Hot melt adhesive composition comprising an environmentally friendly aliphatic plasticizer

Abstract

The present inventors have discovered a hot melt adhesive composition that can be formulated with a high percentage of environmentally friendly components and still provide performance over a wide temperature range. The present invention features a hot melt adhesive composition comprising 5 to 50 weight percent of a thermoplastic polymer, 10 to 80 weight percent of a bio-based tackifier, and 2 to 50 weight percent of an environmentally friendly aliphatic plasticizer having a ring aliphatic content of no more than 2 weight percent as tested by H-NMR spectroscopy. 1 H-NMR spectroscopy.

Description

Background Technology

[0001] In the field of industrial adhesives, hot melt adhesive compositions are commonly used to bond together a variety of products, including tapes, labels, boxes, cartons, and disposable absorbent products containing a nonwoven substrate, such as adult incontinence products, disposable diapers, sanitary napkins, mattresses, pet pads, medical dressings, etc.

[0002] Hot melt adhesive compositions comprise materials such as polymers, tackifiers, plasticizers, and waxes. These materials are typically derived from petroleum-based feedstocks. In recent years, there has been a need for hot melt adhesive compositions derived from bio-based materials, such as rosin-based and terpene-based tackifiers. A hot melt adhesive composition incorporating a bio-based tackifier is needed, which offers improved functionality over a wide temperature range. Summary of the Invention

[0003] In one aspect, the invention is characterized by a hot melt adhesive composition comprising 5% to 50% by weight of a thermoplastic polymer, 10% to 80% by weight of a bio-based tackifier, and 2% to 50% by weight of an environmentally friendly aliphatic plasticizer, the environmentally friendly aliphatic plasticizer having the effect of... 1 The content of cycloaliphatic compounds measured by H-NMR spectroscopy is no more than 2% by weight.

[0004] In one embodiment, the thermoplastic polymer is selected from the group consisting of olefin polymers, styrene block copolymers, their functionalized forms, and combinations thereof. In another embodiment, the hot melt adhesive composition has a content of at least 50% by weight, at least 70% by weight, or even 65% by weight to 100% by weight of a bio-based component.

[0005] In one embodiment, the environmentally friendly aliphatic plasticizer is a bio-based aliphatic plasticizer selected from the group consisting of straight-chain alkanes, branched alkanes, or combinations thereof. In another embodiment, the bio-based aliphatic plasticizer is derived from vegetable oils. In various embodiments, the bio-based aliphatic plasticizer is the product of the hydrogenation reaction of octadecane and hexadecane. In one embodiment, the bio-based aliphatic plasticizer is produced or derived from renewable resources. In a different embodiment, the bio-based aliphatic plasticizer has the characteristics of... 1 The amount measured by H-NMR spectroscopy is no more than 1% by weight or by means of H-NMR spectroscopy. 1 The cycloaliphatic content measured by H-NMR spectroscopy is even less than 0.5% by weight.

[0006] In one embodiment, the bio-based tackifier has a ring and ball softening point of 80°C to 120°C as reported by the supplier. In another embodiment, the bio-based tackifier has a pure melt Gardner color of 0 to 4. In yet another embodiment, the bio-based tackifier is selected from the group consisting of rosin-based tackifiers and terpene-based tackifiers. In various embodiments, the bio-based tackifier is a terpene-based tackifier. In one embodiment, the bio-based tackifier is a rosin-based tackifier. In another embodiment, the rosin-based tackifier has a pure melt Gardner color of 0 to 2. In yet another embodiment, 70% to 100% by weight of the bio-based tackifier is derived from or produced from renewable resources.

[0007] In one embodiment, the thermoplastic polymer is selected from the group consisting of environmentally friendly bio-based polymers deemed sustainable by a mass balance method and thermoplastic polymers. In another embodiment, the thermoplastic polymer is a styrene block copolymer. In one embodiment, the styrene block copolymer is selected from the group consisting of styrene-butadiene-styrene, styrene-isoprene-styrene, and combinations thereof. In another embodiment, the styrene block copolymer has an average styrene content of 20% to 70% by weight. In various embodiments, the styrene block copolymer has an average styrene content of 20% to 45% by weight.

[0008] In one aspect, the hot melt adhesive composition comprises 10% to 40% by weight of a thermoplastic polymer (which comprises a styrene block copolymer), 15% to 75% by weight of a bio-based tackifier, and 5% to 40% by weight of an environmentally friendly aliphatic plasticizer, which has the effect of... 1 The content of cycloaliphatic compounds measured by H-NMR spectroscopy is no more than 2% by weight.

[0009] In one embodiment, the invention is characterized by an article selected from the group consisting of tapes, labels, and disposable absorbent articles comprising the hot-melt adhesive composition of the invention. In different embodiments, the article is selected from the group consisting of paper tapes and paper labels. In another embodiment, the invention is characterized by a disposable absorbent article comprising a first substrate, a second substrate, and the hot-melt adhesive composition of the invention, wherein the hot-melt adhesive composition is disposed on at least one of the first substrate and the second substrate. In one embodiment, at least one of the substrates is bio-based. In another embodiment, the bio-based substrate is cotton.

[0010] The inventors have discovered a hot melt adhesive composition that can be formulated with a high percentage of environmentally friendly or even bio-based components while still providing performance over a wide temperature range. Detailed Implementation

[0011] definition

[0012] "Renewable resources" are used herein to refer to resources produced through natural processes at a rate commensurate with their consumption. Resources can be replenished naturally or through engineered agricultural techniques. Examples of renewable resources include, but are not limited to, plants (e.g., sugarcane, sugar beets, corn, potatoes, citrus fruits (e.g., oranges), woody plants, cellulose waste, etc.), animals, fish, bacteria, fungi, and forestry products (e.g., pine and spruce). These resources can be naturally occurring, hybrid, or genetically engineered organisms. Natural resources (such as crude oil, coal, and natural gas) are not considered renewable because they are derived from materials that will be depleted or will not be replenished for thousands or even millions of years.

[0013] "Bio-based" is used herein to refer to components of a hot melt adhesive composition that are at least partially generated or partially derived from renewable resources.

[0014] "Environmentally friendly" is used herein to refer to components of a hot melt adhesive composition that have at least one property selected from the group consisting of bio-based components and have a total cradle-to-gate CO2 emission value of less than 1.5 kg CO2e / kg as assessed by ISO-14040 / 14044. The total emission value is the sum of bio- and non-bio-based carbon emissions.

[0015] Hot melt adhesive composition

[0016] The present invention is characterized by a hot melt adhesive composition comprising 5% to 50% by weight of a thermoplastic polymer, 10% to 80% by weight of a bio-based tackifier, and 2% to 50% by weight of an environmentally friendly aliphatic plasticizer having a cycloaliphatic content of not more than 2% by weight as determined by 1H-NMR spectroscopy.

