Pen with PLA / PBS shaft base material

Abstract

pencil (1) with a lead (2) and a shaft (3), wherein the lead (2) is arranged in the shaft (3) in a manner that prevents displacement, wherein the shaft (3) has a shaft base material, the shaft base material comprising the following components: 60 to 75% by weight Filler(s) 15 to 30 wt.% Binder mixture comprising PLA and a second binder selected from the group consisting of PBS, PBS copolymers, in particular PBSA, 0.2 to 6 wt.% other additives such as adhesion promoters, stabilizers, 1 to 10 wt% wax / e, 0 to 4 wt.% Colorants, especially pigments, wherein the other additives comprise the adhesion promoter and wherein the adhesion promoter is selected from the group comprising MAH-grafted PBS, MAH-grafted PBSA or mixtures from the group comprising MAH-grafted PLA, MAH-grafted PBS and MAH-grafted PBSA.

Description

[0001] The invention relates to a pen having the features of the preamble of claim 1.

[0002] Pencils with wooden shafts have been around for a long time. Wood prices have risen in recent years, increasing manufacturing costs. Therefore, manufacturing processes have been developed that encapsulate the lead with polymers by extrusion. Polystyrene (PS), for example, is used as the base polymer for the shaft material. Polystyrene has the advantage of being readily available, easy to process, and the resulting shaft offers good mechanical properties. Polystyrene has the disadvantage of not being biodegradable.

[0003] Against this background, the document DE 10 2008 034 013 B4 proposes the use of a wood substitute for the shaft of a pencil, whereby the wood substitute is based on a polymeric binder.

[0004] Such an extruded pencil is also known, for example, from EP 0 505 262 B1, which represents the closest prior art. The pencil described therein consists of foamed polystyrene in the casing and a flexible polystyrene-bonded lead.

[0005] The document US 2021 / 0394549 A1 discloses a shaft for a pen with 5 to 50% filler and a binder made of a mixture of PLA and PBS.

[0006] It is an object of the present invention to propose a pencil that represents a sustainable alternative to the prior art, while simultaneously retaining the pencil's performance characteristics, in particular its sharpenability and flexural strength. This object is achieved by a pencil having the features of claim 1. Preferred or advantageous embodiments of the invention are evident from the subclaims, the following description, and the accompanying figure.

[0007] The subject matter of the invention is a pen, wherein the pen has a lead and a shaft, wherein the shaft preferably surrounds the lead concentrically and / or coaxially and wherein the lead and the shaft are arranged so as to be non-displaceable and / or non-displaceable relative to one another. In particular, the lead is permanently and irreversibly fixed in the shaft and / or cannot be removed without destruction. For example, the lead is optionally connected to the shaft via intermediate layers in a material-to-material, force-to-fit and / or form-fitting manner. The shaft is arranged around the lead. It serves to store and protect the lead and has a larger diameter than the lead. This enables the fingers to hold the shaft and guide the pen easily. The shaft comprises a material called the shaft base material. Further layers, e.g. decorative layers, can be arranged on the shaft base material.

[0008] The pin is designed, in particular, as a straight cylinder, whereby the cylinder base or cross-sectional area can be round, oval, triangular, quadrangular, pentagonal, hexagonal, or polygonal, for example. Alternatively, the pin can be twisted or flexed.

[0009] The pencil is particularly designed to be sharpenable. For example, it can be sharpened with a pencil sharpener, such as a colored pencil sharpener, pencil sharpener, machine sharpener, or cosmetic pencil sharpener. A conical tip can be created or reworked by removing material from the shaft and the lead. A pencil is described as sharpenable if a person can manually remove material from the pencil with a blade in a housing and with moderate force, creating the conical tip.

[0010] The shaft comprises a shaft base material, wherein the shaft preferably consists of at least 60 wt.%, preferably at least 80 wt.%, and in particular at least 98 wt.% or even 100 wt.% of the shaft base material. Alternatively or additionally, the cross-sectional area of ​​the shaft preferably comprises the shaft base material at least 80% of the cross-sectional area, preferably at least 90% of the cross-sectional area, and in particular at least 98% of the cross-sectional area or even 100% of the cross-sectional area.

