Bitumen blend compositions

Abstract

Provided are bitumen blend compositions useful in roofing applications. A bitumen blend composition comprises a bitumen component in an amount in the range of from 60 wt. % to 99 wt. %. a modifier in an amount in the range of from 1 wt. % to 40 wt. %. and a filler in an amount in the range of from 0 wt. % to 45 wt. %, wherein the modifier comprises a thermoplastic polyolefin component and a polyolefin recyclate component. Also provided are membranes comprising the bitumen blend composition.

Description

BITUMEN BLEND COMPOSITIONSFIELD OF THE INVENTION

[0001] The present disclosure relates to mixtures of bitumen and polymer compositions, in particular polymer compositions comprising a polyolefin recyclate. Such mixtures have utility in roofing applications.BACKGROUND OF THE INVENTION

[0002] There has been much research and development by industry to develop end-use applications that incorporate PCR resins and have quality and / or performance similar or equal to corresponding end-use applications fabricated from virgin polymers. Existing and new environmental regulations provide continued motivation to develop suitable commercial uses of PCR resins while reducing the amount of waste plastics to landfill. Successful development of these commercial pathways will create demand for products incorporating PCR resins.

[0003] Plastic waste is typically segregated by polymer type. Recyclates of polypropylene (PP) and high density polyethylene (HDPE) typically have a low melt flow rate or a low melt index, respectively. Such high melt viscosities make these polyolefin recyclates difficult to process and limit the end-use applications in which they can be used directly. Another limitation for the use of recycled polyolefins is poor organoleptic properties, such as, but not limited to, the presence of unpleasant odors, taste, and / or unintended color coming from volatile organic compounds which may have been absorbed in these polymers during their usage. It would be desirable to have end uses for polymer recyclates where such characteristics are unimportant thus eliminating the need for processing steps to modify these characteristics.

[0004] Mixtures, comprising bitumen and polymer compositions, useful in preparation of roofing, waterproofing sheet, or road paving materials are disclosed in WO2021213896A1. Such polymer compositions are introduced in bitumen in order to modify its characteristics and make it more suitable for the use for which it is destined. However, use of significant amounts of virgin polymers in such blends, while achieving improvements in handling and application of bitumen compounds in certain end uses, may not be effective from a cost standpoint.

[0005] It would be desirable to develop dispositions for PCR resins that do not require costly reprocessing steps. It would further be desirable to develop bitumen / polymer blends that provide desired performance characteristics at a lower cost.SUMMARY OF THE INVENTION

[0006] The present disclosure relates to bitumen blend compositions comprising a bitumen component in an amount in the range of from 60 wt. % to 99 wt. %, a modifier in an amount in the range of from 1 wt. % to 40 wt. %. and a filler component in an amount in the range of from 0 wt. % to 45 wt. %. The modifier comprises a thermoplastic polyolefin component and a polyolefin recyclate component. The wt. % of each component is based on the total combined weight of the bitumen component, the modifier, and the filler.

[0007] In some embodiments, the bitumen is present in the bitumen blend composition as a dispersed phase in a matrix phase of the modifier.

[0008] In some embodiments, the modifier comprises the thermoplastic polyolefin component in an amount in the range of from 1 wt. % to 99 wt. %, and the polyolefin recyclate component in an amount in the range of from 1 wt. % to 99 wt. %, wherein wt. % is based on the total weight of the thermoplastic polyolefin component and the polyolefin recyclate component.

[0009] In some embodiments, the thermoplastic polyolefin component comprises: i) a first heterophasic copolymer, wherein a propylene homopolymer or a random copolymer (RACO) with ethylene is mixed with a bipolymer; ii) a second heterophasic copolymer containing three components: A) a semi-crystalline propylene homopolymer, or random copolymer with ethylene or other alpha-olefins; B) a polyethylene homopolymer, or a polyethylene copolymer with 1- butene or other alpha-olefins; and C) an elastomeric component consisting of a copolymer of propylene, ethylene, and optionally 1 -butene; or iii) a combination thereof.

[0010] In another aspect, a membrane is provided having a layer comprising the bitumen blend composition.

[0011] The foregoing has outlined rather broadly the features and technical advantages of the present invention in order that the detailed description of the invention that follow s may be better understood. Additional features and advantages of the invention will be described hereinafter, which form the subject matter of the claims of the invention. It should be appreciated by those skilled in the art that the conception and specific embodiments disclosed may be readily utilized as a basis for modifying or designing other processes for carry ing out the same purposes of the present invention. It should also be realized by those skilled in the art that such equivalent processes do not depart from the spirit and scope of the invention as set forth in the appended claims. The novel features which are believed to be characteristic of the invention, both as to its structure and method of manufacture, together with further objects and advantages will be better understood from the following description.DETAILED DESCRIPTION OF THE INVENTION

[0012] Illustrative embodiments of the subject matter claimed below will now be disclosed. In the interest of clarity, some features of some actual implementations may not be described in this specification. It will be appreciated that in the development of any such actual embodiments, numerous implementation-specific decisions must be made to achieve the developer’s specific goals, such as compliance with system-related and business-related constraints, which will vary from one implementation to another. Moreover, it will be appreciated that such a development effort, even if complex and time-consuming, would be a routine undertaking for those of ordinary skill in the art having the benefit of this disclosure.

[0013] The words and phrases used herein should be understood and interpreted to have a meaning consistent with the understanding of those words and phrases by those skilled in the relevant art. No special definition of a term or phrase, i.e., a definition that is different from the ordinary and customary meaning as understood by those skilled in the art, is intended to be implied by consistent usage of the term or phrase herein. To the extent that a term or phrase is intended to have a special meaning, i.e., a meaning other than the broadest meaning understood by skilled artisans, such a special or clarifying definition will be expressly set forth in the specification in a definitional manner that provides the special or clarifying definition for the term or phrase. It must also be noted that, as used in the specification and the appended claims, the singular forms “a,” “an,” and “the” include plural references unless otherwise specified.

[0014] For example, the following discussion contains a non-exhaustive list of definitions of several specific terms used in this disclosure (other terms may be defined or clarified in a definitional manner elsewhere herein). These definitions are intended to clarify the meanings of the terms used herein. It is believed that the terms are used in a manner consistent with their ordinary7meaning, but the definitions are nonetheless specified here for clarify.Definitions

[0015] All concentrations herein are by weight percent (“wt. %”) unless otherwise specified.

[0016] As used herein, “about” means the stated value plus or minus the margin of error of measurement or plus or minus 10% if no method of measurement is indicated.

[0017] As used herein, “bipolymer” is a specific type of copolymer that has elastomeric properties and a sufficient co-monomer content to create a partially amorphous phase, about 10% or more comonomer. A bipolymer is one component of the final polymer composition of a PP heterophasic copolymer or a rTPO.

[0018] As used herein, “bitumen” means a substance produced through the distillation of crude oil. Bitumen is known for its waterproofing and adhesive properties and is commonly used inroofing applications, such as but not limited to bituminous waterproofing membranes. Production of bitumen occurs through distillation, which removes lighter components from crude oil to produce target products like gasoline and diesel, leaving the heavier bitumen behind. Deposits can also occur naturally at the bottom of ancient lakes, where prehistoric organisms have decayed and been subjected to heat and pressure.

[0019] As used herein, ‘'comprising” is to be interpreted as specifying the presence of the stated features, integers, steps, or components as referred to, but does not preclude the presence or addition of one or more features, integers, steps, or components, or groups thereof. Moreover, each of the terms “by”, “comprising,” “comprises”, “comprised of’ “including,” '‘includes,” “included,” “involving,” "involves,” “involved,” and “such as” are used in their open, non-limiting sense and may be used interchangeably. Further, the term “comprising” is intended to include examples and aspects encompassed by the terms “consisting essentially of’ and “consisting of.” Similarly, the term “consisting essentially of’ is intended to include examples encompassed by the term “consisting of.”

[0020] As used herein, “consisting essentially of’ excludes additional material elements, but allows the inclusions of non-material elements that do not substantially change the nature of the invention.

[0021] As used herein, “consisting of’ is closed and excludes all additional elements.

[0022] As used herein, “conversion” is used to denote the percentage of a component fed which disappears across a reactor.

[0023] As used herein, “copolymer” refers to a polyolefin polymer that contains two types of alpha-olefin monomer units.

[0024] As used herein, “HDPE” means ethylene homopolymers and ethylene copolymers produced in a suspension, solution, slurry, or gas phase polymerization process and having a density in the range of 0.940 g / cm3to 0.970 g / cm3.

[0025] As used herein, “heterophasic copolymer” or “heco” refers to a reactor blend of homopolymers and / or copolymers that contains two components: A) a semi-crystalline polypropylene matrix and B) a bipolymer component. The polypropylene matrix may be a homopolymer (HOMO) PP or a random copolymer (RACO) PP of propylene with ethylene or other alpha-olefins. The bipolymer is dispersed within the semi-crystalline polypropylene matrix.

[0026] As used herein, “homopolymer” or “HOMO” refers to a polymer consisting solely or essentially of units derived from a single kind of monomer, e.g., polyethylene homopolymer is a polymer comprised solely or essentially of units derived from ethylene, and polypropylene homopolymer is a polymer comprised solely or essentially of units derived from propylene.

[0027] As used herein, “intrinsic viscosity7’ refers to the measure of a solute’s contribution to the viscosity of a solution. Here, the solution used is decalin at 135°C, unless otherwise specified. The ‘solute’ can be the base resin or one of the base resin’s individual components or copolymers or bipolymers or the fraction of the base resin that is soluble in xylene at room temperature. Room temperature is approximately 25°C.

[0028] As used herein, “LDPE” means ethylene homopolymers and / or ethylene copolymers produced in a high pressure free radical polymerization and having a density in the range of 0.910 g / cm3to 0.940 g / cm3.

[0029] As used herein, “LLDPE” means ethylene copolymers produced in a suspension, solution, slurry, or gas phase polymerization process and having a density in the range of 0.910 g / cm3to 0.940 g / cm3.

[0030] As used herein, “MDPE” means ethylene copolymers produced in a suspension, solution, slurry, or gas phase polymerization process and having a density in the range of 0.925 g / cm3to 0.940 g / cm3.

[0031] As used herein, “melt flow rate” and “MFR” are used interchangeably to refer to the measure of the ability of the melt of the base resin to flow under pressure. The melt flow rate can be determined by ASTM D 1238L (“Standard Test Method for Melt Flow Rates of Thermoplastics by Extrusion Plastometer”), both of which measure the melt flow rate at 230°C and 2. 16 Kg of weight. The “melt flow range” is a range of melt flow rates.

