Composition for corrosion protection of molded products

Abstract

The present invention comprises (i) an amorphous polymer composition containing one or more polyisobutenes, each having a glass transition temperature of -40°C or lower, 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 have an average molecular weight in the range of about 500 to about 20,000 M v Low molecular weight polyisobutene (LMW PIB) having a molecular weight in the range of approximately 20,000 to approximately 120,000 M v The present invention relates to a corrosion-preventive composition for protecting articles from corrosion, independently selected from the group consisting of medium molecular weight polyisobutenes (MMW PIBs) having the following properties.

Description

Technical Field

[0001] The present invention relates to a composition for protecting articles such as molded articles. In particular, the present invention relates to an anti-edible composition for articles. The article can be made of or consist essentially of one or more metals, metal compositions or alloys. The present invention particularly relates to a composition having an anti-corrosion effect on articles for insulating and sealing articles that come into contact with salts, moisture, water and other substances that are corrosive to the articles. The present invention also relates to a composition that can be used for anti-corrosion of underground and underwater articles. In the present invention, the articles are assumed to include oil lines, oil pipes, gas lines, gas pipes, manhole covers, underground tanks, manhole covers, welded joints, flanges, crane hooks, dividable shafts below the ground and thermite welding in T-joints. The present invention also relates to a composition that can be used to protect materials used in onshore and offshore wind power plants (wind turbines).

Background Art

[0002] (Molded) articles are anti-corrosion using a plurality of materials. Molded articles such as manhole covers, underground tanks, pipes, or lines are often made of metals, metal compositions or alloys, and such molded articles are corroded because they come into contact with salts, moisture, water and other corrosive components. Corrosion reduces the strength of each material, and is therefore clearly undesirable because it is necessary to prevent or suppress it in order to extend the life cycle of the molded article as much as possible.

[0003] Materials for preventing corrosion, especially long-term corrosion, need to have chemical, physical, mechanical, and thermal stability over a long period. Further, as is well known in the art, the application of such materials is often a cumbersome, time-consuming, and costly process. The materials should also have good adhesion to other materials already present in the metal structure, such as metals, metal compositions, alloys, and other coatings such as epoxy coatings, plastic materials or polymers, for example, materials used such as polyethylene and polypropylene. Another requirement is that these materials have a very low permeability to water, salts, and moisture.

[0004] Some materials for inhibiting or preventing corrosion are known in the art. Such materials include bitumen and synthetic thermosetting resins, such as epoxy coatings and polyurethane coatings. These materials have the disadvantage that hard coatings or seals are formed, which may easily crack or break under the influence of, for example, mechanical stress. Another drawback of these materials is that, for example, volatile solvents or other components harmful to the environment and humans are required to apply such materials. After applying these materials, for example, the solvent evaporates, which may result in the formation of a microporous seal or coating that is at least permeable to corrosive substances such as salts, water, and moisture. [[ID=Z]]

[0005] Bitumen is also permeable to water and generally does not meet the requirements defined by KIWA ("Keuringsinstituut voor Waterleidingartikelen"; Dutch Water Supply Articles Inspection Institute). Further, bitumen generally has a glass transition temperature above about 10°C. As a result, crack formation can easily occur under low-temperature conditions, for example, during winter.

[0006] Synthetic thermosetting resins are also easily cracked or torn by mechanical stress. Furthermore, these are not easily removed from the molded product, and easy removal is crucial when repairing the molded product or when it is necessary to restore the degraded level of protection provided by the thermosetting resin. In addition, cleaning the molded product required when applying a new seal or coating is difficult, and therefore complex and cumbersome cleaning techniques such as sandblasting must be employed to clean the molded product to a sufficient degree. If the molded product is a gas or oil line or pipeline hundreds of miles long, it is obvious to those skilled in the art that replacing or repairing a seal or coating made of synthetic thermosetting resin is a time-consuming and costly operation. Finally, applying a seal or coating based on synthetic thermosetting resin on its own is difficult and laborious.

[0007] U.S. Patent No. 5,898,044 discloses a composition having improved properties compared to the above-mentioned materials. This composition comprises a non-polar, non-thermosetting fluid polymer, such as polyisobutene, having a glass transition temperature of less than -20°C and a surface tension of less than 40 mN / m at temperatures higher than its glass transition temperature, and a filler material. The composition may contain an antioxidant such as 2,6-di-t-butyl-4-methylphenol (BHT). The composition can be used in combination with shrink sleeves, tapes, belts, mats, or tapes having an open-cell structure. However, the composition according to U.S. Patent No. 5,898,044 has several drawbacks. For example, when the composition contains 2,6-di-t-butyl-4-methylphenol as an antioxidant, the inventors have found that the antioxidant leaches out of the composition, thereby reducing the protective properties of the composition due to oxidative degradation of the non-thermosetting fluid polymer. This has the undesirable effect of reducing the adhesive strength and / or impermeability of the composition over time, for example, when applied to molded articles. As a result, this sealing system has a shortened lifecycle and requires repair or replacement earlier than desired. Since sealing systems require a long lifecycle, generally 50 years or more, and their application is expensive and cumbersome, it is obvious to those skilled in the art that such sealing systems need improvement. Therefore, the inventors investigated this technical problem and found that the leaching of 2,6-di-t-butyl-4-methylphenol reduces adhesive strength.

[0008] International Publication No. 99 / 56055 discloses a method for protecting metal pipes from corrosion by applying a film to them. The film comprises an outer layer, an intermediate layer, and an inner layer. The outer layer is preferably made of a polymer, particularly high-density polyethylene. The intermediate layer is preferably made of a metal, particularly aluminum. The inner layer preferably comprises an adhesive or mastic. The film must be applied using heat. As will be apparent to those skilled in the art, this method is cumbersome and time-consuming and inferior to the method disclosed in U.S. Patent No. 5,898,044.

[0009] International Publication No. 99 / 48997 discloses a composition comprising an organic material subject to oxidation, heat, or photo-induced decomposition, and two or more antioxidants, wherein the organic material can be selected from a wide range of materials, including polyisobutene. According to International Publication No. 99 / 48997, the composition can be used in a wide variety of applications, such as lubricants, hydraulic fluids, and metalworking fluids. However, International Publication No. 99 / 48997 does not disclose that the composition can be used to protect molded products from corrosion.

[0010] European Patent No. 1086963 discloses an ethylene copolymer composition that can be used as a gasket, for example, a corrosion-resistant pipe fitting. It discloses a stretchable packaging film having a multilayer structure, for example, a multilayer film having a non-adhesive surface and an adhesive surface. Such a multilayer film has a film layer containing ethylene / α-olefin copolymer as an intermediate layer, a non-adhesive layer of LLDPE having a higher density than the ethylene / α-olefin copolymer, and an adhesive layer containing a composition containing ethylene / α-olefin copolymer and 2 to 10% liquid polyisobutene, liquid polybutadiene, etc. The thickness of the stretchable packaging film is 10 to 50 μm. [Prior art documents] [Patent Documents]

[0011] [Patent Document 1] U.S. Patent No. 5,898,044 [Patent Document 2] International Publication No. 99 / 56055 [Patent Document 3] International Publication No. 99 / 48997 [Patent Document 4] European Patent No. 1086963 [Overview of the project] [Means for solving the problem]

[0012] The present invention relates to a corrosion-preventive composition, wherein the corrosion-preventive composition is: (i) an amorphous polymer composition comprising one or more polyisobutenes, each having a glass transition temperature of -40°C or lower, 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 Includes, One or more polyisobutenes have an average molecular weight M in the range of approximately 500 to 20,000. v Low molecular weight polyisobutene (LMW PIB) having a molecular weight in the range of approximately 20,000 to approximately 120,000 M v It is independently selected from the group consisting of medium molecular weight polyisobutenes (MMW PIBs) having the following properties. [Modes for carrying out the invention]

[0013] As used herein and / or in the claims, the term "to comprise" and its conjugations are used in their non-restrictive sense to mean that the items following the term are included, but items not specifically mentioned are not excluded.

[0014] As used herein and / or in the claims, the term “consisting of” and its conjugations are used in their restrictive sense to mean that the items following the term are included, but not any further items not specifically mentioned.

[0015] As used herein and / or in the claims, the term "consisting essentially of" and its conjugations are used in their limited sense to mean that certain further components, i.e., components that do not substantially affect the essential properties of the composition, may be present.

[0016] The indefinite article "a" or "an" does not rule out the possibility of multiple elements existing unless the context explicitly requires that only one element exists. The articles "a" or "an" usually mean "at least one."

[0017] Even if disclosed as separate embodiments, all possible combinations of embodiments are also included herein. In other words, unless otherwise specified, those skilled in the art will understand that embodiments can be combined. This means that combinations of components in a corrosion protection composition may fall within the scope of the present invention, even if such combinations are not explicitly disclosed.

[0018] As used herein, "average molecular weight" means, unless otherwise specifically defined, "number-average molecular weight (M)". n )”, “Viscosity average molecular weight (M v )”, “Weight average molecular weight (M w ) could refer to "

[0019] The term "polymer" includes homopolymers and copolymers.