[0011] In particular, the shaft comprises a shaft body made of the shaft base material. The shaft body has a ring-shaped cross-section, for example, a circular ring. In particular, the inner contour can be circular and / or the outer contour can be any shape, e.g., round, oval, triangular, quadrangular, pentagonal, hexagonal, or polygonal.

[0012] Within the scope of the invention, it is proposed that the shaft base material comprises the following components based on the shaft base material, in particular on the total weight of the shaft base material: The shaft base material has the following components: 60 to 75 wt.% Filler(s) 15 to 30 wt.% Binder mixture comprising PLA and a second Binder selected from the group consisting of PBS, co-polymers of PBS, especially PBSA, is selected 0.2 to 6 wt.% other additives such as adhesion promoters, stabilizers 1 to 10 wt.% Wax / s 0 to 4 wt.% Colorant, especially as pigment.

[0013] In particular, the base material of the shaft has a filler content of more than 60 wt.%, which corresponds to a high proportion. The base material of the shaft can also contain a mixture of several fillers. The base material of the shaft contains 60 to 75 wt.% of the filler alone or of the filler mixture. It is possible to select this from biodegradable material. Furthermore, the filler content can reduce costs, as the filler reduces the use of binding agents.

[0014] In particular, the base material of the shaft contains no chemical additives that release gas through thermal decomposition, nor is the melt physically foamed during extrusion by introducing gas. The base material of the shaft is preferably unfoamed. However, very slight blistering in the base material of the shaft cannot be ruled out at the process temperatures used due to volatile components of the respective raw materials.

[0015] The filler content also has the particular advantage that the shaft is not flexible and thus stiff, brittle, high-quality leads are stored in a break-proof manner by the shaft base material.

[0016] Furthermore, the shaft base material contains a binder mixture of PLA and at least one second binder. PLA also includes, in particular, PLA blends or PLA compounds. PLA stands for polylactic acid, which can be referred to specifically as polylactide and / or polylactic acid. PLA is specifically registered with the Chemical Abstracts Service under the number CAS: 9051-89-2. Depending on the number of monomers in the polymer, the properties of PLA as a polymer can vary slightly.

[0017] PLA is a thermoplastic. PLA has the advantage of being bio-based, significantly reducing or completely eliminating the use of petroleum-based raw materials in the pen. PLA, for example, is derived from corn and, as a synthetic polymer, belongs to the polyester family. Thus, pure PLA is preferably made from renewable resources and is not based on fossil fuels such as petroleum.

[0018] Furthermore, PLA is compostable and can be broken down into harmless end products within a reasonable period of time, e.g., less than 12 weeks, particularly in an industrial composting facility, in accordance with the EN 14995 or EN 13432 standards, although other similar standards may specify different conditions and time periods. Composting or degrading PLA requires industrial composting conditions, i.e., controlled temperature and humidity conditions in the presence of microorganisms. For example, temperatures must be between 55 and 70°C. Through industrial composting, it is possible to break down the pencil barrel into harmless end products, according to the standard, and to designate them as biodegradable.

[0019] The PLA-based binder mixture comprises at least one second binder as a second component, which is selected from the group consisting of PBS and PBS copolymers, in particular PBSA. PBS stands for polybutylene succinate (e.g., CAS: 25777-14-4). PBSA stands for poly(butylene succinate-co-butylene adipate) (e.g., CAS: 67423-06-7). Depending on the number of monomers in the polymer, the properties of the polymer can vary slightly. PBS and PBSA are more biodegradable than PLA. Both also exhibit thermoplastic properties. The starting materials for polymerization can be produced from glucose or fructose. This means that PBS and PBSA can be produced biobased.