[0032] As used herein, “olefin” and alternatively referred to as “alkene,” is a linear, branched, or cyclic compound of carbon and hydrogen having at least one double bond.

[0033] As used herein, “polyolefin recyclate” means post-consumer recycled (“PCR”) polymer and / or post-industrial recycled (“P1R”) polymer. Polyolefin recyclate is derived from an end product that has completed its life cycle as a consumer item and would otherwise be disposed of as waste (e.g., a polyethylene water bottle) or from plastic scrap that is generated as waste from an industrial process.

[0034] As used herein, “polyolefin” in some embodiments is a type of polymer with the general formula (CH2CHR)nwhere R is an alkyl group, including, but not limited to LDPE, LLDPE, MDPE, HDPE, and PP. PP consists of, but is not limited to, propylene homopolymers, random copolymer, impact (heterophasic or block) copolymers and compounds thereof.

[0035] As used herein, “processability” refers to how well a polymer composition can be formed into a film (cast, blown, water quenched or mono or biaxially oriented) of commercial quality or molded by injection, compression or rotational molding or extruded into a fiber, sheet, coating, corrugated board, profile or thermoformed or other form into an article of commercial quality at commercially acceptable rates using the equipment and conditions.

[0036] As used herein, “thermoplastic polyolefins7’ or “TPOs” are used to refer to polyolefins that become pliable or moldable above a specific temperature and solidify upon cooling. The terms “Reactor made thermoplastic polyolefins” or “reactor thermoplastic polyolefins” or “rTPO” are used interchangeably to refer to thermoplastic polyolefins that are made in a reactor system. The present disclosure uses two types of rTPOs for its foamed compositions. The first is a heterophasic copolymer having a semi-crystalline polypropylene matrix with greater than 30% bipolymer content by weight. The second rTPO has a semi- crystalline polypropylene matrix with a polyethylene homopolymer or a polyethylene copolymer with 1 -butene or other alpha olefin, and, an elastomeric component consisting of a copolymer of propylene, ethylene, and optionally 1- butene. The first and second heterophasic polymers disclosed herein are rTPOs.

[0037] As used herein, “virgin” with respect to polymers, means pre-consumer polymers. Preconsumer polymers are obtained directly or indirectly from petrochemical, bio-based renewable and advanced chemical recycled polyolefin recy elate feedstocks fed to a polymerization apparatus. Pre-consumer polyolefins can be subjected to post polymerization processes such as. but not limited to, extrusion, pelletization, visbreaking, devolatization, oligomer removal, steam treatment, compounding and / or other processing completed before the product reaches the enduse consumer. In some embodiments, virgin polymer may have a single heat history. In some embodiments, a virgin polymer has more than one heat history. In some embodiments, a virgin polymer comprises no additives. In some embodiments, a virgin polymer comprises additives.

[0038] As used herein, “a-olefin” or “alpha-olefin” means an olefin of the general formula CH2=CH — R, wherein R is a linear or branched alky l containing from 1 to 10 carbon atoms. The a-olefin can be selected, for example, from propylene, 1-butene, 1-pentene, 1-hexene. 1-octene. 1- dodecene, and the like.

[0039] In the present description, the terms “monomer” and “comonomer” are used interchangeably. The terms mean any compound with a polymerizable moiety that is added to a reactor in order to produce a polymer. In those instances in which a polymer is described as comprising one or more monomers, e.g., a polymer comprising propylene and ethylene, the polymer, of course, comprises units derived from the monomers, e.g., — CH2 — CH2 — , and not the monomer itself, e.g., CH2=CH2. For example, when a copolymer is described as having an “ethylene” content of 35 wt.% to 55 wt.%, it is understood that the mer unit in the copolymer is derived from ethylene in the polymerization reaction and the derived units are present at 35 wt.% to 55 wt.%, based upon the weight of the copolymer.Polvmer-modified bitumen

[0040] Disclosed herein are bitumen blend compositions comprising a bitumen component, a modifier, and optionally a filler. The modifier herein is a polymer blend comprising athermoplastic polyolefin (TPO) and a polyolefin recyclate. The bitumen blend composition is produced by melt blending the bitumen component and the modifier in amounts sufficient to result in the bitumen blend composition having a dispersed phase of bitumen particles in a continuous matrix phase of the modifier. When bitumen is melt blended with a sufficient amount of the modifier, incompatibility of the bitumen and the modifier results in a bitumen blend composition comprising a matrix phase of the modifier having a dispersed phase of domains of the bitumen.

[0041] A bitumen blend composition herein comprises bitumen in an amount in the range of from 60 wt. % to 99 wt. %, a modifier in an amount in the range of from 1 wt. % to 40 wt. %, and a filler component in an amount in the range of from 0 wt. % to 45 wt. %, wherein wt. % is based on the total combined weight of the bitumen component, the modifier, and the filler.Bitumen

[0042] Modified bitumen roof membranes comprise bitumen to improve several properties. Bitumen increases the overall toughness and resistance to wear and tear, making the membrane more durable. Bitumen allows the membrane to remain flexible at various temperatures, reducing the risk of cracking in cold weather. Bitumen is inherently waterproof, enhancing the membrane’s ability to prevent water ingress and providing excellent moisture resistance. Bitumen aids in protecting the membrane from UV radiation, which can degrade the material over time. Bitumen improves the adhesive properties of the membrane, ensuring better bonding to the roof surface and seams, reducing the risk of leaks. Bitumen adds to the thermal stability of the membrane, helping it withstand high temperatures without losing its structural integrity. The addition of bitumen improves the elastic properties of the membrane, allowing it to expand and contract with temperature changes without damage.Modifier

[0043] The modifier comprises a thermoplastic polyolefin component and a polyolefin recyclate component. The TPO component comprises one or more first heterophasic copolymers as described herein, one or more second heterophasic copolymers as described herein, or a combination thereof. In some embodiments, the thermoplastic polyolefin component in an amount in the range of from 1 wt. % to 99 wt. %, and the polymer recyclate component in an amount in the range of from 1 wt. % to 99 wt. %.

[0044] In some embodiments, the modifier has a viscosity at 190°C (ASTM-4402) in the range of from 1,000 cP to 10.000 cP, from 1.500 cP to 9,000 cP, or from 2,000 cP to 8,000 cP.- TPO

[0045] In some embodiments, the TPO component comprises a first heterophasic copolymer, wherein a propylene homopolymer or a random copolymer (RACO) with ethylene is mixed with a bipolymer. In some embodiments, the TPO component comprises a second heterophasiccopolymer containing three components: A) a semi-crystalline propylene homopolymer, or random copolymer with ethylene or other alpha-olefins; B) a polyethylene homopolymer, or a polyethylene copolymer with 1 -butene or other alpha-olefins; and, C) an elastomeric component consisting of a copolymer of propylene, ethylene, and optionally 1 -butene. In some embodiments, the TPO component comprises one of more first heterophasic copolymers, one or more second heterophasic copolymers, or a combination thereof.+ First heterophasic copolymers

[0046] A first ty pe of first heterophasic copolymer comprises:(A) from about 8 to about 25% by weight of a crystalline polymer fraction selected from the group consisting of (i) a propylene homopolymer having solubility in xylene at room temperature lower than 10% by weight; and (ii) a copolymer of propylene and at least one alpha-olefin of formula H2C=CHR, where R is H or a C2-C6 linear or branched alkyl, containing at least 85% by weight of propylene, having solubility in xylene at room temperature lower than 15% by weight; and(B) from about 75 to about 92% by weight of an elastomeric fraction comprising(i) a first elastomeric copolymer of propylene with at least one alpha-olefin of formula H2C=CHR, where R is H or a C2-C6 linear or branched alkyl, optionally containing 0.5 to 5% by weight of a diene, the first elastomeric copolymer containing from about 15 to 32% by weight alpha-olefin, and having solubility in xylene at room temperature greater than 50% by weight, the intrinsic viscosity of the xylene soluble fraction ranging from about 3.0 to 5.0 dl / g; and(ii) a second elastomeric copolymer of propylene with at least one alpha-olefin of formula H2C=CHR, where R is H or a C2-C6 linear or branched alkyl, optionally containing 0.5 to 5% by weight of a diene, the second elastomeric copolymer containing more than 32% up to 45% by weight alpha-olefin, and having solubility in xylene at room temperature greater than 80% by weight, the intrinsic viscosity of the xylene soluble fraction ranging from about 4.0 to 6.5 dl / g; wherein the (b.i)Z(b.ii) weight ratio ranges from about 1:5 to 5: 1.

[0047] The total w eight of (A) + (B) is 100 wt%. In further embodiments of the first type of first heterophasic copolymer has: a flexural modulus lower than 60 MPa: a Shore A hardness low er than 90; a tension set at 100% lower than 35%; a melt flow rate between 0.1 and 10 g / 10 min., wherein the melt flow rate values are measured according to ASTM D 1238; or any combination thereof.

[0048] A second type of first heterophasic copolymer comprises:(A) from about 10 to 70% by weight of a copolymer of propylene and one or more comonomers) selected from ethylene and CH2=CHR alpha-olefins where R is a 2-8 carbon alky l, wherein the copolymer contains from about 0 to 8% of co-monomer(s); and(B) from about 30 to 90% by weight of a copolymer of ethylene and (i) propylene or (ii) CH2=CHR alpha-olefins, where R is a 2-8 carbon alkyl radical, or (iii) a combination thereof, optionally with minor amounts of a diene, with this copolymer containing from about 50% to 80% of ethylene.

[0049] The total weight of (A) + (B) is 100 wt%. In further embodiments of the second type of first heterophasic copolymer has an intrinsic viscosity 11] | of a fraction soluble in xylene at room temperature (XS) of 1.8 dl / g or more.

[0050] A third ty pe of first heterophasic copolymer comprises:(A) from 30% to less than 70% of a semi-crystalline polypropylene component selected from the group consisting of a propylene homopolymer, a random copolymer of propylene containing up to 8% of ethylene, a random copolymer of propylene containing up to 8% of at least one C4-C10 a-olefin, or any combination thereof, wherein the semi-cry stalline polypropylene component has a monomodal molecular weight distribution; and(B) greater than 30% to about 70% of a bipolymer component of propylene and at least one co-monomer selected from ethylene and / or C4-C10 a-olefins, wherein the bipolymer itself has from about 50% to about 75% of propylene, wherein the bipolymer is partially soluble in xylene at room temperature and has an intrinsic viscosity of from about 4 to 7.5 dl / g (in decalin).

