Moulding mass made from vinyl chloride polymer or...

C - Chemistry – Metallurgy – 08 – L

Patent

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Details

C08L 27/06 (2006.01) C08J 5/18 (2006.01) C08L 67/02 (2006.01)

Patent

CA 2595964

The invention relates to a moulding mass made from vinyl chloride polymer or polyvinylchloride at 5 to 94 wt. % and a K value of 50 to 90, additives at 2 to 25 wt. % and a polymer, whereby the weight percentages relate to the total weight of the moulding mass. The polymer is a semi-crystalline or amorphous polyester. The vinyl chloride polymer or polyvinylchloride in powder, pellet or granular form is mixed with the additives and the semi-crystalline or amorphous polyester in powder, pellet or granular form. The film is produced from said moulding mass by plastifying and fusing the same and calendering or extruding the same to give a film with a thickness of 100 ~m to 1 mm. By means of subsequent in-line or off-line method steps, said film, for example, by means of drawing with a drawing degree of 1.3 to 7, in particular, of 3 to 4 can be further processed to give a thin high-shrinkage film.

L'invention concerne une matière moulable contenant 5 à 94 % en poids d'un polymérisat de chlorure de vinyle ou de chlorure de polyvinyle, ayant une valeur K variant entre 50 et 90, ainsi que 2 à 25 % en poids d'additifs et un polymère, les pourcentages en poids se rapportant au poids total de la matière moulable. Le polymère est un polyester semi-cristallin ou amorphe. Selon l'invention, le polymérisat de chlorure de vinyle ou le chlorure de polyvinyle sous forme de poudre, de boulettes ou de granulat est mélangé aux additifs et le polyester semi-cristallin ou amorphe est ajouté à la matière sous forme de poudre, de boulettes ou de granulat. Pour réaliser une pellicule à base de cette matière moulable, cette dernière est plastifiée, fondue puis calandrée ou extrudée en une pellicule de 100 ?m à 1 mm d'épaisseur. Les opérations suivantes en ligne ou autonomes permettent de façonner cette pellicule en une pellicule plus mince à retrait élevé, par ex., par étirage à un taux d'étirage de 1,3 à 7, notamment de 3 à 4.

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