[0017] In another embodiment, the invention is characterized by a hot melt adhesive composition comprising 10% to 40% by weight of a thermoplastic polymer (which comprises a styrene block copolymer), 15% to 75% by weight of a bio-based tackifier, and 5% to 40% by weight of an environmentally friendly aliphatic plasticizer having a cycloaliphatic content of no more than 2% by weight as determined by 1H-NMR spectroscopy.

[0018] The invention is further characterized by a hot melt adhesive composition comprising 5% to 50% by weight of a thermoplastic polymer, 10% to 80% by weight of a bio-based tackifier, and 2% to 50% by weight of a bio-based aliphatic plasticizer, wherein the bio-based aliphatic plasticizer has the effect of... 1 The content of cycloaliphatic compounds measured by H-NMR spectroscopy is no more than 2% by weight.

[0019] In another embodiment, the invention is characterized by a hot melt adhesive composition comprising 10% to 40% by weight of a thermoplastic polymer (which comprises a styrene block copolymer), 15% to 75% by weight of a bio-based tackifier, and 5% to 40% by weight of a bio-based aliphatic plasticizer, the bio-based aliphatic plasticizer having the effect of... 1 The content of cycloaliphatic compounds measured by H-NMR spectroscopy is no more than 2% by weight.

[0020] In another embodiment, the invention is characterized by a hot melt adhesive composition comprising 10% to 30% by weight of a thermoplastic polymer (which comprises a styrene block copolymer), 45% to 75% by weight of a bio-based tackifier, and 10% to 30% by weight of a bio-based aliphatic plasticizer having a cycloaliphatic content of not more than 2% by weight as determined by 1H-NMR spectroscopy.

[0021] Hot melt adhesive compositions may be free of petroleum-derived tackifiers. Hot melt adhesive compositions may be free of both petroleum-derived tackifiers and petroleum-derived plasticizers.

[0022] The hot melt adhesive composition of the present invention contains a high weight percentage of environmentally friendly components. These environmentally friendly components may be bio-based.

[0023] The bio-based component is produced or derived from renewable resources. The bio-based component may be produced or derived from renewable resources at least 25% by weight, at least 50% by weight, at least 75% by weight, at least 85% by weight, at least 90% by weight, at least 95% by weight, 60% to 85% by weight, 60% to 95% by weight, 60% to 100% by weight, 65% to 100% by weight, 75% to 100% by weight, 80% to 100% by weight, or even 100% by weight (i.e., entirely) from renewable resources.

[0024] Based on total carbon content, according to ASTM 6866-20, bio-based components may have a bio-based carbon content of at least 25%, at least 30%, at least 50%, at least 60%, at least 70%, at least 80%, at least 90%, 25% to 100%, 50% to 100%, 70% to 100%, 90% to 100%, or even 100%.

[0025] The hot melt adhesive composition may contain at least 45 wt%, at least 50 wt%, at least 55 wt%, at least 60 wt%, at least 65 wt%, at least 70 wt%, at least 75%, at least 80 wt%, 50 wt% to 95 wt%, 50 wt% to 100 wt%, 55 wt% to 100 wt%, 60 wt% to 100 wt%, 65 wt% to 100 wt%, 70 wt% to 100 wt%, 75 wt% to 100 wt%, 80 wt% to 100 wt%, or even 100 wt% of components selected from those having a total CO2 emission of less than 1.5 kg CO2 and being bio-based.

[0026] Environmentally friendly components may have total CO2 emissions of less than 1.5 kg CO2, less than 1.0 kg CO2e / kg, less than 0.5 kg CO2e / kg, or even less than 0 kg CO2e / kg.

[0027] The hot melt adhesive composition of the present invention can have a Brookfield viscosity of less than 15,000 cP, less than 10,000 cP, 500 cP to 20,000 cP, or even 500 cP to 15,000 cP at 149°C.

[0028] The hot melt adhesive composition of the present invention utilizes a method having the following properties: 1An environmentally friendly aliphatic plasticizer with a cyclic aliphatic content of no more than 2%, as tested by H-NMR spectroscopy. The inventors have discovered that this unique environmentally friendly aliphatic plasticizer can increase the bio-based content of a composition while still providing performance over a wide temperature range, as indicated by the increased temperature plateau range compared to compositions containing prior art bio-based plasticizers (e.g., Comparative Example 1 vs. Comparative Example 1).

[0029] The temperature plateau range is a predictor of the temperature range at which a hot-melt adhesive composition will have consistent cohesive strength. Furthermore, an upper limit of temperature plateau greater than 60°C helps prevent cold flow during storage and transportation.

[0030] thermoplastic polymers

[0031] The hot-melt composition comprises a thermoplastic polymer. The thermoplastic polymer may include one or more thermoplastic polymers.

[0032] Thermoplastic polymers can be environmentally friendly or even bio-based. Bio-derived monomers can be used to prepare bio-based thermoplastic polymers. Thermoplastic polymers prepared with bio-derived monomers are expected to have similar properties to those prepared with petroleum-derived monomers. Bio-derived monomers can be selected from the group consisting of ethylene, propylene, isoprene, butadiene, styrene, etc. However, the available bio-derived monomers are not limited to this group. Bio-derived monomers are typically derived from cellulose, starch, and sugars such as glucose.

[0033] Alternatively, thermoplastic polymers can be considered sustainable even if the bio-based origin cannot be detected by radiocarbon dating (ASTM 6866-20) due to time or dilution effects, but sustainability is demonstrated by relevant mass balance methods (e.g., International Sustainable Carbon Certification (ISCC) plus mass balance method).

[0034] Alternatively, the thermoplastic polymer may be derived from petroleum-based materials. Depending on cost and availability, environmentally friendly bio-based polymers and petroleum-based thermoplastic polymers deemed sustainable through a mass balancing approach may be combined in any ratio in this invention. Recycled thermoplastic polymers may also be used alone or in combination with bio-based sustainable polymers and / or petroleum-based thermoplastic polymers through a mass balancing approach.

[0035] Thermoplastic polymers can be selected from the group consisting of free olefin polymers, styrene block copolymers, their functionalized forms (e.g., hydroxyl-modified or maleic anhydride-modified), and combinations thereof.

[0036] The olefin polymer may be selected from the group consisting of vinyl polymers (e.g., ethylene homopolymers and ethylene copolymers), propylene-based polymers (e.g., propylene homopolymers and propylene copolymers), their functionalized forms (e.g., hydroxyl-modified or maleic anhydride-modified), and combinations thereof.

[0037] Thermoplastic polymers can be prepared using a variety of catalysts, including, for example, single-site catalysts (e.g., metallocene catalysts (e.g., metallocene-catalyzed ethylene-α-olefin copolymers), geometry-restricted catalysts (e.g., homogeneous linear or substantially linear ethylene-α-olefin copolymers prepared from ethylene and α-olefin comonomers using geometry-restricted catalysts and having a polydispersity index of no more than 2.5 and long-chain branching)), multiple-site catalysts, Ziegler-Natta catalysts, and combinations thereof.

