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Prticulate Carbonates And Their Preparation And Use In Thermoplastic Film Compositionsa
Abstract: A method of producing a breathable film which comprises the steps of : (a) producing an inorganic particulate filler by treating particles of an alkaline particulate material copmprising an alkaline earth metal carbonate compound by reaction with a hydrophobising surface treatment agent comprising one or more aliphatic carboxylic acideds having at least 10 chain carbon atoms to produce hydrophobic coating on the particles under conditions such that the inorganic filler produced has a total surface moisture level comprising moisture adsorbed on the particles and trapped within the hydrophobic coating thereon of not greater than 0.1% by weight based on the dry weight of the dry weight of the inorganic particulate material; (b) producting a filled thermoplastic composition by mixing the inorganic filler produced in step (a) with a heated thermoplastic polymer; and shaping the composition produced in step (b) by heat processing to form a film product.
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