Wood substitute material and its use
The invention relates to a wood substitute material for wood-encased pencils, comprising the following ingredients: 15-3.0% by weight of at least one polymeric binder, 50-80% by weight of at least one organic filler, 0-20% by weight of at least one inorganic filler, 0.5-5% by weight of at least one adhesion promoter, 1-30% by weight of at least one wax, 0-10% by weight of at least one color pigment, and 0-10% by weight of at least one additive, the at least one adhesion promoter forming a chemical bond between the at least one polymeric binder and the at least one organic filler, a ratio of the at least one adhesion promoter and the at least one wax in the range from 1:2 to 1:6 being formed, and the sum of organic and inorganic filler being not more than 80% by weight.
1. A wood substitute material for wood-encased pencils, including the following ingredients:
15 -30% by weight of at least one polymeric binder;
50 -80% by weight of at least one organic filler;
0 -20% by weight of at least one inorganic filler;
0.5 -5% by weight of at least one adhesion promoter;
1 -30% by weight of at least one wax;
0 -10% by weight of at least one colour pigment; and
0 -10% by weight of at least one additive,
Wherein the at least one adhesion promoter forms a chemical bond between the at least one polymeric binder and the at least one organic filler, wherein a ratio of the at least one adhesion promoter to the at least one wax in a range from 1:2.5 to 1:6, in % by weight, being formed, and a sum of organic and inorganic filler being not more than 80% by weight, and wherein the at least one organic filler is formed of filler particles having a maximum particle size of 100 μm.
2. The wood substitute material according to claim 1 , wherein the ratio of the at least one adhesion promoter to the at least one wax is formed in the range from 1:2.5 to 1:4.5.
3. The wood substitute material according to claim 1 , including
20- 25% by weight of at least one polymeric binder,
65- 75% by weight of at least one organic filler,
1- 5% by weight of at least one inorganic filler,
1- 2% by weight of at least one adhesion promoter,
2- 12% by weight of at least one wax,
1- 4% by weight of at least one colour pigment, and
0- 5% by weight of at least one additive.
4. The wood substitute material according to claim 1 , wherein the at least one wax is selected from the group of waxes consisting of amide waxes, fatty acids, montanic wax, stearates, fatty acid esters and paraffin wax.
5. The wood substitute material according to claim 4 , wherein the fatty acids are stearic acid or palmitic acid.
6. The wood substitute material according to claim 4 , wherein the at least one wax is formed of amide wax and/or stearic acid.
7. The wood substitute material according to claim 6 , wherein the at least one wax is formed of a combination of amide wax and stearic acid, a ratio of amide wax to stearic acid lying in a range from 1:0.5 to 1:2.
8. The wood substitute material according to claim 1 , wherein the at least one polymeric binder is selected from the group of polyolefins.
9. The wood substitute material according to claim 8 , wherein the at least one polymeric binder is formed of polyethylene (PE) and/or polypropylene (PP).
10. The wood substitute material according to claim 9 , wherein the at least one polymeric binder is formed of polyethylene high-density (PEHD).
11. The wood substitute material according to claim 8 , wherein the at least one adhesion promoter is formed by a polyethylene (PE) with grafted maleic anhydride.
12. The wood substitute material according to claim 8 , wherein the at least one adhesion promoter is formed by a polypropylene (PP) with grafted maleic anhydride.
13. The wood substitute material according to claim 8 , wherein the at least one adhesion promoter is formed by an ethylene maleic anhydride copolymer with maleic anhydride-grafted metallocene polyethylene wax.
14. The wood substitute material according to claim 1 , wherein the at least one organic filler is formed of wood and/or cellulose.
15. The wood substitute material according to claim 1 , further including 1 to 3% by weight of white colour pigment.
16. The wood substitute material according to claim 15 , wherein the white colour pigment is formed of titanium dioxide (TiO 2 ).
17. The wood substitute material according to claim 1 , further including 0.1 to 5% by weight of coloured colour pigment.
18. The wood substitute material according to claim 1 , wherein the at least one inorganic filler is selected from the group of fillers consisting of layer-lattice silicates, calcium sulphate, calcium carbonate, boron nitride, soapstone and graphite.
19. The wood substitute material according to claim 1 , wherein the at least one additive is selected from the group of additives consisting of lubricants, plasticizers, surface-active substances, heat stabilizers and UV stabilizers.
20. A method for producing encased pencils using a wood substitute material according to claim 1 , the method comprising the steps of: providing a colour-releasing lead; and sheathing the lead with the wood substitute material.
21. A method for producing encased pencils using a wood substitute material according to claim 1 , the method comprising the steps of: providing a lead made of an eraser material; and sheathing the lead with the wood substitute material.
22. The method according to claim 20 , wherein the sheathing is formed from the wood substitute material by extrusion.