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 alpha-olefins or diolefins;
(b) a second layer, wherein 40 to 80 weight percent of the second layer comprises a filler selected from the group consisting of inorganic minerals, salts and oxides; and
(c) a reinforcing layer;
wherein the wrapping tape is wrapped around a bobbin or spool.
2. The wrapping tape of claim 1 wherein the reinforcing layer is woven.
3. The wrapping tape of claim 1 wherein the reinforcing layer is knitted.
4. The wrapping tape of claim 1 wherein the reinforcing layer is spool-knitted.
5. The wrapping tape of claim 1 wherein the reinforcing layer comprises polyolefin fibers.
6. The wrapping tape of claim 1 wherein the reinforcing layer comprises polyolefin fibers selected from ethylene homopolymers or copolymers or propene homopolymers or copolymers.
7. The wrapping tape of claim 1 wherein the wrapping tape further comprises a protective layer (d) to protect layer (b).
8. The wrapping tape of claim 1 wherein the polymer of said film in the first layer is selected from the group consisting of EPDM elastomers, ethylene homopolymers, ethylene-alpha-olefin copolymers, propylene homopolymers and propylene-alpha-olefin copolymers.
9. The wrapping tape of claim 1 wherein the second layer comprises a filler selected from the group consisting of chalk, boron sulphate, aluminum oxide, silicon dioxide, limestone, ground quartz, glass, talc, slate, and bentonite.
10. The wrapping tape of claim 1 wherein the second layer comprises a filler which is calcium carbonate.
11. The wrapping tape of claim 1 wherein the second layer comprises a filler which has a density of about 2.0 to about 4.0 kg/dm 3 at 20° C. according to DIN ISO 787/10.
12. The wrapping tape of claim 1 wherein the second layer comprises a filler which has a water solubility of less than 0.1 g/l at 20° C. according to DIN ISO 787/8.
13. The wrapping tape of claim 1 wherein said wrapping tape has a water permeability of 35.5×10 −13 Pa cm/s 2 or less.
14. The wrapping tape of claim 1 wherein said wrapping tape is capable of protecting a pipe spool from holidays according to ASTM G 62 (Method B) at 3000V.
15. The wrapping tape of claim 1 wherein said wrapping tape is stable over a pH range of 2 to 12 for a five week test period at 23° C.
16. The wrapping tape of claim 1 wherein said wrapping tape has an electrical resistance of at least 1.15×10 8 ohm/m 2 .
17. The wrapping tape of claim 1 wherein said wrapping tape has a cathodic disbanding of less than 10 mm according to ASTM G 95.
18. The wrapping tape of claim 1 wherein said wrapping tape has a cathodic disbanding of less than 10 mm according to ASTM G 8.
19. The wrapping tape of claim 1 wherein said wrapping tape can be used within an operating temperature of −50° C. to 85° C.
20. The wrapping tape of claim 1 wherein the first layer has a thickness of from about 10 μm to about 500 μm.
21. The wrapping tape of claim 1 wherein said wrapping tape has a total thickness of about 1.0 to about 3.0 cm and a width of from about 3.0 to about 50.0 cm.
22. The wrapping tape of claim 1 , wherein the second layer is laminated onto the film of said first layer.
23. The wrapping tape of claim 1 , wherein the reinforcing layer is between said first layer and said second layer.
24. The wrapping tape of claim 1 , wherein said film comprising a polymer selected from ethylene homopolymer or ethylene-α-olefin copolymers.
25. 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 selected from ethylene homopolymer or ethylene-α-olefin copolymers;
(b) a second layer which is laminated onto the film of said first layer and comprises:
(i) a polyisobutene having a glass transition temperature of less than −60° C., a surface tension of less than 40 mM/m at a temperature above the glass transition temperature of said polyisobutene, an average molecular weight (Mn) of from about 180 to about 6000 or from 15,000 to 80,000, and a molecular weight distribution (Mw/Mn) of not more than 4; and
(ii) a filler comprising an inorganic mineral; and
(c) a reinforcing layer.
26. The wrapping tape of claim 25 wherein the wrapping tape is wrapped around a bobbin or spool.
27. The wrapping tape of claim 25 wherein the inorganic mineral in the second layer comprises chalk or talc.
28. The wrapping tape of claim 25 wherein the inorganic mineral in the second layer comprises calcium carbonate.
29. The wrapping tape of claim 25 wherein said second layer further comprises an antioxidant.
30. The wrapping tape of claim 25 wherein the reinforcing layer is between layers (a) and (b).
31. The wrapping tape of claim 25 wherein the reinforcing layer comprises polyolefin fibers.
32. A wrapping tape for the protection of a shaped article against corrosion, wherein the wrapping tape comprises:
(a) a first layer comprising a film;
(b) a second layer which is laminated onto the film of said first layer and comprises:
(i) a polyisobutene having a glass transition temperature of less than −60° C., a surface tension of less than 40 mM/m at a temperature above the glass transition temperature of said polyisobutene, an average molecular weight (Mn) of from about 300 to about 2,500,000, and a molecular weight distribution (Mw/Mn) of not more than 4;
(ii) a filler comprising an inorganic material with a water solubility of less than 0.1 g/l at 20° C. according to DIN ISO 787/8; and
(iii) a sterically hindered phenol compound; and
(c) a reinforcing layer.
33. The wrapping tape of claim 32 wherein the wrapping tape is wrapped around a bobbin or spool.
34. The wrapping tape of claim 32 wherein the inorganic mineral in the second layer comprises chalk or talc.
35. The wrapping tape of claim 32 wherein the inorganic mineral in the second layer comprises calcium carbonate.
36. The wrapping tape of claim 32 wherein said second layer further comprises an antioxidant.
37. The wrapping tape of claim 32 wherein the reinforcing layer is between layers (a) and (b).
38. The wrapping tape of claim 32 wherein the reinforcing layer comprises polyolefin fibers.
39. The wrapping tape of claim 1 , wherein the second layer is capable of being deformed.
40. The wrapping tape of claim 1 , wherein the second layer comprises a polyisobutene having a glass transition temperature of less than −20° C.
41. The wrapping tape of claim 25 , wherein the second layer is capable of being deformed.
42. The wrapping tape of claim 32 , wherein the second layer is capable of being deformed.