[0020] The shaft base material also contains other additives. The group of other additives includes adhesion promoters and optionally additional stabilizers and others. Adhesion promoters are used to improve the adhesion of the fillers to the binder mixture. They can also be used to improve the adhesion of the lead to the shaft base material. An adhesion promoter according to the invention would be a maleic anhydride-grafted polymer selected from the group of polyesters, including PBS and PBSA.

[0021] Stabilizers are added to slow the polymer's aging processes. Exposure to heat, light, ozone, and oxygen can lead to aging processes, which become apparent in the deterioration of properties, for example, as color changes.

[0022] Furthermore, the shaft base material comprises at least one wax. The shaft base material can also comprise a mixture of several waxes. The shaft base material comprises 1 to 10 wt.% of the wax alone or of the mixture of waxes. In particular, the wax serves to adjust the extrusion properties, e.g., to improve flow behavior and / or adjust the sharpenability. In particular, easier material removal from the shaft and lead is achieved so that a conical tip of the pencil can be created. The wax can serve as an extrusion aid (improving flow properties, reducing melt wall adhesion to machine and / or tool parts), but can also have a positive influence on the material structure with regard to its mechanical, machinability. This is particularly important when the user manually sharpens the pencil using a sharpener.

[0023] In particular, the at least one wax has a melting point such that it is present as a liquid in the extruder and can influence the flow behavior of the melt and / or the heated shaft base material.

[0024] Furthermore, the base material of the shaft preferably contains colorants. These are used, in particular, to lighten the color of the base material. For lightening the color, it has proven advantageous to use a white pigment, e.g., made of titanium dioxide (TiO2).

[0025] The proposed composition of the shaft base material allows the production of a shaft that exhibits the necessary properties for pencils: sharpenability, grip, mechanical, thermal, and chemical stability. The binder mixture thus represents a sustainable alternative to the base polymers previously used for the production of pencil shafts.

[0026] A particularly advantageous aspect of the choice of binder mixture has been shown to be that, especially compared to other plastics, the original properties, such as sharpenability, fracture strength, and haptic properties, are not adversely affected by the state-of-the-art polymers. This makes the binder mixture a fully functional, sustainable substitute for the previously known polymers.

[0027] In a preferred embodiment of the filler, it is selected from a group comprising wood flour, wood fibers, and / or cellulose. One form of wood flour is called lignocellulose. Lignocellulose contains the lignin of wood within the cellulose. Lignocellulose can be produced from wood through mechanical comminution, particularly as groundwood, compressed air, wood chips, etc. These fillers are bio-based and / or biodegradable and inexpensively available.

[0028] In particular, the filler may contain other substances in addition to wood flour, wood fibers and / or cellulose.

[0029] In another embodiment, the base material of the shaft contains a mixture of fillers. In particular, a mixture of organic fillers with additional organic and / or inorganic substances, e.g., talc, chalk, kaolin, etc., is possible.

[0030] In one embodiment, the filler(s) is / are at least largely or entirely organic. Thus, the filler(s) may consist entirely of wood flour, wood fibers, cellulose, and mixtures thereof to be considered entirely organic.

[0031] In a further embodiment, in addition to the organic fillers such as wood flour, wood fibers, and / or cellulose, other inorganic fillers can be present as a mixture with the organic fillers. The inorganic fillers are present in the filler mixture in a range from greater than 0 to 10 wt.% based on the filler weight. The organic filler is present predominantly in the filler mixture at greater than or equal to 90 wt.% based on the filler weight. Thus, the filler or fillers are predominantly organic.

[0032] In a further embodiment, the shaft base material comprises a filler content in the range of 60 to 75 wt.%, preferably in the range of 68 to 73 wt.%, based on the shaft base material. This allows for a high filler content.

[0033] In a first possible alternative, the binder mixture comprises PLA, the second binder, and additional binders. In a second possible alternative, the binder mixture consists or essentially consists of PLA and the second binder.

