EP-4739409-A1 - MODELLING MATERIAL AND METHOD FOR THE PRODUCTION THEREOF

Abstract

The invention relates to a modelling material, at least consisting of a binder which is present as plastisol and at least one filler, as well as optionally further additives, wherein the plastisol is substantially composed of PVC and plasticiser, characterised in that the at least one filler is an organic filler, the at least one organic filler is in the form of flowers and/or petals, and the flowers and/or petals in the modelling material have a longitudinal extent of 1 to 7 mm.

Inventors

• Bauernfeind, Susann
• Liebermann, Kerstin

Assignees

• STAEDTLER SE

Dates

Publication Date

20260513

Application Date

20240702

Claims (8)

1. 1.) Modelling clay, consisting at least of a binding agent, which serves as Plastisol and at least one filler, and possibly other additives, whereby the plastisol consists essentially of PVC and Plasticizer, characterized in that the at least one filler is at least one organic filler, that the at least one organic filler is formed as flower blossoms and/or flower petals and that the flower blossoms and/or flower petals in the modeling mass have a longitudinal extension of 1 to 7 mm.
2. 2.) Mass according to claim 1, characterized in that the mass contains 1-8 wt. %, preferably 1.5-6 wt. %, particularly preferably 2 to 4.5 wt. % of organic fillers in the form of flower blossoms and/or flower petals.
3. 3.) Mass according to claim 1 or 2, characterized in that the flower blossoms and/or flower petals have a residual moisture content of 14%, preferably 11%, particularly preferably 8%.
4. 4.) Mass according to at least one of the preceding claims, characterized in that the flower blossoms and/or flower petals are present as marigold blossoms, sunflower petals, rose petals, cornflowers and/or mallow blossoms.
5. 5.) Mass according to at least one of the preceding claims, characterized in that the mass consists of 45 - 65 wt. % PVC or PVC copolymer 22 - 36 wt. % plasticizer 1 - 8 wt. % organic fillers 0 - 20 wt. % inorganic fillers 0 - 5 wt. % colorant 0 - 5 wt. % other additives.
6. 6.) Mass according to claim 1 or 7, characterized in that the mass contains phthalate-containing and/or phthalate-free plasticizers.
7. 7.) A method for producing a modelling clay according to claim 1, wherein the method for producing the clay is carried out in the following steps: Step 1: Mixing the binder provided with the dried organic fillers in the form of dried flower petals and/or flower blossoms and, if applicable/optionally, stabilizer/co-stabilizer; Step 2: Adding and mixing the plasticizer; Step 3: Mix the composition from the previous steps until the organic fillers have a length/length expansion of 1 to 7 mm;
8. 8.) Method according to claim 7, wherein the method comprises a step 4 for producing a finer surface structure, wherein in step 4, the preceding step 3 is carried out for a longer period and/or is carried out repeatedly, whereby the average length/longitudinal expansion of the organic filler decreases and wherein the longitudinal expansion of the organic filler is a function of the mixing time (t);

Description

Modelling clay and processes for their production Description The invention relates to an oven-hardenable modeling clay and a process for its production. Oven-hardening masses for shaping and modeling objects are known in principle. Modelling materials also include so-called clays or, in the case of polymer-containing materials, polymer clays. For example, DE 25 15 757 C3 and DE 10 2005 059 143 A1 disclose plastic modelling clays that can be shaped by hand and hardened by heating. Such masses essentially consist of binder, filler and plasticizer. The plasticizers are present in phthalate-containing and/or phthalate-free forms, in a content of up to 30% by weight. The disadvantage of the above-mentioned masses is that the surfaces of the modelled products are smooth and usually reflect the surface structure of the processing tool. Furthermore, DE 10 2018 007 756 B4 discloses a plastic mass that has a plastisol made of PVC and plasticizer. The mass also contains plastic fibers as a filler, which are branched, with the fiber length being 0.35 to 0.95 mm. After hardening, these masses have a haptic and optical appearance/structure like leather. It is considered disadvantageous that such masses contain fibers made of plastics to create a visually and haptically perceptible structure, which are not biodegradable. In addition, the optical and haptic structure is predetermined in its degree of expression and cannot be influenced. The object of the invention is therefore to create a modeling or molding compound which does not have the disadvantages mentioned at the beginning and which in particular contains a possible high proportion/content of biodegradable filler which, after the modeling process, automatically, i.e. without the aid of tools and/or other aids, forms a surface structure which is in particular optically and/or haptically perceptible. A further object of the invention is that both optical and haptic effects/surface structures can be created with the modeling clay according to the invention, whereby the degree of the effects/structures can be determined/adjusted by the user himself. This object(s) are solved with the features included in claims 1 and 7. Advantageous embodiments and further developments of the compositions according to the invention are covered by the further claims. This task is carried out by a modeling compound consisting of at least a binding agent, which is in the form of plastisol, and possibly other additives, whereby the plastisol is essentially made up of PVC and plasticizer. The compound also contains at least one filler made of organic fillers. It has been surprisingly shown that by adding organic fillers to modeling clay mixtures, a visually and/or haptically perceptible structured surface design is formed even before the hardening process, which continues to be formed and remains after the hardening process. The organic filler is in the form of flower blossoms and/or flower petals. Examples of flower blossoms and/or petals include marigold blossoms, sunflower petals, rose petals, cornflowers and/or mallow blossoms. In the case of flower blossoms and/or flower petals, it has proven advantageous if they have a length extension of 1 to 7 mm, advantageously 1.5 to 5 mm, in the modelling clay. Length/length extension refers to the greatest extent of the flower blossom and/or petal. Depending on the length/length extension of the flower blossoms and/or petals, the effect of the structures formed on the surface of the modelling clay can be more or less pronounced, from fine to coarse structures/surface structures. It is particularly worth mentioning that, for example, organic fillers in the form of flower blossoms and/or flower petals have a special effect due to the naturally pronounced, differentiated coloring and/or shape design, and thus every modeling clay provided as well as parts/products/objects manufactured/modeled with it are definitely unique. In this way, the proportion of inorganic or synthetically produced colorants can be eliminated, reduced or at least minimized. When making the modeling clay, whole flower blossoms can be added, such as marigold blossoms or rose blossoms. Just the petals of the flower blossoms, such as sunflower petals or rose petals, can also be used. The residual moisture content of the flower petals and/or flower blossoms should not exceed 14%, preferably 11%, particularly preferably 8%, in order to ensure that the organic fillers can be easily broken down during the manufacture of the modeling clay and also during use of the modeling clay by the consumer. A high or higher residual moisture content would make the manufacture/production of the modeling clay more complex, as can be seen from the description of the process for producing the modeling clay. Surprisingly, it has been shown that the residual moisture also influences the processing and/or effect advantages when processing the modeling clay by the user. Irrespective of this, the risk