[0020] The term "copolymer" includes polymers that contain two or more different monomers.

[0021] Generally, those skilled in the art use the term "polyisobutene" (PIB) in a general form when referring to an amorphous polymer that mainly contains isobutene monomer and optionally further monomers, such as 1-butene, 2-butene, and / or butadiene. These amorphous polymers have similar properties, particularly with respect to glass transition temperature and surface tension. Depending on the desired purity of polyisobutene, they can be prepared by various methods (see Ullmanns, "Encyklopaedie der technischen Chemie," 4th edition, Vol. 19, pp. 216-223, 1980, and Vol. 13, pp. 621-623, 1977). The term "polyisobutene" is calculated based on the total weight of polyisobutene, containing an amount of isobutene monomer such as at least about 50% by weight, at least about 75% by weight, at least about 90% by weight, or at least about 95% by weight, and optionally C2-C 12 Alkene, C4~C 12 The polymer contains monomers selected from the group consisting of alkadienes and mixtures thereof in an amount of about 50% by weight or less, about 25% by weight or less, about 10% by weight or less, or about 5% by weight or less.

[0022] The term "polyisobutene homopolymer" is used herein to distinguish polyisobutene having a very high isobutene monomer content from, for example, the polyisobutene having a lower isobutene monomer content as described above, as well as from the polybutene and butyl rubber described below. Thus, as used herein, the term "polyisobutene homopolymer" refers to a polymer consisting essentially of isobutene monomers, i.e., a polymer containing, based on the total weight of the polymer, about 98% to about 100% by weight of isobutene, preferably about 99% to about 100%, more preferably about 99.5% to about 100%, even more preferably about 99.7% to about 100%, and particularly about 99.9% to about 100% isobutene. In preferred embodiments of the present invention, the polyisobutene is a polyisobutene homopolymer.

[0023] As used herein, the term “polybutene” refers to polymers prepared from C4 fractions obtained from petroleum refining processes (e.g., C4 fractions containing 1-butene, 2-butene, isobutene, and optionally butadiene).

[0024] The term "butyl rubber" refers to a polymer consisting of approximately 95% to 98% by weight of isobutene and approximately 2% to 5% by weight of isoprene, based on the total weight of the polymer. This includes both vulcanized and unvulcanized butyl rubber. It also includes halogenated butyl rubber.

[0025] The terms “mechanical protective layer” and “outer wrap layer” are used interchangeably herein and both refer to a layer that mechanically protects one or more underlying layers from external forces.

[0026] Throughout this application, the terms “article” and “shaped article” are used interchangeably.

[0027] The corrosion-preventive composition of the present invention improves adhesion to any type of surface, resulting in improved mechanical strength and mechanical load-bearing capacity. Therefore, the advantages of the present invention are that the composition exhibits improved curing, improved deformability, and very good adhesion on molded articles to be sealed or coated, i.e., extremely good adhesion to the surface of the molded article. The composition according to the present invention does not solidify and therefore remains flexible, is impermeable to water, moisture, and salt, and has dense pores. Permeability can be adjusted, for example, by the use and addition of filler materials. The amount of filler material should not exceed a certain threshold, but should not fall below a critical value known to those skilled in the art. A further very important feature of the composition of the present invention is that, if a coating or seal made of the composition of the present invention is mechanically deformed to a relatively small extent, the damage is automatically repaired within a relatively short period of time due to the fluid-like and / or viscoelastic properties of the composition of the present invention. That is, the composition has self-healing properties, and any deformation or damage is repaired as a result of the flow of the composition into holes or cavities caused by mechanical deformation or soil stress. The self-healing effect is particularly obtained when the composition is completely covered by a flexible outer wrap layer that is wrapped around, for example, a tubular object and subjected to tension. The tension remaining in the outer layer presses the composition toward the damaged area. As a result, a seal or coating containing the composition according to the present invention is not only smooth when applied, but even if dents, marks, indentations, cavities, etc. are caused by mechanical forces, they will eventually disappear, and the smooth surface of the seal or coating will reappear. Clearly, due to this fluid-like property, any seal or coating containing the composition according to the present invention will not crack or break and will not accumulate internal stress. Similarly, surface irregularities of molded objects are completely filled or encompassed by the composition according to the present invention, and materials according to the prior art often cause problems in such situations.

[0028] According to the present invention, the composition of the present invention can be used in combination with a backing layer that provides a wrapping tape for protecting an article from corrosion (as defined in more detail below). Such a wrapping tape can be applied with the (outer) mechanical protection layer defined above that provides a complete coating of the present invention. In addition to the above properties, the composition of the present invention has improved drip resistance, i.e., no dripping of the composition is observed after 48 hours at T max +20 °C (minimum 80 °C). Such drip resistance is tested on the wrapping tape, which means that the compound is extruded, calendered, or rolled, for example, to a thickness of 2 mm, and the product further includes a mesh or net incorporated into the compound and, optionally, a polymer backing (such as PE) on one side of the product. This composition also exhibits good adhesion measured in a peel test at a peel rate of 10 mm / min to steel and plant coatings (such as PE, PP), and the peel strength at 23 °C is 0.2 N / mm or more, and at T max (85 °C) it is 0.02 N / mm or more (test according to ISO 21809-3). For example, the composition of the present invention has a peel strength of about 0.3 N / mm or more, about 0.4 N / mm or more, or about 0.5 N / mm or more at 23 °C. In particular, the composition of the present invention has a peel strength of about 0.4 N / mm or more at 23 °C. In addition to the above, the composition of the present invention has a peel strength of about 0.03 N / mm or more, about 0.04 N / mm or more, about 0.05 N / mm or more, or about 0.06 N / mm or more at 85 °C. The coverage rate of the substrate by the agglomeration separation mode and the residual compound is 95% or more. The lap shear test at a shear rate of 10 mm / min shows a lap shear strength of 0.004 N / mm 2 or more at 23 °C and a lap shear strength of 0.002 N / mm 2 or more at Tmax, and shows an agglomeration separation mode and a substrate coverage rate of 95% or more by the residual compound. The specific electrical insulation resistance of the composition of the present invention is 10E+08 Ω.m 2That concludes the report. Furthermore, the impact resistance of a complete coating including one layer of wrapping tape and two appropriate outer wrap layers at 23°C was observed to be 15 joules or more when tested according to ISO 21809-3. max The complete coating exhibited 0mm of cathodic peel resistance, with no damage observed and self-healing completed.

[0029] In addition, the compositions of the present invention also exhibit tackiness (i.e., immediate adhesion) and ease of application at various ambient temperatures. Ambient temperature is location-dependent and may differ between the Northern and Southern Hemispheres. The tackiness of the compositions of the present invention is present at any ambient temperature.

[0030] Other advantages of the compositions according to the present invention include high chemical stability and resistance over a wide pH range, very good electrochemical impedance, high cathode protection performance, and essentially no cathode delamination. Furthermore, the compositions can be used within an operating temperature range of -50 to 120°C, for example, -50°C to 100°C, -50°C to 85°C, or 45°C to 85°C. Any temperature such as -40°C, -35°C, -30°C, -25°C, -20°C, -15°C, -10°C, -5°C, -0°C, 10°C, 20°C, 30°C, 40°C, 50°C, 60°C, 70°C, 80°C, 90°C, 100°C, or 110°C can be combined with any of the above ranges.

[0031] The compositions according to the present invention have further advantages. Most protective systems require the use of a primer before they can be applied to a molded product in order to provide sufficient adhesion. The use of a primer is not required with the compositions according to the present invention, which means that the compositions can be applied in a shorter time, thereby making the operation less expensive. Therefore, in one preferred embodiment provided herein, the compositions of the present invention do not use a primer.

[0032] In desert-like environments, sandstorms occur regularly. Any protective system that must be applied by spray technology cannot be used under such conditions. However, the inventors have found that the composition of the present invention can be applied without resulting in an inferior protective layer.

[0033] While molded articles can be directly coated with the compositions according to the present invention under wet conditions, most systems in the prior art generally cannot be used under such conditions. Therefore, in one embodiment, the corrosion-preventive compositions of the present invention can be applied to wet or damp surfaces. In one embodiment, condensation should not occur when applying the compositions of the present invention.

[0034] Molded articles protected with the composition according to the present invention can be easily inspected because the protective layer of the composition according to the present invention can be easily removed and reapplied after inspection. Most materials in the prior art are far more difficult to remove. Furthermore, if such prior art materials are removed, the surface of the molded article must be thoroughly cleaned before such materials can be reapplied. This is not necessary in the present invention. Clearly, the protective layer of the composition according to the present invention is also easier to test.