[0051] The total weight of (A) + (B) is 100 wt%. In further embodiments of the third type of first heterophasic copolymer has: a MFR between 0.35 and 1 g / 10 min.; an intrinsic viscosity7of the xylene soluble fraction from about 4 dL / g to 6 dL / g (in decalin); or a combination thereof.

[0052] A fourth type of first heterophasic copolymer comprises:(A) from about 60 to 85% by weight of a broad molecular weight distribution propylene polymer having a poly dispersity index from about 5 to 15 and melt flow rate of from about 40 to 75 g / 10 min.; and(B) from about 15 to 40% by weight of a partially xylene-soluble olefin polymer rubber consisting of a poly(ethylene-co-propylene) containing at least 65% by weight of ethylene, wherein the xylene-insoluble content of (B) is 25- 40% by' weight, measured by dissolving the polymer in xylene at 135°C, cooling the solution to 25°C, allowing to settle for 30 minutes, followed by filtering;

[0053] The total weight of (A) + (B) is 100 wt%. In further embodiments of the fourth ty pe of first heterophasic copolymer has a MFR in the range of from 5 to 20 g / 10 min.

[0054] A fifth type of first heterophasic copolymer comprises:(A) from about 25 to 50% by weight of a crystalline propylene homopolymer with a solubility in xylene at room temperature of less than or equal to 4%. or a crystalline copolymer of propylene with ethylene or a C4-Cs alpha-olefin having an ethylene or alpha-olefin content 0.5 to 3%, and a solubility' in xylene at room temperature of from less than or equal to 4%; and(B) from about 50 to 75% by weight of a partially amorphous copolymer of ethylene with a C4-C8 alpha-olefin, wherein the alpha-olefin content is from about 10 to 20%, and the copolymer is from about 10 to 40% soluble in xylene at room temperature.

[0055] The total weight of (A) + (B) is 100 wt.+ Second heterophasic copolymers

[0056] A first type of second heterophasic copolymer comprises:(A) from about 5 to 35% by weight of a propylene-based polymer containing 90% by weight or more of propylene units and 10% by weight or less of a fraction soluble in xylene at 25 °C;(B) from about 25 to 50% by weight of an ethylene homopolymer containing 5% by weight or less of a fraction soluble in xylene at 25°C; and(C) from about 30 to 60% by weight of a copolymer of ethylene and propylene containing from about 25% to 75% by weight of ethylene units and containing from about 55% to 95% by weight of a fraction soluble in xylene at 25°C.

[0057] The total weight of (A) + (B) + (C) is 100 wt%. In further embodiments of the first type of second heterophasic copolymer has: a total content the ethylene units (as determined by infrared analysis) of 50% by weight or higher; a melt flow rate between 1.0 and 5.0 g / 10 min.; or a combination thereof.

[0058] A second type of second heterophasic copolymer comprises:(A) from about 5 to 35% by weight of a propylene-based polymer containing 90% by weight or more of propylene units and 10% by weight or less of a fraction soluble in xylene at 25°C;(B) from about 25 to 50% by weight of a copolymer of ethylene and a Cs-Cs alpha-olefin containing from about 0.1% to 20% by weight of alpha-olefin units and 75% by weight or less of a fraction soluble in xylene at 25°C; and(C) from about 30 to 60% by weight of a copolymer of ethylene and propylene containing from about 25% to 75% by weight of ethylene units and containing from about 55% to 95% by weight, of a fraction soluble in xylene at 25°C.

[0059] The total weight of (A) + (B) + (C) is 100 wt%. In further embodiments of the second type of second heterophasic copolymer has: a total content of the Cs-Cs alpha-olefin units (as determined by infrared analysis) of 3% by weight or higher; a melt flow rate between 0. 1 and 6 g / 10 min.; or a combination thereof.

[0060] A third ty pe of second heterophasic copoly mer comprises:(A) from about 10 to 60% by weight of a homopolymer of propylene with isotactic index greater than 80, or a copolymer having over 85% by weight of propylene with (i) ethylene or (ii) CH2=CHR alpha-olefins, where R is a 2-8 carbon alky l radical, or combinations of (i) and (ii);(B) from about 5 to 20% parts by weight of a copolymer fraction containing ethylene that is insoluble in xylene at ambient temperature; and(C) from about 37 to 80% by w eight of a copolymer fraction of ethylene and (i) propylene or (ii) another CH2=CHR a-olefin, or combinations of (i) and (ii), and, optionally, minor portions of a diene, wherein component (C) is less than 40% by weight of ethylene, being soluble in xylene at ambient temperature, and having an intrinsic viscosity from about 1.5 to 5 dl / g;

[0061] The total w eight of (A) + (B) + (C) is 100 wt%, and the percent by w eight of the sum of the (B) and (C) components with respect to the total polyolefin composition is from about 40% to 90% and the (B) / (C) weight ratio is lower than 0.4. In further embodiments of the third type of second heterophasic copolymer has a MFR in the range of from 0.35 and 35 g / 10 in.

[0062] A fourth type of second heterophasic copolymer comprises:(A) from about 5 to 35% by w eight of a propylene and ethylene copolymer having 15% by weight or less of a fraction soluble in xy lene at 25°C (XSA) referred to the weight of A, and having from about 0.5 wt% to 7.0 wt% of ethylene derived units;(B) from about 20 to 50% by w eight of an ethylene homopolymer having 5% by weight or less of a fraction soluble in xylene at 25°C (XSB) referred to the weight of (B); and(C) from about 30 to 60% by weight of a terpolymer, wherein the terpolymer contains propylene, about 45% to 65% by weight of ethylene derived components, and from about 15% to 38% by weight of 1 -butene derived components, wherein the terpolymer has from about 30% to 85% by weight of a fraction soluble in xylene at 25°C (XSc), the amount of ethylene units; 1 -butene units and the fraction XSc being referred to the weight of (C),The total weight of (A) + (B) + (C) is 100 wt%. In further embodiments of the fourth type of second heterophasic copolymer has MFR in the range of from 0.8 and 20 g / 10 min.

[0063] A fifth type of second heterophasic copolymer comprises:(A) from about 5 to 35% by weight of a propylene homopolymer containing 10% by weight or less of a fraction soluble in xylene at 25°C (XSA), the amount of the fraction XSA being referred to the weight of (A);(B) from about 20 to 50% by weight of an ethylene homopolymer having 5% by weight or less of a fraction soluble in xylene at 25°C (XSB) referred to the weight of (B); and(C) from about 30 to 60% by weight of a terpolymer, wherein the terpolymer contains propylene, about 45% to 65% by weight of ethylene derived components, and from about 15% to 38% by weight of 1 -butene derived components, wherein the terpolymer has from about 30% to 85% by weight of a fraction soluble in xylene at 25°C (XSc), the amount of ethylene units; 1 -butene units and the fraction XSc being referred to the weight of (C).

[0064] The total weight of (A) + (B) + (C) is 100 wt%. In further embodiments of the fifth type of second heterophasic copolymer has a MFR in the range of from 0.8 to 20 g / 10 min.Other modifier components

[0065] In some embodiments, the modifier further comprises styrene-butadiene-styrene polymer (“SBS”), amorphous polyolefin (“APO”; such as Vestoplast™, available from Evonik Industries AG, Rellinghauser StraBe 1-11, 45128 Essen, Germany), atactic PP copolymer, atactic PP homopolymer, isotactic PP, or a combination thereof in an amount up to 50 wt. %, based on the weight of the modifier.

[0066] SBS is widely used in the modification of bitumen for roofing membranes due to its unique properties. SBS polymer provides excellent elasticity, allowing the modified bitumen to stretch and recover its shape to accommodate thermal expansion and contraction. SBS-modified bitumen also remains flexible at low temperatures, reducing the risk of cracking and ensuring the membrane performs well in cold climates. The addition of SBS enhances the overall durability of the bitumen, making it more resistant to wear and tear, weathering, and aging. SBS improves the adhesive properties of bitumen, ensuring better bonding to substrates and at seams between sheets, which is critical for waterproofing performance. SBS-modified bitumen has improved resistance to UV radiation, helping to prevent degradation and extend the life of the roofing membrane. SBS polymer enhances the thermal stability of bitumen, allowing it to withstand high temperatures without softening excessively. SBS-modified bitumen exhibits better resistance to various chemicals, which can be beneficial in environments exposed to industrial pollutants or harshconditions. In summary. SBS polymer significantly improves the performance characteristics of bitumen, making it an ideal choice for modified bitumen roofing membranes that require flexibility, durability7, and long-term reliability'.

[0067] APO is highly compatible with a wide range of bitumen types, enhancing the ease of formulation and improving the final product's properties. It provides excellent flexibility and elasticity to the modified bitumen, similar to SBS, but often with enhanced performance at both low and high temperatures. APO-modified bitumen exhibits improved durability, offering greater resistance to weathering, aging, and mechanical stress and maintains flexibility and does not become brittle at low temperatures, making it suitable for cold climates. It also enhances the high- temperature performance, reducing the risk of softening and flow in hot conditions and improves the UV resistance of bitumen, helping to protect the membrane from degradation due to solar radiation. APO-modified bitumen also shows improved resistance to chemicals, which can be beneficial in industrial or polluted environments. APO can improve the processing characteristics of bitumen, making it easier to handle during manufacturing and application. Finally, it enhances the adhesive properties of bitumen, ensuring better bonding to substrates and improved seam integrity, which is crucial for waterproofing. Overall, Vestoplast is an effective polymer modifier for bitumen, offering enhanced performance characteristics that make it suitable for high-quality' roofing membranes and other applications requiring robust, flexible, and durable materials.

[0068] Atactic polypropylene (APP) copolymer is another type of polymer used to modify bitumen in roofing membranes and other construction applications. APP-modified bitumen offers a different set of properties compared to SBS-modified bitumen, making it suitable for specific applications. APP-modified bitumen has excellent high-temperature resistance. It does not soften or flow easily in hot conditions, making it ideal for use in regions with high ambient temperatures. APP enhances the UV resistance of bitumen, helping to protect the roofing membrane from degradation due to prolonged exposure to sunlight. Bitumen modified with APP shows good resistance to a variety of chemicals, which is beneficial in environments exposed to industrial pollutants or harsh chemicals. APP-modified bitumen can be applied using torch-applied techniques due to its thermoplastic nature, allowing for easy and effective installation. APP provides excellent dimensional stability, meaning the modified bitumen maintains its shape and size under varying temperature conditions. APP-modified bitumen is durable and resistant to weathering, ensuring long-term performance and protection for roofing systems. While APP does enhance low-temperature performance, it may not be as effective as SBS in extremely cold conditions. It is more suited to environments where high-temperature resistance is crucial. APP- modified bitumen is generally less flexible than SBS-modified bitumen, but it still offers sufficient flexibility for many roofing applications. APP enhances the w aterproofing properties of bitumen,providing a reliable barrier against water ingress. In summary, APP copolymer is an excellent choice for modifying bitumen in applications where high-temperature resistance, UV stability, and chemical resistance are critical. It is particularly well-suited for roofing membranes in hot climates and for applications.