[0038] Thermoplastic polymers may include functional groups (i.e., functionalized groups), including, for example, carboxylic acid groups, anhydride groups (e.g., maleic anhydride), and combinations thereof.

[0039] If the hot melt adhesive composition comprises a functionalized thermoplastic polymer, it may also comprise an unfunctionalized second thermoplastic polymer. The hot melt adhesive composition may comprise 3% to 25% by weight, 5% to 25% by weight, or even 5% to 15% by weight of the functionalized thermoplastic polymer. The hot melt adhesive composition may also comprise 3% to 25% by weight, 5% to 25% by weight, or even 5% to 15% by weight of the unfunctionalized second thermoplastic polymer.

[0040] If petroleum-based polymers are used, the amount of thermoplastic polymers can be limited to maximize the bio-based material content.

[0041] The hot melt adhesive composition may contain 3% to 60% by weight, 5% to 60% by weight, 10% to 50% by weight, 10% to 40% by weight, 10% to 30% by weight, 3% to 25% by weight, 10% to 25% by weight, or even 12% to 20% by weight of thermoplastic polymer.

[0042] Olefin polymers

[0043] Thermoplastic polymers can be olefin polymers. Olefin polymers can be selected from the group consisting of vinyl polymers and propylene polymers.

[0044] The polymer may be a vinyl polymer having a density of not more than 0.90 g / cm³ or even not more than 0.88 g / cm³. The vinyl polymer may be an ethylene α-olefin copolymer. The α-olefin monomer has at least three carbon atoms or even 3 to 20 carbon atoms, and suitable examples include propylene, isobutylene, butene, pentene, hexene, heptene, octene, nonene, decene, dodecene, 4-methyl-1-pentene, 3-methylpentene-1,3,5,5-trimethyl-hexene-1,5-ethyl-1-nonene, and combinations thereof. Specific examples of suitable ethylene copolymers include ethylene-propylene, ethylene-butene, ethylene-hexene, ethylene-octene, and combinations thereof.

[0045] Available ethylene α-olefin copolymers are commercially available under various trade names, including, for example, the AFFINITY series of trade names from DowDuPont Chemical Company (Midland, Michigan), such as AFFINITY GA 1875, AFFINITY GA 1900 and AFFINITY GA 1950 ethylene-octene elastomers, AFFINITY GA 1000R maleic anhydride-modified ethylene-octene copolymer (which is also referred to by the manufacturer as an interpolymer), and AFFINITY ethylene-propylene copolymer; and the ENGAGE series of trade names from DowDuPont Chemical Company (Midland, Michigan), including ENGAGE 8200, ENGAGE 8401 and ENGAGE 8402 ethylene-octene copolymers.

[0046] Thermoplastic polymers can be propylene-based polymers. Propylene-based polymers can be selected from the group consisting of propylene α-olefin copolymers and propylene homopolymers.

[0047] Propylene-α-olefin copolymers are derived from propylene and at least one α-olefin comonomer other than propylene (e.g., C2 and C4-C20 α-olefin comonomers and combinations thereof). Available α-olefin comonomers include, for example, α-olefin monomers having at least two carbon atoms, at least four carbon atoms, four to eight carbon atoms, and combinations thereof. Examples of suitable classes of α-olefin comonomers include mono-α-olefins (i.e., one unsaturated double bond) and higher α-olefins (e.g., dienes (e.g., 1,9-decadiene)). Suitable α-olefin monomers include, for example, ethylene, butene, pentene, hexene, heptene, octene, nonene, decene, dodecene, 4-methylpentene-1,3-methylpentene-1,3,5,5-trimethylhexene-1,5-ethyl-1-nonene, and combinations thereof. Specific examples of suitable propylene-α-olefin copolymers include propylene-ethylene, propylene-butene, propylene-hexene, propylene-octene, and combinations thereof.

[0048] Available propylene-α-olefin copolymers include, for example, copolymers of at least two different propylene-α-olefin copolymers, terpolymers, and more advanced polymers, mixtures, and combinations thereof. Available propylene-α-olefin copolymers also include, for example, modified, unmodified, grafted, and ungrafted propylene-α-olefin copolymers, unimodal propylene-α-olefin polymers, multimodal propylene-α-olefin copolymers, and combinations thereof. The term "multimodal" refers to a polymer having a multimodal molecular weight distribution (weight-average molecular weight (Mw) / number-average molecular weight (Mn)) determined by size exclusion chromatography (SEC). Suitable commercially available propylene-α-olefin copolymers are available under various trade names, including, for example, the VISTAMAXX series of trade names from ExxonMobil Chemical Company (Houston, Texas), including VISTAMAXX 6202 propylene-ethylene copolymer, VISTAMAXX 8880 propylene-ethylene copolymer, and VISTAMAXX 8380 propylene-ethylene copolymer. Suitable propylene homopolymers are commercially available under various trade names, including, for example, L-MODU S400S410, S600 and S901 propylene homopolymers from Idemitsu Kosan Co., Ltd. (Japan).

[0049] Styrene block copolymer

[0050] Thermoplastic polymers can be styrene block copolymers.

[0051] The styrene block copolymer has at least one A block comprising styrene; and at least one B block comprising, for example, an elastomeric conjugated diene (e.g., hydrogenated and unhydrogenated conjugated diene), a sesquiterpene (e.g., hydrogenated and unhydrogenated sesquiterpene), and combinations thereof. The A and B blocks are linked to each other in any manner, such that the resulting copolymer exhibits a variety of structures, including, for example, random, linear, branched, radial, star-shaped, comb-shaped, conical, and combinations thereof. The block copolymer can exhibit any form, including, for example, linear AB blocks, linear ABA blocks, linear A-(BA)nB multiblocks, A-(BA)nA multiblocks and radial (AB)nY blocks (where Y is a multivalent compound and n is an integer of at least 3), tetrablock copolymers (e.g., ABAB), and pentablock copolymers having the structure ABABA. The adhesive composition may comprise a blend of at least two different block copolymers.

[0052] Suitable styrene A blocks include, for example, styrene, α-methylstyrene, o-methylstyrene, m-methylstyrene, p-methylstyrene, p-tert-butylstyrene, 2,4-dimethylstyrene, 2,4,6-trimethylstyrene, and combinations thereof.

[0053] Suitable block elastomer conjugated diene B-blocks include, for example, butadiene (e.g., polybutadiene), isoprene (e.g., polyisoprene), 2,3-dimethyl-1,3-butadiene, 1,3-pentadiene, 1,3-hexadiene, styrene-butadiene copolymers, and combinations thereof, as well as their hydrogenated forms (including, for example, ethylene, propylene, butene, and combinations thereof). Suitable B-block sesquiterpenes include, for example, β-farnesene.

