Composition for the protection of a shaped article against corrosion
View Patent ↗The invention relates to a composition for the protection of a shaped article against corrosion, said composition comprising (a) a polyisobutene having a glass transition temperature of less than −20° C. and surface tension of less than 40 mM/m at a temperature above the glass transition temperature of said polyisobutene, (b) a filler material and (c) an anti-oxidant composition. The anti-oxidant composition comprises a primary and/or a secondary anti-oxidant, the primary anti-oxidant being selected from the group consisting of sterically hindered phenol compounds. The invention further relates to a wrapping tape comprising said composition for the protection of a shaped article, a process for the manufacture of said wrapping tape and a process for covering a shaped article with said wrapping tape.
1. A wrapping tape for the protection of a shaped article against corrosion, wherein the wrapping tape comprises:
(a) a first layer comprising a film, said film comprising a polymer or a copolymer of one or more α-olefins and/or diolefins; and
(b) a second layer comprising;
a polyisobutene having a glass transition temperature of less than −20° C. and surface tension of less than 40 mN/m at a temperature above the glass transition temperature of said polyisobutene;
a filler material; and
an anti-oxidant composition, wherein said anti-oxidant composition comprises a sterically hindered phenol compound that is not 2,6-di-t-butyl-4-methylphenol.
2. The wrapping tape according to claim 1 , wherein the sterically hindered phenol compound is selected from the group of sterically hindered alkylthiomethylphenol compounds.
3. The wrapping tape according to claim 1 , wherein the sterically hindered phenol compound is selected from the group of sterically hindered arylthiomethylphenol compounds.
4. The wrapping tape according to claim 1 , wherein the anti-oxidant composition further comprises a secondary anti-oxidant selected from the group consisting of phosphites and thioesters.
5. The wrapping tape according to claim 1 , wherein the anti-oxidant composition further comprises a lactone.
6. The wrapping tape according to claim 1 , further comprising a protective layer (c) to protect layer (b).
7. The wrapping tape according to claim 1 , further comprising a reinforcing layer (d) in between layers (a) and (b).
8. The wrapping tape according to claim 7 , wherein the reinforcing layer can be deformed in two essentially orthogonal directions.
9. The wrapping tape according to claim 7 , wherein the reinforcing layer has a woven, knitted or spool-knitted structure.
10. The wrapping tape according to claim 1 , wherein the wrapping tape has a total thickness of about 1.0 cm to about 3.0 cm.
11. The wrapping tape according to claim 1 , wherein the wrapping tape has a width of about 3.0 cm to about 50.0 cm.
12. A process for the manufacturing of a wrapping tape for the protection of a shaped article against corrosion, comprising laminating onto a first layer (a) a composition according to the second layer (b) of claim 1 , said first layer (a) comprising a polymer or a copolymer of one or more α-olefins and/or diolefins.
13. The process according to claim 12 , wherein a protective layer (c) is laminated onto layer (b).
14. The process according to claim 12 , wherein layer (a) and layer (d) are first laminated whereafter a layer (b) is applied to the surface of layer (d) opposite to the surface of layer (d) that is in contact with layer (a).
15. The process according to claim 12 , wherein the wrapping tape is wrapped around a bobbin or a spool.