishydroxymethyl-propane, dipentaerythritol, sorbitol or xylitol. Dicarboxylic acids such as succinic, maleic, glutaric, adipic, suberic or azelaic and alkyl-substituted derivatives thereof, or terephthalic or 1,4-cyclohexane-dicarboxylic acid, and monocarboxylic acids such as tall oil fatty acids may be included in the reaction mixture. The product may be dissolved in aqueous ammonia, or an alcohol, ketone or ester solvent to form a composition for coating polythene bottles to render them impermeable to organic liquids.ALSO:Solid olefin polymers are coated with a polyester formed from a 2,4,6-trioxo-s-triazine-1,3,5(2H,4H,6H)-trialkanoic acid and a polyhydric alcohol. The coating may be applied in aqueous or organic solvent solution by spraying or dipping, and cured by heating; as curing agent, a methoxymethyl-melamine, an acrylic compound or divinyl sulphone may be included. The olefin polymer which may be in the form of a bottle, drum liner, toy, electrical component, automotive part or houseware may be flamed before coating. |