[0054] Available styrene block copolymers include, for example, styrene-butadiene (SB), styrene-butadiene-styrene (SBS), styrene-isoprene block copolymers (SI), styrene-isoprene-styrene (SIS), styrene-ethylene-butene-styrene (SEBS), styrene-ethylene-propylene-styrene (SEPS), styrene-isobutene-styrene, styrene-butadiene-butene-styrene (SBBS), and combinations thereof. Particularly available block copolymers include styrene-butadiene-styrene, styrene-isoprene-styrene, and combinations thereof.

[0055] Styrene block copolymers may include more than one type of styrene block copolymer. When more than one type of styrene block copolymer is included, the styrene content, diblock content, and melt flow rate range specified below are weight averages of all available grades.

[0056] For example, if a hot melt adhesive composition comprises two styrene block copolymers A and B. Polymer A is present at 25% by weight (wA), wherein the styrene content is 15% by weight (sA), and polymer B is present at 25% by weight (wB), wherein the styrene content is 20% by weight (sB). The average styrene content of the styrene block copolymers is calculated as follows:

[0057] wA / (wA+wB)*sA+wB / (wA+wB)*sB=0.5(15)+0.5(20)=17.5% by weight.

[0058] Styrene block copolymers may have an average styrene content of 20% to 75% by weight or even 20% to 45% by weight.

[0059] Styrene block copolymers may contain 0% to 50% by weight, 5% to 50% by weight, or even 10% to 40% by weight of diblocks.

[0060] Styrene block copolymers may have an average melt flow rate (MFR) of 0.5 to 40, 4 to 35, or even 8 to 30 g / 10 min according to ASTM D 1238 (200°C / 5kg).

[0061] Available block copolymers include VECTOR series products from Taiwan Synthetic Rubber Corporation (TSRC) (Taiwan, China), including VECTOR 4211 and DPX-660 styrene-isoprene-styrene block copolymers; KIBITON products from Chi Mei Corporation (Taiwan, China), including KIBITON PB-5502; GLOBALPRENE products from LCY Group (Taiwan, China), including GLOBALPRENE 3546; JH-8151 from Ningbo Jinhai Chenguang Chemical Corporation (Zhejiang, China); and STYROFLEX products from Ineos Styrolution (Frankfurt, Germany), including STYROFLEX 2G66; and S-TPE (styrene-butadiene with thermoplastic elastomer properties).

[0062] The hot melt adhesive composition may contain 5% to 50% by weight, 10% to 40% by weight, 10% to 30% by weight, 10% to 25% by weight, 12% to 25% by weight, or even 15% to 25% by weight of styrene block copolymer.

[0063] Bio-based thickeners

[0064] Bio-based tackifiers include one or more bio-based tackifiers. Bio-based tackifiers can be liquid or solid; however, bio-based tackifiers that are solid at room temperature (18°C to 26°C) are preferred. Bio-based tackifiers may have a ring and ball softening point of at least 80°C, at least 90°C, 80°C to 140°C, 80°C to 120°C, or even 80°C to 105°C, as reported by the supplier.

[0065] Available bio-based tackifiers may include terpene-based tackifiers (e.g., terpenes, modified terpenes and their hydrogenated forms) and rosin-based tackifiers (e.g., natural rosin, modified rosin, rosin esters and their hydrogenated forms), sucrose benzoates and oligomeric resins derived from other biological sources (e.g., isosorbide, isomannitol, lignin, etc.).

[0066] Bio-based tackifiers (such as terpene-based tackifiers, rosin-based tackifiers, etc.) can be modified with materials such as styrene, phenol, carboxylic acids, acid anhydrides (such as maleic anhydride) and combinations thereof.

[0067] Examples of available terpenes and modified terpenes include those derived from α-pinene, β-pinene, γ-limonene, dipentene, or mixtures thereof, and modified terpenes.

[0068] Examples of available rosin-based tackifiers include natural and modified rosins (e.g., disproportionated rosin), including rosin resin, wood rosin, float rosin, distilled rosin, hydrogenated rosin, dimer rosin, and polymeric rosin (e.g., rosin esters). Examples of available rosin esters include, for example, glycerol esters of light-colored wood rosin, glycerol esters of hydrogenated rosin, glycerol esters of polymeric rosin, and pentaerythritol esters of natural and modified rosin, including pentaerythritol esters of light-colored wood rosin, pentaerythritol esters of hydrogenated rosin, pentaerythritol esters of tall oil rosin, and phenol-modified pentaerythritol esters of rosin.

[0069] Available rosin-based tackifiers include near-water-white rosin ester tackifiers obtained by the methods taught in US10611926B2 and US2020199408A1, which are incorporated herein by reference.

[0070] Bio-based tackifiers with relatively low pure melt Gardner color are preferred. Bio-based tackifiers may have a pure melt Gardner color of no more than 4, no more than 2, no more than 1, 0 to 4, or even 0 to 2.

[0071] In one embodiment, the bio-based tackifier is a rosin-based tackifier having a pure melt Gardner color of no more than 4, no more than 2, no more than 1, 0 to 4, or even 0 to 2.

[0072] The hot melt adhesive composition may contain 10% to 80% by weight, 15% to 75% by weight, 20% to 75% by weight, 20% to 70% by weight, 35% to 70% by weight, 45% to 70% by weight, or even 50% to 65% by weight of environmentally friendly or even bio-based tackifier.

[0073] Available bio-based tackifiers are commercially available under various trade names, including rosin ester tackifiers such as SYLVALITE RE100L, SYLVALITE 9100, and SYLVALITE RE 105L, available under the trade name SYLVALITE from Kraton Corporation (USA); rosin ester tackifiers such as KOMOTAC KM-100, available under the trade name KOMOTAC from Guangdong Komo Co. Ltd.; terpene tackifiers such as SYLVARES 6100, SYLVARES TR M1115, and SYLVARES TP 2040, available under the trade name SYLVARES from Kraton Corporation (USA); and terpene tackifiers such as PICCOLYTE S85 and PICCOLYTE F105IG, available under the trade name PICCOLYTE from DRT (France).

[0074] Environmentally friendly aliphatic plasticizers

[0075] The hot-melt adhesive composition contains an environmentally friendly aliphatic plasticizer having a cycloaliphatic content of no more than 2 wt%, no more than 1 wt%, no more than 0.5 wt%, 0 wt% to 2 wt%, 0 wt% to 1 wt%, or even 0 wt% to 0.5 wt%, as determined by 1H-NMR spectroscopy. The environmentally friendly aliphatic plasticizer may have CO2 emissions of less than 1.0 kg CO2e / kg or even less than 0 kg CO2e / kg.

[0076] In a preferred embodiment, the environmentally friendly aliphatic plasticizer is bio-based and has a total CO2 emission value of less than 1.5 kg CO2e / kg, less than 1.0 kg CO2e / kg, less than 0.5 kg CO2e / kg, or even less than 0 kg CO2e / kg.

