Binder for injection moulding compositions

Patent metadata

Field	Value
Publication number	US-10047216-B2
Application number	US-201414893857-A
Country	US
Kind code	B2
Filing date	May 23, 2014
Priority date	May 28, 2013
Publication date	Aug 14, 2018
Grant date	Aug 14, 2018

Abstract

The invention also concerns a binder for an injection molding composition including:
from 35 to 54% by volume of a polymeric base, from 40 to 55% by volume of a mixture of waxes, and approximately 10% by volume of a surfactant, wherein the polymeric base contains copolymers of ethylene and methacrylic or acrylic acid, or copolymers of ethylene and vinyl acetate, or copolymers of ethylene including maleic anhydride or a mixture of these copolymers, as well as polyethylene, polypropylene and acrylic resin.

First claim

The invention claimed is:

1. An injection molding composition selected from the group consisting of compositions (A)-(J):
(A) an injection molding composition consisting of, by weight:
86% of a black zirconium oxide powder, and
14% of a binder having a volumetric composition of:
24% of high density polyethylene;
10% of polypropylene;
4% of a copolymer of ethylene and methacrylic acid, comprising 6.5% wt of methacrylic acid;
10% of an isobutyl methacrylate polymer resin having a molecular weight of 195,000;
1% of an n-butyl and isobutyl methacrylate copolymer resin having a molecular weight of 195,000;
11% of Carnauba wax;
31% of a paraffin wax;
6% of N, N′ ethylene-bis(stearamide); and
3% of a mixture of stearic acid and palmitic acid;

(B) an injection molding composition consisting of, by weight:
86% of a white zirconium oxide powder, and
14% of a binder having a volumetric composition of:
26% of high density polyethylene;
10% of polypropylene;
4% of a copolymer of ethylene and methacrylic acid;
11% of an isobutyl methacrylate polymer resin having a molecular weight of 195,000;
1% of an n-butyl and isobutyl methacrylate copolymer resin having a molecular weight of 195,000;
11% of Carnauba wax;
29% of a paraffin wax; and
8% of N, N′ ethylene-bis(stearamide);

(C) an injection molding composition consisting of, by weight:
86% of an Al 2 O 3 powder, and
14% of a binder having a volumetric composition of:
26% of high density polyethylene;
6% of polypropylene;
3.5% of a copolymer of ethylene and methacrylic acid, comprising 6.5% wt of methacrylic acid;
6% of an isobutyl methacrylate polymer resin having a molecular weight of 195,000;
1% of an n-butyl and isobutyl methacrylate copolymer resin having a molecular weight of 195,000;
12% of Carnauba wax;
35% of a paraffin wax;
5.5% of N, N′ ethylene-bis(stearamide); and
5% of a mixture of stearic acid and palmitic acid;

(D) an injection molding composition consisting of, by weight:
78% of an Al 2 O 3 powder, and
22% of a binder having a volumetric composition of:
28% of high density polyethylene;
2% of polypropylene;
3% of a copolymer of ethylene and methacrylic acid, comprising 6.5% wt of methacrylic acid;
5% of an isobutyl methacrylate polymer resin having a molecular weight of 195,000;
1% of an n-butyl and isobutyl methacrylate copolymer resin having a molecular weight of 195,000;
12% of Carnauba wax;
39% of a paraffin wax;
5% of N, N′ ethylene-bis(stearamide); and
5% of a mixture of stearic acid and palmitic acid;

(E) an injection molding composition consisting of, by weight:
90% of a CrC powder, and
10% of a binder having a volumetric composition of:
24% of high density polyethylene;
6% of polypropylene;
3% of a copolymer of ethylene and methacrylic acid, comprising 6.5% wt of methacrylic acid;
5% of an isobutyl methacrylate polymer resin having a molecular weight of 195,000;
1% of an n-butyl and isobutyl methacrylate copolymer resin having a molecular weight of 195,000;
12% of Carnauba wax;
39% of a paraffin wax;
5% of N, N′ ethylene-bis(stearamide); and
5% of a mixture of stearic acid and palmitic acid;