[0035] Amorphous polymer composition The amorphous polymer composition of the present invention comprises one or more amorphous polymers. The amorphous polymer according to the present invention is a polymer that does not have an organized pattern in its molecular structure and is non-crystalline. According to the present invention, the amorphous polymer composition comprises one or more polyisobutenes (PIBs) having a glass transition temperature of -40°C or lower, as determined by differential scanning calorimetry (DSC). The amorphous polymer composition may also comprise one or more further amorphous polymers, preferably hydrocarbon polymers. Such hydrocarbon polymers are preferably inherently unvulcanized (non-crosslinked) so as to optimize their low-temperature flow properties. In a preferred embodiment, the amorphous polymer composition comprises only one or more polyisobutenes. The amorphous polymer composition according to the present invention does not contain butyl rubber.

[0036] Amorphous polymers may contain at least one polymer with a low molecular weight. Amorphous polymers may contain at least one polymer with a medium molecular weight. The number-average molecular weight and molecular weight distribution can be determined by gel permeation chromatography (GPC), as is well known in the art.

[0037] The average molecular weight is the number-average molecular weight (M n ), viscosity average molecular weight (M v ), or weight-average molecular weight (M w ) can be expressed as. In one embodiment, the average molecular weight is the viscosity-average molecular weight (M v )

[0038] Amorphous polymers have a glass transition temperature T of less than about -40°C, preferably less than about -50°C, and more preferably less than about -60°C. g Amorphous polymers have the following characteristics: According to general requirements, amorphous polymers do not have a melting point or crystallization point when measured by differential scanning calorimetry (DSC) in the temperature range of -120°C to +190°C. Amorphous polymers may have a surface tension of less than about 50 mN / m at 20°C, preferably less than about 40 mN / m at 20°C. The glass transition temperature can be determined by DSC known in the art, such as ISO 11357-2. The surface tension can be determined by methods known in the art (see S. Wu, J. Colloid. Interface. Sci. 31, 153, 1969; DGLeGrand, GLGaines, Jr., J. Colloid. Interface Sci. 31, 162, 1969).

[0039] According to the present invention, the polyisobutene used in the composition according to the present invention has a glass transition temperature of less than -40°C, preferably less than -50°C, and more preferably less than -60°C. The surface tension of the polyisobutene may be less than 40 mN / m at temperatures higher than the glass transition temperature of the polyisobutene.

[0040] The surface tension parameter is also used to define a particular class of polyisobutene. Generally, polymers with relatively low surface tension have better flow, wetting, and adhesion properties than polymers with relatively high surface tension. Furthermore, it is well known in the art that surface tension increases with increasing molecular weight (and viscosity), but increases above molecular weights of 2000-3000 are generally negligible, reaching approximately 1 mN / m at infinite molecular weight. See, for example, J. Bandrup, E. H. Mimmergut, Polymer Handbook, third edition (1989), page VI / 412. Accordingly, in this invention, surface tension is used to distinguish very low molecular weight polyisobutene from the polyisobutene according to the present invention and thus define the minimum molecular weight. Thus, the polyisobutene according to the present invention has a surface tension of less than 40 mN / m at temperatures above the glass transition temperature.

[0041] One or more polyisobutenes may comprise at least one polyisobutene with low molecular weight (LMW PIB). Low molecular weight polyisobutenes have an average molecular weight in the range of about 500 to about 20,000. Polyisobutenes may also comprise at least one polyisobutene with medium molecular weight (MMW PIB). Medium molecular weight polyisobutenes have an average molecular weight in the range of about 20,000 to about 100,000. In one embodiment, medium molecular weight polyisobutenes have an average molecular weight in the range of about 20,000 to about 120,000.

[0042] The polyisobutene according to the present invention does not contain high molecular weight polyisobutene (HMW PIB), i.e., polyisobutene having an average molecular weight greater than 120,000. In one embodiment, one or more polyisobutenes according to the present invention have a viscosity-average molecular weight M of 80,000. v It does not contain polyisobutene exceeding a certain limit.

[0043] The amorphous polymer composition includes (a) the number average molecular weight M n (b) Polyisobutene with a viscosity-average molecular weight of 500-5,000; (b) Viscosity-average molecular weight M v(c) Viscosity-average molecular weight M v (d) Polyisobutene with a viscosity-average molecular weight of 20,000 to 35,000; (d) Viscosity-average molecular weight M v Polyisobutene with a viscosity of 35,000 to 45,000; (e) viscosity-average molecular weight M v Polyisobutene with a viscosity of 45,000 to 55,000; (f) Viscosity-average molecular weight M v Polyisobutene with a viscosity-average molecular weight of 55,000 to 65,000 (g) M v Polyisobutene with a viscosity of 65,000 to 75,000; (h) viscosity-average molecular weight M v (i) polyisobutene with a viscosity-average molecular weight of 75,000 to 85,000; and (i) viscosity-average molecular weight M v It contains one or more polyisobutenes independently selected from the group of polyisobutenes whose polyisobutenes have a polyisobutene count of 85,000 to 120,000.

[0044] In one embodiment, polyisobutene (a) has a viscosity-average molecular weight M of 500 to 5,000. v It may have the following characteristics. In any of the above disclosures, the average molecular weight is the number average molecular weight (M n ), viscosity average molecular weight (M v ) or weight-average molecular weight (M w ) can be. In one embodiment, the average molecular weight is the viscosity-average molecular weight (M v ) or may be as defined below. In one embodiment, all of the above molecular weight ranges are number average molecular weight ranges (M n ) In one embodiment, all of the above molecular weight ranges are weight-average molecular weight ranges (M w ) In one embodiment, all of the above molecular weight ranges are viscosity-average molecular weight ranges (M v ) . A combination of polyisobutenes having a viscosity-average molecular weight, number-average molecular weight, or weight-average molecular weight within any of the above ranges (a) to (i) can be used.

[0045] In one embodiment, the amorphous polymer composition may contain only one of the above-mentioned polyisobutenes. In another embodiment, the amorphous polymer composition may contain two of the above-mentioned polyisobutenes. In another embodiment, the amorphous polymer composition may contain three of the above-mentioned polyisobutenes. In another embodiment, the amorphous polymer composition may contain four of the above-mentioned polyisobutenes. In another embodiment, the amorphous polymer composition may contain five of the above-mentioned polyisobutenes. In another embodiment, the amorphous polymer composition may contain six or more of the above-mentioned polyisobutenes.

[0046] In one embodiment, the amorphous polymer composition comprises at least one LMW PIB, for example, at least one polyisobutene from groups (a) and (b) above. In another embodiment, the amorphous polymer composition comprises at least one LMW PIB, for example, at least one polyisobutene from groups (a) and (b) above, and at least one MMW PIB, for example, at least one polyisobutene from groups (c) and (i) above. In another preferred embodiment, the amorphous polymer composition comprises just one LMW PIB from groups (a) and (b) above, and just one MMW PIB from groups (c) and (i) above. In a further embodiment, the amorphous polymer composition comprises at least one MMW PIB, for example, at least one polyisobutene from groups (c) to (i) above. In preferred embodiments, the amorphous polymer composition comprises only one MMW PIB, for example, only one polyisobutene from groups (c) to (i) above; more preferably, only one polyisobutene from groups (c) to (h) above. In particularly preferred embodiments, the amorphous polymer composition comprises only one MMW PIB from groups (c) to (g) above.

[0047] While we do not wish to be bound by any particular theory, low molecular weight polyisobutene enhances tackiness, fluidity, and substrate wetting, while medium molecular weight polyisobutene provides stronger adhesion and shear resistance. By using a mixture of polyisobutenes with different molecular weights, the resulting compositions of the present invention also exhibit improved durability and tackiness properties. The medium molecular weight grade functions as a valuable elastomer base and exhibits high cohesive strength. The low molecular weight grade is a suitable liquid-like tackifier that promotes wetting and adhesion.

[0048] A mixture of polyisobutenes having at least two different molecular weights can harmonize conflicting factors such as the adhesive's ability to spread and wet the probe, and the composition's resistance to being pulled out.

[0049] In one embodiment, one or more polyisobutenes are used in an amount of about 10 to 70% by weight. For example, one or more polyisobutenes may be used in an amount of about 15 to 65% by weight, about 20 to 60% by weight, about 25 to 55% by weight, or about 30 to 50% by weight. In a preferred embodiment, one or more polyisobutenes are used in an amount of about 30 to 50% by weight. All are based on the total weight of the anticorrosive composition. In a preferred embodiment, one or more polyisobutenes are used in an amount of about 40 to 60% by weight, for example, 40 to 55% by weight. In a more preferred embodiment, only one polyisobutene is used in an amount of about 40 to 60% by weight, for example, 40 to 55% by weight.

[0050] In another embodiment, when two polyisobutenes are used, the weight ratio is approximately 1:1, approximately 2:1, approximately 3:1, approximately 4:1, or approximately 5:1.