[0077] Environmentally friendly aliphatic plasticizers may be present in amounts of 2 wt% to 60 wt%, 5 wt% to 50 wt%, 5 wt% to 40 wt%, 5 wt% to 35 wt%, 8 wt% to 35 wt%, 8 wt% to 30 wt%, 10 wt% to 30 wt%, or even 12 wt% to 30 wt%.

[0078] Bio-based aliphatic plasticizers

[0079] With the ability to 1 Environmentally friendly aliphatic plasticizers with a cyclic aliphatic content of no more than 2% by weight, as measured by ¹H NMR spectroscopy, can be bio-based. Bio-based aliphatic plasticizers can be selected from the group consisting of free straight-chain alkanes, branched alkanes, or combinations thereof. Bio-based aliphatic plasticizers can be hydrogenation products of octadecane and hexadecane. Bio-based aliphatic plasticizers have fewer cyclic aliphatic and aromatic ring structures. Bio-based aliphatic plasticizers may include one or more bio-based aliphatic plasticizers.

[0080] The inventors have discovered that, when used in combination with bio-based thickeners, compositions containing a high percentage of bio-based components can be obtained that exhibit properties over a wide temperature range, such as those observed over a wider temperature plateau.

[0081] Bio-based aliphatic plasticizers may have a cyclic aliphatic content of no more than 2 wt%, no more than 1.5 wt%, no more than 1 wt%, no more than 0.75 wt%, no more than 0.5 wt%, no more than 0.25 wt%, 0 wt% to 2 wt%, 0 wt% to 1 wt%, 0 wt% to 0.5 wt%, or even 0 wt% to 0.25 wt%, as determined by 1H-NMR spectroscopy.

[0082] Bio-based aliphatic plasticizers are derived from renewable resources, such as bacteria, fermentation materials, animal oils, vegetable oils (e.g., rapeseed oil, corn oil, soybean oil, epoxidized soybean oil, palm oil, nut oils (e.g., peanut oil, cashew oil, etc.), olive oil, sunflower oil, rapeseed oil, jatropha oil, coconut oil, castor oil, etc.).

[0083] Bio-based aliphatic plasticizers may have a bio-based content of 25% to 100% by weight, 50% to 100% by weight, 75% to 100% by weight, or even 100% by weight.

[0084] Bio-based aliphatic plasticizers may be present in amounts of 2 wt% to 60 wt%, 5 wt% to 50 wt%, 5 wt% to 40 wt%, 5 wt% to 35 wt%, 8 wt% to 35 wt%, 8 wt% to 30 wt%, 10 wt% to 30 wt%, or even 12 wt% to 30 wt%.

[0085] Available bio-based aliphatic plasticizers are available under the trade name VIVASPES from H&R Group, Inc. (Houston, Texas), including, for example, VIVASPES 10227 and VIVASPES 10229.

[0086] Non-environmentally friendly aliphatic plasticizers

[0087] The hot melt adhesive composition may also contain a non-environmentally friendly aliphatic plasticizer. Non-environmentally friendly aliphatic plasticizers have fewer cyclic aliphatic and aromatic ring structures. Non-environmentally friendly aliphatic plasticizers may include one or more aliphatic plasticizers.

[0088] Non-environmentally friendly aliphatic plasticizers can be selected from aliphatic oils, white mineral oils, paraffin oils, gas-to-liquid (GTL) oils, synthetic liquid oligomers of polyolefins (such as polyisobutylene, polybutene, and polypropylene), hydrocarbon fluids, their functionalized forms, their hydrogenated or hydrotreated forms, and combinations thereof.

[0089] Non-environmentally friendly aliphatic plasticizers may have the ability to pass 1 The cycloaliphatic content measured by H-NMR spectroscopy is no more than 2 wt%, no more than 1 wt%, no more than 0.5 wt%, 0 wt% to 2 wt%, 0 wt% to 1 wt%, or even 0 wt% to 0.5 wt%.

[0090] The addition of non-environmentally friendly aliphatic plasticizers may be present in 2% to 50% by weight, 2% to 30% by weight, 2% to 25% by weight, or even 2% to 20% by weight.

[0091] Available additional aliphatic plasticizers include, for example, DURASYN 166, which is available under the trade name DURASYN from INEOS Chemicals Co. (London, UK); white mineral oils, for example, PURETOL 35, which is available under the trade name PURETOL from Petro-Canada Lubricants Inc. (Mississauga, Ontario); and TPC1160, a polyisobutylene available from TPC Group (Houston, Texas).

[0092] wax

[0093] Hot melt adhesive compositions may be wax-free or contain wax. Like polymers, waxes can be environmentally friendly or even bio-based.

[0094] Available wax categories include, for example, paraffin wax, microcrystalline wax, high-density low molecular weight polyethylene wax, by-product polyethylene wax, polypropylene wax, Fischer-Tropsch wax, oxidized Fischer-Tropsch wax, functionalized waxes such as acid, anhydride and hydroxyl-modified waxes, animal waxes, plant waxes (e.g., soybean wax), and combinations thereof.

[0095] The waxes available are solid at room temperature and preferably have a ring and ball softening point of 50°C to 170°C.

[0096] The wax may be acrylic-based and has a Mettler softening point greater than 130°C, 140°C, or even 150°C. Available waxes are commercially available from several suppliers, including polypropylene and polyethylene waxes from Westlake Chemical Corporation (Houston, Texas) under the EPOLENE N and C series trade names, such as EPOLENE N-21 and EPOLENE N-15; polypropylene and polyethylene waxes from Clariant International Ltd. (Muttenz, Switzerland) under the LICOCENE series trade names, such as LICOCENE PP 6102, LICOCENE PP 6502TP, and LICOCENE PP7502TP; and Fischer-Tropsch waxes from Shell MDS (Malaysia) Sdn Bhd under the SARAWAX series trade names, including GTL SARAWAX SX105.

[0097] The hot melt adhesive composition may contain no more than 10% by weight, no more than 5% by weight, 2% to 10% by weight, or even 3% to 8% by weight of wax.

[0098] Additional tackifier

[0099] Hot melt adhesive compositions may include additional tackifiers, including those derived from petroleum-based feedstocks. Examples of available additional tackifiers include hydrocarbon tackifiers. Hydrocarbon tackifiers include, for example, aromatic, aliphatic, and cycloaliphatic hydrocarbon resins and their hydrogenated forms; aromatic-modified aliphatic or cycloaliphatic hydrocarbon resins and their hydrogenated forms; and combinations thereof.

[0100] Examples of available aliphatic and cycloaliphatic petroleum hydrocarbon resins include aliphatic and cycloaliphatic petroleum hydrocarbon resins (including, for example, branched or unbranched C9 and C10 resins) and their hydrogenated derivatives.

