Polyolefin graft poly(meth)acrylate copolymer-based adhesion promoter for coating polyolefin surfaces
View Patent ↗The invention relates to a novel halogen-free and acid-free, readily soluble adhesion promoter for polyolefins, said promoter containing (meth)acrylate-grafted, amorphous polyolefins.
1. An adhesion promoter comprising
a polymer type A, a polyolefin or a polyolefin mixture,
a polymer type B, a (meth)acrylate homo- or/and copolymer comprising standard methacrylates and/or standard acrylates, and
a polymer type AB, a graft copolymer made of polymer type A and polymer type B,
wherein the adhesion promoter is in the form of a melt, a dispersion, or a solution and is halogen-free and acid-free,
wherein polymer type B and polymer type AB have silyl groups,
wherein the polymer type AB is a graft copolymer having a polyolefin main chain and poly(meth)acrylate side chains.
2. The adhesion promoter as claimed in claim 1 , wherein the adhesion promoter is a polymer solution comprising a solvent, wherein the ratio by mass of the entirety of polymer types A, B, and AB to the mass of the solvent is from 3:1 to 1:3, and the solvent comprises no aromatics.
3. The adhesion promoter as claimed in claim 1 , wherein the adhesion promoter is in the form of a melt.
4. The adhesion promoter, as claimed in claim 1 , wherein polymer type A comprises at least one of an atactic polypropylene, an atactic poly-1-butene, and a co- and/or a 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.
5. The adhesion promoter as claimed in claim 4 , wherein the polymer type A comprises one or more α-olefins having from 4 to 20 carbon atoms selected from the group consisting of 1-butene, 1-pentene, 1-hexene, 1-octene, 1-decene, 1-dodecene, 3-methyl-1-butene, a methylpentene, 4-methyl-1-pentene, a methylhexene, and a methylheptene.
6. The adhesion promoter as claimed in claim 1 , wherein the polymer type A 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 polymer type B comprises reacted units of methyl methacrylate and n-butyl acrylate.
7. The adhesion promoter as claimed in claim 6 , wherein the polymer type B further comprises reacted units of 3-methacryloyloxypropyltrimethoxysilane.
8. The adhesion promoter as claimed in claim 1 , wherein the polymer type B and the polymer type AB comprise reacted units of a methacryloyloxy alkyl trialkoxysilane.
9. The adhesion promoter of claim 8 wherein a ratio of the total amount of a polyolefin component and the total amount of a poly(meth)acrylate component is 30:70 to 40:60.
10. The adhesion promoter as claimed in claim 9 , wherein the polyolefin component comprises reacted monomer units including ethene in an amount of from 0 to 5.1%, propene in an amount of from 24 to 84.5%, and 1-butene in an amount of from 12 to 74%.
11. An adhesive formulation for the adhesive bonding of polyolefin substrates, wherein the adhesive comprises an adhesion promoter as claimed in claim 1 .
12. A coating formulation comprising an adhesion promoter as claimed in claim 1 .
13. A sealant formulation comprising an adhesion promoter as claimed in claim 1 .
14. A primer comprising an adhesion promoter as claimed in claim 1 .
15. The formulation as claimed in claim 11 , wherein the formulation is free from solvents.
16. The formulation as claimed in claim 11 , wherein the formulation comprises water as solvent.
17. A foil, molding, tube, or cable sheathing coated with a formulation as claimed in claim 15 .