Heat-sealing compound for sealing aluminium foil and polyethylene terephthalate film to polypropylene, polyvinyl chloride and polystyrene containers

A heat-sealable coating system in the form of a film-forming dispersion and suitable for sealing different kinds of substrates, comprising:

• polymer types, A, B, AB, and C
• optionally the polymer types D or DA, and
• an organic solvent system L,
• wherein
• polymer type A is an olefin polymer or olefin copolymer,
• polymer type B is a (meth)acrylate copolymer containing standard (meth)acrylates and in total up to 15% by weight of methacrylic acid and/or acrylic acid and/or another polymerizable acid, relative to polymer type B,
• polymer type AB is a graft polymer of polymer type A and polymer type B, and
• polymer type C is a polyester or a polyester mixture;
• optionally there is also an addition of polymer type D which is polyvinyl chloride or polymer type DA which is a polyamide, and
• the amount of polymer type A is between 15% and 65% by weight,
• the amount of polymer type B is between 15% and 65% by weight,
• the amount of polymer type AB is between 15% and 70% by weight,
• the amount of polymer type C is between 5% and 50% by weight,
• the amount of polymer type D is between 0% and 10% by weight,
• the amount of polymer type DA is between 0% and 10% by weight, based on the total mass of the polymer types A, B, AB, C, D, and DA,
• and the mass ratio of the total of polymer types A, B, AB, C, D and DA to the mass of the solvent or solvent mixture L is between 5:1 and 1:5.