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US 2009/0288739 A1Published application
Binder-comprising thermoplastic compositions for producing shaped metallic bodies
AssigneeBASF SE
InventorsHans Wohlfromm, Jens Assmann, Johan Herman Hendrik ter Maat, Martin Blömacher
Life of this patent
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Abstract
The present invention relates to binders for pulverulent metals or pulverulent metal alloys, thermoplastic compositions comprising these binders for producing shaped metallic bodies, a process for producing them, their use and a process for producing shaped bodies therefrom.
Claims20
A binder B) for pulverulent metals or metal alloys or mixtures thereof, which comprises
- B1) from 50 to 96% by weight of one or more polyoxymethylene homopolymers or copolymers;
- B2) from 2 to 35% by weight of one or more polyolefins;
- B3) from 2 to 40% by weight of poly-1,3-dioxepane or poly-1,3-dioxolane or mixtures thereof,
- where the proportions by weight of the components B1, B2 and B3 add up to 100%.
1 more element
A thermoplastic composition for producing shaped metallic bodies, which comprises
- A) from 40 to 70% by volume of a sinterable pulverulent metal or a sinterable pulverulent metal alloy or mixtures thereof,
- B) from 30 to 60% by volume of a mixture of
- B1) from 50 to 96% by weight of one or more polyoxymethylene homopolymers or copolymers;
- B2) from 2 to 35% by weight of one or more polyolefins;
- B3) from 2 to 40% by weight of poly-1,3-dioxepane or poly-1,3-dioxolane or mixtures thereof
- as binder, where the proportions by weight of the components B1, B2 and B3 add up to 100%, and
- C) from 0 to 5% by volume of a dispersant.
4 more elements
A process for producing a thermoplastic composition comprising as significant components
- A) from 40 to 70% by volume of a sinterable pulverulent metal or a sinterable pulverulent metal alloy or mixtures thereof,
- B) from 30 to 60% by volume of a mixture of
- B1) from 50 to 96% by weight of one or more polyoxymethylene homopolymers or copolymers;
- B2) from 2 to 35% by weight of one or more polyolefins;
- B3) from 2 to 40% by weight of poly-1,3-dioxepane or poly-1,3-dioxolane or mixtures thereof
- as binder, where the proportions by weight of the components B1, B2 and B3 add up to 100%, and
- C) from 0 to 5% by volume of a dispersant,
- wherein
- a1) the component B) is melted at temperatures of from 150 to 220° C. and subsequently
- b1) the component A), if appropriate together with the component C), is metered into the melt stream of the component B) at temperatures in the same range as in step a) or
- a2) the components B) and C) are melted in the presence of the component A) at temperatures of from 150 to 220° C.
8 more elements
Dependencies are inferred from the claim text.