Flooding composition containing polysiloxane

Abstract

The present disclosure provides a flooding composition. In one embodiment, the flooding composition comprises, in weight percent (wt%) based on the weight of the composition, (A) 10 wt% to 45 wt% of a silane-grafted polyolefin (Si-g-PO). The flooding composition also comprises (B) 5 wt% to 60 wt% of a polyalphaolefin oil (PAO oil), (C) 15 wt% to 90 wt% of a polysiloxane, and (D) 0.05 wt% to 0.2 wt% of a catalyst. [Selected Figure] Figure 1

Description

[Background technology]

[0001] Flooding compositions are materials designed to fill voids within communication cables, such as the gaps typically found around and between buffer tubes commonly used in fiber optic cables. Furthermore, flooding compositions can be used as filler materials to suspend and protect optical fibers within buffer tubes. Flooding compositions are free-flowing at high temperatures (e.g., the temperatures used when filling communication cables) and readily gel at low temperatures to avoid sagging at room temperature. Additionally, for easy installation and to prevent environmental pollution, easily cleanable and non-contaminating flooding compositions are desirable. While advances have been made in the technology of flooding compounds, further improvements are still desired.

[0002] Another important characteristic of flooding compositions is their compatibility with polymer materials used in cable structures, such as polyolefins, i.e., low gel pickup for good property retention and cable life. Current commercial flooding compounds are based on synthetic hydrocarbons. They are dirty, grease / wax-like substances that stick to the surface they come into contact with. If spilled, they are not environmentally friendly. The wire and cable industry has a continuing interest in flooding compositions that offer reduced stickiness, less absorption into materials used in the manufacture of cable components such as buffer tubes and sheaths, and are more environmentally friendly. [Overview of the Initiative]

[0003] This disclosure provides flooding compositions. In one embodiment, the flooding composition comprises (A) 10% to 45% by weight of silane-grafted polyolefin (Si-g-PO) in weight percent (W%) based on the weight of the composition. The flooding composition also comprises (B) 5% to 60% by weight of poly-α-olefin oil (PAO oil), (C) 15% to 90% by weight of polysiloxane, and (D) 0.05% to 0.2% by weight of a catalyst. [Brief explanation of the drawing]

[0004] [Figure 1] This is a cross-sectional view of a loose buffer tube optical fiber cable.

[0005] definition For the purposes of U.S. patent practice, any referenced patent, patent application, or publication, in particular, with respect to definition disclosures (to the extent that they do not conflict with any definitions specifically provided herein) and general knowledge in the art, is incorporated by reference in whole (or its equivalent U.S. version is incorporated by reference in the same way).

[0006] References to the periodic table refer to the edition published by CRC Press, Inc., 1990–1991. References to element groups in this table follow the new notation for group numbering.

[0007] Unless otherwise stated, implied by context, or customary in the art, all parts and percentages are based on weight, and all test methods are current as of the filing date of this disclosure.

[0008] Numerical ranges in this disclosure include all values ​​from the lower limit to the upper limit (including these). For ranges that include specific numbers (e.g., 1 or 2, or 3 to 5, or 6 or 7), any subrange between any two specific numbers is included (e.g., 1 to 2, 2 to 6, 5 to 7, 3 to 7, 5 to 6, etc.).

[0009] Terms such as "biofluid" refer to fluids derived from biological sources such as plants, animals, bacteria, yeast, and algae. A biofluid can be a single biofluid, i.e., a fluid derived from a single biological source, or a blend of two or more biofluids, i.e., a fluid derived from two or more biological sources. A biofluid is either a liquid under ambient conditions (23°C and atmospheric pressure) or has a waxy consistency under ambient conditions (23°C and atmospheric pressure) and becomes liquid when heated.

[0010] The terms “cable” and “power cable” refer to at least one wire or optical fiber within armor (e.g., an insulating sheath or protective sheath). Typically, a cable is two or more wires or optical fibers bonded together, typically within a common insulating sheath and / or protective sheath. Individual wires or fibers within the sheath may be exposed, covered, or insulated. Combined cables may contain both electrical wires and optical fibers. Cables may be designed for low, medium, and / or high voltage applications. Typical cable structures are disclosed in USP 5,246,783, USP 6,496,629, and USP 6,714,707.

[0011] Terms such as "composition" refer to a mixture or blend of two or more components.

[0012] The terms “comprising,” “including,” and “having,” and their derivatives, are not intended to exclude any additional components, steps, or procedures, whether or not they are specifically disclosed herein. To avoid any doubt, all compositions claimed through the use of the term “comprising” may include any additional additives, adjuvants, or compounds, whether polymers or not, unless otherwise stated. In contrast, the term “essentially consisting of” excludes any other components, processes, or procedures from the scope of the following description, except those not essential to the operability. The term “consisting of” excludes any components, processes, or procedures not explicitly described or listed. The term “or” refers to the enumerated members individually and in any combination, unless otherwise specified. The use of the singular includes the use of the plural, and vice versa.

[0013] Terms such as "ethylene-based polymer" and "polyethylene" refer to polymers that contain units derived from ethylene. Ethylene-based polymers contain more than 50 mole percent (mol%) derived from ethylene.

[0014] An "olefin polymer" or polyolefin is a polymer that contains a majority of the mole percent of polymerizable olefin monomers (based on the total amount of polymerizable monomers) and may optionally contain at least one comonomer. Non-limiting examples of olefin polymers include ethylene polymers and propylene polymers.

[0015] A "propylene-based polymer" is a polymer that contains more than 50 mole percent of polymerizable propylene monomer (based on the total amount of polymerizable monomers) and may optionally contain at least one comonomer.

[0016] When referring to monomers, "residue" refers to the portion of the monomer molecule that remains within the polymer molecule as a result of polymerization with another monomer or comonomer molecule to create a polymer molecule.

[0017] Terms such as "wire" refer to a single strand of conductive metal, such as copper or aluminum, or a single strand of optical fiber.

[0018] Test method density The density is determined according to ASTM D792, and the results are reported in grams per cubic centimeter (g / cc).