[0069] Atactic polypropylene (APP) homopolymer is a variant of polypropylene that is used to modify bitumen for roofing membranes and other applications. Similar to APP copolymers, APP homopolymers offer specific advantages that enhance the properties of bitumen. APP homopolymer significantly improves the high-temperature resistance of bitumen, preventing it from softening and flowing under hot conditions. This makes it ideal for use in areas with high ambient temperatures. The inclusion of APP enhances the bitumen's resistance to ultraviolet (UV) radiation, reducing the rate of degradation and extending the lifespan of the roofing membrane. APP-modified bitumen exhibits good resistance to various chemicals, making it suitable for industrial environments or areas exposed to pollutants. APP homopolymer-modified bitumen can be easily applied using torch-applied techniques due to its thermoplastic properties. This allows for efficient and effective installation. APP provides excellent dimensional stability to the bitumen, meaning it maintains its shape and size despite temperature fluctuations. Roofing membranes modified with APP homopolymer are durable and resistant to weathering, ensuring long-term performance. APP enhances the waterproofing capabilities of bitumen, providing a reliable barrier against water ingress and protecting the underlying structure. While APP homopolymer improves the flexibility’ of bitumen compared to unmodified bitumen, it may not offer the same level of low-temperature flexibility7as SBS-modified bitumen. However, it still provides sufficient flexibility for many roofing applications. APP homopolymer is often considered cost-effective, providing a good balance between performance and cost, making it an attractive option for various construction projects. In summary, APP homopolymer is a valuable modifier for bitumen, particularly in applications requiring high-temperature resistance, UV stability7, and chemical resistance. It is well-suited for roofing membranes in hot climates and for projects where torch-applied installation methods are preferred.

[0070] Isotactic polypropylene (iPP) is a type of polypropylene characterized by the regular arrangement of methyl groups on the same side of the polymer chain. This regular structure gives isotactic polypropylene distinct properties that make it useful in various applications, including bitumen modification for roofing membranes. Isotactic polypropylene has a high degree of crystallinity due to its regular structure, which imparts high tensile strength, rigidity, and toughness. iPP exhibits excellent thermal resistance, maintaining its mechanical properties at elevated temperatures. This makes it suitable for applications exposed to high heat. Isotactic polypropylene has good resistance to a wide range of chemicals, including acids, alkalis, andorganic solvents, enhancing the durability of materials modified with iPP. iPP has very low moisture absorption, contributing to the waterproofing performance of bitumen modified with this polymer. When stabilized with appropriate additives, isotactic polypropylene can offer good resistance to UV radiation, helping to protect roofing membranes from degradation caused by sunlight exposure. iPP provides high impact strength and flexibility, which are essential for roofing membranes to withstand mechanical stresses and environmental conditions. The high crystallinity of isotactic polypropylene ensures excellent dimensional stability, meaning that materials modified with iPP maintain their shape and size under various temperature conditions. Isotactic polypropylene can be easily processed using conventional methods such as extrusion and molding, making it convenient to incorporate into bitumen formulations. In summary, isotactic polypropylene is a valuable polymer for modifying bitumen in roofing membranes due to its high strength, thermal resistance, chemical resistance, and dimensional stability. These properties help improve the performance and longevity of roofing systems, making them more resilient to environmental stresses and extending their service life.Polyolefin recyclate

[0071] In some embodiments, the polyolefin recyclate is a polypropylene. In some embodiments, the polypropylene comprises units derived from propylene and units derived from one or more of ethylene and C4-C20 alpha-olefins or mixtures thereof. In some embodiments, the polypropylene comprises a polypropylene impact copolymer, a polypropylene random copolymer, or a combination thereof. In some embodiments, the polypropylene recyclate has a melt flow rate less than or equal to 125 dg / min. but more typically less than or equal to 35 dg / min and preferably less than or equal to 2.0 dg / min. (2.16 kg, 230°C).

[0072] Polypropylene recyclate comprises a PCR resin containing recyclates derived from propylene homopolymers and copolymers, including plastomers, having of units derived from propylene and units derived one or more of ethylene and C4-C20 alpha-olefins or mixtures thereof. Preferably, the units derived from one or more of ethylene and C4-C10 alpha-olefin comonomers are present in amounts up to 35 wt%, based upon the total weight of the copolymer of propylene. The propylene homopolymers and copolymers can be produced using either Ziegler Natta or single-site catalysts, e.g., metallocene catalysts. The propylene homopolymers and copolymers can be produced using a gas phase process, liquid process (condensed monomer), slurry process, or solution process or combination thereof. In some embodiments, when the propylene polymer is a copolymer, it preferably contains 0.4 to 18% copolymer, more typically 2 to 6 wt. %, based upon the total weight of the copolymer, of ethylene derived units as a comonomer.

[0073] In some embodiments, a polypropylene recyclate to be modified by the process herein comprises a polypropylene homopolymer, a random copolymer polypropylene, an impactcopolymer polypropylene, or a combination thereof. In some embodiments, propylene homopolymers have an isotactic index of at least 90. In some embodiments random copolymer polypropylene comprise random copolymers of propylene and ethylene or butylene, or random terpolymers of propylene, ethylene, butylene and hexene, wherein the maximum ethylene content, or ethylene plus alpha-olefin content, is 10% by weight, and the random copolymer polypropylene has an isotactic index of at least 80. In some embodiments, the impact copolymer polypropylene comprises a heterophasic propylene polymer materials consisting essentially of by weight, (i) 99-55% of a polymeric material selected from the group consisting of a propylene homopolymer having an isotactic index greater than 90, and a crystalline copolymer of propylene and an alpha-olefin of the formula CH2=CHR, where R is H or a 2-6 carbon linear or branched alkyl group, having an isotactic index of at least 80, the alpha-olefin being less than 10% of the copolymer, and (ii) 1-45% of an elastomeric olefin polymer of propylene and an olefinic material selected from the group consisting of alpha-olefins of the formula CH2=CHR. where R is H or a 2-6 carbon linear or branched alkyl group, the alpha-olefin being 50-70% of the elastomeric polymer.

[0074] In some embodiments, the polyolefin recyclate is a polyethylene recyclate. In some embodiments, the polyethylene recyclate comprises units derived from ethylene and units derived from one or more of C3-C20 alpha-olefins or mixtures thereof. In some embodiments, the polyethylene recyclate comprises a high density polyethylene, a medium density polyethylene, a low density' polyethylene, a linear low density polyethylene, or a combination thereof. In some embodiments, the polyethylene recyclate has a melt index less than or equal to 160 dg / min. but more typically less than or equal to 20 dg / min. and preferably less than or equal to 2.0 dg / min. (2.16 kg, 190°C).

[0075] In some embodiments, a polyethylene recyclate to be modified by the process herein comprises a PCR resin containing recy elates derived from a low density polyethylene (LDPE), a high density' polyethylene (HDPE), a copolymer of ethylene with a C3-10 alpha-olefin, (generally referred to as linear low density polyethylene (LLDPE)), of commerce are normally solid, somewhat flexible, thermoplastic polymers formed by the polymerization of the particular monomer(s) by various methods well known in the art. For example, such polymers can be prepared by free-radical polymerization at high pressures, or by low pressure processes, such as fluidized-bed, gas phase technology’, with molybdenum-based catalysts, with chromium-based catalysts, with vanadium-based catalysts, with Ziegler-Natta catalysts systems, or with metallocene catalyst systems. The high pressure processes produce polymers with long chain branching and the low pressure processes produce essentially linear polymers with controlled levels of short chain branching. In Ziegler-Natta catalyst systems, the catalyst is formed by aninorganic compound of a metal of Groups I-I1I of the Periodic Table, (for example, an aluminum alkyl), and a compound of a transition metal of Groups IV-VIII of the Periodic Table, (for example, a titanium halide). A typical crystallinity is about 21 to about 75 wt. % by the method of Wunderlick & Guar, J. Phys. Chem. Ref. Data, Vol 10, No. 1 (1981). Also, the typical melt index of said ethylene homopolymers or copolymers is from 0.2 and 50 g / 10 minutes (measured according to ASTM 1238, Condition E).

[0076] Suitable polyethylenes for a polyolefin recyclate include ethylene homopolymers and copolymers of units derived from ethylene and units derived from one or more of C3-C20 alphaolefins or mixtures thereof. In some embodiments, the units derived from the one or more C3-C8 alpha-olefin comonomers are present in amounts up to 15 wt. %, based upon the total weight of the copolymer of ethylene. The ethylene homopolymers and copolymers can be produced using either Ziegler Natta catalyst, chromium-based catalyst, vanadium-based catalyst or single-site catalyst, e.g., metallocene catalyst. The ethylene homopolymers and copolymers can be produced using a gas phase process, high pressure process, slurry process, or solution process. Ethylene homopolymers and ethylene-Cs-Cs alpha-olefin copolymers include very low density polyethylene (VLDPE), low density polyethylene (LDPE), linear low density' polyethylene (LLDPE), medium density polyethylene (MDPE) and high density polyethylene (HDPE). VLDPE is defined as having a density of 0.860 to 0.910 g / cm3, as measured by ASTM D-1505 “Column Method / ' LDPE and LLDPE are defined as having densities in the range of from 0.910 to 0.930 g / cm3. MDPE is defined as having a density of 0.930 to 0.945 g / cm3. HDPE is defined as having a density of at least 0.945 g / cm3, preferably from 0.945 to 0.969 g / cm'. The ethylene homopolymers and copolymers preferably have melt indexes (Mis), as measured by ASTM D 1238, condition 190°C / 2.16 kg. from 0.01 to 400 dg / min.. preferably, from 0.1 to 200 dg / min., more preferably from 1 to 100 dg / min.

