Binder for injection moulding compositions
AssigneeComadur SA
InventorsDamien CARTIER, Jonathan DUMAIN
Life of this patent
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Abstract
A binder for an injection moulding composition including: from 40 to 55 volume percent of a polymeric base, from 35 to 45 volume percent of a mixture of waxes or a mixture of wax and palm oil, and at least 5 volume percent of at least one surfactant, wherein the polymeric base is formed of copolymers of ethylene and methacrylic or acrylic acid, copolymers of ethylene and propylene and/or maleic anhydride-grafted polypropylene, and polymers soluble in isopropyl alcohol, propyl alcohol and/or turpentine, and chosen from the group including a cellulose acetate butyrate, a polyvinyl butyral and a copolyamide, the respective quantities of the binder components being such that their sum is equal to 100 volume percent of the binder.
Claims16
A binder for injection moulding composition including as components:
- from 40 to 55 volume percent of a polymeric base,
- from 35 to 45 volume percent of a mixture of waxes or a mixture of wax and palm oil,
- and at least 5 volume percent of at least one surfactant,
- wherein the polymeric base is formed of copolymers of ethylene and methacrylic or acrylic acid, copolymers of ethylene and propylene and/or maleic anhydride-grafted polypropylene, and polymers soluble in solvents chosen from the group including isopropyl alcohol, propyl alcohol, turpentine, and mixtures thereof, and chosen from the group including a cellulose acetate butyrate, a polyvinyl butyral and a copolyamide, the respective quantities of the binder components being such that their sum is equal to 100 volume percent of the binder.
An injection moulding composition (feedstock) intended for fabrication of shaped metal or ceramic parts including 76 to 96 wt. % of an inrganic powder and 4 to 24 wt % of a binder for injection moulding composition including as components:
- from 40 to 55 volume percent of a polymeric base,
- from 35 to 45 volume percent of a mixture of waxes or a mixture of wax and palm oil,
- and at least 5 volume percent of at least one surfactant, wherein the polymeric base is formed of copolymers of ethylene and methacrylic or acrylic acid, copolymers of ethylene and propylene and/or maleic anhydride-grafted polypropylene, and polymers soluble in solvents chosen from the group including isopropyl alcohol, propyl alcohol, turpentine, and mixtures thereof, and chosen from the group including a cellulose acetate butyrate, a polyvinyl butyral and a copolyamide, the respective quantities of the binder components being such that their sum is equal to 100 volume percent of the binder.
Dependencies are inferred from the claim text.