[0051] According to the present invention, the amorphous polymer composition comprises, based on the total weight of the amorphous polymer composition, one or more polyisobutenes in about 50 to about 100% by weight and one or more other amorphous polymers in about 0 to about 50% by weight. In a preferred embodiment, the amorphous polymer composition comprises, based on the total weight of the amorphous polymer composition, one or more polyisobutenes in about 80 to about 100% by weight and one or more other amorphous polymers in about 0 to about 20% by weight. In a more preferred embodiment, the amorphous polymer composition comprises, based on the total weight of the amorphous polymer composition, one or more polyisobutenes in about 90 to about 100% by weight and one or more other amorphous polymers in about 0 to about 10% by weight. In one embodiment, the amorphous polymer composition comprises, based on the total weight of the amorphous polymer composition, one or more polyisobutenes in more than 95% by weight, for example, one or more polyisobutenes in more than 98% by weight, one or more polyisobutenes in more than 99% by weight, or one or more polyisobutenes in more than 99.5% by weight. Most preferably, the amorphous polymer composition contains about 100% by weight of one or more polyisobutenes. In yet another embodiment, the amorphous polymer composition contains 100% by weight of one or more polyisobutenes. In a further preferred embodiment, the amorphous polymer composition contains 100% by weight of one polyisobutene. All of the above are based on the total weight of the amorphous polymer composition.

[0052] One or more other amorphous polymers are selected from the group consisting of suitable polymers such as, but are not limited to, ethene-propene copolymers, ethene-butene copolymers, ethane-propene-butenotherpolymers, amorphous propene copolymers, atactic polypropenes, poly(2-methyl-1-pentene), and mixtures thereof. According to a more preferred embodiment of the present invention, one or more other amorphous polymers are polybutene, atactic polypropylene, propene, and non-propene C2-C 12 Copolymers with alkenes (and optionally dienes), ethenes and non-ethene C2-C 12The amorphous polymer is selected from the group consisting of copolymers with alkenes (and optionally dienes) and mixtures thereof. According to a more preferred embodiment of the present invention, one or more other amorphous polymers are selected from the group consisting of ethene-propene copolymers, ethene-butene copolymers, ethene-propene-butentermolepolymers, ethene-propene-diene copolymers, polybutene, atactic polypropylene, and mixtures thereof. In one embodiment, the amorphous polymer is selected only from polyisobutene as defined above.

[0053] One or more other amorphous polymers may have a glass transition temperature of less than about -20°C, more preferably less than -40°C, and most preferably less than -60°C. Furthermore, the olefin polymer preferably has a surface tension of less than 40 mN / m at 20°C.

[0054] Butyl rubber The corrosion-preventive composition of the present invention comprises one or more butyl rubbers. As described above, the term "butyl rubber" refers to a polymer consisting of about 95% to about 98% by weight of isobutene and about 2% to about 5% by weight of isoprene, based on the total weight of the polymer. Both vulcanized butyl rubber and unvulcanized butyl rubber are included. In preferred embodiments, the butyl rubber is unvulcanized butyl rubber. The definition of butyl rubber according to the present invention also includes halogenated butyl rubber. In one embodiment, halogenated butyl rubber is not used.

[0055] In one embodiment, the corrosion protection composition comprises one butyl rubber. In another embodiment, the corrosion protection composition comprises a mixture of two butyl rubbers. In yet another embodiment, the corrosion protection composition comprises a mixture of three or more butyl rubbers. In a preferred embodiment, the corrosion protection composition comprises one butyl rubber.

[0056] The corrosion protection composition contains one or more butyl rubbers in an amount of about 5 to 25% by weight. For example, the corrosion protection composition may contain one or more butyl rubbers in an amount of about 6 to 24% by weight, about 7 to 23% by weight, or about 8 to 20% by weight, based on the total weight of the corrosion protection composition. In one embodiment, the amount of butyl rubber shall not exceed 10% by weight. In a further embodiment, the amount of one or more butyl rubbers is less than 10% by weight (but greater than 0% by weight). In a further embodiment, one butyl rubber is used in an amount of less than 10% by weight (but greater than 0% by weight). All amounts are based on the total weight of the corrosion protection composition.

[0057] One or more butyl rubbers may have a Mooney viscosity (ML1+8 at 125°C) in the range of about 25 MU to about 100 MU, for example, about 30 MU to about 75 MU, about 30 MU to about 50 MU, or about 30 MU to about 45 MU, as measured according to ISO 289-1 or ASTM D1646. In one embodiment, one or more butyl rubbers have a Mooney viscosity (ML1+8 at 125°C) of less than 55 MU according to ISO 289-1 or ASTM D1646 or less than 45 MU according to ISO 289-1 or ASTM D1646.

[0058] Filling materials The composition of the present invention comprises one or more (inert) fillers (i.e., filler materials).

[0059] In one embodiment, the filler comprises one or more inert inorganic fillers and / or one or more organic fillers. Examples of (inert) inorganic fillers include inorganic minerals, salts and / or oxides, such as chalk, barium sulfate, calcium carbonate, calcium sulfate, calcium oxide, aluminum hydroxide, aluminum oxide, magnesium oxide, silicon dioxide, fumed silica, titanium dioxide, pulverized quartz, glass, talc, slate, and kaolin. In one preferred embodiment, the filler comprises calcium carbonate. In one embodiment, the filler comprises fumed silica. In one embodiment, the filler comprises kaolin. In one embodiment, the filler comprises calcium carbonate and kaolin. In one embodiment, the filler comprises calcium carbonate and fumed silica. In one embodiment, the filler comprises calcium carbonate, kaolin, and fumed silica. In a preferred embodiment, the filler is calcium carbonate.

[0060] In one embodiment, the corrosion-preventive composition of the present invention further comprises one or more fillers in the form of pigments. Any pigment commonly used in the art can be arbitrarily selected as the pigment. The corrosion-preventive composition may contain 0.1% by weight, 0.2% by weight, 0.3% by weight, 0.4% by weight, or 0.5% by weight or more of the pigment, based on the total weight of the composition. In one embodiment, the corrosion-preventive composition comprises one pigment. In another embodiment, the corrosion-preventive composition comprises a mixture of two or more pigments.

[0061] In one embodiment, the filler comprises one or more organic fillers. The organic fillers may be, but are not limited to, cellulose, polystyrene, polyvinyl chloride, polyethylene, polypropylene, polyisoprene, polyamide, and polyester or mixtures thereof. Polyethylene and polypropylene may be present in an amorphous polymer composition that is part of the corrosion protection composition. In one embodiment, the organic filler is a polymer filler. When the polymer is applied as a filler material, it does not need to meet, for example, the glass transition temperature or molecular weight requirements specified for the amorphous polymer composition. Syndiotactic polypropylene with a glass transition temperature above -20°C can be used as a filler. In one embodiment, the corrosion protection composition does not contain organic fillers.

[0062] The total amount of one or more fillers present in the corrosion protection composition is in the range of 25 to 80% by weight, preferably 30 to 75% by weight, more preferably 35 to 70% by weight, even more preferably 40 to 70% by weight, even more preferably 40 to 60% by weight, and most preferably 40 to 55% by weight, based on the total weight of the corrosion protection composition. In a more preferred embodiment, one or more fillers are present in an amount of about 30 to 60% by weight, for example, more than 40% but less than 60% by weight. In one embodiment, the total amount of fillers present in the corrosion protection composition is at least 30% by weight, at least 40% by weight, at least 50% by weight, or at least 60% by weight, based on the total weight of the corrosion protection composition. In one embodiment, the amount of fillers present is less than 60% by weight or less than 55% by weight.

[0063] According to the present invention, all combinations of the above-mentioned fillers are included. In one embodiment, a mixture of two or more of the above-mentioned fillers is included in the present invention in any of the above-mentioned amounts, for example, three or more of the above-mentioned fillers, four or more of the above-mentioned fillers, five or more of the above-mentioned fillers, six or more of the above-mentioned fillers, or yet another different filler. In one embodiment, only one filler is used. In one embodiment, the corrosion-preventive composition of the present invention does not contain any fibrous mineral filler material.

[0064] Antioxidant The properties of polymers, such as polyisobutene, are strongly influenced by decomposition reactions that can occur during manufacturing and use. Often, these decomposition reactions are initiated by the presence of oxygen, which can be catalyzed by light, heat, water, and metal ions. The initiation reaction generates free radicals, leading to the formation of unstable hydroperoxides in the propagation reaction. Hydroperoxides are the main initiators of thermal and photodecomposition processes. Antioxidants are commonly used to prevent such decomposition reactions.

[0065] The antioxidants used in the present invention may be one or more primary and / or secondary antioxidants, one or more polyfunctional antioxidants (i.e., antioxidants combining primary and secondary antioxidant functions), or lactones. According to the present invention, primary antioxidants directly interfere with growth reactions that lead to degradation, i.e., terminate such growth reactions, while secondary antioxidants induce the degradation of hydroperoxides. The antioxidant may include a combination of two or more antioxidants. In one embodiment, the corrosion inhibitor composition includes two antioxidants. In one embodiment, the corrosion inhibitor composition includes three antioxidants. More preferably, the antioxidant is an antioxidant composition comprising at least two antioxidants, and the antioxidant composition preferably includes a primary antioxidant and a secondary antioxidant. According to a preferred embodiment, the primary antioxidant is selected from the group consisting of sterically hindered phenolic compounds.