[0019] Differential scanning calorimetry (crystallinity, melting point, crystallization temperature) Differential scanning calorimetry ("DSC") is used to measure the crystallinity in polymers (e.g., ethylene-based (PE) polymers). A polymer sample of about 5 - 8 mg is weighed and placed in a DSC pan. The pan is crimped with a lid to ensure a sealed atmosphere. The sample pan is placed in the DSC cell and then heated to a temperature of 180 °C for polyethylene (or "PE") (230 °C for polypropylene or "PP") at a rate of approximately 10 °C / min. The sample is held at this temperature for 3 minutes. Then, the sample is cooled to -60 °C for PE (-40 °C for PP) at a rate of 10 °C / min and held isothermally at that temperature for 3 minutes. Next, the sample is heated at a rate of 10 °C / min until it completely melts (second heat). The percent crystallinity is calculated by dividing the heat of fusion (H f ) determined from the second heat curve by the theoretical heat of fusion of 292 J / g for PE (165 J / g for PP) and multiplying this amount by 100 (e.g., % crystallinity = (H f / 292 J / g) × 100 (for PE)).

[0020] Unless otherwise stated, the melting point(s) (T m ) of each polymer are determined from the second heat curve (peak Tm), and the crystallization temperature (T c ) is determined from the first cooling curve (peak Tc). The glass transition temperature Tg is determined from the DSC heating curve where the liquid heat capacity increases by half of the sample, as described in Bernhard Wunderlich, The Basis of Thermal Analysis, in Thermal Characterization of Polymeric Materials 92, 278 - 279 (Edith A. Turi ed., 2d ed. 1997). Baselines are drawn from below and above the glass transition region and extrapolated through the Tg region. The temperature at which the heat capacity of the sample is midway between these baselines is Tg.

[0021] Drop point The drop point is measured according to ASTM D127, and the results are reported in degrees Celsius (°C).

[0022] The flash point refers to the lowest temperature at which a volatile liquid vaporizes to form a flammable mixture in air but does not continue to burn (compared with the combustion point). The flash point is measured in accordance with ASTM D3278, and the results are reported in degrees Celsius (°C).

[0023] Gel Permeation Chromatography A high-temperature gel permeation chromatography (GPC) system equipped with a robot-assisted delivery (RAD) system was used for sample preparation and sample injection. The concentration detector is an infrared detector (IR4) manufactured by Polymer Char Inc. (Valencia, Spain). Data collection is performed using a Polymer Char DM100 data acquisition box. The carrier solvent is 1,2,4-trichlorobenzene (TCB). This system is equipped with an on-line solvent degassing device manufactured by Agilent. The column section operates at 150 °C. The columns are four Mixed A LS 30 cm, 20 micron columns. The solvent is nitrogen-purged TCB containing approximately 200 ppm of 2,6-di-t-butyl-4-methylphenol (BHT). The flow rate is 1.0 mL / min, and the injection volume is 200 microliters (μL). A sample concentrate of 2 mg / mL is prepared by dissolving the sample in nitrogen-purged and preheated TCB (containing 200 ppm of BHT) at 160 °C for 2.5 hours while gently stirring.

[0024] The GPC column set is calibrated by running 20 polystyrene ("PS") standards with narrow molecular weight distributions. The molecular weights ("MW") of the standards range from 580 to 8,400,000 g / mol, and the standards are contained in six "cocktail" mixtures. Each standard mixture has individual molecular weights that are at least an order of magnitude apart. The converted polypropylene ("PP") molecular weight of each PS standard is calculated by using the following equation, and the Mark-Howink coefficients for polypropylene (Th.G. Scholte, NL.J. Meijerink, H.M. Schoffeleers, and AMG Brands, J.Appl. Polym.Sci., 29, 3763-3782 (1984)) and polystyrene (E.P. Tocka, R.J. Roe, NY. Hellman, P.M. Uglia, Macromolecules, 4, 507 (1971)) have been reported.

number

[0025] Logarithmic molecular weight calibration is generated using a quartic polynomial regression as a function of elution volume. The number-mean and weight-mean molecular weights are calculated according to the following equations.

number

[0026] Melt Index The melt index, or I2, is measured in accordance with ASTM D1238, Condition 190°C / 2.16 kg, and reported in grams (g / 10 min) eluted every 10 minutes. I 10 is measured in accordance with ASTM D1238, Condition 190°C / 10 kg, and reported in grams (g / 10 min) eluted every 10 minutes. Melt flow rate

[0027] The melt flow rate (MFR) in g / 10 min is measured in accordance with ASTM D1238 (230°C / 2.16 kg).

[0028] Viscosity The apparent viscosity of the flooding composition is determined in accordance with ASTM D3236 at 150°C and reported in centipoise (cP). The kinematic viscosity can be calculated by dividing the apparent viscosity by the fluid density. The kinematic viscosity is reported in stokes (St) or centistokes (cSt).

[0029] The Brookfield viscosity of polymer components (i.e., polyolefin elastomers) is determined using a Brookfield Laboratories DVII+ viscometer in a disposable aluminum sample chamber according to the following procedure. The spindle used is an SC-31 hot-melt spindle suitable for measuring viscosities in the range of 10 to 100,000 centipoise (0.1 to 1,000 grams / cm²). Using a cutting blade, the sample is cut into sections small enough to fit into a 1-inch wide, 5-inch long (2.5 cm wide, 13 cm long) sample chamber. This sample is placed in the chamber and inserted into the Brookfield Thermosel, then secured with bent needle-tip pliers. The sample chamber has a notch at the bottom that fits into the bottom of the Brookfield Thermosel, ensuring that the chamber does not rotate when the spindle is inserted and rotating. Depending on the material being tested, the sample is heated to the target temperature, typically 150°C, 176°C, 176.6°C, 177°C, or 190°C (other temperatures may also be used), and additional sample is added until the molten sample is approximately 1 inch (2.5 cm) below the top of the sample chamber. The viscometer is lowered, immersing the spindle in the sample chamber. The lowering continues until the bracket of the viscometer is aligned with the Thermosel. The viscometer is turned on and set to shear rate, and the torque is read in the range of 30–60%. Readings are taken every minute for approximately 15 minutes, or until the value stabilizes, and the last reading is recorded.

[0030] oil separation After mixing the sample as described above, pour 50 milliliters (mL) of the molten sample into a shallow aluminum pan and allow the sample to cool and solidify. After leaving it at room temperature for 24 hours, oil separation will become visible on the surface, and the result should be recorded.