[0077] In some embodiments, LDPE homopolymers can be produced in a high pressure, free- radical polymerization process, such as in one or more tubular reactors, one or more autoclave reactors, or a combination thereof. Operating conditions for the high-pressure process can include, but are not limited to, a pressure in the range of from 70 MPa to 700 MPa and a temperature in the range of from 150°C to 500°C. Such homopolymers have a high degree of long-chain branching and a density in the range of from 0.910 g / cm3to 0.940 g / cm3.

[0078] In some embodiments, LDPE copolymers of ethylene and C3-C12 alpha-olefins can be produced in a high pressure, free-radical polymerization process, such as in one or more tubular reactors, one or more autoclave reactors, or a combination thereof. Such C3-C12 alpha-olefins include, but are not limited to, substituted or unsubstituted C3 to C12 alpha olefins such as propylene, butene, pentene, hexene, heptene, octene, nonene, decene, undecene, dodecane, andisomers thereof. When present, comonomers can be present in amounts up to 15 wt%, 10 wt%. or 5 wt%. Operating conditions for the high-pressure process can include, but are not limited to, a pressure in the range of from 70 MPa to 700 MPa and a temperature in the range of from 150°C to 500°C. Such homopolymers have a high degree of long-chain branching and a density in the range of from 0.910 g / cm3to 0.940 g / cm3.

[0079] LDPE as described above, can be characterized by having: i) a density in the range of from 0.910 g / cnr’ to 0.940 g / cm3or from 0.915 g / cm3to 0.935 g / cm3; ii) a melt index (2.16 kg, 190°C) less than or equal to 70 g / 10 min., less than or equal to 2.0 g / 10 min., less than or equal to 0.5 g / 10 min., less than or equal to 0.2 g / 10 min., or less than or equal to 0.1 g / 10 min.; hi) a molecular weight distribution (Mw / Mn) greater than 4.0, greater than 8.0, or greater than 15, and / or less than 35, less than 30, or less than 25; iv) a weight average molecular weight (Mw) greater than or equal to 100,000 daltons, greater than or equal to 150,000 daltons, greater than or equal to 200,000 daltons, or greater than or equal to 250,000 daltons, and / or less than or equal to 600,000 daltons, less than or equal to 500,000 daltons, less than or equal to 400,000 daltons, or less than or equal to 300,000 daltons; and v) a melt elasticity ('‘ER”) greater than or equal to 1 .0, greater than or equal to 1.4, or greater than or equal to 2.0.

[0080] It should be noted that the polyolefins described above, both polyethylene and polypropylene, are the virgin polymers that entered the stream of commerce. The polyolefin recy elates herein are what is recovered after use and disposal by the consumer or post-industrial use. Such consumer waste plastic is collected, sorted, and processed to produce various grades of polyolefin recy elates. The original properties are lost by such reprocessing of a mixture of multiple polymers and typically have higher molecular weight than is desirable for reuse in many applications. The polyolefin recyclates also contain contaminants such as volatile organic compounds, which make the polyolefin recyclates unsuitable for reuse in many applications.Fillers

[0081] The bitumen blend composition of claim 1, wherein the filler component comprises a mineral filler, a fibrous filler, a fire-retardant filler, an organic filler, a reflective filler, or a combination thereof.

[0082] In some embodiments, mineral fillers include but are not limited to materials such as limestone, talc, slate dust, and silica. Mineral fillers are added to improve the stiffness and the thermal stability of the bitumen and also contribute to the overall weight and dimensional stability of the membrane.

[0083] In some embodiments, fibrous fillers include but are not limited to fibrous materials like fiberglass or polyester fibers. Fiber fillers are used to increase the tensile strength and punctureresistance of the membrane. These fibers help distribute stresses throughout the material, reducing the likelihood of tears and leaks.

[0084] In some embodiments, fire retardant fillers include but are not limited to aluminum hydroxide or antimony trioxide. Fire retardant fillers are added to improve the fire resistance of the membrane. These compounds help in slowing down the combustion process, providing additional safety in fire-prone environments.

[0085] These fillers are crucial in determining the physical and chemical properties of the final waterproofing membrane, enabling it to meet specific performance criteria required for different roofing applications.Reinforcement layer

[0086] In some embodiments, a polymer modified bituminous waterproofing membrane comprises a moisture boundary' layer and a reinforcement layer. The reinforcement layer provides additional mechanical strength, dimensional stability, and resistance to tearing. The materials used for this support layer are selected based on their ability to endure physical stresses and / or environmental factors. In some embodiments, the reinforcement layer comprises a polyester mat, a fiberglass mat, a nonwoven fabric, or a combination thereof. Here are the primary materials used as structural support layers in bituminous waterproofing membranes.

[0087] In some embodiments, a polyester mat comprises polyethylene terephthalate (“PET”). Polyester reinforcement layers typically range from about 120 to 250 grams per square meter (g / m2) in weight, w hich translates to a thickness of about 0.3 to 0.8 mm, depending on the density and manufacturing specifications. In addition to excellent tensile strength, durability, and resistance to punctures and tears, polyester mats can absorb a bit of the bitumen, creating a strong bond with the moisture boundary layer.

[0088] In some embodiments, a fiberglass reinforcement layer are typically around 50 to 120 g / m2, which translates to a thickness of approximately 0.2 to 0.5 millimeters. Fiberglass layers are generally thinner and lighter than comparable polyester layers. Fiberglass mats provide high tensile strength and do not stretch or shrink significantly, which helps the membrane maintain its shape and size under temperature changes and other environmental conditions. Fiberglass is also highly resistant to rot and decay.

[0089] Non-w oven fabrics can be made from various synthetic fibers and are used in some bituminous membranes to provide a balance of flexibility, tear resistance, and cost-effectiveness. In some embodiments, non-woven fabrics are saturated with bitumen to enhance their waterproofing capability and mechanical bonding with the moisture boundary layer.

[0090] In some embodiments, Fiberglass: Fiberglass mats provide high tensile strength and dimensional stability. They do not stretch or shrink significantly, which helps the membranemaintain its shape and size under temperature changes and other environmental conditions. Fiberglass is also highly resistant to rot and decay.Membrane performance

[0091] In some embodiments, formulation of the composition of the moisture boundary layer and / or selection of the material of the reinforcement layer are based on temperature and / or other environmental conditions where a polymer modified bituminous waterproofing membrane will be installed. Nonlimiting performance parameters to be considered include but are not limited to penetration (ASTM D5), cold flexibility (EN1109), ring and ball softening point (ASTM D36), thermal aging (ASTM D2872 or a modified version thereof), or a combination thereof.

[0092] Measuring the consistency of bituminous materials using ASTM D5 provides information that can be used to manage and mitigate the risk of damage to a polymer modified bituminous waterproofing layer during and after installation (e.g., penetration of footprints into moisture boundary layer. ASTM D5 test results can aid in selection of selection of formulation of the moisture boundary layer and / or optimal installation conditions (e.g., hot or cold weather).

[0093] EN 1109 is a European standard that specifies the requirements and test methods for determining the flexibility at low temperatures of polymer-modified bituminous sheets used in waterproofing applications. EN 1109 test results can aid in selection of selection of formulation of the moisture boundary layer and / or optimal installation conditions (e.g., hot or cold weather).

[0094] ASTM D36 is used for determining the temperature at which bitumen and asphaltic materials transition from a semi-solid to a liquid state. The softening point is a key parameter in characterizing the thermal properties of asphalt binders and bitumen, indicating the material's ability to withstand various service temperatures.

[0095] After short-term aging using ASTM D2872, the polymer modified bitumen composition undergoes further aging according to ASTM D6521 using a pressure aging vessel (PAV) to simulate extended exposure to oxidative conditions over several years. Such aged samples are then evaluated according to ASTM D6648 using bending beam rheometer (BBR) testing to determine long-term flexibility and resistance to cracking at low temperatures.Certain Embodiments

[0096] Disclosed are bitumen blends with polymers useful in waterproofing membranes for use in roofing applications. In a first set of embodiments, such bitumen blend compositions comprise: a bitumen component in an amount in the range of from 60 wt. % to 99 wt. %, from 70 wt. % to 95 wt. %, from 75 wt. % to 90 wt. %, or from 80 wt. % to 85 wt. %; a modifier in an amount in the range of from 1 wt. % to 40 wt. %, from 5 wt. % to 30 wt. %, from 10 wt. % to 25 wt. %, or from 15 wt. % to 20 wt. %; anda filler component in an amount in the range of from 0 wt. % to 45 wt. %, from 10 wt. % to 40 wt. %, from 15 wt. % to 35 wt. %, or from 20 wt. % to 30 wt. %.The modifier comprises a thermoplastic polyolefin component and a polyolefin recyclate component. In some embodiments, the modifier has a viscosity at 190°C in the range of from 1.000 cP to 10.000 cP. from 1,500 cP to 9,000 cP, or from 2,000 cP to 8,000 cP. The wt. % of each component is based on the total combined weight of the bitumen component, the modifier, and the filler. The bitumen is present in the bitumen blend composition as a dispersed phase in a matrix phase of the modifier.

[0097] In a second set of embodiments, in addition to the limitations of each embodiment in the first set of embodiments, the bitumen blend composition is further characterized by the modifier comprising: the thermoplastic polyolefin component in an amount in the range of from 1 wt. % to 99 wt. %, from 10 wt. % to 90 wt. %, from 25 wt. % to 75 wt. %, or from 40 wt. % to 60 wt. %; and the polyolefin recyclate component in an amount in the range of from 1 wt. % to 99 wt. %, from 10 wt. % to 90 wt. %, from 25 wt. % to 75 wt. %, or from 40 wt. % to 60 wt. %; wherein wt. % is based on the total weight of the thermoplastic polyolefin component and the polyolefin recyclate component.

[0098] In a third set of embodiments, in addition to the limitations of each embodiment in the first set of embodiments and the second set of embodiments, the bitumen blend composition is further characterized by the thermoplastic polyolefin component comprising: a first heterophasic copolymer, wherein a propylene homopolymer or a random copolymer (RACO) with ethylene is mixed with a bipolymer;. a second heterophasic copolymer containing three components: A) a semi-crystalline propylene homopolymer, or random copolymer with ethylene or other alpha-olefins; B) a polyethylene homopolymer, or a polyethylene copolymer with 1 -butene or other alpha-olefins; and. C) an elastomeric component consisting of a copolymer of propylene, ethylene, and optionally 1 -butene; or a combination thereof.