[0101] Additional tackifiers are present in amounts not exceeding 20% ​​by weight, not exceeding 15% by weight, not exceeding 10% by weight, not exceeding 5% by weight, 0% to 20% by weight, or even 5% to 20% by weight.

[0102] Additional components

[0103] The thermal adhesive composition optionally includes additional components, including, for example, petroleum-derived tackifiers, additional polymers (e.g., olefin polymers, ethylene-vinyl copolymers (e.g., ethylene vinyl acetate)), and a limited amount of [unclear - possibly a specific ingredient or component]. 1 H-NMR spectroscopy is used to test plasticizers (e.g., naphthenic oils, standard vegetable oils, etc.) with a cycloaliphatic content greater than 2% by weight, stabilizers, antioxidants, adhesion promoters, UV stabilizers, colorants (e.g., pigments and dyes), fillers, surfactants, fragrances, detergents, co-extruded coatings, packaging films, wetting indicators, superabsorbents, and combinations thereof.

[0104] Available antioxidants include, for example, pentaerythritol tetrakis[3,(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 2,2'-methylenebis(4-methyl-6-tert-butylphenol), phosphites (including, for example, tri-(p-nonylphenyl)-phosphite (TNPP) and bis(2,4-di-tert-butylphenyl)4,4'-diphenyl-diphosphonate), di-stearyl-3,3'-thiodipropionate (DSTDP), and combinations thereof. Available antioxidants are commercially available under various trade names, including, for example, the IRGANOX series, including hindered phenolic antioxidants such as IRGANOX 1010, IRGANOX 565, and IRGANOX 1076, and phosphite antioxidant IRGAFOS 168 (all available from BASF Corporation, Florham Park, New Jersey), and ETHYL 702 4,4'-methylenebis(2,6-di-tert-butylphenol). When present, the adhesive composition preferably contains 0.1% to 3% by weight of the antioxidant.

[0105] use

[0106] The hot melt adhesive compositions of the present invention can be used in many different applications and various end uses, including pressure-sensitive adhesives (e.g., removable and permanent types), binding adhesives, adhesives for attaching inserts to exposed materials (e.g., magazines), adhesives for assembling various articles (e.g., filters), adhesives for packaging constructions (e.g., boxes, cartons, pallets, etc.), adhesives for tapes and labels, and adhesives for disposable articles.

[0107] tape and labels

[0108] The hot-melt adhesive composition of this invention can be used to prepare adhesive tapes or to adhere labels to various articles (e.g., containers, magazines, etc.). The labels / tapes can be selected from a variety of materials, including paper, non-paper films (e.g., polypropylene (e.g., polypropylene (PP), oriented polypropylene (OP), and biaxially oriented polypropylene (BOPP)), polyethylene, etc.). Containers can be metal (e.g., aluminum or steel) or plastic (polyethylene terephthalate (PET), high-density polyethylene (HDPE), and polypropylene).

[0109] A label can be a dot label, meaning it doesn't completely wrap around the container. Alternatively, a label can be a wrapping label, meaning it completely wraps around the entire container.

[0110] If the label is a wrap-around label, it can be rolled into an applicator. Alternatively, the label is pre-cut and fed from a stack. In wrap-around label application methods, label material is fed into a label station. Pick-up adhesive and overlap adhesive are then typically applied to the label from the same glue container. The pick-up adhesive adheres the leading edge of the label to the container. The overlap adhesive then bonds the overlapping portions of the wrap-around label itself. The hot melt adhesive composition of the present invention can be both a pick-up adhesive and an overlap adhesive.

[0111] Single absorbent products

[0112] The hot melt adhesive composition can be applied (i.e., brought into direct contact) or bonded to a variety of substrates, including, for example, membranes (e.g., polyolefin (e.g., polyethylene and polypropylene) membranes), bio-based membranes, release liner, porous substrates, cellulose substrates, sheets (e.g., paper and fiber sheets), paper products, woven and nonwoven fiber webs, fibers (e.g., synthetic polymer fibers and cellulose fibers), and tape backings.

[0113] The hot melt adhesive composition can also be used in a variety of applications and constructions, including, for example, disposable absorbent articles, including, for example, disposable diapers, adult incontinence products, sanitary napkins, medical dressings (e.g., wound care products), bandages, surgical pads, pet training pads (e.g., pet mats), and meat packaging products, as well as components of absorbent articles, including, for example, absorbent elements, absorbent cores, impermeable layers (e.g., backsheets), tissues (e.g., wrapping tissues), liquid collection layers, and woven and nonwoven fiber web layers (e.g., topsheets, absorbent tissues) and elastic materials.

[0114] Hot melt adhesive compositions can be used on substrates made of a variety of fibers, including, for example, natural cellulose fibers (such as wood pulp, cotton, viscose, starch, etc.), silk, PLA (polylactic acid), PHA (polyhydroxyalkanoate), PBS (polybutylene succinate), PBAT (polybutylene adipate terephthalate), and wool; synthetic fibers such as nylon, rayon, polyester, acrylics, polypropylene, polyethylene, polyvinyl chloride, polyurethane, and glass; recycled fibers, and various combinations thereof.

[0115] Hot melt adhesive compositions can be used in a variety of films, including polyethylene, polypropylene, ethylene vinyl acetate, ethylene copolymers, and bio-based films (e.g., PLA, PHA, starch, etc.).

[0116] A variety of application techniques can be used to apply the composition to the substrate, including, for example, trough coating, spraying (including, for example, spin spraying and random spraying), screen printing, foaming, embossing rollers, extrusion and meltblown application techniques.

[0117] Methods for producing disposable absorbent products

[0118] The hot-melt adhesive compositions of the present invention can be used in a variety of applications within disposable absorbent articles. The hot-melt adhesive compositions can be used as a construction adhesive (e.g., for bonding a backing sheet to a nonwoven material and optionally an absorbent pad), as a positioning adhesive (e.g., for adhering a disposable absorbent article to underwear), as an elastic attachment adhesive (e.g., for bonding elastic material to a backing sheet in areas such as the legs or waist), or for attaching elastic material to any other part of the article, and for core stabilization (e.g., applying the hot-melt composition to an absorbent core to increase its strength).

[0119] Hot-melt adhesive compositions can be used for construction applications. In a typical construction application in the manufacture of disposable absorbent articles, a fluid-impermeable sheet is bonded to a nonwoven substrate. Hot-melt adhesive compositions can also be used to bond at least one additional layer or material selected from the group consisting of absorbents, tissues, elastomers, superabsorbent polymers, and combinations thereof. For example, the adhesive can also be used for sheet lamination, where a fluid-impermeable sheet, typically a membrane (e.g., polyethylene, polypropylene, ethylene vinyl acetate, ethylene copolymers, bio-based, etc.), is bonded to a second nonwoven material to improve the feel of the disposable article.

