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Thermoplastic molding compounds for the production of inorganic sintered moldings and a process for the production of inorganic sintered moldings
| Details |
Inventors: Ohst, Holger; Schonfelder, Lothar; Roth, Stefan;
Assignee: Bayer Aktiengesellschaft (Leverkusen, DE)
Primary Examiner: Short; Patricia A.
Assistant Examiner:
Attorney, Agent or Firm: Connolly & Hutz
A molding compound is disclosed which is useful in producing inorganic sintered moldings, which contains, in addition to an inorganic powder, a binder system containing a thermoplastically processable, partially crystalline polyester and an additional low molecular weight compound which may react with the polyester. A process is disclosed for preparing a sintered molding by injection molding of the molding compound, removal of the binder system, and sintering. |
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DETAILED DESCRIPTION What is claimed is: 1.
A molding compound for the production of inorganic sintered moldings comprising: a) silicon powder, silicon nitride powder, or a mixture thereof; and b) a binder system consisting essentially of 20 to 80% by weight of a thermoplastically-processable, partly crystalline elastomeric polyester having a melt temperature of >130.
degree.
C.
and 20 to 80% by weight of volatile organic low molecular weight compounds having a molecular weight of less than 500 g/mol, the low molecular weight compounds being selected from the group consisting of di-(2-ethylhexyl)-phthalate, phthalic acid dialkyl esters, adipic acid dialkyl esters, fatty acid esters, glyoxolic acid diethyl ester, and monomeric or oligomeric carbonates, and the binder system further containing a polyfunctional compound capable of crosslinking the polyester by transesterification, the polyfunctional compound consisting of an ester based on glycerol, trimethylol propane, pentaerythritol, furanose, glucose, cellulose, starch, or polyvinyl alcohol.
Description:
This invention relates to molding compounds for the production of inorganic sintered moldings suitable for injection molding or extrusion and to a process for the production of inorganic sintered moldings.
It is known that moldings can be produced from inorganic materials by mixing a ceramic powder or a metal powder with a thermoplastic resin, forming the resulting mixture into a green compact, removing the thermoplastic resin and then sintering the green compact freed from the resin to form the molding.
The thermoplastic resin or binder used is selected, for example, from polystyrene, polypropylene, polyethylene, polyethylene-co-vinyl acetate or polymethyl methacrylate, generally in combination with auxiliaries such as, for example, stearic acid or dioctyl phthalate to improve the slip properties of the ceramic paste.
A detailed review of the prior art can be found in synoptic articles by M.
J.
Edirisinghe and J.
R.
G.
Evans, Int
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Adhesives and Rubbers 
