Process for protecting objects made of rubber and products used

摘要

A rubber article is protected by applying to its surface a paste made up of a thickened ester of a polyhydric alcohol and an aliphatic carboxylic acid with an ozone eliminator, the ester possessing at least one hydroxyl group or group of the formula R,CO where R is a hydrocarbon radical or hydrogen. The polyhydric alcohol may be a glycol or glycerol, and suitable aliphatic acids are ricinoleic, hydroxybutyric, and lactic acids. The preferred esters are the mono- and di-glycerides and the glycol esters of ricinoleic acid, and these may be provided by the inclusion of thickened castor oil in the paste. The castor oil may be thickened by heating with a hydroxide of an alkaline earth metal, e.g. barium hydroxide, or with aluminium or zinc stearate, calcium or magnesium oleate, or lauric or stearic acid. An acylated castor oil, e.g. acetylated castor oil, may be used after thickening by mixing with a metal salt of naphthenic acid, e.g. aluminium naphthenate. The ozone eliminator may consist of whiting, French chalk, colloidal clay, magnesium carbonate or oxide, zinc oxide, aluminium naphthenate, sawdust, or a diarylamine. The paste may include other ingredients such as pigments, dyes, and solvents.ALSO:A rubber article is protected by applying to its surface a paste made up of a thickened ester of a polyhydric alcohol and an aliphatic carboxylic acid with an ozone eliminator, the ester possessing at least one hydroxyl group or group of the formula R.CO where R is a hydrocarbon radical or hydrogen. The polyhydric alcohol may be a glycol or glycerol, and suitable aliphatic acids are ricinoleic, hydroxybutyric, and lactic acids. The preferred esters are the mono- and di-glycerides and the glycol esters of ricinoleic acid, and these may be provided by the inclusion of thickened castor oil in the paste. The castor oil may be thickened by heating with a hydroxide of an alkaline earth metal, e.g. barium hydroxide or with aluminium or zinc stearate, calcium or magnesium oleate, or lauric or stearic acid. An acylated castor oil, e.g. acetylated castor oil, may be used after thickening by mixing with a metal salt of naphthenic acid e.g. aluminium naphthenate. The ozone eliminator may consist of whiting, French chalk, colloidal clay, magnesium carbonate or oxide, zinc oxide, aluminium naphthenate, sawdust or a diarylamine. The paste may include other ingredients such as pigments, dyes, and solvents.