[0120] Hot melt adhesive compositions can be used as positioning adhesives. The positioning adhesive is disposed on at least one base surface of a disposable absorbent article and can be used to position the absorbent article onto clothing such as underwear. Such disposable absorbent articles include, for example, feminine hygiene products such as sanitary napkins and panty liners, diapers, disposable garments with waist and leg openings, and adult incontinence products. In one construction, the absorbent article (e.g., a feminine hygiene product) includes a garment-facing surface and a body-facing surface, a top sheet having both garment-facing and body-facing surfaces, a bottom sheet having both garment-facing and body-facing surfaces, and an absorbent core disposed between the body-facing surface of the bottom sheet and the garment-facing surface of the top sheet. Pressure-sensitive adhesive compositions are disposed on the garment-facing surface of the absorbent article, typically or even on the garment-facing surface of the bottom sheet. Release pads are optionally disposed on the pressure-sensitive hot melt adhesive composition to protect the pressure-sensitive adhesive composition until use. The absorbent article (e.g., a feminine hygiene product) optionally includes an additional layer and adhesive, and components of the absorbent article optionally exhibit additional functionality. Examples of add-on layers, functionalities, and combinations thereof include dust removal, wicking, collection, add-on top sheets, multiple wicking layers, superabsorbent particles and compositions, wetting indicator marks, and combinations thereof.

[0121] The present invention will now be described by way of the following embodiments. Unless otherwise specified, all parts, ratios, percentages and amounts mentioned in the embodiments are by weight.

[0122] Example

[0123] Unless otherwise specified, the test procedures used in the embodiments and throughout this specification include the following procedures.

[0124] Brinell viscosity test method

[0125] Viscosities were determined using a Brookfield Thermosel DV12 viscometer and a No. 27 rotor, according to ASTM D-3236, entitled "Standard Test Method for Apparent Viscosity of Adhesives and Coating Materials" (October 31, 1988). Results were reported in centipoises (cP).

[0126] Glass transition temperature (Tg) test method

[0127] The glass transition temperature (Tg) of the sample was determined using Dynamic Mechanical Analysis (DMA) with a DHR-II instrument under the following conditions: the sample was heated to 150 °C, held at 150 °C for 5 minutes, and cooled to -20 °C at 3 °C / min and 10 radians / second, with a strain of 10%. Tg is the temperature at which the tanδ curve exhibits a local maximum in the material transition region between the glassy and rubbery states, typically between -20 °C and 40 °C.

[0128] Wenping area

[0129] Dynamic mechanical analysis (DMA) with DHR-II instrumentation was used to obtain the temperature plateau range under the following conditions: the sample was heated to 150°C, held at 150°C for 5 minutes, and cooled to -20°C at 3°C / min and 10 radians / second with a strain of 10%.

[0130] As the temperature decreases from 150°C, the storage modulus G' and loss modulus G” increase. The temperature at which these two curves intersect is called the first crossover temperature (T1). This is where the material transitions from a molten state to a stable rubbery state. As the temperature continues to decrease, when the material begins to transition to a glassy state, the G' and G” curves intersect again. This temperature is called the second crossover temperature (T2). T1 and T2 define the temperature plateau range.

[0131] Cycloaliphatic content

[0132] Cycloaliphatic content was obtained using ¹H-NMR spectroscopy. The sum of signals from 1.9 ppm to 2.5 ppm was calculated as a percentage relative to the total aliphatic hydrogen from 0.2 ppm to 3.7 ppm. If antioxidants or other additives were present in the oil sample, their corresponding resonances were omitted from the defined integration region.

[0133] Molded Gardner Color

[0134] The adhesive was tested (in the molten state) to determine the Gardner color by comparing the color of the sample to the Gardner color standard as described in ASTM D-1544. This comparison was performed using a Gardner Delta comparator equipped with lighting, available from Pacific Scientific (Bethesda, Maryland).

[0135] Sample preparation method for dynamic peel force test

[0136] A 1-inch (25.4 mm) wide slotted coating applicator and laminator were set to an application temperature of 149°C, a roll gap pressure of 103.4 kPa (15 psi), and minimal rewind and unwind tension to avoid stretching the film. A hot-melt adhesive composition was continuously applied at a coating weight of 3 g / m² to an embossed, airtight, layered polyethylene film with a thickness of 0.9 mils (0.023 mm), and laminated with an oriented polypropylene nonwoven web with a thickness of 4 mils (0.1 mm) and a basis weight of 0.45 oz / yd² (15.3 g / m²) at a speed of approximately 184 m / min.

[0137] Dynamic peel force test method

[0138] Dynamic peel force was determined according to ASTM D1876-01, entitled "Test Method for Determining Peel Resistance of Adhesive (T-Peel Test Method)," but with the difference of running the test at 30.5 cm / min (12 in / min) over a 10-second time period, repeated 6 times. The sample was run on an IMASS Spec type testing instrument. The sample was peeled along the machine coating direction. The average peel value over 10 seconds was recorded, and the result was reported in grams. The initial dynamic peel force value was measured 24 hours after sample preparation. The test was repeated six times, and the average value was reported in grams per 25 mm (gf / 25 mm).

[0139] Sample preparation method for cotton peel strength testing

[0140] The laminate was prepared by applying the sample composition in a one-inch wide pattern onto a silicone-coated release paper at an additional weight of 20 g / m² (+ / - 3 g / m²) using a slot applicator. The adhesive strip was then brought into contact with the treated side of a 0.9 mil (0.023 mm) thick polyethylene film to form a silicone-coated release paper / adhesive / polyethylene film laminate. A test sample was then cut from the laminate with a length of 4 inches (10.16 cm) in the machine coating direction and a length of 2 inches (5.08 cm) in the machine transverse direction, with the adhesive pattern centered in the machine transverse direction of the test sample.

[0141] Cotton peel strength test method

[0142] For the cotton bonded section, a sheet of 124 g / m² bleached T-shirt cotton fabric from Testfabrics, Inc. (West Pittston, Pennsylvania) was cut into strips 4 in (10.16 cm) long in the machine direction and 1.5 in (3.81 cm) wide in the machine transverse direction. The cotton fabric was then cut, and the stitching grid pattern was examined. When the cotton fabric was stretched, the sample exhibited a greater elongation in one direction than in the other. The cotton fabric was cut longitudinally in the direction with the smaller elongation. All cotton fabric strips were cut as straight as possible along the stitching grid pattern. If the cotton fabric strips were cut at an angle, it would result in inconsistent elongation of the cotton fabric test sample.

[0143] Remove the release film from the adhesive and gently place the adhesive side of each test sample onto the surface of the cotton swab, causing the cotton to curl away from the adhesive bonding area to form a composite test sample. Take care not to press the adhesive down onto the test fabric. That is, use a material that adheres more easily to the side of the cotton fabric in the peel strength test.

[0144] The resulting test sample was then placed on a mechanical drop device equipped with a 4.5-pound roller, and the roller passed over the sample twice at a rate of approximately 12 in / min (305 mm / min), once forward and once backward, once in each longitudinal direction, to ensure that the sample was free of entrained air bubbles.