[0034] In another embodiment, the binder mixture is selected in a range of 17 to 27 wt.%, preferably in a range of 19 to 23 wt.%, based on the shaft base material. The binder content is selected in particular to achieve an adjustment of the flexural strength and the modulus of elasticity, in order to securely mount a stiff, brittle, but high-quality lead in the shaft base material. This has the advantage of optimizing the shaft base material's mechanical properties.

[0035] In a preferred embodiment, the binder mixture contains only the second binder in addition to the PLA. Alternatively or additionally, the binder mixture consists of the PLA and the second binder, or the binder mixture consists essentially of the PLA and the second binder. The PLA is present in a weight ratio to the second binder in the range of 10:1 to 1:10.

[0036] This has the advantage that the properties of the PLA compound can be modified by the second binder in the binder mixture. Biodegradability can be increased by adding PBS or PBSA. Mechanical and / or elastic properties can be optimized. Raw material costs can be optimized.

[0037] According to the invention, the other additives comprise an adhesion promoter, which improves the adhesion between the filler and the binder mixture.

[0038] According to the invention, the adhesion promoter comprises a polymer grafted with MAH selected from the group of polyesters comprising PBS, PBSA, or mixtures selected from the group comprising MAH-grafted PLA, MAH-grafted PBS, and MAH-grafted PBSA. MAH stands for maleic anhydride, which in particular also stands for maleic anhydride (CAS: 108-31-6). MAH-grafted PLA can in particular be referred to as maleic anhydride-grafted polylactide and / or maleic anhydride-grafted polylactic acid.

[0039] MAH-grafted PBS can specifically be referred to as maleic anhydride-grafted polybutylene succinate. MAH-grafted PBSA can specifically be referred to as maleic anhydride-grafted poly(butylene succinate-co-butylene adipate). In one embodiment, the adhesion promoter comprises a mixture of MAH-grafted PLA, MAH-grafted PBS, and MAH-grafted PBSA. The mixture of MAH-grafted PLA, MAH-grafted PBS, and MAH-grafted PBSA can be present in various ratios. The MAH content in the adhesion promoter allows it to react with the filler via esterification of the OH groups, while also allowing it to integrate compatibly into the primary polymer matrix due to the similar base polymer.

[0040] In a preferred embodiment, the shaft base material has a coupling agent content in the range of 0.2 to 6 wt.%, preferably in the range of 1 to 3 wt.%, based on the shaft base material, in particular based on the total weight of the shaft base material. The exact coupling agent content is determined by various factors, including the degree of grafting with MAH and the steric availability of the functional groups.

[0041] In a further embodiment, the at least one wax is suitable for adjusting the extrusion properties and / or the sharpenability of the shaft base material.

[0042] In a preferred embodiment, the at least one wax is selected from a group comprising stearic acid waxes and stearic acid derivatives; palmitic acid waxes and palmitic acid derivatives; silicone waxes; EBS; polyolefin waxes such as oxidized or non-oxidized polyethylene wax and / or oxidized or non-oxidized polypropylene wax; and mixtures thereof. Distearylethylenediamide is, in particular, a name for ethylene bis(stearamide) and / or is known as EBS (CAS: 110-30-5).

[0043] If the properties of a single wax cannot provide a satisfactory operating point with regard to the extrusion properties and the sharpenability of the shaft base material, a mixture of several different waxes is preferably used.

[0044] Preferably, at least one additional comparatively low-melting wax of this type, which improves the sharpening ability, is added to a first such high-melting wax, which improves the extrusion properties.

[0045] The first wax has a melting point, for example, above 100°C. This improves the flow behavior of the melt, allowing the heated shaft base material to flow more easily out of the extruder. The first wax is selected, in particular, from a group comprising EBS, polyolefin waxes such as oxidized or non-oxidized polyethylene wax and / or oxidized or non-oxidized polypropylene wax, and mixtures thereof.

[0046] The additional wax has a melting point below 100°C, for example. This has the advantage of making it easier to sharpen the pencil. The additional wax is selected, in particular, from a group comprising stearic acid waxes and stearic acid derivatives; palmitic acid waxes and palmitic acid derivatives; silicone waxes; and mixtures thereof.