[0099] In a fourth set of embodiments, in addition to the limitations of each embodiment in the third set of embodiments, the bitumen blend composition is further characterized by the first heterophasic copolymer comprising:(A) from about 8 to about 25% by weight of a crystalline polymer fraction selected from the group consisting of (i) a propylene homopolymer having solubility in xylene at room temperature low er than 10% by weight; and (ii) a copolymer of propylene and atleast one alpha-olefin of formula H2C=CHR, where R is H or a C2-C6 linear or branched alkyl, containing at least 85% by weight of propylene, having solubility in xylene at room temperature lower than 15% by weight; and(B) from about 75 to about 92% by weight of an elastomeric fraction comprising(i) a first elastomeric copolymer of propylene with at least one alpha-olefin of formula H2C=CHR, where R is H or a C2-C6 linear or branched alkyl, optionally containing 0.5 to 5% by weight of a diene, the first elastomeric copolymer containing from about 15 to 32% by weight alpha-olefin, and having solubility in xylene at room temperature greater than 50% by weight, the intrinsic viscosity of the xylene soluble fraction ranging from about 3.0 to 5.0 dl / g; and(ii) a second elastomeric copolymer of propylene with at least one alpha-olefin of formula H2C=CHR, where R is H or a C2-C6 linear or branched alkyl, optionally containing 0.5 to 5% by weight of a diene, the second elastomeric copolymer containing more than 32% up to 45% by weight alpha-olefin, and having solubility in xylene at room temperature greater than 80% by weight, the intrinsic viscosity of the xylene soluble fraction ranging from about 4.0 to 6.5 dl / g; wherein the (b.i) / (b.ii) weight ratio ranges from about 1:5 to 5: 1.

[0100] The total weight of (A) + (B) is 100 wt%. In further embodiments of the fourth set of embodiments, the first heterophasic copolymer has: a flexural modulus lower than 60 MPa; a Shore A hardness lower than 90; a tension set at 100% lower than 35%; a melt flow rate between 0. 1 and 10 g / 10 min., wherein the melt flow rate values are measured according to ASTM D 1238; or any combination thereof.

[0101] In a fifth set of embodiments, in addition to the limitations of each embodiment in the third set of embodiments, the bitumen blend composition is further characterized by the first heterophasic copolymer comprising:(A) from about 10 to 70% by weight of a copolymer of propylene and one or more co- monomer(s) selected from ethylene and CH2=CHR alpha-olefins where R is a 2-8 carbon alkyl, wherein the copolymer contains from about 0 to 8% of co-monomer(s); and(B) from about 30 to 90% by weight of a copolymer of ethylene and (i) propylene or (ii) CH2=CHR alpha-olefins, where R is a 2-8 carbon alkyl radical, or (iii) a combination thereof, optionally with minor amounts of a diene, with this copolymer containing from about 50% to 80% of ethylene.

[0102] The total weight of (A) + (B) is 100 wt%. In further embodiments of the fifth set of embodiments, the first heterophasic copolymer has an intrinsic viscosity [r|] of a fraction soluble in xylene at room temperature (XS) of 1.8 dl / g or more.

[0103] In a sixth set of embodiments, in addition to the limitations of each embodiment in the third set of embodiments, the bitumen blend composition is further characterized by the second heterophasic copolymer comprising:(A) from about 5 to 35% by weight of a propylene-based polymer containing 90% by weight or more of propylene units and 10% by weight or less of a fraction soluble in xylene at 2 °C;(B) from about 25 to 50% by weight of an ethylene homopolymer containing 5% by weight or less of a fraction soluble in xylene at 25°C; and(C) from about 30 to 60% by weight of a copolymer of ethylene and propylene containing from about 25% to 75% by weight of ethylene units and containing from about 55% to 95% by weight of a fraction soluble in xylene at 25°C.

[0104] The total weight of (A) + (B) + (C) is 100 wt%. In further embodiments of the sixth set of embodiments, the second heterophasic copolymer has: a total content the ethylene units (as determined by infrared analysis) of 50% by weight or higher; a melt flow rate between 1.0 and 5.0 g / 10 min.; or a combination thereof.

[0105] In a seventh set of embodiments, in addition to the limitations of each embodiment in the third set of embodiments, the bitumen blend composition is further characterized by the second heterophasic copolymer comprising:(A) from about 5 to 35% by weight of a propylene-based polymer containing 90% by weight or more of propylene units and 10% by weight or less of a fraction soluble in xylene at 25 °C;(B) from about 25 to 50% by weight of a copolymer of ethylene and a Cs-Cs alpha-olefin containing from about 0.1% to 20% by weight of alpha-olefin units and 75% by weight or less of a fraction soluble in xylene at 25°C; and(C) from about 30 to 60% by weight of a copolymer of ethylene and propylene containing from about 25% to 75% by weight of ethylene units and containing from about 55% to 95% by weight, of a fraction soluble in xylene at 25°C.

[0106] The total weight of (A) + (B) + (C) is 100 wt%. In further embodiments of the seventh set of embodiments, the second heterophasic copolymer has: a total content of the CT-Cs alphaolefin units (as determined by infrared analysis) of 3% by weight or higher; a melt flow rate between 0.1 and 6 g / 10 min.; or a combination thereof.

[0107] In a eighth set of embodiments, in addition to the limitations of each embodiment in the third set of embodiments, the bitumen blend composition is further characterized by the first heterophasic copolymer comprising:(A) from 30% to less than 70% of a semi-crystalline polypropylene component selected from the group consisting of a propylene homopolymer, a random copolymer of propylene containing up to 8% of ethylene, a random copolymer of propylene containing up to 8% of at least one C4-C10 a-olefin, or any combination thereof, wherein the semi-crystalline polypropylene component has a monomodal molecular weight distribution; and(B) greater than 30% to about 70% of a bipolymer component of propylene and at least one co-monomer selected from ethylene and / or C4-C10 a-olefins, wherein the bipolymer itself has from about 50% to about 75% of propylene, wherein the bipolymer is partially soluble in xylene at room temperature and has an intrinsic viscosity of from about 4 to 7.5 dl / g (in decalin).

[0108] The total weight of (A) + (B) is 100 wt%. In further embodiments of the eighth set of embodiments, the first heterophasic copolymer has: a MFR between 0.35 and 1 g / 10 min.; an intrinsic viscosity of the xylene soluble fraction from about 4 dL / g to 6 dL / g (in decalin); or a combination thereof.

[0109] In a ninth set of embodiments, in addition to the limitations of each embodiment in the third set of embodiments, the bitumen blend composition is further characterized by the second heterophasic copolymer comprising:(A) from about 10 to 60% by weight of a homopolymer of propylene with isotactic index greater than 80, or a copolymer having over 85% by weight of propylene with (i) ethylene or (ii) CH2=CHR alpha-olefins, where R is a 2-8 carbon alky l radical, or combinations of (i) and (ii);(B) from about 5 to 20% parts by weight of a copolymer fraction containing ethylene that is insoluble in xylene at ambient temperature; and(C) from about 37 to 80% by weight of a copolymer fraction of ethylene and (i) propylene or (ii) another CH2=CHR a-olefin, or combinations of (i) and (ii), and, optionally, minor portions of a diene, wherein component (C) is less than 40% by weight of ethylene, being soluble in xylene at ambient temperature, and having an intrinsic viscosity from about 1.5 to 5 dl / g;

[0110] The total weight of (A) + (B) + (C) is 100 wt%, and the percent by weight of the sum of the (B) and (C) components with respect to the total polyolefin composition is from about 40% to 90% and the (B) / (C) weight ratio is lower than 0.4. In further embodiments of the ninth set ofembodiments, the second heterophasic copolymer has a MFR in the range of from 0.35 and 35 g / 10 in.[OHl] In a tenth set of embodiments, in addition to the limitations of each embodiment in the third set of embodiments, the bitumen blend composition is further characterized by the second heterophasic copolymer comprising:(A) from about 5 to 35% by weight of a propylene and ethylene copolymer having 15% by weight or less of a fraction soluble in xylene at 25°C (XSA) referred to the weight of A, and having from about 0.5 wt% to 7.0 wt% of ethylene derived units;(B) from about 20 to 50% by weight of an ethylene homopolymer having 5% by weight or less of a fraction soluble in xylene at 25°C (XSB) referred to the weight of (B); and(C) from about 30 to 60% by weight of a terpolymer, wherein the terpolymer contains propylene, about 45% to 65% by weight of ethylene derived components, and from about 15% to 38% by weight of 1-butene derived components, wherein the terpolymer has from about 30% to 85% by weight of a fraction soluble in xylene at 25°C (XSc), the amount of ethylene units; 1 -butene units and the fraction XSc being referred to the weight of (C),The total weight of (A) + (B) + (C) is 100 wt%. In further embodiments of the tenth set of embodiments, the second heterophasic copolymer has MFR in the range of from 0.8 and 20 g / 10 min.

[0112] In a eleventh set of embodiments, in addition to the limitations of each embodiment in the third set of embodiments, the bitumen blend composition is further characterized by the second heterophasic copolymer comprising:(A) from about 5 to 35% by weight of a propylene homopolymer containing 10% by weight or less of a fraction soluble in xylene at 25°C (XSA), the amount of the fraction XSA being referred to the weight of (A);(B) from about 20 to 50% by weight of an ethylene homopolymer having 5% by weight or less of a fraction soluble in xylene at 25°C (XSB) referred to the weight of (B); and(C) from about 30 to 60% by weight of a terpolymer, wherein the terpolymer contains propylene, about 45% to 65% by weight of ethylene derived components, and from about 15% to 38% by weight of 1-butene derived components, wherein the terpolymer has from about 30% to 85% by weight of a fraction soluble in xylene at 25°C (XSc), the amount of ethylene units; 1-butene units and the fraction XSc being referred to the weight of (C).

[0113] The total weight of (A) + (B) + (C) is 100 wt%. In further embodiments of the eleventh set of embodiments, the second heterophasic copolymer has a MFR in the range of from 0.8 to 20 g / 10 min.

[0114] In a twelfth set of embodiments, in addition to the limitations of each embodiment in the third set of embodiments, the bitumen blend composition is further characterized by the first heterophasic copolymer comprising:(A) from about 60 to 85% by weight of a broad molecular weight distribution propylene polymer having a poly dispersity index from about 5 to 15 and melt flow rate of from about 40 to 75 g / 10 min.; and(B) from about 15 to 40% by weight of a partially xylene-soluble olefin polymer rubber consisting of a poly(ethylene-co-propylene) containing at least 65% by weight of ethylene, wherein the xylene-insoluble content of (B) is 25- 40% by weight, measured by dissolving the polymer in xylene at 135°C, cooling the solution to 25°C, allowing to settle for 30 minutes, followed by filtering;

[0115] The total weight of (A) + (B) is 100 wt%. In further embodiments of the twelfth set of embodiments, the first heterophasic copolymer has a MFR in the range of from 5 to 20 g / 10 min.