[0031] The "pour point" is the lowest temperature at which a liquid becomes semi-solid and loses its flow properties, or in other words, the lowest temperature at which a liquid flows. The pour point is measured according to ASTM D97, and the results are reported in degrees Celsius (°C). [Modes for carrying out the invention]

[0032] This disclosure provides flooding compositions. In one embodiment, the flooding composition comprises (A) 10% to 45% by weight of a silane-grafted polyolefin. The flooding composition also comprises (B) 5% to 60% by weight of a poly-α-olefin oil. The flooding composition also comprises (C) 15% to 90% by weight of a polysiloxane and (D) 0.05% to 2.0% by weight of a catalyst. The total amount of components (A), (B), (C), and (D) reaches 100% by weight of the flooding composition.

[0033] A. Silane-grafted polyolefins The flooding composition of the present invention comprises a silane-grafted polyolefin. The silane-grafted polyolefin (or "Si-g-PO") is formed by grafting a hydrolyzable silane monomer (such as a vinylsilane monomer) onto the backbone of one or more base polyolefins. The grafting is carried out in the presence of a free radical generator such as a peroxide. The hydrolyzable silane monomer is grafted onto the backbone of the base polyolefin(s) before incorporating or compounding Si-g-PO into the final composition, or simultaneously with the extrusion of the composition, in order to form a final article or composition. In one embodiment, the hydrolyzable silane monomer is grafted onto the backbone of the base polyolefin(s) before incorporating or compounding Si-g-PO into the final composition.

[0034] The base polyolefin for Si-g-PO may be an ethylene-based polymer, a propylene-based polymer, or a combination of an ethylene-based polymer and a propylene-based polymer. In one embodiment, Si-g-PO comprises two base polyolefins: (i) a first amorphous polyolefin and (ii) a second amorphous polyolefin. The "amorphous polyolefin" (or "APO") is an ethylene-based or propylene-based polymer having a melt viscosity of 30 centipoise (cP) to 50,000 cP at 190°C and a glass transition temperature (Tg) of -80°C to 0°C.

[0035] The first APO is different from the second APO. In other words, the first APO differs from the second APO in one or more chemical properties and / or one or more physical properties compared to each of the second APO's respective chemical or physical properties. Non-limiting examples of properties that may differ between the first and second APOs include composition, comonomer type, comonomer content, density, melt viscosity, Tg, softening point, and any combination thereof.

[0036] Within Si-g-PO, the ratio of the first APO to the second APO is 3:1 to 1:3, based on the total weight of Si-g-PO. In one embodiment, the ratio of the first APO to the second APO is 3:1, or 2:1, or 1:1 to 1:2, or 1:3.

[0037] In one embodiment, the first APO is an ethylene-based polymer. In a further embodiment, the first APO is an APO-ethylene / octen copolymer, and has the following properties: (i) a density of 0.86 g / cc, or 0.87 g / cc, or 0.875 g / cc to 0.89 g / cc, and / or (ii) Brookfield viscosity of 5,000 cP, or 6,000 cP to 10,000 cP, or 13,000 cP, or 15,000 cP, or 17,000 cP, or 19,000 cP, or 20,000 cP at 176.6°C, and / or (iii) Tm of 65°C, or 68°C to 70°C, or 72°C, and / or (iv) Tg at -60°C, or -58°C to -55°C, or -50°C, or -45°C, and / or (v) Having one, some, or all of the following Tc values: 55°C, or 57°C to 60°C.

[0038] Non-limiting examples of suitable APO ethylene polymers include AFFINITY GA1875, AFFINITY GA1900, AFFINITY GA1950, and AFFINITY GA1000R, all available from The Dow Chemical Company.

[0039] In one embodiment, the second APO is a propylene-based polymer such as a propylene / ethylene copolymer or a propylene homopolymer. In further embodiments, the second APO propylene-based polymer has the following properties: (i) Brookfield viscosity of 200 cP, or 300 cP, or 500 cP, or 1,000 cP to 1,500 cP, or 3,000 cP, or 5,000 cP, or 7,500 cP, or 10,000 cP to 13,000 cP, or 15,000 cP, or 18,000 cP, or 20,000 cP, and / or (ii) a ring-spherical softening point of 120°C, or 125°C, or 130°C-135°C, or 140°C, or 145°C, and / or (iii) Tg at -40°C, or -35°C, or -30°C to -25°C, or -20°C, or -15°C, and / or (iv) APO propylene / ethylene copolymer having one, some, or all of the following Tc values: 90°C or 93°C to 95°C.

[0040] In one embodiment, the second APO is an APO-propylene homopolymer. The APO-propylene homopolymer has the following properties: (i) Brookfield viscosity of 500 cP, or 1,000 cP, or 1,500 cP to 2,000 cP, or 2,500 cP, or 3,000 cP at 190°C, and / or (ii) a ring-spherical softening point of 150°C, or 155°C to 160°C, and / or (iii) Having one, some, or all of the following Tg values: -15°C or -10°C to -5°C.

[0041] A non-limiting example of a suitable propylene-based APO is EASTOFLEX® amorphous polyolefin, available from Eastman Chemical Company.

[0042] In one embodiment, the base polyolefin comprises a first APO which is an ethylene-based APO and a second APO which is a propylene-based APO.

[0043] The hydrolyzable silane monomers used to produce Si-g-PO are silane-containing monomers (hereinafter referred to as "silane" in the same sense) that effectively copolymerize with alpha-olefins (e.g., ethylene or propylene) to form alpha-olefin / silane copolymers (e.g., ethylene / silane copolymers or propylene / silane copolymers), or graft onto alpha-olefin polymers (e.g., polyolefins) and crosslink them to form Si-g-PO. An exemplary hydrolyzable silane monomer has the following structure. [ka] In the formula, R ’ is a hydrogen atom or a methyl group, x and y are either 0 or 1, provided that if x is 1, then y is also 1, and n is an integer between 1 and 12 (inclusive), or between 1 and 4. each ’’ These are independently hydrolyzable organic groups such as alkoxy groups having 1 to 12 carbon atoms (e.g., methoxy, ethoxy, butoxy), aryloxy groups (e.g., phenoxy), araloxy groups (e.g., benzyloxy), aliphatic acyloxy groups having 1 to 12 carbon atoms (e.g., formyloxy, acetyloxy, propanoyloxy), amino or substituted amino groups (alkylamino, arylamino), or lower alkyl groups having 1 to 6 carbon atoms, provided that the three R's ’’ The condition is that one or less of the groups are alkyl.