[0066] One or more antioxidants may be present in an amount of up to 5% by weight. For example, one or more antioxidants may be present in an amount of about 0.01% to about 5% by weight, for example, about 0.05% to about 5% by weight, preferably about 0.1% to about 4% by weight, more preferably about 0.2% to about 3% by weight, and most preferably about 0.3% to about 2% by weight, based on the total weight of the corrosion-preventive composition of the present invention. In one embodiment, one or more antioxidants are present in an amount of about 0.1% by weight, 0.2% by weight, 0.3% by weight, 0.4% by weight, 0.5% by weight, 0.6% by weight, 0.7% by weight, 0.8% by weight, 0.9% by weight, or 1% by weight, based on the total weight of the composition of the present invention. In one embodiment, one or more antioxidants are present in an amount of about 0.3% by weight. In another embodiment, one or more antioxidants are present in an amount of about 0.4% by weight. In yet another embodiment, one or more antioxidants are present in an amount of about 0.5% by weight.

[0067] According to the present invention, the primary antioxidant may be selected from the group consisting of sterically hindered phenol compounds, sterically hindered alkylthiomethylphenol or arylthiomethylphenol compounds, and secondary aromatic amines, but is not limited thereto.

[0068] In one embodiment, the sterically hindered phenol compound is of formula (I): The compounds are selected from those represented by TIFF2026513913000001.tif4744. In the formula, R1 is a C1-C4 alkyl group; n is 1, 2, 3, or 4; X is -CH2-, -CH2-CH2-C(O)-Y-, or CH2-C(O)-CH2-CH2-; Y is -O- or NH-; when n=2, X is -CH2-CH2-C(O)-Y-, Y is bonded to R2, and R2 is C2-C 12 - Alkylene group, C4-C suspended by one or more oxygen or sulfur atoms 12 -It is an alkylene group or a direct bond; if n=4, X is -CH2-CH2-C(O)-Y-, Y is bonded to 2, and R2 is C4~C 10 - It is an alcanthatellite.

[0069] The C1-C4 groups include methyl, ethyl, n-propyl, i-propyl, n-butyl, i-butyl, and t-butyl. According to the present invention, the preferred meaning of R1 is t-butyl.

[0070] C2~C 12 -The alkylene group is preferably branched or linear. Examples of such groups include ethylene, propylene, tetramethylene, pentamethylene, hexamethylene, heptamethylene, octamethylene, decamethylene, and dodecamethylene. R2 is preferably C2-C 10 -Alkylene group, more preferably C2-C8-alkylene group, particularly C4-C8-alkylene group, typically hexamethylene.

[0071] C4-C suspended by one or more oxygen or sulfur atoms 12 -The alkylene group is preferably C4~C 10 -Alkylene groups, more specifically C4-C8-alkylene groups, and especially C4-C6-alkylene groups. Preferred groups include, for example, -CH2-O-CH2-CH2-O-CH2-, -CH2-(O-CH2-CH2)2-O-CH2-, -CH2-(O-CH2-CH2)3-O-CH2-, -CH2-(O-CH2-CH2-)4-O-CH2-, -CH2-CH2-O-CH2-CH2-O-CH2-CH2-, and CH2CH2-S-CH2-CH2-.

[0072] Particularly preferred C4-C suspended by one or more oxygen or sulfur atoms 12 -The alkylene groups are -CH2-CH2-O-CH2-CH2-O-CH2-CH2- and CH2-CH2-S-CH2-CH2-.

[0073] According to the present invention, C4~C 10 - The alkanetetrayl is preferably (-CH2)4C.

[0074] The preferred sterically hindered phenol compound according to the present invention is one in formula (I) where n=1 and R2 is C2~C 20-A compound that is alkyl. However, more preferred compounds are those in formula (I) where n=2 and R2 is a C2-C8-alkylene, a C4-C8-alkylene interrupted by a sulfur atom or an oxygen atom, or when Y is -NH-, R2 is further directly bonded, and compounds in formula (I) where n=4 and R2 is C4-C8-alkanetetrayl. Other preferred sterically hindered phenol compounds according to the present invention are those in formula (I) where R1 is t-butyl, n=1, 2 or 4, X is -CH2-CH2-C(O)-Y-, Y is an oxygen atom or NH-, and when n=1, R2 is C 14 ~C 18 - is alkyl; if n=2, R2 is C4~C6-alkylene or C4~C6-alkylene interrupted by an oxygen atom; if n=4, R2 is C4~C8-alkanetetrayl.

[0075] Examples of such sterically hindered phenol compounds include 2,6-di-t-butyl-4-methylphenol, Irganox® 1330, Irganox® 1010, Irganox® 1098, Irganox® 1076, Irganox® 245, Irganox® 259, Irganox® 1035, Irganox® 2246, Irganox® 3114 and Irganox® 3125, the sterically hindered alkylthiomethylphenol Irganox® 1520, i.e., 2,4-di-octylthiomethyl-6-methylphenol, and secondary aromatic antioxidants containing (polymerized) 1,2-dihydro-2,2,4-trimethylquinoline, such as Agerite® MA.

[0076] Instead of, or in addition to, sterically hindered phenol compounds, sterically hindered alkylthiomethylphenol or arylthiomethylphenol compounds or mixtures of such compounds may be used. Such compounds are disclosed, for example, in U.S. Patent No. 4,358,616. A suitable and preferred example of a sterically hindered alkylthiomethylphenol or arylthiomethylphenol compound is Irganox 1520, i.e., 2,4-dioctylthiomethyl-6-methylphenol.

[0077] According to the present invention, the secondary antioxidant may be selected from the group consisting of phosphites and thioesters, but is not limited thereto. Suitable phosphites are disclosed, for example, in U.S. Patent No. 5,763,512. According to the present invention, the phosphite is preferably of formula (II-IV): Selected from the compounds in JPEG2026513913000002.jpg49167. In the formula, R is a carbon atom, nitrogen atom or oxygen atom, n is 2, 3 or 4; R5 is a C1-C4 alkyl group, and X is a group defined above for R2 in formula (I) or C6-C 18 -A hydrocarbyl group, the hydrocarbyl group containing one or more arylene groups.

[0078] According to the present invention, the secondary antioxidant is preferably selected from the group consisting of phosphites and thioesters. Suitable secondary antioxidants include, for example, Irgafos® 168, Irgafos® 12 and Irgafos® P-EPQ (all phosphites), and Lowinox® TBM-6, BNX® DLTDP (CAS number 123-28-4) and Morstille 18 DSTDP (all thioesters). The thioester is preferably selected from the group of compounds represented by formula (VI):S-(R6-COOR7)2, where R6 is C1-C 12 An alkylene group, preferably a C1-C6 alkylene group, where R7 is C1-C 12 Alkyl alkyl groups, C6-C 12 Aryl group, C7~C12 Alkalyl group or C7~C 12 It is an aralkyl group.

[0079] In addition to primary and secondary antioxidants, the antioxidant composition preferably has formula (V): It contains further antioxidants selected from the group of lactones represented by JPEG2026513913000003.jpg50166. In the formula, R8~R 11 These are independently hydrogen, halogens, or C1-C 12 It is alkyl, R 12 ~R 16 These are independently hydrogen, halogens, or C1-C 12 It is alkyl. Preferably, R8~R 11 and R 12 ~R 16 These are, independently, hydrogen or C1~C 12 It is alkyl. More preferably, R8 and R 10 These are C1-C6 alkyl groups, and R9 and R 11 is hydrogen, R 12 ~R 16 These are independently hydrogen or C1~C 12 It is an alkyl group. More preferably, R8 and R 10 These are C1-C6 alkyl groups, and R9 and R 11 is hydrogen, R 14 and R 15 R is a C1-C6 alkyl group, 12 , R 13 and R 16 It is hydrogen. Such lactones are disclosed, for example, in U.S. Patent No. 6,310,220.

[0080] Polyfunctional antioxidants preferably include primary and secondary antioxidant functions. Examples of polyfunctional antioxidants are Irganox® L115 and Irganox® 565.

[0081] An example of a lactone that can be used as an antioxidant is Irganox® HP-136.

[0082] According to the present invention, the composition preferably comprises a primary antioxidant, the primary antioxidant preferably selected from the group of sterically hindered phenol compounds and secondary aromatic amines, and most preferably from the group of sterically hindered phenol compounds.

[0083] The composition may also contain a secondary antioxidant, which is preferably selected from the group of phosphites.

[0084] In one embodiment, the composition includes a combination of a primary antioxidant and a secondary antioxidant having a synergistic effect, preferably a combination of a primary antioxidant and a secondary antioxidant. A preferred combination is that of Irganox and Irgafos antioxidants, for example, Irganox® 1010 and Irgafos® 168.

[0085] In one embodiment, the composition comprises a combination of a primary antioxidant, a secondary antioxidant, and a lactone. In one embodiment, the lactone is Irganox® HP-136.