[0116] In a thirteenth set of embodiments, in addition to the limitations of each embodiment in the third set of embodiments, the bitumen blend composition is further characterized by the first heterophasic copolymer comprising:(A) from about 25 to 50% by weight of a crystalline propylene homopolymer with a solubility in xylene at room temperature of less than or equal to 4%, or a crystalline copolymer of propylene with ethylene or a CT-Cs alpha-olefin having an ethylene or alpha-olefin content 0.5 to 3%. and a solubi lity in xylene at room temperature of from less than or equal to 4%; and(B) from about 50 to 75% by weight of a partially amorphous copolymer of ethylene with a C4-C8 alpha-olefin, wherein the alpha-olefin content is from about 10 to 20%, and the copolymer is from about 10 to 40% soluble in xylene at room temperature.

[0117] The total weight of (A) + (B) is 100 wt.

[0118] In a fourteenth set of embodiments, in addition to the limitations of each embodiment in the first through thirteenth sets of embodiments, the bitumen blend composition is further characterized by the first polyolefin recyclate comprising a polyethylene, a polypropylene, or a combination thereof.

[0119] In a fifteenth set of embodiments, in addition to the limitations of each embodiment in the fourteenth set of embodiments, the bitumen blend composition is further characterized by the polyethylene comprising a high-density polyethylene (HDPE), a medium density polyethylene(MDPE). a low-density polyethylene (LDPE), a linear low-density polyethylene (LLDPE). or a combination thereof.

[0120] In a sixteenth set of embodiments, in addition to the limitations of each embodiment in the fourteenth set of embodiments, the bitumen blend composition is further characterized by the polypropylene comprising: a propylene homopolymer; a random copolymer of propylene and ethylene and / or one or more C4-C20 alpha-olefins, wherein the maximum content of ethylene and / or alpha-olefins is 10% by w eight, and the random copolymer has an isotactic index of at least 80; a heterophasic propylene polymer materials consisting essentially of by w eight,(i) 99-55% of a polymeric material selected from the group consisting of a propylene homopolymer having an isotactic index greater than 90, and a crystalline copolymer of propylene and an alpha-olefm of the formula CH2=CHR. where R is H or a 2-6 carbon linear or branched alkyl group, having an isotactic index of at least 80, the alpha-olefm being less than 10% of the copolymer, and(ii) 1-45% of an elastomeric olefin polymer of propylene and an olefinic material selected from the group consisting of alpha-olefins of the formula CH2=CHR, where R is H or a 2-6 carbon linear or branched alkyl group, the alpha-olefm being 50-70% of the elastomeric polymer; or a combination thereof.

[0121] In a seventeenth set of embodiments, in addition to the limitations of each embodiment in the first through the sixteenth sets of embodiments, the bitumen blend composition is further characterized by the filler component comprises a mineral filler, a fibrous filler, a fire retardant filler, an organic filler, a reflective filler, or a combination thereof.

[0122] In another aspect, a membrane is provided w herein the membrane comprises a moisture boundary layer comprising the bitumen blend composition of any one embodiment of the first through the seventeenth embodiments. In some embodiments, the membrane further comprises a reinforcement layer. In some embodiments, the reinforcement layer comprises fiberglass, polyester, or a combination thereof.EXAMPLES

[0123] The following examples are included to demonstrate preferred embodiments of the invention. It should be appreciated by those of skill in the art that the techniques disclosed in the examples which follow represent techniques discovered by the inventor to function well in the practice of the invention, and thus can be considered to constitute preferred modes for its practice. However, those of skill in the art should, in light of the present disclosure, appreciate that manychanges can be made in the specific embodiments which are disclosed and still obtain a like or similar result without departing from the spirit and scope of the invention.Test Methods

[0124] Viscosities of polymer-modified bitumen mixtures are determined in accordance with ASTM D-4402.

[0125] Densities are determined in accordance with ASTM D-792.

[0126] Melt index (“I2”) was determined by ASTM D-1238-E (190°C / 2.16 kg).

[0127] Melt flow rate (“MFR”) was determined by ASTM D-1238-L (230°C / 2. 16 kg).

[0128] Molecular weight distribution (“MWD”) as well as the molecular weight averages (number-average molecular weight, Mnweight-average molecular weight, Mw, and z-average molecular weight, Mz) are determined using a high temperature Polymer Char gel permeation chromatography (“GPC”), also referred to as size exclusion chromatography (“SEC”), equipped with a filter-based infrared detector, IR5, a four-capillary differential bridge viscometer, and a Wyatt 18-angle light scattering detector. Mn, Mw, Mz,MWD. and short chain branching (SCB) profiles are reported using the IR detector, whereas long chain branch parameter, g’, is determined using the combination of viscometer and IR detector at 145°C. Three Agilent PLgel Olexis GPC columns are used at 145 °C for the polymer fractionation based on the hydrodynamic size in 1,2,4- trichlorobenzene (TCB) with 300 ppm antioxidant butylated hydroxytoluene (BHT) as the mobile phase. 16 mg polymer is weighted in a 10 mL vial and sealed for the GPC measurement. The dissolution process is obtained automatically (in 8 ml TCB) at 160°C for a period of 1 hour with continuous shaking in an Agilent autosampler. 20 pL Heptane was also injected in the vial during the dissolution process as the flow marker. After the dissolution process, 200 pL solution was injected in the GPC column. The GPC columns are calibrated based on twelve monodispersed polystyrene (PS) standards (provided by PSS) ranging from 578 g / mole to 3,510,000 g / mole. The comonomer compositions (or SCB profiles) are reported based on different calibration profiles obtained using a series of relatively narrow polyethylene (polyethylene with 1-hexene and 1- octene comonomer were provided by Polymer Char, and polyethylene with 1 -butene were synthesized internally) with known values of CH3 / IOOO total carbon, determined by an established solution NMR technique. GPC one software was used to analyze the data. The long chain branch parameter, g’, is determined by the equation: g’ = [T|] / [ |] lin where, [q] is the average intrinsic viscosity7of the polymer that is derived by summation of the slices over the GPC profiles as follows:where Ci is the concentration of a particular slice obtained from IR detector, and [r] , is the intrinsic viscosity of the slice measured from the viscometer detector. [r|] iin is obtained from the IR detector using Mark-Houwink equation ( [rj]lin= J KM3113113) for a linear high density polyethylene, where Mi is the viscosity-average molecular weight for a reference linear polyethylene, K and a are Mark-Houwink constants for a linear polymer, which are K=0.000374, a=0.7265 for a linear polyethylene and K=0.00041, a=0.6570 for a linear polypropylene.Materials used in experimentsStarting materials

[0129] Starting materials for Examples 1 and 2 are shown in TABLE 1 below.TABLE 11 Melt flow rate, 2.16 g (a), 230° CModifier blends

[0130] Examples 1 and 2 in Table 2 show the composition of two modifier blends.TABLE 2* All weight percentages based on the combined weight of the polyethylene component and the polyethylene component being 100%.- Modifier properties

[0131] Examples 1 and 2 in Table 3 show properties of two modifier blends.TABLE 3

[0132] For the sake of brevity, only certain ranges are explicitly disclosed herein. However, in addition to recited ranges, any lower limit may be combined with any upper limit to recite a range not explicitly recited, as well as, ranges from any lower limit may be combined with any other lower limit to recite a range not explicitly recited, in the same way, ranges from any upper limit may be combined with any other upper limit to recite a range not explicitly recited. Additionally, within a range includes every' point or individual value between its end points even though not explicitly recited. Thus, every point or individual value may serve as its own lower or upper limit combined with any other point or individual value or any other lower or upper limit, to recite a range not explicitly recited.

[0133] All documents and references cited herein, including testing procedures, publications, patents, journal articles, etc., are herein fully incorporated by reference for all jurisdictions in which such incorporation is permitted and to the extent such disclosure is consistent with the description of the present invention.

[0134] Although the present invention and its advantages have been described in detail, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims. Moreover, the scope of the present application is not intended to be limited to the particular embodiments of the processes, machines, film structures, composition of layers, means, methods, and / or steps described in the specification. As one of the ordinary skill in the art will readily appreciate from the disclosure of the present invention, processes, machines, film structures, composition of layers, means, methods, and / or steps, presently existing or later to be developed that perform substantially the same function or achieve substantially the same result as the corresponding embodiments described herein, may be utilized according to the present invention.Accordingly, the appended claims are intended to include within their scope such processes, machines, film structures, composition of layers, means, methods, and / or steps.

Claims

CLAIMSWhat is claimed is:

1. A bitumen blend composition comprising: a bitumen component in an amount in the range of from 60 wt. % to 99 wt. %; a modifier in an amount in the range of from 1 wt. % to 40 wt. %; and a filler component in an amount in the range of from 0 wt. % to 45 wt. %; wherein the modifier comprises a thermoplastic polyolefin component and a polyolefin recyclate component; and wt. % is based on the total combined weight of the bitumen component, the modifier, and the filler.

2. The bitumen blend composition of claim 1, wherein the bitumen is present in the bitumen blend composition as a dispersed phase in a matrix phase of the modifier.

3. The bitumen blend composition of claim 1, wherein the modifier comprises: the thermoplastic polyolefin component in an amount in the range of from 1 wt. % to 99 wt. %; and the polyolefin recyclate component in an amount in the range of from 1 wt. % to 99 wt. %; wherein wt. % is based on the total weight of the thermoplastic polyolefin component and the polyolefin recyclate component.

4. The bitumen blend composition of claim 1, wherein the modifier has a viscosity' at 190°C in the range of from 1,000 cP to 10,000 cP.

5. The bitumen blend composition of claim 1, wherein the thermoplastic polyolefin component comprises: a first heterophasic copolymer, wherein a propylene homopolymer or a random copolymer (RACO) with ethylene is mixed with a bipolymer;. a second heterophasic copolymer containing three components: A) a semi-crystalline propylene homopolymer, or random copolymer with ethylene or other alpha-olefins; B) a polyethylene homopolymer, or a polyethylene copolymer with 1 -butene or other alpha-olefins; and, C) an elastomeric component consisting of a copolymer of propylene, ethylene, and optionally 1 -butene; ora combination thereof.