[0044] Non-limiting examples of suitable hydrolyzable silane monomers include silanes having ethylenically unsaturated hydrocarbyl groups such as vinyl, allyl, isopropenyl, butenyl, cyclohexenyl, or gamma-(meth)acrylooxyallyl groups, and hydrolyzable groups such as hydrocarbyloxy, hydrocarbonyloxy, or hydrocarbylamino groups. Examples of hydrolyzable groups include methoxy, ethoxy, formyloxy, acetoxy, propionyloxy, and alkyl or arylamino groups.

[0045] In one embodiment, the hydrolyzable silane monomer is an unsaturated alkoxysilane such as vinyltrimethoxysilane (VTMS), vinyltriethoxysilane, vinyltriacetoxysilane, gamma-(meth)acrylooxy, propyltrimethoxysilane, and mixtures of these silanes.

[0046] In one embodiment, the base polyolefin for Si-g-PO includes a first APO, which is an ethylene-based APO, and a second APO, which is a propylene-based APO. The ratio of the first APO (ethylene-based APO) to the second APO (propylene-based APO) is 3:1, or 2:1, or 1:1 to 1:2, or 1:3. A radical initiator (peroxide) grafts hydrolyzable silane monomers onto the first APO (ethylene-based APO) and also onto the second APO (propylene-based APO) to form Si-g-PO. In other words, hydrolyzable silane monomers are grafted onto both the first and second APOs. Although not bound by any particular theory, the grafted polyolefins act as compatibilizers for the silicone oil in the final flooding composition, improving miscibility with the silicone oil.

[0047] In one embodiment, the ratio of the first APO (ethylene-based APO) to the second APO (propylene-based APO) present in Si-g-PO is 1:1. The silane is VTMS. 0.01% to 0.05% by weight of a peroxide free radical initiator (generator) grafts VTMS onto the first APO and also grafts VTMS onto the second APO. Si-g-PO has the following properties: (i) 0.1% by weight, or 0.3% by weight, or 0.5% by weight, or 0.8% by weight, or 1.0% by weight, or 1.2% by weight, or 1.5% to 1.8% by weight, or 2.0% by weight, or 2.3% by weight, or 2.5% by weight, or 3.0% by weight of silane (based on the total weight of Si-g-PO), and / or (ii) Having one, some, or all of the Brookfield viscosities of 2,000 cP, 2,500 cP to 2,600 cP, 2,700 cP, or 3,000 cP at 176.6°C.

[0048] In one embodiment, the flooding composition and / or Si-g-PO is either butene-free or otherwise does not contain butene. For example, the flooding composition and / or Si-g-PO is either polybutene and / or polyisobutylene-free or otherwise does not contain polybutene and / or polyisobutylene.

[0049] In one embodiment, the flooding composition and / or Si-g-PO does not contain any composition containing styrene or a styrene-based moiety, or otherwise does not contain such a composition. The flooding composition and / or Si-g-PO does not contain, for example, a styrene block copolymer, or otherwise does not contain such a composition.

[0050] In one embodiment, Si-g-PO consists of (i) a propylene monomer and (ii) an ethylene monomer alone, or otherwise an amorphous polyolefin consisting of these elements alone.

[0051] B. Poly-alpha-olefin oil The flooding composition of the present invention also comprises poly-α-olefin oil. "Poly-α-olefin oil" (or "PAO oil") is a synthetic compound produced by polymerizing at least one α-olefin, and is liquid at 22°C and 1 atm. α-olefins include C2, C6, C8, and C 10 , C 12 , C 14 , and C 20 Any α-olefin, such as α-olefin, may be used. Non-limiting examples of suitable PAO oils include hydrogenated dec-1-ene homopolymers (e.g., DURASYN® 180I and DURASYN® 180R, available from INEOS) and hydrogenated 1-tetradecene polymers having 1-dodecene (e.g., DURASYN® 126, available from INEOS).

[0052] PAO oil has a kinematic viscosity of 1,500 centistokes ("cSt") or less at 40°C. In further embodiments, PAO oil has a kinematic viscosity of 1,000 cSt or less, or 500 cSt or less, or 200 cSt or less, or 100 cSt or less, or 50 cSt or less, or 10 cSt or less at 40°C. In one embodiment, PAO oil has a kinematic viscosity of 10 cSt, or 15 cSt, or 20 cSt, or 30 cSt to 40 cSt, or 50 cSt, or 100 cSt, or 200 cSt, or 500 cSt, or 1,000 cSt, or 1,300 cSt, or 1,500 cSt at 40°C. The viscosity of PAO oil is measured according to ASTM D445.

[0053] C. Polysiloxane The compositions of the present invention include a polysiloxane. As used herein, "polysiloxane" is an organosilicon compound having two or more Si-O-Si bonds. The polysiloxane may be (i) polydimethylsiloxane (or "PDMS"), (ii) hydroxyl-terminated polydimethylsiloxane (or "PDMS-OH"), and (iii) a combination of (i) and (ii).

[0054] In one embodiment, the polysiloxane is polydimethylsiloxane, and will hereafter be referred to as "PDMS" in the same sense. The polydimethylsiloxane has the following structure (1). [ka] In the formula, n is 1, 2, 10, 100, 1,000 to 10,000, 50,000, or 100,000.

[0055] In one embodiment, PDMS has the following characteristics: (i) Number average molecular weight (Mn) of 1,000, or 2,000, or 3,000, or 3,200-3,500, or 4,000, or 5,000, or 7,000, or 10,000, and / or (ii) Having one, some, or all of the following viscosities (kinematic viscosity) at 25°C: 20 cSt, 30 cSt, 40 cSt, 50 cSt to 60 cSt, or 70 cSt.

[0056] Mn is measured by gel permeation chromatography (GPC), and viscosity is measured using a Brookfield viscometer (Model LVF, spindle No. 4, at 12 revolutions / min (rpm)) as described in USP 5,130,041.

[0057] A non-limiting example of a suitable PDMS is the PMX200, available from Dow Corning.

[0058] In one embodiment, the flooding composition of the present invention comprises a hydroxyl-terminated polydimethylsiloxane. The "hydroxyl-terminated polydimethylsiloxane" (or "PDMS-OH") is a PDMS containing a terminal hydroxyl group, as shown in structural formula 2 below. [ka] In the formula, n is 1, 2, 10, 100, 1,000 to 10,000, 50,000, or 100,000.

