Molding composition based on vinyl chloride polymers, and process for the manufacture of films from these molding compositions for the production of forgery-proof valuable documents
AssigneeHeochst Aktiengesellschaft
InventorsBernhard Wottka, Alfred Weindl
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Abstract
The novel molding compositions with vinyl chloride polymer as the main constituent contain, in a specific quantity in each case, certain impact strength modifiers, polymethyl methacrylate and a special cellulose, namely powdered pure cellulose having a mean degree of polymerization of 300 to 1,000 and a maximum particle diameter of 0.09 mm. These molding compositions can readily be calendered. The films are particularly suitable for the production of forgery-proof valuable documents which can be personalized by means of a laser, for example credit cards.
Claims4
A molding composition based on vinyl chloride polymers, for the manufacture of films for the production of forgery-proof valuable documents, consisting essentially of
- A. 5 to 20% by weight of an impact strength modifier for vinyl chloride polymers, selected from the group comprising the acrylonitrile/butadiene/styrene polymers, methyl methacrylate/butadiene/styrene polymers, methyl methacrylate/acrylonitrile/butadiene/styrene polymers, each of said polymers having a butadiene content of at least about 35% by weight relative to the total polymer, and chlorinated ethylene polymer, said chlorinated ethylene polymer having a chlorine content of about 20 to 50% by weight relative to the chlorinated ethylene polymer and having a mean molecular weight of about 10,000 to 100,000 when calculated from the chlorine content and the molecular weight of the starting ethylene polymer as determined by gel chromotography;
- B. 0.5 to 25% by weight of powdered pure cellulose which has a mean degree of polymerization of 300 to 1,000 and the particles of which have a maximum diameter of 0.09 mm;
- C. 1 to 5% by weight of polymethyl methacrylate;
- and
- D. vinyl chloride polymer having at least about 70% by weight polymerized vinyl chloride units relative to the weight of the polymer, in such a quantity that the sum of the weights of said components A, B, C and D gives 100% by weight;
- and additionally
- E. about 0.1 to 2.5% by weight of lubricant and about 0.5 to 3% by weight of heat stabilizer for said vinyl chloride polymer, both relative to the quantity by weight of said component D.
Dependencies are inferred from the claim text.