Polyolefin graft poly(meth)acrylate copolymer-based priming agent for polyolefin surfaces

1. A primer, comprising a film-forming dispersion or solution, comprising:

an A polymer, which comprises a polyolefin or a polyolefin mixture;

a B polymer, which comprises at least one member selected from the group consisting of a (meth)acrylate homopolymer and a (meth)acrylate copolymer, comprising at least one member selected from the group consisting of a standard methacrylate and a standard acrylate; and

an AB polymer, which comprises a graft copolymer comprising the A polymer and the B polymer,

wherein the film-forming dispersion or solution is halogen-free and acid-free; and

wherein the primer is suitable for coating at least one polyolefin,

wherein the B polymer and the AB polymer have silyl groups,

wherein the AB polymer is a graft copolymer comprising a polyolefin main chain and at least one poly(meth)acrylate side chain.

2. The primer of claim 1 , further comprising a solvent, wherein a ratio by mass of all of the A, B, and AB polymers to a mass of the solvent or solvent mixture is from 3:1 to 1:3.

3. The primer of claim 2 , wherein the solvent or the solvent mixture comprises no aromatics.

4. The primer of claim 1 , wherein a ratio by mass of all of the A, B, and AB polymers to a mass of a solvent or solvent mixture is from 2:1 to 1:2.

5. The primer of claim 1 , wherein the A polymer comprises at least one member selected from the group consisting of an atactic polypropylene, atactic poly-1-butene, and a copolymer or terpolymer of the following monomer constitution:

from 0 to 95% by weight of one or more α-olefins having from 4 to 20 carbon atoms;

from 5 to 100% by weight of propene; and

from 0 to 50% by weight of ethene.

6. The primer of claim 5 , wherein at least one member is a copolymer or a terpolymer and where the α-olefins having from 4 to 20 carbon atoms comprise at least one member selected from the group consisting of 1-butene, 1-pentene, 1-hexene, 1-octene, 1-decene, 1-dodecene, 3-methyl-1-butene, a methylpentene, a methylhexene, and a methylheptene.

7. The primer of claim 5 , wherein the A polymer comprises at least one member selected from the group consisting of the copolymer and the terpolymer,

wherein of the monomer constitution of the at least one member is:

from 3 to 95% by weight of one or more α-olefins having from 4 to 20 carbon atoms;

from 5 to 100% by weight of propene; and

from 0 to 50% by weight of ethene.

8. The primer of claim 5 , wherein the A polymer comprises at least one member selected from the group consisting of the copolymer and the terpolymer,

wherein of the monomer constitution of the at least one member is:

from 0 to 95% by weight of one or more α-olefins having from 4 to 20 carbon atoms;

from 5 to 100% by weight of propene; and

from 0 to 20% by weight of ethene.

9. The primer of claim 5 , wherein the A polymer comprises at least one member selected from the group consisting of the copolymer and the terpolymer,

wherein of the monomer constitution of the at least one member is:

from 3 to 95% by weight of one or more α-olefins having from 4 to 20 carbon atoms;

from 5 to 97% by weight of propene; and

from 0 to 50% by weight of ethene.

10. The primer of claim 5 , wherein the A polymer comprises at least one member selected from the group consisting of the copolymer and the terpolymer,

wherein of the monomer constitution of the at least one member is:

from 3 to 95% by weight of one or more α-olefins having from 4 to 20 carbon atoms;

from 5 to 97% by weight of propene; and

from 0 to 20% by weight of ethene.

11. The primer as claimed in claim 1 , wherein the B polymer comprises reacted units of a (meth)acryloyloxyalkyltrialkoxysilane.

12. The primer as claimed in claim 1 , wherein the B polymer comprises reacted units of 3-methacryloyloxypropyltrimethoxysilane.

13. The primer as claimed in claim 1 , wherein the A polymer is a polyolefin comprising from 24 to 84.5% propene, from 12 to 74% 1-butene and from 0 to 5.1% ethene; and the B polymer comprises reacted units of methyl methacrylate, n-butyl acrylate, and 3-methacryloyloxypropyltrimethoxysilane.

14. A process for priming a polyolefin substrate, comprising:

applying the primer of claim 1 in the form of solution to the substrate; and

drying the primer.

15. The process of claim 14 , further comprising:

applying a second layer to a primer layer.

16. The process as claimed in claim 15 , wherein the second layer comprises a coating, an adhesive, or a sealant.

17. A foil, molding, tube, or cable sheathing, coated by the process of claim 14 .

18. A process for priming a polar substrate, comprising:

applying the primer of claim 1 in the form of solution to the substrate;

then drying the primer, to obtain a primer layer; and

applying a second layer which mainly comprises at least one polyolefin to the primer layer.

19. The process of claim 18 , wherein the second layer comprises an adhesive or a sealant.

20. A foil, molding, tube, or cable sheathing, coated by the process of claim 18 .