[0059] In one embodiment, PDMS-OH has the following characteristics: (i) Number average molecular weight (Mn) of 2,500, or 2,500-3,000, or 3,500, or 4,000, and / or (ii) A viscosity (kinematic viscosity) of 50 cSt, or 60 cSt, or 70 cSt, or 72 cSt to 80 cSt, or 90 cSt at 25°C, and / or (iii) Having one, some, or all of the following hydroxyl group content in weight percentage (weight%) based on the weight of OH-PDMS: greater than 0 wt%, or 0.01 wt%, or 0.05 wt%, or 0.07 wt%, or 1.0 wt%, or 1.5 wt% to 2.0 wt%, or 2.5 wt%.

[0060] Mn is measured by gel permeation chromatography (GPC), and viscosity is measured using a Brookfield viscometer (Model LVF, spindle No. 4, at 12 revolutions / min (rpm)) as described in USP5,130,041. Hydroxyl group content is measured using the same method as used in Malaysian Polymer Journal, Vol.4, No.2, pp. 52-61, 2009 and European Polymer Journal, Vol.49, 228-234 (2013). 1 It is measured by 1H NMR spectroscopy or other analytical techniques.

[0061] Non-limiting examples of suitable PDMS-OH include PMX-0156 from Dow Corning and Q3563 from Dow Corning.

[0062] D. Catalyst The flooding composition of the present invention comprises a catalyst. The catalyst crosslinks PDMS-OH by silanol condensation between PDMS-OH and a grafted silane. Although not bound by any particular theory, the crosslinked PDMS-OH component is thought to increase the melt viscosity of the final flooding composition, improve the stability of the flooding composition, raise the dropping point temperature, and reduce oil separation.

[0063] The catalyst may be added to PDMS-OH before adding PDMS-OH to the other components. Alternatively, the catalyst and PDMS-OH may be added simultaneously with the other components, i.e., simultaneously with Si-g-PO and PAO oil.

[0064] Non-limiting examples of suitable catalysts include metal carboxylates such as dibutyltin dilaurate, stannous octanoate, stannous acetate, lead naphthenate, and zinc octanoate; organometallic compounds such as titanium esters and chelates such as tetrabutyl titanate; organic bases such as ethylamine, hexylamine, and piperidine; and acids such as mineral acids, fatty acids, and aromatic sulfonic acids.

[0065] In one embodiment, the catalyst is an organotin compound such as dibutyltin dilaurate, dibutyldimethoxytin, dibutyltinbis(2,4-pentanedionate), or stannous octanoate. Suitable examples of commercially available catalysts in masterbatch form include, but are not limited to, DFDB 5480NT (tin catalyst system), DFDA 5488NT (fast room-temperature curing catalyst masterbatch) from The Dow Chemical Company, or the Borealis AMBICAT® system LE4476.

[0066] In one embodiment, the catalyst is an aromatic sulfonic acid. A non-limiting example of a suitable aromatic sulfonic acid is Aristonic® acid, available from Pilot Chemical Holdings, Inc.

[0067] If a catalyst is present, the flooding composition contains 0.05% by weight, or 0.1% by weight, or 0.15% to 0.2% by weight, or 0.25% by weight, or 0.3% by weight of the catalyst, based on the total weight of the flooding composition. The curing of the flooding composition crosslinks PDMS-OH and Si-g-PO, thereby increasing the viscosity of the flooding composition.

[0068] E. Additives In one embodiment, the flooding composition may optionally contain, but is not limited to, one or more additives selected from antioxidants, rheology modifiers (e.g., thixotropes), thickeners, stabilizers (e.g., UV stabilizers), mineral fillers, polymer fillers, and combinations thereof.

[0069] If used, antioxidants may be present in any conventional amount, such as 0.01 to 1% by weight, or in the range of 0.01 to 0.3% by weight, based on the total weight of the flooding composition. Suitable antioxidants include hindered phenols, e.g., tetrakis[methylene(3,5-di-tert-butyl-4-hydroxyhydro-cinnamate)]methane; bis[(β-(3,5-di-tert-butyl-4-hydroxybenzyl)-methylcarboxyethyl)]sulfides, 4,4'-thiobis(2-methyl-6-tert-butylphenol), 4,4'-thiobis(2-tert-butyl-5-methylphenol), 2,2'-thiobis(4-methyl-6-tert-butylphenol), and thiodiethylenebis(3,5-di-tert-butyl-4-hydroxy)hydrocinnamate; phosphites and phosphonites, e.g., tris(2,4-di-tert Examples of antioxidants or stabilizers include, but are not limited to, 3-(3,5-di-tert-butylphenyl) phosphites and di-tert-butylphenyl-phosphonites; thio compounds, such as dithiolaurylthiodipropionate, dimyristylthiodipropionate, and distearylthiodipropionate; various siloxanes; polymerized 2,2,4-trimethyl-1,2-dihydroquinoline, n,n'-bis(1,4-dimethylpentyl-p-phenylenediamine), alkylated diphenylamines, 4,4'-bis(α,α-dimethylbenzyl)diphenylamine, diphenyl-p-phenylenediamine, mixed diaryl-p-phenylenediamines, and other hindered amine degradation inhibitors or stabilizers. In one embodiment, the antioxidant is [3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], which is commercially available from BASF as IRGANOX® 1035 or Irganox 1010.

[0070] If used, thixotropes may be present in any conventional amount, such as greater than 0 to 5% by weight, or in the range of 6% by weight, based on the total weight of the flooding composition. Examples of suitable thixotropes include, but are not limited to, fumed silica. Suitable commercially available thixotropes include, but are not limited to, AEROSIL® products from Evonik Corp. BYK Industries and Kusumoto Chemicals also supply suitable commercially available thixotropes.

[0071] Non-exclusive examples of thickeners include Kraton® polymers such as SEP(S), SBS, and SEBS copolymers, when used.

[0072] Non-exclusive examples of fillers include inorganic fillers such as silica, calcium carbonate, and combinations thereof, when used.

[0073] In one embodiment, the flooding composition may be free of or substantially free of thixotropes. As used herein, the term “substantially free” means a concentration of less than 10 parts by weight per million based on the total weight of the flooding composition.

[0074] In one embodiment, the flooding composition comprises one or more fillers. Such fillers include, but are not limited to, hollow microspheres (e.g., glass or polymer), mineral inorganic compounds, and polymer fillers. When used, the fillers may be present in any conventional amount, for example, in the range of more than 0% by weight to 60% by weight.

