METHOD FOR PRODUCING A MOLDING COMPOUND

Abstract

A method for producing molding compounds, at least including a binder and a softener, the binder and the softener being in the form of plastisols, the plastisol being essentially composed of PVC and softener, the method of production has the following steps: in a first step, mixing the PVC powder and the amount of softener with optionally other admixtures and/or additives and carrying out the mixing process at a mixing temperature of approximately 55 to 70° C.

Claims

1-6. (canceled)

7. A method for producing a molding compound, including at least a binder and a plasticizer, the binder and the plasticizer being in the form of a plastisol, the plastisol being composed substantially of PVC and plasticizer, the method comprising the steps of: subjecting a PVC powder and an amount of plasticizer with any other supplements and/or additives to a mixing process at a mixing temperature of 55 to 70° C.

8. The method according to claim 7, wherein a plasticizer content is between 32 and 60% by weight.

9. The method according to claim 8, wherein the plasticizer content is between 35 and 55% by weight.

10. The method according to claim 9, wherein the plasticizer content is between 38 and 53% by weight.

11. The method according to claim 7, wherein the plasticizer is formed as a phthalate-free or a phthalate-containing plasticizer.

12. The method according to claim 11, wherein the phthalate-free plasticizer is based on citric acid, adipic acid and/or benzoate ester.

13. The method according to claim 11, wherein the phthalate-free plasticizer is acetyl tributyl citrate, tri(2-ethylhexyl) acetyl citrate, trioctyl citrate, tridecyl citrate, tributyl citrate, trihexyl citrate, triethyl citrate, dioctyl adipate, diisodecyl adipate, diisononyl adipate, diisononyl 1,2-cyclohexanedicarboxylate, acetic acid ester of monoglycerides, benzoates or a mixture of at least two of said substances.

14. The method according to claim 7, wherein the molding compound is composed of at least 20-68% by weight binder 32-60% by weight plasticizer 0-40% by weight filler 0-20% by weight other additives.

Description

[0047] The invention is to be illustrated in more detail using a framework example and some formulation examples using molding compounds.

Framework Example 1 for a Molding Compound

[0048]

TABLE-US-00004 20-68% by weight binder 32-60% by weight plasticizer 0-40% by weight fillers 0-20% by weight other additives

Framework Example 2—Preferred Composition

[0049]

TABLE-US-00005 40-68% by weight binder 35-55% by weight plasticizer 0-20% by weight fillers 0-20% by weight other additives

Framework Example 3—Particularly Preferred Composition

[0050]

TABLE-US-00006 45-63% by weight binder 38-53% by weight plasticizer 0-17% by weight fillers 0-15% by weight other additives

[0051] Stabilizers, co-stabilizers, colorants and/or fillers are examples of other additives that may be used.

Formulation Example 1—Yellow Molding Compound

[0052] 51% by weight E-PVC and S-PVC [0053] 42% by weight plasticizer based on ATBC [0054] 6% by weight stabilizer [0055] 0.5% by weight filler [0056] 0.5% by weight Pigment Yellow 83

Formulation Example 2—Molding Compound, Transparent after Hardening

[0057] 48% by weight E-PVC and S-PVC [0058] 52% by weight plasticizer based on ATBC

[0059] Prior Art—comparison formulation according to DE 10 2005 059 143 [0060] 59% by weight PVC [0061] 24% by weight plasticizer based on citric acid [0062] 1% by weight stabilizers [0063] 7% by weight co-stabilizers [0064] 4% by weight filler [0065] 1% by weight Pigment Red 254

[0066] The preferably used phthalate-free plasticizer is based on citric acid and/or adipic acid.

[0067] A desired consistency of the compound can easily be adjusted by varying the binder content and/or plasticizer content.

[0068] The present invention is to be illustrated in more detail using modeling compounds on the basis of the following tables.

TABLE-US-00007 TABLE 1 Increase in hardness of the unhardened compound as a function of time at 40° C. 30 days/40° C. 90 days/40° C. Composition according to the Delta H 10% Delta H 13% invention Formulation Example 2 Prior art compound Delta H 245% Delta H 386% Comparative example

[0069] It has been shown that the compound that has not yet hardened in the oven according to the application documents compared to the prior art, when stored at 40° C. over time (30 or 90 days), has a significantly lower increase in hardness, as shown in Table 1.

TABLE-US-00008 TABLE 2 Flexibility of the hardened modeling compound Flexibility/deflection to break in mm Composition according to the 28 invention Formulation Example 2 Prior art compound 6 Comparative example

[0070] These higher breaking strengths could be determined and confirmed with a “Texture Analyzer”. Round fracture bars having a length of 10 cm and a diameter of 1 cm are produced as test specimens.

[0071] Molding compounds produced according to the invention are used in automobile construction, household items, medical equipment, toys and the food industry, and also accessories for the aforementioned uses.

[0072] Articles and objects formed with molding compounds produced according to the invention are hardened after shaping by the action of heat.

[0073] The method for producing molding compounds, consisting at least of a binder and a plasticizer, the binder and the plasticizer being in the form of a plastisol, the plastisol being composed substantially of PVC and plasticizer, is carried out by subjecting the PVC powder and the amount of plasticizer with optionally other supplements and/or additives to a mixing process, the mixing process taking place at a mixing temperature of between 55 and 70° C.