[0047] The proportion of wax(es) is preferably in the range of 1 to 10 wt.%, preferably in the range of 2 to 6 wt.%, based on the total weight of the shaft base material. The waxes can be present as a mixture of at least two waxes. In particular, in a mixture of the first wax and the additional wax, each of these waxes is present in the range of 1 to 5 wt.%, preferably in the range of 2 to 4 wt.%, based on the total weight of the shaft base material.

[0048] In another embodiment, the colorant is present in a range of 0 to 3 wt.%, preferably in a range of 0 to 2 wt.%. The colorant serves to lighten the relatively dark base color of the polymer-filler mixture and impart a uniform and natural color tone. Varying the contents can also compensate for the natural fluctuations of the fillers.

[0049] In a preferred embodiment of the invention, the lead is made from PLA. In particular, the lead contains PLA as a binding agent. The lead is preferably formed from the components described in the document DE 10 2013 016 355 A1, the disclosure of which is incorporated into the description by reference.

[0050] In particular, the mine comprises a mine base material, wherein the mine base material comprises the following components: 10 to 40 % by weight PLA 30 to 80 % by weight Lead filler 0 to 20 % by weight Waxes / Lubricants 0 to 10 % by weight Additives such as plasticizers, stabilizers, Adhesion promoter

[0051] The polylactide content of the lead base material is in the range of 10 to 60 wt.%, preferably in a range of 10 to 40 wt.% and particularly preferably in the range of 10 to 25 wt.%.

[0052] It has proven advantageous if the mine base material 10 to 60 % by weight Polylactide 2 to 25 % by weight wax 15 to 70 % by weight Fillers, especially lead fillers 0 to 5 % by weight Palm oil 0 to 30 % by weight Colorants has.

[0053] In a preferred embodiment of the invention, the shaft base material and the lead base material are directly bonded to one another. In particular, they are bonded together by a material bond. By choosing PLA for the two base materials, an intermediate layer can advantageously be omitted, since these similar polymers can adhere to one another without any additional measures. Thus, by selecting similar base materials, the adhesion promoter layer can be eliminated and a stable bond can be created.

[0054] In particular, the organic components of the mine are also biodegradable under the conditions of industrial biological compostability of PLA or are bio-based, as previously described.

[0055] In a further embodiment, the pen is designed so that it can be used as a writing and / or painting pen and / or as a cosmetic pen.

[0056] Further features, advantages, and effects of the invention will become apparent from the following description of a preferred embodiment of the invention and the accompanying figures. These show: Fig. 1 a schematic representation of a sharpenable pencil

[0057] The Fig.Figure 1 shows a highly schematic block diagram of a pencil 1 with a lead 2 and a shaft 3 made of a shaft base material. The pencil 1 can be sharpened and has a conical area 4 created by a sharpener near the shaft 3 and the lead 2. This exposes the lead 2. The lead 2 is arranged rigidly in the shaft 3. This prevents the lead 2 from slipping. As a result, the lead 2 does not shift into the shaft 3 even when slight pressure is exerted on the pencil 1 while writing. The shaft 3 comprises a material called the shaft base material. Additional layers, such as decorative layers, can be arranged on the shaft base material.

[0058] The shaft base material has the following components: 60 to 75 wt.% Filler(s) 15 to 30 wt.% Binder mixture comprising PLA and a second binder selected from the group consisting of PBS, co-polymers of PBS, in particular PBSA, 0.2 to 6 wt.% other additives such as adhesion promoters, stabilizers 1 to 10 wt.% Wax / s 0 to 4 wt.% Colorant, especially as pigment.

[0059] Examples of shaft base materials are shown below.

[0060] The production of a shaft according to the invention preferably takes place after mixing and granulating the components of the shaft base material in the extrusion process or coextrusion process as a coating of the provided lead at approximately 150 to 200°C.

