Highly Filled Polyolefin Compounds

Abstract

The present invention relates to highly filled polyolefin compounds, the preparation of which uses maleic-anhydride-modified polyolefin and at least one amino-functional silicon compound, and to a process for their preparation, and to their use.

Description

EXAMPLES

Comparative Example

The following typical mixing specification is used for testing:

97 parts of PP (HiFax CA 10A, BASELL)

3 parts of maleic anhydride-modified PP (Exxetor PO 1020; ExxonMobil Chemicals)

183 parts of magnesium hydroxide (Magnifin H7, Albemarle)

Preparation:

The polymer components are processed together with the filler in an extruder to give the compounded material, and test specimens are prepared therefrom, results cf. Table 1.

Inventive Example 1

The following typical mixing specification is used for testing:

97 parts of PP (HiFax CA 10A, BASELL)

3 parts of maleic anhydride-modified PP (Exxetor PO 1020; ExxonMobil Chemicals)

183 parts of magnesium hydroxide (Magnifin H7, Albemarle)

2 parts of N-n-butyl-3-aminopropyltrimethoxysilane (DYNASYLAN® 1189; Degussa)

Preparation:

The filler is coated with the aminosilane in a Lödige mixer. The coating of the filler with the aminosilane takes place at about 60° C. After about 20 minutes of mixing time, the filler is dried at 60° C. and 400 mbar reduced pressure. This gives a white free-flowing powder. The polymer components are then processed together with the aminosilane-coated filler in a twin-screw extruder to give the compound. Strips are produced from a portion of the compound in a single-screw extruder. Test specimens are stamped out from these strips for the tensile tests and water absorption. Flow properties are determined on the compound produced in the twin-screw extruder.

TABLE 1
The following properties were determined on the test specimens
produced in the comparative example and in inventive example 1:
	Test specimen from	Test specimen from
Tests	comparative example	inventive example 1
“Melt flow ratio” to EN	5	25
ISO 1133 [g/10 min]
Tensile strength to EN ISO	9.6	9.5
527 [MPa]
Tensile strain at break to	36	322
EN ISO 527 [%]
Water absorption to EN	0.4478	0.1278
60811-1-3 [mg/cm2]

Claims

1. A highly filled polyolefin compound, comprising a maleic-anhydride-modified polyolefin and at least one amino-functional silicon compound, from the following series:

2. The highly filled compound as claimed in claim 1, the preparation of which is based on starting materials from the following series (i) polypropylene (PP) or polyethylene (PE),(ii) maleic-anhydride-modified polypropylene or maleic-anhydride-modified polyethylene,(iii) filler,(iv) at least one aminosilane and/or aminosiloxane according to a) to f), and(v) where appropriate, stabilizers and processing aids.

3. The highly filled compound as claimed in claim 1, whereinthe proportion of component (ii) is from 0.1 to 10 parts by weight, based on the entire polymer content.

4. The highly filled compound as claimed in claim 1, whereinmetal powders, metal oxides, metal hydroxides, and/or biomaterials are present as fillers.

5. The highly filled compound as claimed in claim 4, whereinmagnesium hydroxide, silicon dioxide, silicates, organoclays, aluminum hydroxide, antimony oxide, calcium carbonate, wood, natural fibers, or biodegradable fillers are present.

6. The highly filled compound as claimed in claim 1, whereinthe filler content is from 30 to 85% by weight, based on the compound.

7. The highly filled compound as claimed in claim 1, whereinthe content of component (iv) is from 0.01 to 5% by weight, based on the compound.

8. (canceled)

9. A process for preparing a polyolefin compound as claimed in claim 1, which comprises(A) combining components (i), (ii), (iii), (iv) and, where appropriate, (v) in a heated mixing assembly with extrusion apparatus, mixing these, extruding the melt, and obtaining pellets, or(B) first coating or mixing component (iii) with component (iv) in a stirred tank, and also combining components (i) and (ii) and also, where appropriate, (v), in a heated mixing assembly with extrusion apparatus, and mixing these, and then adding the mixture of components (iii) and (iv) produced in the reactor to, and incorporating it into, the polymer mixture, extruding the melt, and obtaining the pellets.

10. A polyolefin compound obtained from the process of claim 9.

11. (canceled)

12. A polyolefin molding comprising a highly filled polyolefin compound as claimed in claim 1.

13. A flame-retardant compound for cables comprising a polyolefin compound as claimed in claim 1.

14. (canceled)