[0075] F. Flooding composition Flooding compositions are prepared by blending Si-g-PO, PAO oil, polysiloxane, and a catalyst. For example, Si-g-PO, PAO oil, polysiloxane, and any optional additives can be blended in a temperature-controlled liquid-operated mixer. For example, the components can be blended in a batch or continuous mixer. Suitable batch mixers include, but are not limited to, Banbury®, Silverson®, and Dynamix® tank mixers and agitators, as well as Littleford® batch mixers. Continuous mixers include twin-screw and single-screw extruders, Farrel® mixers, and Buss® co-kneaders.

[0076] The Si-g-PO described above is present in the flooding compound in amounts ranging from 10% by weight, 20% by weight, 25% by weight, 30% to 35% by weight, 40% by weight, or 45% by weight, based on the total weight of the flooding composition. Within the aforementioned weight percentage range of Si-g-PO, the ratio of the first APO to the second APO is 3:1 to 1:3. The APO ratio is based on the total weight of Si-g-PO. In one embodiment, the ratio of the first APO to the second APO is 3:1, 2.5:1, 2:1, 1.5:1, 1:1 to 1:1.5, 1:2, 1:2.5, or 1:3.

[0077] The PAO oil described above is present in the flooding composition in amounts ranging from 5% by weight, 10% by weight, 20% by weight, 30% to 35% by weight, 40% by weight, 45% by weight, 50% by weight, 55% by weight, or 60% by weight, based on the total weight of the flooding composition.

[0078] The polysiloxanes described above are present in the flooding composition in amounts ranging from 15% by weight, or 20% to 25% by weight, or 30% by weight, or 35% by weight, or 40% by weight, or 50% by weight, or 60% by weight, or 70% by weight, or 80% by weight, or 90% by weight, based on the total weight of the flooding composition.

[0079] The catalyst described above is present in the flooding composition in an amount ranging from 0.05% by weight, 0.1% by weight, or 0.15% to 0.2% by weight, based on the total weight of the flooding composition.

[0080] It is understood that the individual amounts of (A) Si-g-PO, (B) PAO, (C) polysiloxane, and (D) catalyst are added up to 100% by weight of the final flooding composition.

[0081] The resulting flooding composition has an apparent viscosity of 30 cP, or 50 cP, or 100 cP, or 200 cP, or 300 cP, or 400 cP, or 500 cP, or 750 cP, or 900 cP to 1,000 cP, or 1,100 cP, or 1,200 cP, or 1,300 cP, or 1,400 cP, or 1,500 cP, or 1,600 cP, or 1,700 cP, or 1,800 cP, when measured at 150°C according to ASTM D3236.

[0082] In one embodiment, the flooding composition has a dropping point of 80°C or higher, or 95°C, or 100°C, or 110°C, or 120°C, or 130°C to 140°C, or 150°C, or 160°C, or 170°C, or 180°C, or 190°C. The dropping point is determined according to ASTM D127.

[0083] In one embodiment, the flooding composition has an oil separation of less than 0.1, less than 0.05, or less than 0.01 when aged at 21°C for 24 hours. In a further embodiment, the flooding composition has an oil separation of 0, or greater than 0 to 0.01, or 0.05, or less than 0.1 when aged at 21°C for 24 hours. In yet another embodiment, the flooding composition has no oil separation (i.e., 0) when aged at 21°C for 24 hours. Oil separation is determined according to ASTM D1742.

[0084] In one embodiment, the flooding composition is (A) 25% by weight, or 30% to 35% by weight, or 40% by weight of Si-g-PO, (B) 30% by weight, or 35% to 40% by weight of PAO oil, (Ci) 20% by weight, or 25% to 30% by weight of PDMS, (Cii) 5% to 10% by weight of PDMS-OH, (D) Contains 0.1% by weight, or 0.15% to 0.2% by weight of a catalyst, The total amount of components (A), (B), (Ci), (Cii), and (D) reaches 100% by weight of the flooding composition, and the flooding composition has the following properties: (i) Apparent viscosity (at 150°C) of 250 cP, or 300 cP, or 500 cP, or 750 cP to 1,000 cP, or 1,250 cP, or 1,500 cP, and / or (ii) A dropping point of 80°C or higher, or 90°C, or 100°C, or 110°C to 120°C, or 130°C, or 140°C, or 150°C, and / or (iii) When aged at 21°C for 24 hours, it has one, some, or all of the oil separations between 0 and 0.01 or less than 0.1, and is hereafter referred to as compound 1.

[0085] In one embodiment, the Si-g-PO of compound 1 contains a first APO, which is an APO ethylene polymer, and a second APO, which is an APO propylene polymer, in a 1:1 weight percentage ratio based on the weight of the Si-g-PO.

[0086] In one embodiment, the flooding composition is (A) 35% by weight, or 40% to 45% by weight of Si-g-PO, (B) 50% by weight, or 55% to 60% by weight of PAO, (C) 30% by weight, or 35% to 40% by weight of PDMS-OH, (D) Contains 0.1% by weight, or 0.15% to 0.2% by weight of a catalyst, The total amount of components (A), (B), (C), and (D) reaches 100% by weight of the flooding composition, and the flooding composition has the following properties: (i) Apparent viscosity of 250 cP (at 150°C), or 275 cP to 300 cP, and / or (ii) a dropping point of 120°C, or 130°C-140°C, or 150°C, and / or (iii) When aged at 21°C for 24 hours, it has one, some, or all of the oil separations between 0 and 0.01 or less than 0.1, and is hereafter referred to as compound 2.

[0087] In one embodiment, the Si-g-PO of compound 2 contains a first APO, which is an APO ethylene polymer, and a second APO, which is an APO propylene polymer, in a 1:1 weight percentage ratio based on the weight of the Si-g-PO.

[0088] In one embodiment, the flooding composition is (A) 5% by weight, or 10% to 15% by weight of Si-g-PO, (B) 5% by weight, or 10% to 15% by weight, or 20% by weight of PAO oil, (C) 65% by weight, 70% by weight, or 75% to 80% by weight, or 85% by weight of PDMS-OH, (D) Contains a catalyst in an amount of 0.1% to 0.15% by weight, or 0.2% by weight, The total amount of components (A), (B), (C), and (D) reaches 100% by weight of the flooding composition. The flooding composition has the following characteristics: (i) Apparent viscosity of 40 cP, or 50 cP, or 100 cP, or 200 cP, or 300 cP, or 400 cP to 500 cP, or 600 cP, or 700 cP, or 800 cP (at 150°C), and / or (ii) a dropping point of 110°C, or 120°C, or 140°C, or 150°C-160°C, or 170°C, or 180°C, or 190°C, and / or (iii) When aged at 21°C for 24 hours, it has one, some, or all of the oil separations between 0 and 0.01 or less than 0.1, and is hereafter referred to as compound 3.

