Release agent based on ethylene multi-block copolymer
View Patent ↗Release agent more particularly for an adhesive with an ethylene multi-block copolymer, the ethylene multi-block copolymer being composed of hard segment blocks, comprising at least 95% (w/w) ethylene and a comonomer, and of soft segment blocks, comprising ethylene and a comonomer, the fraction of comonomer in the soft segment blocks being between 10 and 20 mol %, and the fraction of the hard segment blocks in the ethylene multi-block copolymer being not more than 45% (w/w).
1. A release agent comprising an ethylene multi-block copolymer, the ethylene multi-block copolymer comprising hard segment blocks and soft segment blocks, said hard segment blocks comprising at least 95% (w/w) ethylene and a comonomer, and said soft segment blocks comprising ethylene and a comonomer, wherein the fraction of comonomer in the soft segment blocks is between 10 and 20 mol %, and the fraction of the hard segment blocks in the ethylene multi-block copolymer is not more than 45% (w/w).
2. The release agent according to claim 1 , wherein the hard segment blocks have a crystallite melting point of at least 110° C.
3. The release agent according to claim 1 wherein the ethylene multi-block copolymer is produced by chain-shuttling polymerization.
4. The release agent according to claim 1 wherein the comonomer is a C 3 to C 10 olefin.
5. The release agent according to claim 1 wherein the fraction of the hard segment blocks in the ethylene multi-block copolymer is not more than 35% (w/w).
6. The release agent according to claim 4 wherein the comonomer is a C 8 olefin.
7. A release film comprising a release agent according to claim 1 .
8. An adhesive tape comprising a carrier material, an adhesive provided on one side of the carrier material, and a coherent release layer on a side the carrier material opposite the adhesive, wherein the release layer comprises a release agent according to claim 1 .
9. The adhesive tape according to claim 8 wherein the release layer comprises at least 70% by weight of the release agent.
10. The adhesive tape according to claim 8 wherein the adhesive is a pressure sensitive adhesive.
11. The adhesive tape according to claim 10 wherein the pressure sensitive adhesive is an acrylate adhesive.