COMPOSITION FOR THE PROTECTION OF A SHAPED ARTICLE AGAINST CORROSION
The present invention is directed to a composition for the protection against corrosion of an article, wherein the corrosion protecting composition comprises: (i) an amorphous polymer composition comprising one or more polyisobutenes each having a glass transition temperature of −40° C. or less as determined by differential scanning calorimetry (DSC); (ii) one or more butyl rubbers; (iii) one or more antioxidants; and (iv) one or more filler materials, wherein the one or more polyisobutenes are independently selected from the group consisting of low-molecular weight polyisobutenes (LMW PIB) having an average molecular weight Mv in the range of about 500 to about 20,000, and mid-molecular weight polyisobutenes (MMW PIB) having an average molecular weight Mv in the range of about 20,000 to about 120,000.
1 . A corrosion protection composition comprising:
(i) an amorphous polymer composition comprising one or more polyisobutenes each having a glass transition temperature of −40° C. or less as determined by differential scanning calorimetry (DSC);
(ii) one or more butyl rubbers;
(iii) one or more antioxidants; and
(iv) one or more filler materials,
wherein the one or more polyisobutenes are independently selected from the group consisting of low-molecular weight polyisobutenes (LMW PIB) having an average molecular weight Mv in the range of about 500 to about 20,000, and mid-molecular weight polyisobutenes (MMW PIB) having an average molecular weight Mv in the range of about 20,000 to about 120,000.
2 . The corrosion protection composition of claim 1 , wherein the corrosion protection composition comprises:
at least one LMW PIB, or
at least one MMW PIB and one or more butyl rubbers in a total amount of at most 10 wt. %, or
at least one MMW PIB and at most one butyl rubber, and/or
the one or more butyl rubbers have a Mooney viscosity (1+8) at 125° C.<55 MU according to ISO 289.
3 . The corrosion protection composition of claim 1 , wherein the one or more PIB are selected from the group consisting of
a) polyisobutenes having a number average molecular weight Mn of 500-5.000;
b) polyisobutenes having a viscosity average molecular weight Mv of 5.000-20.000;
c) polyisobutenes having a viscosity average molecular weight Mv of 20.000-35.000;
d) polyisobutenes having a viscosity average molecular weight Mv of 35.000-45.000;
e) polyisobutenes having a viscosity average molecular weight Mv of 45.000-55.000;
f) polyisobutenes having a viscosity average molecular weight Mv of 55.000-65.000;
g) polyisobutenes having a viscosity average molecular weight Mv of 65.000-75.000;
h) polyisobutenes having a viscosity average molecular weight Mv of 75.000-85.000; and
i) polyisobutenes having a viscosity average molecular weight Mv of 85.000-120.000.
4 . The corrosion protection composition of claim 1 , wherein the one or more PIB are present in an amount of 10 to 70 wt. % based on the overall weight of the corrosion protection composition.
5 . The corrosion protection composition of claim 1 , wherein the one or more butyl rubbers are present in an amount of 5 to 25 wt. % based on the overall weight of the corrosion protection composition.
6 . The corrosion protection composition of claim 1 , wherein the one or more antioxidants comprise one or more primary and one or more secondary antioxidants, the one or more primary antioxidants comprise sterically hindered phenol compounds, sterically hindered alkylthiomethylphenol or arylthiomethylphenol compounds, and secondary aromatic amines provided that the sterically hindered phenol compound is not 2,6-di-t-butyl-4-methylphenol, and wherein the antioxidants are present in an amount of up to 5 wt. % based on the total weight of the corrosion protection composition.
7 . The corrosion protection composition of claim 6 , wherein the sterically hindered phenol compound comprises at least two sterically hindered phenol groups, and/or wherein the secondary anti-oxidant is selected from the group consisting of phosphites and thioesters.
8 . The corrosion protection composition of claim 6 , wherein the anti-oxidant composition further comprises a lactone.
9 . The corrosion protection composition of claim 1 , wherein one or more filler materials are present in an amount of 25 to 70 wt. %, based on the total weight of the corrosion protection composition.
10 . Wrapping tape for the protection of an article, comprising (a) a first layer, and (b) a second layer comprising the corrosion protection composition according to claim 1 .
11 . The wrapping tape of claim 10 , wherein the first layer is a film comprising a polymer or a copolymer of one or more a-olefins and/or diolefins.
12 . Process for the manufacturing of a wrapping tape, wherein a corrosion protection composition is laminated onto a film, said film comprising a polymer or a copolymer and said corrosion protecting composition comprising:
(i) an amorphous polymer composition comprising one or more polyisobutenes each having a glass transition temperature of −40° C. or less as determined by differential scanning calorimetry (DSC);
(ii) one or more butyl rubbers;
(iii) one or more antioxidants; and
(iv) one or more filler materials,
wherein the one or more polyisobutenes are independently selected from the group consisting of low-molecular weight polyisobutenes (LMW PIB) having an average molecular weight Mv in the range of about 500 to about 20,000, and mid-molecular
weight polyisobutenes (MMW PIB) having an average molecular weight Mv in the range of about 20,000 to about 120,000.
13 . Process for covering a shaped article with a wrapping tape according to claim 10 .
14 . Process for covering a shaped article with a wrapping tape according to claim 13 , wherein the wrapping tape is wrapped around the shaped article such that subsequent layers of the wrapping tape overlap each other.
15 . Process of claim 13 , wherein after the wrapping tape has been applied, a mechanical protective layer is wrapped around the shaped article.