[0089] In one embodiment, the Si-g-PO of compound 3 contains a first APO, which is an APO ethylene polymer, and a second APO, which is an APO propylene polymer, in a 1:1 weight percentage ratio based on the weight of the Si-g-PO.

[0090] G. Fiber optic cable In one embodiment, an optical fiber cable (also known as an optical fiber) can be prepared, comprising at least one optical fiber, a plurality of buffer tubes, and the flooding composition described above.

[0091] Figure 1 shows a cross-sectional view of a typical loose buffer tube optical fiber cable. In this optical fiber cable design, the buffer tubes 2 are arranged radially around a central reinforcing member 4 and rotate spirally with respect to the tube along its axial length. This spiral rotation allows the cable to be bent without significantly stretching the tube or optical fiber 6.

[0092] If a reduced number of buffer tubes are needed, foam filler rods can be used as low-cost spacers to occupy one or more empty buffer tube positions 10 and maintain the cable shape. The cable sheath 14 can generally be manufactured from polyethylene-based material.

[0093] The flooding composition described above can be used to fill the void 8 surrounding the optical fiber 6 within the buffer tube 2. Furthermore, the flooding composition can be used to surround the buffer tube 2 and fill the void within the cable sheath 14 between them. The flooding composition provides the suspension and protection required in the immediate environment surrounding the fiber, including the removal of air pockets. The flooding composition also provides a barrier against water penetration, which is detrimental to light transmission performance.

[0094] Many other designs for buffer tube cables are possible. Design elements include the size and material of the structure for central strength and tensile members, the dimensions and number of buffer tubes, and the use of metal sheathing and multi-layer outer sheathing materials. Such designs incorporating flooding compositions are contemplated within the scope of this disclosure.

[0095] In one embodiment, the buffer tube is formed from a polypropylene copolymer (cPP) (for example, ESCORENE® 7132, an impact copolymer available from Exxon Chemical Company).

[0096] In one embodiment, the cable sheath is made of high-density polyethylene (HDPE) (e.g., DGDA-6318BK, 0.954 g / cm³, available from The Dow Chemical Company). 3 "High-density polyethylene" (or "HDPE") is an ethylene-based polymer having a density of at least 0.94 g / cc, or at least 0.94 g / cc to 0.98 g / cc. HDPE has a melt index of 0.1 g / 10 min to 25 g / 10 min, as measured according to ASTM D1238, conditions 190°C / 2.16 kg.

[0097] The optical fiber cables described above can typically be manufactured in a series of sequential manufacturing steps. The optical transmission fibers are usually manufactured in the first step. The fibers may have a polymer coating for mechanical protection. These fibers are assembled into bundles or ribbon cable configurations, or incorporated directly into the cable fabrication.

[0098] Optical protection components can be manufactured using an extrusion process. Typically, a single-screw plasticizing extruder discharges flux and a mixed polymer under pressure to a crosshead of a wire or cable. The crosshead rotates the molten flow perpendicular to the extruder, shaping the flow into the molten components. For buffer tubes and core tubes, one or more optical fibers or fiber assemblies and flooding compositions are fed to the back of the crosshead, exit the crosshead in the molten tube, and are cooled and solidified in a water trough system. This component is finally collected on a winding reel as a finished component.

[0099] To manufacture components made from two or more material layers, there are typically separate plasticizing extruders that feed the molten composition to a multilayer crosshead, where it is molded into the desired multilayer structure.

[0100] Slotted core components and other extruded morph components are typically extruded in a similar extrusion process incorporating appropriate mold dies, and then later combined with optical fiber components to produce a finished cable.

[0101] A tension system is used to supply the fiber components to the tube fabrication process in order to control the length of excess fiber. Furthermore, the material selection of the components, the tube extrusion and crosshead equipment, and the processing conditions are optimized to provide finished parts in which post-extrusion shrinkage does not cause excessive slack in the optical fiber components.

[0102] The extruded optical protection components, along with other components such as central components, armor wires, and wraps, are then processed in one or more subsequent steps to produce the finished cable configuration. This typically involves processing the cable wiring after assembling the components in a fabrication extruder / crosshead, and then applying the polymer sheath.

[0103] Herein, as examples rather than limitations, several embodiments of the present disclosure will be described in detail in the following examples. [Examples]

[0104] The materials used in the comparative sample (CS) and the example (IE) of the present invention are provided in Table 1 below. [Table 2]

[0105] 1. Preparation of Si-g-PO The materials used in the production of silane-grafted polyolefins (Si-g-PO) are provided in Table 2 below. [Table 3]

[0106] Table 2 above shows the components and quantities used in the preparation of silane-grafted polyolefins.

[0107] Weigh the materials listed in Table 2 and place them in glass bottles. Preheat the bottles in a 40°C oven for 2 hours. Add the mixture of VTMS and L101 to the glass bottles containing the pre-weighed / preheated resin. Place the screw caps on top of the bottles and shake the sealed bottles at 60°C for 2 hours until the pellets are visibly dry. After shaking the bottles (at 40°C), return them to the oven. Place the immersed pellets in a beaker and melt them by heating to 130°C. Mix the materials at 185-190°C at 45 rpm for 15 minutes. Flatten the hot materials by placing them between Mylar® sheets in a compression molding press set to room temperature and high pressure for 10 minutes. Place the materials in a moisture bag for later use. Measure the Brookfield viscosity at 176.6°C. Melt and mix the resins together at 160°C. The Brookfield viscosity of the resulting Si-g-PO is shown in Table 2.

[0108] 2. Preparation of the flooding composition Using the Si-g-PO resins listed in Table 2 as the base resin, the flooding compositions shown in Table 3 are produced. The DBTDL or aristonic acid catalyst is mixed with the polysiloxane fluid at room temperature for approximately 5 minutes using a three-blade lab stirrer to ensure a uniform distribution before the reaction.

[0109] The resin is heated and melted in a steel paint can on a hot plate equipped with a three-blade overhead lab stirrer. The resin is heated to 160-170°C while stirring, and then cooled to 100°C. The oil to be used in the formulation is then added to the mixture along with the polysiloxane fluid / catalyst mixture while stirring. The mixture is then heated to 180-190°C for 15 minutes while stirring.