(F) an injection molding composition consisting of, by weight:
89% of a TiC powder, and
11% of a binder having a volumetric composition of:
24% of high density polyethylene;
6% of polypropylene;
3% of a copolymer of ethylene and methacrylic acid, comprising 6.5% wt of methacrylic acid;
5% of an isobutyl methacrylate polymer resin having a molecular weight of 195,000;
1% of an n-butyl and isobutyl methacrylate copolymer resin having a molecular weight of 195,000;
12% of Carnauba wax;
39% of a paraffin wax;
5% of N, N′ ethylene-bis(stearamide); and
5% of a mixture stearic acid and palmitic acid;

(G) an injection molding composition consisting of, by weight:
94% of a tungsten carbide powder, and
6% of a binder having a volumetric composition of:
25% of high density polyethylene;
8% of polypropylene;
4% of a copolymer of ethylene and methacrylic acid, comprising 6.5% wt of methacrylic acid;
7% of an isobutyl methacrylate polymer resin having a molecular weight of 195,000;
1% of an n-butyl and isobutyl methacrylate copolymer resin having a molecular weight of 195,000;
11% of Carnauba wax;
34% of a paraffin wax;
5% of N, N′ ethylene-bis(stearamide); and
5% of a mixture of stearic acid and palmitic acid;

(H) an injection molding composition consisting of, by weight:
94.5% of a tungsten carbide powder, and
5.5% of a binder having a volumetric composition of:
25% of high density polyethylene;
8% of polypropylene;
4% of a copolymer of ethylene and methacrylic acid, comprising 6.5% wt of methacrylic acid;
7% of an isobutyl methacrylate polymer resin having a molecular weight of 195,000;
1% of an n-butyl and isobutyl methacrylate copolymer resin having a molecular weight of 195,000;
11% of Carnauba wax;
37% of a paraffin wax;
5% of N, N′ ethylene-bis(stearamide); and
2% of a mixture of stearic acid and palmitic acid;

(I) an injection molding composition consisting of, by weight:
94% of a tungsten metal powder, and
6% of a binder having a volumetric composition of:
26% of high density polyethylene;
10% of polypropylene;
4% of a copolymer of ethylene and methacrylic acid, comprising 6.5% wt of methacrylic acid;
9% of an isobutyl methacrylate polymer resin having a molecular weight of 195,000;
1% of an n-butyl and isobutyl methacrylate copolymer resin having a molecular weight of 195,000;
11% of Carnauba wax;
29% of a paraffin wax;
5% of N, N′ ethylene-bis(stearamide); and
5% of a mixture of stearic acid and palmitic acid; and

(J) an injection molding composition consisting of, by weight:
95% of a tungsten metal powder, and
5% of a binder having a volumetric composition of:
25% of high density polyethylene;
10% of polypropylene;
4% of a copolymer of ethylene and methacrylic acid, comprising 6.5% wt of methacrylic acid;
7% of an isobutyl methacrylate polymer resin having a molecular weight of 195,000;
1% of an n-butyl and isobutyl methacrylate copolymer resin having a molecular weight of 195,000;
11% of Carnauba wax;
32% of a paraffin wax;
5% of N, N′ ethylene-bis(stearamide); and
5% of a mixture of stearic acid and palmitic acid.

2. The injection molding composition of claim 1 , which is the composition (A).

3. The injection molding composition of claim 1 , which is the composition (B).

4. The injection molding composition of claim 1 , which is the composition (C).

5. The injection molding composition of claim 1 , which is the composition (D).

6. The injection molding composition of claim 1 , which is the composition (E).

7. The injection molding composition of claim 1 , which is the composition (F).

8. The injection molding composition of claim 1 , which is the composition (G).

9. The injection molding composition of claim 1 , which is the composition (H).

10. The injection molding composition of claim 1 , which is the composition (I).

11. The injection molding composition of claim 1 , which is the composition (J).

Assignees

• Comadur Sa

Inventors

• Cartier Damien

Classifications

• C04B2235/9661

  Colour · CPC title

• C04B2235/3284

  Zinc oxides, zincates, cadmium oxides, cadmiates, mercury oxides, mercurates or oxide forming salts thereof · CPC title

• C04B2235/3275

  Cobalt oxides, cobaltates or cobaltites or oxide forming salts thereof, e.g. bismuth cobaltate, zinc cobaltite · CPC title

• C04B2235/3272

  Iron oxides or oxide forming salts thereof, e.g. hematite, magnetite · CPC title

• C04B2235/3262

  Manganese oxides, manganates, rhenium oxides or oxide-forming salts thereof, e.g. MnO · CPC title