[0145] Then start the timer and place the sample in the fixture of the INSTRON type peel force tester. Place the polyethylene film in the moving fixture and attach the fabric to the fixed fixture. Within one minute of removing the sample from the rolling device, test the sample according to ASTM D1876-01, entitled "Test Method for Determining Peel Resistance of Adhesive (T-Peel Test Method)," except that the test is run at a rate of 305 mm / min instead of 250 mm / min for a ten-second time period, and at least five repetitions are performed instead of the ten repetitions specified in ASTM D1876. Record the average peel force over the ten seconds, and report the results in grams.

[0146] The initial peel force was measured 24 hours after the test sample was prepared.

[0147] The following grades of styrene block copolymers were used in the examples.

[0148] JH8151-SIS, 16% wt% styrene, MFR = 10 (200℃, 5kg)

[0149] KIBITON PB 5502-SBS, 36.5% wt% styrene, MFR = 8 (190°C, 2.16 kg)

[0150] VECTOR 4211-SIS, 30% wt% styrene, MFR = 13 (200°C, 2.16 kg)

[0151] GLOBALPRENE 3546-SBS, 40% styrene, MFR = 6 (200℃, 216kg)

[0152] STYROFLEX 2G66-S-TPE-S, 64% styrene, MFR = 11 (200℃, 5kg)

[0153] Table 1

[0154]

[0155]

[0156] Table 2

[0157]

[0158]

[0159] *Exceeds the instrument's low temperature limit

[0160] Table 3

[0161] Example 6 Example 7 Example 8 Example 10 JH8151 10 8 10 KIBITON PB5502 12 12 VECTOR 4211 6 GLOBALPRENE 3546 19 STYROFLEX 2G66 10 Average styrene content 27.3 28.3 40 37.6 SYLVALITE RE 100L 61 SYLVALITE 9100 55 60 59.5 antioxidants 1 1 1 1 Co-extruded coatings 0.5 0.5 0.5 0.5 Packaging film 0.5 0.5 0.5 0.5 GTL SARAWAX SX105 0.5 VIVASPES10227 21 18 18 12 Brinell viscosity (cP) at 149℃ 4250 3650 7100 10150 Temperature range (°C) 8-81(73) 22-76(54) 22-63(41) 24-83(59) Environmentally friendly components (wt%) 76 78 77.5 73 Bio-based components (wt%) 76 78 77.5 73 Glass transition temperature (°C) -15 -5 -1 8 Peel adhesion to cotton (g / in) 322 451 283 NT Dynamic peel adhesion force (g / in) NT NT NT 116

[0162] NT (Untested)

[0163] The adhesive composition was prepared by combining and mixing the components in a Sigma-type paddle mixer operated at 177°C in the percentages described in Tables 1, 2 and 3.

Claims

1. A hot melt adhesive composition, said hot melt adhesive composition comprising: a. 5% to 50% by weight of thermoplastic polymers, b. 10% to 80% by weight of a bio-based tackifier, wherein the bio-based tackifier is selected from the group consisting of rosin-based tackifiers and terpene-based tackifiers, and c. 2% to 50% by weight of an environmentally friendly aliphatic plasticizer, said environmentally friendly aliphatic plasticizer having the effect of... 1 The content of cyclic aliphatic plasticizers, measured by H-NMR spectroscopy, is no more than 2% by weight, and the aliphatic plasticizer is selected from the group consisting of straight-chain alkanes, branched alkanes, or combinations thereof.

2. The hot melt adhesive composition according to claim 1, wherein the environmentally friendly aliphatic plasticizer is a bio-based aliphatic plasticizer.

3. The hot melt adhesive composition according to claim 1, wherein the thermoplastic polymer is selected from the group consisting of olefin polymers, styrene block copolymers, their functionalized forms, and combinations thereof.

4. The hot melt adhesive composition according to claim 2, wherein the thermoplastic polymer is selected from the group consisting of olefin polymers, styrene block copolymers, their functionalized forms, and combinations thereof.

5. The hot melt adhesive composition according to claim 1, wherein the hot melt adhesive composition has an environmentally friendly component content of 65% to 100% by weight.

6. The hot melt adhesive composition according to claim 2, wherein the hot melt adhesive composition has a bio-based component content of 65% to 100% by weight.

7. The hot melt adhesive composition of claim 2, wherein the bio-based aliphatic plasticizer is derived from vegetable oil.

8. The hot melt adhesive composition according to claim 2, wherein the bio-based aliphatic plasticizer is a hydrogenation product of octadecane and hexadecane.

9. The hot melt adhesive composition of claim 2, wherein 100% by weight of the bio-based aliphatic plasticizer is produced or derived from renewable resources.

10. The hot melt adhesive composition according to claim 2, wherein the bio-based aliphatic plasticizer has the effect of... 1 The content of cycloaliphatic compounds measured by H-NMR spectroscopy is no more than 0.5% by weight.

11. The hot melt adhesive composition according to any one of claims 1 to 10, wherein the bio-based tackifier is selected from the group consisting of: terpenes, styrene-modified terpenes, phenol-modified terpenes, carboxylic acid-modified terpenes, maleic anhydride-modified terpenes, α-pinene, β-pinene, γ-limonene, dipentene, rosin, wood rosin, floating oil rosin, distilled rosin, hydrogenated rosin, dimer rosin, polymerized rosin, glycerol esters of light-colored wood rosin, glycerol esters of hydrogenated rosin, glycerol esters of polymerized rosin, pentaerythritol esters of natural rosin, pentaerythritol esters of light-colored wood rosin, pentaerythritol esters of hydrogenated rosin, pentaerythritol esters of tall oil rosin, and phenol-modified pentaerythritol esters of rosin.

12. The hot melt adhesive composition according to any one of claims 1 to 10, wherein the thermoplastic polymer is a styrene block copolymer.

13. The hot melt adhesive composition of claim 11, wherein the thermoplastic polymer is a styrene block copolymer.

14. The hot melt adhesive composition according to claim 2, wherein the hot melt adhesive composition comprises: a. 10% to 40% by weight of the thermoplastic polymer, wherein the thermoplastic polymer comprises a styrene block copolymer. b. 15% to 75% by weight of the aforementioned bio-based thickener, and c. 5% to 40% by weight of the bio-based aliphatic plasticizer.

15. An article comprising a hot melt adhesive composition, said article being selected from the group consisting of tapes, labels, and disposable absorbent articles comprising the hot melt adhesive composition according to any one of claims 1 to 14.

16. A disposable absorbent article, the disposable absorbent article comprising: a.) First basement, b.) The second basement, and c.) The hot melt adhesive composition according to any one of claims 1 to 14, The hot melt adhesive composition is disposed on at least one of the first substrate and the second substrate.

17. The disposable absorbent article of claim 16, wherein at least one of the substrates is bio-based.

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