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.
Claims20
A binder suitable for an injection molding composition, the binder comprising, based on total binder volume:
- a polymeric base, in a range of from 40 to 55 vol. %;
- a mixture of waxes, or a mixture of wax and palm oil, in a range of from 35 to 45 vol. %;
- and
- a surfactant, in at least 5 vol. %,
- wherein the polymeric base of comprises (i) a copolymer ethylene and methacrylic or acrylic acid, (ii) a copolymer of ethylene and propylene and/or maleic anhydride-grafted polypropylene, and (iii) a solvent-soluble polymer, soluble in isopropyl alcohol, propyl alcohol, turpentine, or a mixture thereof, and
- wherein the solvent-soluble polymer (iii) is a cellulose acetate butyrate, a polyvinyl butyral, and/or a copolyamide, and
- wherein the binder has a lower viscosity, measured with a capillary rheometer with a 1 mm diameter and 20 mm length die, at 172° C. and shear rates of 10, 100, and 1000 Hz, than a binder lacking the solvent-soluble polymer (iii).
Dependencies are inferred from the claim text.