Heat-Sealing Material for Aluminum Foils and Polyethylene Terephthalate Foils Against Polypropyl, Polyvinyl Chloride, and Polystyrol Containers

2:

• The heat-sealable coating system according to claim 1 suitable for the sealing of various types of substrate, characterized in that a polymer type C is present and is an olefin polymer or is an olefin copolymer, and a polymer type CB is present and is a graft polymer composed of polymer type C and polymer type B.

3:

• The heat-sealable coating system according to claim 2 suitable for the sealing of various types of substrate, characterized in that the amount of polymer type C is from 5% by weight to 60% by weight and the amount of polymer type CB is from 5% by weight to 60% by weight, based on the total weight of the polymer types A, B, AB, C and BC, and that the ratio by weight of the entirety of the polymer types A, B, AB, C and BC to the weight of the solvent or of the solvent mixture L is from 5:1 to 1:5.

4:

• The heat-sealable coating system according to claim 1 suitable for the sealing of various types of substrate, characterized in that polymer type A is a polyester whose preparation involves copolymerization of itaconic acid.

5:

• The heat-sealable coating system according to claim 4 suitable for the sealing of various types of substrate, characterized in that polymer type A is a polyester whose proportion of itaconic acid, based on the total amount of polycarboxylic acids used, is from 0.1 mol % to 20 mol %.

6:

• The heat-sealable coating system according to claim 5 suitable for the sealing of various types of substrate, characterized in that polymer type A is a polyester whose proportion of itaconic acid, based on the total amount of polycarboxylic acids used, is from 2 mol % to 8 mol %.

7:

• The heat-sealable coating system according to claim 4 suitable for the sealing of various types of substrate, characterized in that the polymer type AB is a graft copolymer having a polyester main chain and poly(meth)acrylate side chain.

8:

• The heat-sealable coating system according to claim 4 suitable for the sealing of various types of substrate, characterized in that simultaneous presence of a polymer of type A and of an initiator is involved in polymerization of monomers which lead to component B.

9:

• The heat-sealable coating system according to claim 4 suitable for the sealing of various types of substrate, characterized in that reaction of the initiator with double bonds of itaconic acid repeat units in the polymer of type A forms reactive centres for free-radical polymerization of (meth)acrylates and these react further to give graft copolymers AB.

10:

• The heat-sealable coating system according to claim 4 suitable for the sealing of various types of substrate, characterized in that polymer type B is grafted simultaneously onto polymer type A and polymer type C in order to prepare the graft copolymers AB and CB.

11:

• The heat-sealable coating system according to claim 4 suitable for the sealing of various types of substrate, characterized in that a polymer type C is present and is an olefin polymer or is an olefin copolymer, and a polymer type CB is present and is a graft polymer composed of polymer type C and polymer type B.

12:

• The heat-sealable coating system according to claim 4 suitable for the sealing of various types of substrate, characterized in that the amount of polymer type C is from 5% by weight to 60% by weight and the amount of polymer type CB is from 5% by weight to 60% by weight, based on the total weight of the polymer types A, B, AB, C and BC, and that the ratio by weight of the entirety of the polymer types A, B, AB, C and BC to the weight of the solvent or of the solvent mixture L is from 5:1 to 1:5.

13:

• The heat-sealable coating system according to claim 4 suitable for the sealing of various types of substrate, characterized in that a polymer type D is present and is a polyvinyl chloride and/or
• a polymer type DA is present and is a polyamide.

14:

• The heat-sealable coating system according to claim 13 suitable for the sealing of various types of substrate, characterized in that the amount of polymer type D is from 0.1% by weight to 10% by weight and the amount of polymer type DA is from 0.1% by weight to 10% by weight, based on the total weight of the polymer types A, B, AB, D and DA, and that the ratio by weight of the entirety of the polymer types A, B, AB, D and DA to the weight of the solvent or of the solvent mixture L is from 5:1 to 1:5.

16:

• The heat-sealable coating system according to claim 1 suitable for the sealing of various types of substrate, characterized in that the material comprises auxiliaries and additives which are conventional for the heat-sealing process.

17:

• A process for the sealing of heat-sealable substrates, characterized in that a coating system according to claim 1 is used.

18:

• The process according to claim 17 for the sealing of polyester foil or of PET-coated foil with respect to polystyrene, polyester and polyvinyl chloride.

19:

• The process according to claim 17 for the sealing of polyester foil or aluminium foil or of aluminium- or PET-coated foils with respect to polystyrene, polyester and polyvinyl chloride using a coating system characterized in that polymer type A is a polyester whose preparation involves copolymerization of itaconic acid and that a polymer type D is present and is a polyvinyl chloride and/or a polymer type DA is present and is a polyamide.

21:

• A method for the heat sealing of polyester foil or of aluminium- or PET-coated foils with respect to polystyrene, polyester and polyvinyl chloride using the coating system according to claim 1.

22:

• A method for the heat sealing of aluminium foil or polyester foil or of aluminium- or PET-coated foils with respect to polystyrene, polyester and polyvinyl chloride using the coating system according to claim 1 characterized in that polymer A is a polyester whose preparation involves copolymerization of itaconic acid and that a polymer D is present and is a polyvinyl chloride and/or a polymer DA is present and is a polyamide.