[0061] The shape of the cross-sectional area is adjusted in the extrusion head. After cooling, the pin strand is cut to a specific length.

[0062] Preferably, the wood flour, wood fibers, and / or cellulose are in the form of particles. The particles preferably have an average particle size, which can be expressed as d50 in µm. The designation d50 = 150 µm means that 50% of the particles are smaller than 150 µm and 50% are larger. The particle size distribution can be determined, for example, using a laser granulometer.

[0063] Example 1 (not according to the invention) Paint pencil with shaft base material has the following components: 73% by weight Wood flour (d50 approx. 100 µm) as filler 10 wt.% PLA (polylactide, polylactic acid, polylactic acid) in the binder mixture 10 wt.% PBS (polybutylene succinate) in the binder mixture 1 wt.% MAH grafted PLA (maleic anhydride grafted polylactide, maleic anhydride grafted polylactic acid) as other additives especially adhesion promoters 3 wt.% Stearic acid derivative wax in waxing agent 2 wt.% EBS (distearyl ethylene diamide) in the wax 1 wt.% Titanium dioxide as a colorant, especially as a pigment.

[0064] The advantage is the high filler content, which allows a largely biodegradable pen shaft to be produced.

[0065] Example 2 Writing pen with shaft base material has the following components: 61.5% by weight Wood flour (d50 approx. 35 µm) as filler 10 wt.% PLA (polylactide, polylactic acid, polylactic acid) in the binder mixture 20 wt.% PBS (polybutylene succinate) in the binder mixture 1.5 wt.% MAH grafted PBS (maleic anhydride grafted polybutylene succinate) as other additives especially adhesion promoters 1.5 wt.% Stearic acid derivative wax in waxing agent 3.5 wt.% EBS (distearyl ethylene diamide) in the wax 2 wt.% Titanium dioxide as a colorant, especially as a pigment.

[0066] The advantage is the high filler content in combination with biodegradable binders, which allows a largely biodegradable shaft of a pen to be produced.

[0067] Example 3 (not according to the invention) Writing pen with shaft base material has the following components: 60.5 wt% Wood flour (d50 approx. 70 µm) as filler 25 wt.% PLA (polylactide, polylactic acid, polylactic acid) in the binder mixture 5 wt.% PBS (polybutylene succinate) in the binder mixture 6 wt.% MAH grafted PLA (maleic anhydride grafted polylactide, maleic anhydride grafted polylactic acid) as other additives especially adhesion promoters 1 wt.% Stearic acid derivative wax in waxing agent 1.5 wt.% EBS (distearyl ethylene diamide) in the wax 1 wt.% Titanium dioxide as a colorant, especially as a pigment.

[0068] The advantage is the high filler content combined with a biodegradable binder, which allows for the production of a largely biodegradable pencil shaft. The bonding agent enables greater stability.

[0069] Example 4 Writing pen with shaft base material has the following components: 71.5% by weight Cellulose as a filler 2 wt.% PLA (polylactide, polylactic acid, polylactic acid) in the binder mixture 20 wt.% PBSA (Poly(butylene succinate-co-butylene adipate)) in the binder mixture 2 wt.% MAH grafted PBSA (maleic anhydride grafted poly(butylene succinate-co-butylene adipate)) as other additives especially adhesion promoters 2 wt.% Stearic acid derivative wax in waxing agent 2 wt.% EBS (distearyl ethylene diamide) in the wax 0.5 wt.% Titanium dioxide as a colorant, especially as a pigment.

[0070] Example 5 Black cosmetic pencil with barrel base material has the following components: 69% by weight Wood flour (d50 100 µm) as filler 10 wt.% PLA (polylactide, polylactic acid, polylactic acid) in the binder mixture 15 wt.% PBS (polybutylene succinate) in the binder mixture 1.5 wt.% Mixture 1:1 MAH grafted PLA (maleic anhydride grafted polylactide, Maleic anhydride grafted polylactic acid) : MAH grafted PBS (maleic anhydride grafted polybutylene succinate) as other additives especially adhesion promoter 1 wt.% Stearic acid derivative wax in waxing agent 2.5 wt.% EBS (distearyl ethylene diamide) in the wax 1 wt.% Carbon black as a colorant, especially as a pigment.