[0086] Further antioxidants that can be used in the present invention are known in the prior art, as described in "Additives for polyolefins," Elsevier Sciences (2015), "Handbook of antioxidants," Elsevier Science (2020), "Hand Book of Pressure Sensitive Adhesives and Coatings," Notion Press (2018), "Stabilisers for Polyolefins," Rapra Technology Limited (2001), and the contents of these documents are incorporated herein by reference.

[0087] Exemplary corrosion inhibitors Any combination of polyisobutene, additional amorphous polymers, butyl rubber, antioxidants, and fillers provided herein can be used in the corrosion protection composition. The sum of the weight percentages of all components described herein is 100% by weight. If additional components are present in the corrosion protection composition of the present invention, the sum of the weight percentages of all components provided and the sum of the weight percentages of such additional components will be 100% by weight.

[0088] Any of the following disclosures can also be combined with the general disclosures above. In other words, any combination of the components contained herein is included in the present invention within any scope contained herein.

[0089] The corrosion-preventive composition of the present invention may contain (a) at least one LMW PIB, or (b) at least one MMW PIB and one or more butyl rubbers in a total amount up to 10% by weight, or (c) at least one MMW PIB and up to one butyl rubber, or (d) one MMW PIB and one butyl rubber, and / or (e) one or more butyl rubbers having a Mooney viscosity (1+8) of less than 55 MU at 125°C according to ISO 289.

[0090] The corrosion-preventive composition of the present invention may comprise (a) at least one LMW PIB and one or more butyl rubbers, or (b) at least one MMW PIB and one or more butyl rubbers, or (c) at least one LMW PIB and at least one MMW PIB and one or more butyl rubbers, and (d) one or more butyl rubbers having a Mooney viscosity (1+8) of less than 55 MU at 125°C according to ISO 289.

[0091] In one embodiment of the present invention, the anticorrosive composition comprises any combination of the components provided herein. In other words, the term “comprising” in the general description and embodiments provided herein can be replaced with the term “consisting of.” In a further embodiment, the term “comprising” can be replaced with the term “consisting essentially of.”

[0092] An exemplary corrosion protection composition may comprise one or more LMW PIBs in about 10-40% by weight, one or more butyl rubbers in about 5-20% by weight, one or more fillers in about 30-60% by weight, and one or more antioxidants in about 0.01-1% by weight. The sum of all components is 100% by weight and is based on the total weight of the corrosion protection composition.

[0093] An exemplary corrosion protection composition may comprise about 10–40% by weight of one LMW PIB, about 5–20% by weight of one or more butyl rubbers, about 30–60% by weight of one or more fillers, and about 0.01–1% by weight of one or more antioxidants. The sum of all components is 100% by weight and is based on the total weight of the corrosion protection composition.

[0094] An exemplary corrosion protection composition may comprise about 10–40% by weight of one LMW PIB, about 5–20% by weight of one butyl rubber, about 30–60% by weight of one or more fillers, and about 0.01–1% by weight of one or more antioxidants. The sum of all components is 100% by weight and is based on the total weight of the corrosion protection composition.

[0095] An exemplary corrosion protection composition may contain about 10–40% by weight of one LMW PIB, about 5–20% by weight of one butyl rubber, about 30–60% by weight of one filler, and about 0.01–1% by weight of one or more antioxidants. The sum of all components is 100% by weight and is based on the total weight of the corrosion protection composition.

[0096] Another exemplary corrosion protection composition may comprise one or more MMW PIBs in about 10–40% by weight, one or more butyl rubbers in about 5–20% by weight, one or more fillers in about 30–60% by weight, and one or more antioxidants in about 0.01–1% by weight. The sum of all components is 100% by weight and is based on the total weight of the corrosion protection composition.

[0097] Another exemplary corrosion protection composition may comprise about 10–40% by weight of one MMW PIB, about 5–20% by weight of one or more butyl rubbers, about 30–60% by weight of one or more fillers, and about 0.01–1% by weight of one or more antioxidants. The sum of all components is 100% by weight and is based on the total weight of the corrosion protection composition.

[0098] Another exemplary corrosion protection composition may comprise about 10–40% by weight of one MMW PIB, about 5–20% by weight of one butyl rubber, about 30–60% by weight of one or more fillers, and about 0.01–1% by weight of one or more antioxidants. The sum of all components is 100% by weight and is based on the total weight of the corrosion protection composition.

[0099] Another exemplary corrosion protection composition may comprise about 10–40% by weight of one MMW PIB, about 5–20% by weight of one butyl rubber, about 30–60% by weight of one filler, and about 0.01–1% by weight of one or more antioxidants. The sum of all components is 100% by weight and is based on the total weight of the corrosion protection composition.

[0100] Further exemplary corrosion protection compositions may comprise about 40–50% by weight of one MMW PIB, about 5–10% by weight of one butyl rubber, about 30–60% by weight of one filler, and about 0.01–1% by weight of one or more antioxidants. The sum of all components is 100% by weight and is based on the total weight of the corrosion protection composition.

[0101] Further exemplary corrosion protection compositions may consist of about 40-50% by weight of one MMW PIB, about 5-10% by weight of one butyl rubber, about 30-60% by weight of one filler, and about 0.01-1% by weight of one or more antioxidants. The sum of all components is 100% by weight, all based on the total weight of the corrosion protection composition.

[0102] Further exemplary corrosion protection compositions may comprise one or more LMW PIBs in about 10-40% by weight, one or more MMW PIBs in about 10-40% by weight, one or more butyl rubbers in about 5-20% by weight, one or more fillers in about 30-60% by weight, and one or more antioxidants in about 0.01-1% by weight. The sum of all components is 100% by weight and is based on the total weight of the corrosion protection composition.

[0103] Further exemplary corrosion protection compositions may comprise about 10–40% by weight of one LMW PIB, about 10–40% by weight of one MMW PIB, about 5–20% by weight of one butyl rubber, about 30–60% by weight of one filler, and about 0.01–1% by weight of one or more antioxidants. The sum of all components is 100% by weight and is based on the total weight of the corrosion protection composition.

[0104] Wrapping tape The present invention also relates to a tape for protecting articles from corrosion, comprising a layer containing the corrosion-preventive composition of the present invention. Therefore, the present invention also solves the problem by providing a corrosion-preventive tape for articles. The terms tape and wrapping tape are used interchangeably herein.

[0105] This specification provides (wrapping) tapes comprising a layer containing a corrosion-preventive composition. Corrosion-preventive composition: (i) an amorphous polymer composition containing one or more polyisobutenes, each having a glass transition temperature of -40°C or lower as measured by differential scanning calorimetry (DSC); (ii) One or more butyl rubbers; (iii) one or more antioxidants; and (iv) One or more filler materials Includes, The amorphous polymer composition comprises one or more polyisobutenes independently selected from the group consisting of low molecular weight polyisobutenes (LMW PIBs) with an average molecular weight Mv in the range of about 500 to about 20,000, and medium molecular weight polyisobutenes (MMW PIBs) with an average molecular weight Mv in the range of about 20,000 to about 120,000. The composition of the ingredients is as described in detail above.

[0106] Furthermore, the tape includes a first layer (a) which comprises a backing made from a polymer or copolymer (film, nonwoven fabric, etc.) as defined below. The anticorrosion composition of the present invention is applied to one side of the first layer (a) as a second layer (b).

[0107] The wrapping tape according to the present invention can be easily applied to molded articles to be protected because the second layer can be easily deformed. Furthermore, the wrapping tape can be removed after application. Although some residue remains on the surface of the molded article due to cohesive failure (according to general industrial requirements and standards, cohesive separation leaves a substrate covered with 95% or more of the composition of the present invention), these residues can be easily removed by scraping or other suitable removal techniques. Furthermore, the wrapping tape can be applied in particular to pipe fittings such as T-fittings, elbows, bends, and flanges. Moreover, the wrapping tape according to the present invention can be suitably used to repair damaged or corroded molded articles that have already been treated with some protective material according to the prior art, provided that the surface of the molded article has been cleaned to the minimum cleanliness level of St2 according to ISO 8501-1.

[0108] If necessary, the wrapping tape may include a further layer (c) to protect the second layer (b). When such a protective layer (c) is conveyed, the tape can be easily wound onto a bobbin or spool or other suitable means, and adhesion between the layers of the tape can be prevented.

[0109] Layer (c) may have the function of a release liner that is removed from the tape during tape application. Layer (c) may be any suitable material for the release liner, e.g., paper, silicone-treated PET, one or more C2-C 20 The layer may also contain alkene polymers or copolymers, polyvinyl chloride (PVC), polyurethane, etc. Furthermore, the layer functions as a separation layer to enhance ease of application and as a layer that enables proper adhesion of the mechanical protective layer applied thereafter. When the mechanical protective layer is used, self-healing properties are obtained due to the fluid and / or viscoelastic properties of the second layer (b).