6. The bitumen blend composition of claim 5, wherein the first heterophasic copolymer comprises:(A) from about 8 to about 25% by weight of a crystalline polymer fraction selected from the group consisting of (i) a propylene homopolymer having solubility in xylene at room temperature lower than 10% by weight; and (ii) a copolymer of propylene and at least one alpha-olefin of formula H2C — CHR, where R is H or a C2-C6 linear or branched alkyl, containing at least 85% by weight of propylene, having solubility in xylene at room temperature lower than 15% by weight; and(B) from about 75 to about 92% by weight of an elastomeric fraction comprising(i) a first elastomeric copolymer of propylene with at least one alpha-olefin of formula H2C=CHR, where R is H or a C2-C6 linear or branched alkyl, optionally containing 0.5 to 5% by weight of a diene, the first elastomeric copolymer containing from about 15 to 32% by weight alpha-olefin, and having solubility in xylene at room temperature greater than 50% by weight, the intrinsic viscosity of the xylene soluble fraction ranging from about 3.0 to 5.0 dl / g; and(ii) a second elastomeric copolymer of propylene with at least one alpha-olefin of formula H2C=CHR, where R is H or a C2-C6 linear or branched alkyl, optionally containing 0.5 to 5% by weight of a diene, the second elastomeric copolymer containing more than 32% up to 45% by weight alpha-olefin, and having solubility in xylene at room temperature greater than 80% by weight, the intrinsic viscosity of the xylene soluble fraction ranging from about 4.0 to 6.5 dl / g; wherein the (b.i)Z(b.ii) weight ratio ranges from about 1:5 to 5: 1; wherein the total weight of (A) + (B) is 100 wt%.

7. The bitumen blend composition of claim 5, wherein the first heterophasic copolymer comprises:(A) from about 10 to 70% by weight of a copolymer of propylene and one or more comonomers) selected from ethylene and CH2=CHR alpha-olefins where R is a 2-8 carbon alkyl, wherein the copolymer contains from about 0 to 8% of co-monomer(s); and(B) from about 30 to 90% by weight of a copolymer of ethylene and (i) propylene or (ii) CH2=CHR alpha-olefins, where R is a 2-8 carbon alkyd radical, or (iii) a combinationthereof, optionally with minor amounts of a diene, with this copolymer containing from about 50% to 80% of ethylene. wherein the total weight of (A) + (B) is 100 wt%.

8. The bitumen blend composition of claim 5, wherein the second hetero phasic copolymer comprises:(A) from about 5 to 35% by weight of a propylene-based polymer containing 90% by weight or more of propylene units and 10% by weight or less of a fraction soluble in xylene at 25 °C;(B) from about 25 to 50% by weight of an ethylene homopolymer containing 5% by weight or less of a fraction soluble in xylene at 25°C; and(C) from about 30 to 60% by weight of a copolymer of ethylene and propylene containing from about 25% to 75% by weight of ethylene units and containing from about 55% to 95% by weight of a fraction soluble in xylene at 25°C. wherein the total weight of (A) + (B) + (C) is 100 wt%.

9. The bitumen blend composition of claim 5, wherein the second heterophasic copolymer comprises:(A) from about 5 to 35% by weight of a propylene-based polymer containing 90% by weight or more of propylene units and 10% by weight or less of a fraction soluble in xylene at 25 °C;(B) from about 25 to 50% by weight of a copolymer of ethylene and a C?-Cs alpha-olefin containing from about 0.1% to 20% by weight of alpha-olefin units and 75% by weight or less of a fraction soluble in xylene at 25°C; and(C) from about 30 to 60% by weight of a copolymer of ethylene and propylene containing from about 25% to 75% by weight of ethylene units and containing from about 55% to 95% by weight, of a fraction soluble in xylene at 25°C. wherein the total weight of (A) + (B) + (C) is 100 wt%.

10. The bitumen blend composition of claim 5, wherein the first heterophasic copolymer comprises:(A) from 30% to less than 70% of a semi-crystalline polypropylene component selected from the group consisting of a propylene homopolymer, a random copolymer of propylene containing up to 8% of ethylene, a random copolymer of propylenecontaining up to 8% of at least one C4-C10 a-olefin, or any combination thereof, wherein the semi-crystalline polypropylene component has a monomodal molecular weight distribution; and(B) greater than 30% to about 70% of a bipolymer component of propylene and at least one co-monomer selected from ethylene and / or C4-C10 a-olefins, wherein the bipolymer itself has from about 50% to about 75% of propylene, wherein the bipolymer is partially soluble in xylene at room temperature and has an intrinsic viscosity of from about 4 to 7.5 dl / g (in decalin). wherein the total weight of (A) + (B) is 100 wt%.

11. The bitumen blend composition of claim 5, wherein the second heterophasic copolymer comprises:(A) from about 10 to 60% by weight of a homopolymer of propylene with isotactic index greater than 80, or a copolymer having over 85% by weight of propylene with (i) ethylene or (ii) CH2=CHR alpha-olefins, where R is a 2-8 carbon alkyl radical, or combinations of (i) and (ii);(B) from about 5 to 20% parts by weight of a copolymer fraction containing ethylene that is insoluble in xylene at ambient temperature; and(C) from about 37 to 80% by weight of a copolymer fraction of ethylene and (i) propylene or (ii) another CH2=CHR a-olefin, or combinations of (i) and (ii), and, optionally, minor portions of a diene, wherein component (C) is less than 40% by weight of ethylene, being soluble in xylene at ambient temperature, and having an intrinsic viscosity from about 1.5 to 5 dl / g; wherein the total weight of (A) + (B) + (C) is 100 wt%; and the percent by weight of the sum of the (B) and (C) components with respect to the total polyolefin composition is from about 40% to 90% and the (B) / (C) weight ratio is lower than 0.4.

12. The bitumen blend composition of claim 5, wherein the second heterophasic copolymer comprises:(A) from about 5 to 35% by weight of a propylene and ethylene copolymer having 15% by weight or less of a fraction soluble in xylene at 25°C (XSA) referred to the weight of A, and having from about 0.5 wt% to 7.0 wt% of ethylene derived units;(B) from about 20 to 50% by weight of an ethylene homopolymer having 5% by weight or less of a fraction soluble in xylene at 25°C (XSB) referred to the weight of (B); and(C) from about 30 to 60% by weight of a terpolymer, wherein the terpolymer contains propylene, about 45% to 65% by weight of ethylene derived components, and from about 15% to 38% by weight of 1 -butene derived components, wherein the terpolymer has from about 30% to 85% by weight of a fraction soluble in xylene at 25°C (XSc), the amount of ethylene units; 1 -butene units and the fraction XSc being referred to the weight of (C), wherein the total weight of (A) + (B) + (C) is 100 wt%.

13. The bitumen blend composition of claim 5, wherein the second hetero phasic copolymer comprises:(A) from about 5 to 35% by weight of a propylene homopolymer containing 10% by weight or less of a fraction soluble in xylene at 25°C (XSA), the amount of the fraction XSA being referred to the weight of (A);(B) from about 20 to 50% by weight of an ethylene homopolymer having 5% by weight or less of a fraction soluble in xylene at 25°C (XSB) referred to the weight of (B); and(C) from about 30 to 60% by weight of a terpolymer, wherein the terpolymer contains propylene, about 45% to 65% by weight of ethylene derived components, and from about 15% to 38% by weight of 1 -butene derived components, wherein the terpolymer has from about 30% to 85% by weight of a fraction soluble in xylene at 25°C (XSc), the amount of ethylene units; 1 -butene units and the fraction XSc being referred to the weight of (C); wherein the total weight of (A) + (B) + (C) is 100 wt%.

14. The bitumen blend composition of claim 5, wherein the first heterophasic copolymer comprises:(A) from about 60 to 85% by weight of a broad molecular weight distribution propylene polymer having a poly dispersity index from about 5 to 15 and melt flow rate of from about 40 to 75 g / 10 min.; and(B) from about 15 to 40% by weight of a partially xylene-soluble olefin polymer rubber consisting of a poly(ethylene-co-propylene) containing at least 65% by weight of ethylene, wherein the xylene-insoluble content of (B) is 25- 40% by weight, measuredby dissolving the polymer in xylene at 135°C. cooling the solution to 25°C, allowing to settle for 30 minutes, followed by filtering; wherein the total weight of (A) + (B) is 100 wt%.

15. The bitumen blend composition of claim 5, wherein the first heterophasic copolymer comprises:(A) from about 25 to 50% by weight of a crystalline propylene homopolymer with a solubility in xylene at room temperature of less than or equal to 4%, or a crystalline copolymer of propylene with ethylene or a C4-C8 alpha-olefin having an ethylene or alpha-olefin content 0.5 to 3%, and a solubility in xylene at room temperature of from less than or equal to 4%; and(B) from about 50 to 75% by weight of a partially amorphous copolymer of ethylene with a C4-C8 alpha-olefin, wherein the alpha-olefin content is from about 10 to 20%, and the copolymer is from about 10 to 40% soluble in xylene at room temperature; wherein the total weight of (A) + (B) is 100 wt%.

16. The bitumen blend composition of claim 1, wherein the polyolefin recy elate comprises a polyethylene, a polypropylene, or a combination thereof.

17. The bitumen blend composition of claim 16, wherein the polyethylene comprises a high- density polyethylene (HDPE), a medium density polyethylene (MDPE), a low-density polyethylene (LDPE), a linear low-density polyethylene (LLDPE), or a combination thereof.

18. The bitumen blend composition of claim 16, wherein the polypropylene comprises: a propylene homopolymer; a random copolymer of propylene and ethylene and / or one or more C4-C20 alpha-olefins, wherein the maximum content of ethylene and / or alpha-olefins is 10% by weight, and the random copolymer has an isotactic index of at least 80; a heterophasic propylene polymer materials consisting essentially of by weight,(i) 99-55% of a polymeric material selected from the group consisting of a propylene homopolymer having an isotactic index greater than 90, and a crystalline copolymer of propylene and an alpha-olefin of the formula CH2=C14R, where R is H or a 2-6 carbon linear or branched alkyl group, having an isotactic index of at least 80, the alpha-olefin being less than 10% of the copolymer, and(li) 1-45% of an elastomeric olefin polymer of propylene and an olefinic material selected from the group consisting of alpha-olefins of the formula CH2=CHR, where R is H or a 2-6 carbon linear or branched alkyl group, the alpha-olefin being 50-70% of the elastomeric polymer; or a combination thereof.

19. The bitumen blend composition of claim 1 , wherein the filler component comprises a mineral filler, a fibrous filler, a fire retardant filler, an organic filler, a reflective filler, or a combination thereof.

20. A membrane comprising a moisture boundary layer comprising the bitumen blend composition of claim 1.

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