[0071] Example 6 Writing pen with shaft base material has the following components: 66% by weight Cellulose as a filler 8 wt.% PLA (polylactide, polylactic acid, polylactic acid) in Binder mixture 15 wt.% PBSA (Poly(butylene succinate-co-butylene adipate)) im Binder mixture 5 wt.% MAH grafted PBSA (maleic anhydride grafted Poly(butylene succinate-co-butylene adipate)) as other additives especially adhesion promoters 3 wt.% Stearic acid derivative wax in waxing agent 2 wt.% EBS (distearyl ethylene diamide) in the wax 1 wt.% Titanium dioxide as a colorant, especially as a pigment.

[0072] These examples can be used to produce upper base materials with a high proportion of biodegradable filler. Additionally, bio-based, compostable binders are used.

[0073] The pen with one of the preceding examples as the shaft base material is intended for the writing pen, painting pen and cosmetic pen product lines. List of reference symbols 1 pen 2 mines 3 shaft 4 conical area

Claims

[1] Pen (1) with a lead (2) and a shaft (3), wherein the lead (2) is arranged in the shaft (3) in a displacement-proof manner, wherein the shaft (3) has a shaft base material, wherein the shaft base material comprises the following components: 60 to 75 wt.% Filler(s) 15 to 30 wt.% Binder mixture comprising PLA and a second binder selected from the group consisting of PBS, co-polymers of PBS, in particular PBSA, 0.2 to 6 wt.% other additives such as adhesion promoters, stabilizers, 1 to 10 wt.% wax(es), 0 to 4 wt.% Colorants, especially pigments, wherein the other additives comprise the adhesion promoter and wherein the adhesion promoter is selected from the group comprising MAH grafted PBS, MAH grafted PBSA or mixtures from the group comprising MAH grafted PLA, MAH grafted PBS and MAH grafted PBSA. [2] Pen (1) according to claim 1 characterized by that the shaft base material is unfoamed. [3] Pen (1) according to claims 1 to 2 characterized by that the filler is at least largely or entirely organic. [4] Pen (1) according to one of the preceding claims characterized by that the filler is selected from a group consisting of wood flour, wood fibers and / or cellulose. [5] Pen (1) according to one of the preceding claims characterized by that the shaft base material comprises 65 to 74 wt.% of filler(s), preferably 67 to 73 wt.% of filler(s). [6] Pen (1) according to one of the preceding claims characterized by that the binder mixture is selected in the range of 15 to 25 wt.% of the shaft base material. [7] Pen (1) according to one of the preceding claims characterized by that in the binder mixture the PLA is present in a weight ratio to the second binder in the range of 10:1 to 1:

10. [8] Pen (1) according to one of the preceding claims, characterized by that the shaft base material comprises a content of the at least one adhesion promoter in the range of 0.2 to 6 wt.%, preferably in the range of 1 to 3 wt.%, based on the shaft base material. [9] Pen (1) according to one of the preceding claims characterized by that the shaft base material comprises 2 to 6 wt.% wax / s. [10] Pen (1) according to one of the preceding claims, characterized by that the waxes comprise a first, higher-melting wax and an additional, comparatively lower-melting wax. [11] Pen (1) according to claim 10, characterized by that in the mixture of the first and the additional wax, the respective waxes are present in the range of 1 to 5 wt.%, preferably in the range of 2 to 4 wt.% based on the shaft base material. [12] Pen (1) according to one of the preceding claims characterized by that the shaft base material comprises the colorant in the range of 0 to 3 wt.%, preferably in the range of 1 to 2 wt.% based on the shaft base material. [13] Pen (1) according to one of the preceding claims, characterized by that it is designed as a writing and / or painting pen and / or as a cosmetic pen.

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