[0110] Furthermore, in one embodiment, the wrapping tape may preferably have a further layer (d) between layer (a) and layer (b) that includes a reinforcing net-like layer having a woven, knitted, or spool-knitted structure and that can be deformed in two orthogonal directions. The reinforcing net-like layer may be made from polyolefin fibers, such as ethane homopolymer or copolymer, propene homopolymer or copolymer, or polyester fibers, but is not limited to these, as is well known in the art.

[0111] Layer (a) of the wrapping tape may contain a polymer or copolymer. For example, layer (a) may be made of one or more α-olefins and / or diolefins, ethylene tetrafluoroethylene (ETFE), nylon, polyurethane, etc. Furthermore, examples of such polymers and copolymers include EP(D)M elastomers, ethylene homopolymers, ethylene-α-olefin copolymers, propylene homopolymers, and propylene-α-olefin copolymers. When the copolymer is an ethylene copolymer, which is a preferred embodiment of the present invention, the α-olefin is preferably C3-C 12-α-olefins, particularly C3-C8-α-olefins. Suitable α-olefins include, for example, propene, 1-butene, 1-hexene, and 1-octene. The ethylene copolymer preferably contains 0.1-30% by weight, particularly 0.1-20% by weight, of α-olefins. The density of the ethylene homopolymer or ethylene copolymer (measured according to ASTM D1248) is preferably 0.800-0.975 g / cm³. 3 Especially 0.850~0.950 g / cm³ 3 The melt index (measured according to ASTM D1238) of the ethylene homopolymer or ethylene copolymer is preferably 0.1 to 50 g / min, particularly 0.2 to 20 g / min. The wrapping tape layer (a) preferably contains one or more of the following polymers: low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), medium-density polyethylene (MDPE), high-density polyethylene (HDPE), ethenepropene copolymer, and ethenepropenediene copolymer. According to a preferred embodiment of the present invention, the wrapping tape layer (a) contains LDPE, MDPE, HDPE, or LLDPE or a combination thereof, for example, preferably a combination of LDPE and MDPE.

[0112] Layer (a) may comprise multiple layers, for example, a multilayer film comprising an LLDPE outer layer and an HDPE inner layer. Such multilayer films are well known in the art. Layer (a) may further comprise different additives such as pigments and fillers. In one embodiment, layer (a) is a single layer.

[0113] The tapes of the present invention have a total thickness suitable for their respective purposes. For example, the tapes have a total thickness of about 1 to about 20 mm, more preferably about 1 to about 15 mm, about 1 to about 10 mm, about 1 to about 7 mm, about 1 to about 5 mm, or about 1 to about 3 mm. In a preferred embodiment, the thickness is about 2 mm. The width of the tape can be adjusted as desired or appropriately, but is preferably about 2.0 to about 100.0 cm, more preferably about 2.5 to about 75.0 cm, even more preferably about 3.0 to about 70.0 cm, even more preferably about 4.0 to about 65.0 cm, and most preferably about 5.0 to about 60.0 cm. The length of the tape can also be adjusted as desired or appropriately. Before use, for example, a length of several meters of tape may be wound onto a bobbin or spool. However, the tape may also be in sheet form. The length and width of the sheet can be adjusted as desired or appropriately.

[0114] In one embodiment, the tape is applied to an article to be protected while the article is in a dry environment. The surface of the article to be protected generally does not require extensive pretreatment. However, some pretreatment can enhance the adhesive properties of the adhesive composition. For example, the article may include a precoat, such as a base layer of an epoxy resin precoat. In another embodiment of the present invention, the article may have a polyolefin layer as the base layer. Thus, one application of the adhesive composition is its use in a method for manufacturing precoated steel pipes in which a precoat, preferably a polyolefin coating, preferably a polyethylene or polypropylene coating, is provided on the pipe. In one embodiment, there is no base layer.

[0115] The present invention also relates to a method for producing a corrosion-preventive wrapping tape for molded articles, comprising the composition provided herein. Furthermore, in the method for producing a corrosion-preventive tape for articles, the corrosion-preventive composition of the present invention is laminated on a film, the film being as described above, and preferably one or more (substituted) α-olefins and / or diolefins, for example, one or more C2-C 20The tape (c) of the present invention comprises an α-alkene and / or alkadiene, polyvinyl chloride (PVC), polyurethane, or a polymer or copolymer of a nonwoven polyester fabric as defined above.

[0116] After the lamination process, the surface of layer (b) that is not in contact with layer (a) is preferably protected by layer (c), which can be any suitable material as described above.

[0117] As described above, if layer (d) exists between layer (a) and layer (b), first layer (a) and layer (d) are stacked, and then layer (b) is applied to the surface of layer (d) opposite to the surface of layer (d) that is in contact with layer (a). The thickness of layer (b) is controlled, for example, by a knife.

[0118] The wrapping tape is preferably wound onto a bobbin or spool after manufacturing.

[0119] Another important advantage of the wrapping tape according to the present invention is as follows: In the art, sulfate-reducing bacteria are frequently found in defects in the protective layer of underground molded structures. These bacteria can produce hydrogen sulfide, which is known to promote metal corrosion (see, for example, S. Grobe et al., Materials and Corrosion, Vol. 47, pp. 413-424, 1996; MJ Feijo et al., Materials and Corrosion, Vol. 651, pp. 691-697, 2000). Since infection and containment can occur during the application of the protective layer, it is essential that components that promote bacterial growth do not penetrate into the protective layer. Furthermore, it is considered that at least one of the essential elements (in particular carbon, hydrogen, sulfur, and nitrogen) should not be present in order to prevent the growth of such bacteria. The wrapping tape according to the present invention has low gas permeability (air, i.e., nitrogen, oxygen, and water vapor), is water-resistant, and does not contain nitrogen and sulfur-containing compounds (unless certain nitrogen-containing antioxidants are used; however, given the fact that only small amounts of antioxidants are added, this is not considered harmful). Therefore, the inventors believe that such microbial corrosion problems do not occur with the wrapping tape according to the present invention.

[0120] Finally, in protective systems such as butyl rubber (applied spirally to molded products such as pipelines), corrosion occurs in the overlapping areas between different windings ("spiral corrosion") because the hard butyl rubber windings are not tightly packed in the overlapping areas, leading to blockage of air and water vapor. However, such problems do not occur with the wrapping tape according to the present invention due to the fluid and / or viscoelastic properties of layer (b).

[0121] The present invention further relates to a method of covering a molded product with wrapping tape, wherein the wrapping tape is: (a) A first layer comprising a film containing one or more α-olefin and / or diolefin polymers or copolymers, and (b) The second layer, (i) an amorphous polymer composition comprising one or more polyisobutene blends, each having a glass transition temperature of -40°C or lower as measured by differential scanning calorimetry (DSC); (ii) One or more butyl rubbers; (iii) one or more antioxidants; and (iv) One or more filler materials A second layer comprising a composition containing Includes, The amorphous polymer composition comprises one or more polyisobutenes independently selected from the group consisting of low molecular weight polyisobutenes (LMW PIBs) with an average molecular weight Mv in the range of about 500 to about 20,000, and medium molecular weight polyisobutenes (MMW PIBs) with an average molecular weight Mv in the range of about 20,000 to about 120,000.

[0122] According to the present invention, the steel surface of the molded product should be cleaned to the minimum cleanliness level of St2 according to ISO 8501-1 before the application of lapping tape. The St2 level is defined as: "thorough manual and power tool cleaning" which can be achieved by techniques such as scraping, wire brushing, mechanical brushing, and polishing, as further defined in ISO 8504-3. After manual and power tool cleaning, dust and debris must be removed from the surface. When viewed without magnification, the surface should be free of visible oil, grease, and dirt, and free of lightly adhering mill scale, rust, paint, and foreign matter. The surface should have a slight metallic sheen, and anchor patterns are not required. The surface of the molded product may also be made from any polymer or copolymer disclosed above.

[0123] The wrapping tape is preferably wrapped around the molded product such that subsequent layers of the wrapping tape overlap each other, and depending on the thickness of the tape, the overlap is preferably at least 1.0 mm wide, more preferably at least 5.0 mm wide, and most preferably at least 10.0 mm wide. Larger widths, for example about 50.0 mm, are also possible, but this also depends on the width of the wrapping tape used, as will be apparent to those skilled in the art. However, to obtain a proper seal, the overlap width must be at least 1.0 mm. Furthermore, the first and last windings are preferably applied essentially perpendicular to the wrapping direction; that is, if the molded product is, for example, a pipeline, the first and last windings are applied essentially circumferentially and essentially perpendicular to the length of the pipeline. When the end of the first wrapping tape is reached, a second wrapping tape can be applied where the first wrapping tape has ended, provided that the longitudinal overlap is at least 1.0 mm, preferably at least 5.0 mm, and most preferably at least 10.0 mm. The wrapping tape is preferably applied without tension.

