Particulate carbonates and their preparation and use in...

C - Chemistry – Metallurgy – 08 – K

Patent

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Details

C08K 3/26 (2006.01) C08J 5/18 (2006.01) C08K 9/04 (2006.01) C08K 13/06 (2006.01)

Patent

CA 2303812

A method of producing a breathable film which comprises the steps of: (a) producing an inorganic filler by treating particles of an inorganic particulate material comprising an alkaline earth metal carbonate compound by reaction with a hydrophobising surface treatment agent comprising one or more aliphatic carboxylic acids having at least 10 chain carbon atoms to produce a 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 inorganic particulate material; (b) producing 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.

L'invention concerne un procédé de production d'un film imper-respirant, le procédé consistant: (a) à produire une matière de remplissage inorganique en traitant des particules d'une matière inorganique particulaire comprenant un composé de carbonate métallique alcalino-terreux par mise en réaction avec un agent de traitement de surface à propriété hydrophobe comportant un ou plusieurs acides carboxyliques aliphatiques qui présentent au moins 10 chaînes d'hydrocarbones, afin de produire un revêtement hydrophobe sur les particules dans des conditions telles que la matière de remplissage produite possède un niveau d'humidité superficielle, y compris l'humidité adsorbée sur les particules et piégée dans le revêtement hydrophobe les recouvrant, ne dépassant pas 0,1 % en poids sur la base du poids à sec de la matière particulaire inorganique; (b) à produire une composition thermoplastique avec charge en mélangeant la matière de remplissage inorganique produite à la phase (a) avec un polymère thermoplastique chauffé; puis à mettre en forme la composition produite à la phase (b) par traitement à chaud pour former un produit en film.

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