[0110] The characteristics of the comparative sample (CS) and the embodiment of the present invention (IE) are shown in Table 3 below. [Table 4]

[0111] The first three samples in Table 3 (CS2, CS3, and CS4) show the effect of the catalyst on the viscosity of the PDMS-OH fluid. The PDMS-OH fluids containing the CS2 and CS3 catalysts were prepared by first mixing the catalyst with the PDMS-OH fluid at room temperature, and then heating at 180-190°C for 15 minutes with stirring. CS3 shows that the DBTDL catalyst does not affect the viscosity under the reaction conditions used here. However, CS4 shows that the sulfonic acid catalyst imparts an increase in viscosity after the heating step. Therefore, the remaining formulations shown in Table 3 utilize the sulfonic acid catalyst.

[0112] A flooding composition is considered successful (good) if no oil separation occurs and the final product is a soft, stable gel or paste with Brookfield viscosity in the range of 30–1,800 cP at 150°C.

[0113] CS5, containing approximately 90% by weight of PDMS-OH, does not show oil separation, but the sample is quite rubbery in consistency. CS7 shows that a 60% by weight polysiloxane fluid containing approximately 40% grafted resin exhibits oil separation.

[0114] When CS19 is used in formulations containing 30% by weight of PDMS and 30% of PDMS-OH (60% silicone fluid in total), typical results show that the oil separates from the polymer, resulting in a product that does not form a stable gel. Similar results occur with CS17 containing approximately 55% by weight of PDMS oil (60% by weight of silicone fluid in total) and CS18 containing 50% silicone fluid. When the amount of Si-g-PO resin is increased to 40-50% by weight in CS18, the viscosity increases significantly, and oil separation still occurs in the final product.

[0115] IE2 shows that 30% by weight PDMS oil / 30% by weight silicone oil used in combination with PAO and 5% by weight PDMS-OH fluid (PMX-0156), as well as the catalyst in the formulation, produces a stable soft gel without oil separation and still maintains a low viscosity (545 cP) at 150°C. IE4 shows a stable gel without oil separation containing 60% by weight total oil (and 30% by weight total silicone fluid), as well as the same components at the same levels but different levels from IE1, producing a stable gel without oil separation and maintaining a low viscosity (250 cP) at 150°C. Both IE1 and IE4 show no oil separation, maintain low viscosity, and achieve a dropping point of 80°C.

[0116] CS13 is similar to IE3 and IE4, but has a lower level of aristonic acid, which indicates oil separation that is unacceptable for CS13.

[0117] CS14, CS15, and CS16 support the requirements for each component in the IE3 and IE4 examples, where removing one component from IE4 results in oil separation in each case for CS14, CS15, and CS16.

[0118] IE6, IE7, and IE8 demonstrate that a stable gel can be achieved using a large amount of PDMS-OH (70-85% by weight).

[0119] This disclosure is not limited to the embodiments and examples contained herein, but is particularly intended to include modified forms of these embodiments, including some embodiments and combinations of elements of different embodiments, within the scope of the following claims.

Claims

1. A flooding composition, wherein the weight percentage (weight%) of the composition is: (A) 10% to 40% by weight of silane-grafted polyolefin (Si-g-PO), (B) 35% to 50% by weight of poly-α-olefin oil (PAO oil), (Ci) 20% to 30% by weight of polydimethylsiloxane (PDMS), (Cii) 5% to 10% by weight of hydroxyl-terminated polydimethylsiloxane (PDMS-OH), (D) A flooding composition comprising 0.1% to 0.2% by weight of a catalyst, characterized in that it does not exhibit oil separation when left standing at 21°C for 24 hours as measured according to ASTM D1742.

2. The flooding composition according to claim 1, wherein the Si-g-PO comprises two types of base polyolefins: an ethylene-based polymer and a propylene-based polymer.

3. The flooding composition according to claim 2, wherein the Si-g-PO comprises a first amorphous polyolefin (APO) which is an APO ethylene-based polymer and a second APO which is an APO propylene-based polymer.

4. The flooding composition according to claim 3, wherein the weight ratio of the first APO ethylene polymer to the second APO propylene polymer is 3:1 to 1:3 based on the total weight of the Si-g-PO.

5. The flooding composition according to claim 1, wherein the flooding composition has an apparent viscosity of 30 cP to 1,800 cP at 150°C when measured according to ASTM D3236.

6. The flooding composition according to claim 5, having a dropping point of 80°C or higher when measured according to ASTM D127.

7. (A) 25% to 40% by weight of the Si-g-PO, (B) 35% to 40% by weight of the PAO oil, (Ci) 20% to 30% by weight of PDMS, (Cii) 5% to 10% by weight of PDMS-OH, (D) comprising 0.1% to 0.2% by weight of the catalyst, The flooding composition according to claim 6, wherein the flooding composition has an apparent viscosity of 250 cP to 1,500 cP.

8. The flooding composition according to claim 7, wherein the flooding composition has a dropping point of 80°C or higher to 150°C.

9. (A) 35% to 40% by weight of the Si-g-PO, (B) 35% to 50% by weight of the PAO oil, (C) 5% to 10% by weight of PDMS-OH, (D) comprising 0.1% to 0.2% by weight of the catalyst, The flooding composition according to claim 6, wherein the flooding composition has an apparent viscosity of 250 cP to 300 cP.

10. The flooding composition according to claim 9, wherein the flooding composition has a dropping point of 120°C to 150°C.

11. (A) 10% to 15% by weight of the Si-g-PO, (B) 35% to 40% by weight of the PAO oil, (C) 5% to 10% by weight of PDMS-OH, (D) comprising 0.1% to 0.2% by weight of the catalyst, The flooding composition according to claim 6, wherein the flooding composition has an apparent viscosity of 40 cP to 800 cP.

12. The flooding composition according to claim 11, wherein the flooding composition has a dropping point of 110°C to 190°C.

13. It is a fiber optic cable, Buffer tube and At least one optical fiber in the buffer tube, A flooding composition, wherein the weight percentage (weight%) of the composition is: (A) 10% to 40% by weight of silane-grafted polyolefin (Si-g-PO), (B) 35% to 50% by weight of poly-α-olefin oil (PAO oil), (Ci) 20% to 30% by weight of polydimethylsiloxane (PDMS), (Cii) 5% to 10% by weight of hydroxyl-terminated polydimethylsiloxane (PDMS-OH), and (D) A flooding composition comprising 0.1% to 0.2% by weight of a catalyst, and an optical fiber cable comprising these.

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