[0124] In one embodiment of the present invention, it is preferable that an outer wrap layer is wrapped around the molded product after the wrapping tape has been applied. In one embodiment, the outer wrap is a polymer tape or a heat-shrinkable sleeve. Preferably, the outer wrap layer is made from a material comprising one or more polyolefins selected from the group consisting of ethylene homopolymer, ethylene copolymer, ethylene vinyl chloride copolymer, vinyl chloride polymer, and ethylene vinyl acetate copolymer. According to a preferred embodiment of the present invention, the outer wrap tape is a PVC film. The outer wrap tape is preferably wrapped under tension.

[0125] Preferably, the outer wrap polymer tape is wrapped so that the overlap width is at least 20% of the width of the outer wrap polymer tape, preferably at least 40% of the width of the outer wrap polymer tape.

[0126] The applications of the compositions of the present invention are particularly in the field of corrosion protection. Accordingly, articles according to the present invention include, but are not limited to, thermite welds in oil lines, oil pipes, gas lines, gas pipes, manhole covers, underground tanks, welded joints, flanges, crane hooks, divisible shafts below ground level, bridges, buildings, railway vehicles, T-joints, etc. Articles to be protected may also be any part of a wind turbine or wind power plant, both onshore and offshore. Furthermore, articles are preferably made essentially from metal, a metal composition or a metal alloy, most preferably steel. The corrosion protection compositions of the present invention can also be used to protect plastic materials, i.e., to protect plastic (polymer) materials from degradation of any form, or to protect concrete or concrete materials.

[0127] The compositions of the present invention meet all necessary industrial requirements, including the main standards for the oil and gas industry (ISO 21809-3:2016).

[0128] protective items The present invention also relates to an article, the article being: (a) a layer of a corrosion-preventive composition as defined herein on the surface of an article; and (b) A mechanical protective layer for protecting the layer of the anticorrosive composition. Includes.

[0129] The article may include additional layers. In a preferred embodiment, the article further includes a watertight layer. In another preferred embodiment, the mechanical protective layer (b) itself is watertight.

[0130] The mechanical protective layer (b) is applied over the layer of the corrosion-resistant layer (a) to completely cover it. A suitable protective layer is provided, for example, by high-shear tapes, which are well known in the art. High-shear tapes are disclosed, for example, in U.S. Patent No. 5,817,413 and U.S. Patent No. 6,033,776.

[0131] A layer of the corrosion-preventive composition according to the present invention may be included in the tape according to the present invention. The mechanical protective layer (b) may be applied separately to the article, or the mechanical protective layer (b) may be included in the tape. The present invention also relates to an article comprising the tape according to the present invention. In the article, the surface of the article is covered with the tape.

[0132] In a preferred embodiment, the article is essentially made of metal, particularly steel. Alternatively, the surface of the article may be essentially made of metal, particularly steel, but the interior of the article may contain a different material. The article may be a tubular structure, such as a gas or oil pipe or line. The article may also be a riser for an oil drilling or production rig or platform, a wind tower, a pillar foundation or pier for a bridge, a buttress foundation for a dam, or a concrete wall.

[0133] The present invention will be further illustrated by the following embodiments, which are not intended to limit the scope of the invention by any means. [Examples]

[0134] composition Several compositions according to the present invention were prepared by mixing the components listed in Table 1 below (in weight %):

[0135] [Table 1]

[0136] The composition is first prepared by mixing a portion of the components at approximately 160°C. After the mixing process is complete, a second portion of the components is added and mixed again at 160°C. Finally, to obtain the final corrosion protection composition according to the present invention, the remaining portion of the components is added and mixed again at 160°C.

[0137] Peel test Adhesion was tested using wrapping tapes, including the backing and net described herein, according to the peel strength test described in Annex H of ISO 21809-3:2016. The requirements of Table 12 of ISO 21809-3:2016 were used. Peel strength was tested and recorded using a tensile testing machine at a peeling speed of 10 mm / min. Subsequently, the test specimens were inspected for the occurrence of agglomeration and separation (the desired properties), the absence of adhesive failure, and the presence or absence of coating of the substrate by a residual film of the composition. The results are summarized in Table 2.

[0138] [Table 2]

[0139] The results shown in Table 2 indicate that the corrosion-preventive composition according to the present invention exhibits good adhesion.

Claims

1. (i) an amorphous polymer composition comprising one or more polyisobutenes, each having a glass transition temperature of -40°C or lower, 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 Includes, The one or more polyisobutenes have an average molecular weight M in the range of about 500 to about 20,000. ｖ Low molecular weight polyisobutene (LMW PIB) having a range of approximately 20,000 to approximately 120,000 M ｖ A corrosion-preventive composition independently selected from the group consisting of medium molecular weight polyisobutenes (MMW PIB) having the following properties.

2. The aforementioned corrosion-preventive composition is - At least one LMW PIB, or - At most 10% by weight in total, at least one MMW PIB and one or more butyl rubbers, or - At least one MMW PIB and at most one butyl rubber, and / or - One or more butyl rubbers having a Mooney viscosity (1+8) of less than 55 MU at 125°C according to ISO 289. The corrosion-preventive composition according to claim 1, comprising:

3. The one or more PIBs mentioned above are a) Number average molecular weight M between 500 and 5,000 ｎ Polyisobutene having; b) Viscosity-average molecular weight M between 5,000 and 20,000 ｖ Polyisobutene having; c) Viscosity-average molecular weight M between 20,000 and 35,000 ｖ Polyisobutene having; d) Viscosity-average molecular weight M of 35,000 to 45,000 ｖ Polyisobutene having; e) Viscosity-average molecular weight M of 45,000 to 55,000 ｖ Polyisobutene having; f) Viscosity-average molecular weight M of 55,000 to 65,000 ｖ Polyisobutene having; g) polyisobutene having a viscosity average molecular weight M of 65,000 to 75,000 ｖ ; h) Viscosity-average molecular weight M of 75,000 to 85,000 ｖ Polyisobutene having; and i) Viscosity-average molecular weight M between 85,000 and 120,000 ｖ Polyisobutene having A corrosion-preventive composition according to claim 1 or 2, selected from the group consisting of the following.

4. The corrosion-preventive composition according to any one of claims 1 to 3, wherein the one or more PIBs are present in an amount of 10 to 70% by weight based on the total weight of the corrosion-preventive composition.

5. The corrosion-preventive composition according to any one of claims 1 to 4, wherein one or more butyl rubbers are present in an amount of 5 to 25% by weight based on the total weight of the corrosion-preventive composition.

6. The one or more antioxidants comprises one or more primary antioxidants and one or more secondary antioxidants, wherein the one or more primary antioxidants comprises a sterically hindered phenol compound, a sterically hindered alkylthiomethylphenol or arylthiomethylphenol compound, and a secondary aromatic amine. The corrosion-preventive composition according to any one of claims 1 to 5, wherein the sterically hindered phenol compound is not 2,6-di-t-butyl-4-methylphenol, and the antioxidant is present in an amount of up to 5% by weight based on the total weight of the corrosion-preventive composition.

7. The corrosion inhibitory composition according to claim 6, wherein the sterically hindered phenol compound comprises at least two sterically hindered phenol groups, and / or the secondary antioxidant is selected from the group consisting of phosphites and thioesters.

8. The corrosion inhibitory composition according to claim 6 or 7, wherein the antioxidant composition further comprises a lactone.

9. The corrosion-preventive composition according to any one of claims 1 to 8, wherein the one or more filler materials are present in an amount of 25 to 70% by weight based on the total weight of the corrosion-preventive composition.

10. A protective wrapping tape for articles, comprising (a) a first layer and (b) a second layer containing the anticorrosive composition according to any one of claims 1 to 8.

11. The wrapping tape according to claim 10, wherein the first layer is a film comprising one or more α-olefin and / or diolefin polymers or copolymers.

12. (a) Applying a layer of the anticorrosion composition according to any one of claims 1 to 9, or the wrapping tape according to claim 10 or 11; and optionally, (b) Applying a mechanical protective layer on the layer of the anticorrosion composition or the wrapping tape. Use of a corrosion-preventive composition for articles, including the use of such compositions.

13. A method for manufacturing wrapping tape, wherein an anticorrosion composition is laminated on a film, the film comprises a polymer or copolymer, and the anticorrosion composition is: (i) an amorphous polymer composition comprising one or more polyisobutenes having a glass transition temperature of -40°C or lower, 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 Includes, The one or more polyisobutenes have an average molecular weight M of approximately 500 to approximately 20,000. ｖ Low molecular weight polyisobutene (LMW PIB) having a molecular weight of approximately 20,000 to approximately 120,000 M ｖ A method for producing wrapping tape, independently selected from the group consisting of medium molecular weight polyisobutenes (MMW PIBs) having the following characteristics.

14. A method for covering a molded product with wrapping tape according to claim 10 or 11.

15. A method for covering a molded product with a wrapping tape according to claim 14, wherein the wrapping tape is wrapped around the molded product such that subsequent layers of the wrapping tape overlap each other.

16. The method according to claim 14 or 15, wherein a mechanical protective layer is wrapped around the molded product after the wrapping tape has been applied.

Images