EP0264287A2
Expired / Lapsed
EP
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Iron-based powder mixtures
Assignee: Hoeganaes Corp
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Filing: 1987-10-15
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Granted: —
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Expires: 2007-10-15
Abstract
Abstract A powder composition of an iron-based powder and an alloying powder is provided. Segregation and dusting of the alloying powder is eliminated or substantially reduced when the powder composition contains a polymeric binding agent which is soluble in water, and preferably which is an adherent film-former.
Inventors
- 👤 Frederick J. Semel
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 09:48
CPC Classifications
C; C22; C22C; C22C33/00; C22C33/02; C22C33/0207; B; B22; B22F; B22F1/00; B22F1/10; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12181
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
125 words
A powder composition of the kind comprising (a) an iron-based powder selected from the group consisting of iron powders and steel powders, (b) a minor amount of at least one alloying powder, and (c) a binding agent for said iron-based and alloying powders, said composition having been formed by mechanically mixing said iron-based powder and said alloying powder with said binding agent, characterised in that the binding agent is a resin substantially insoluble in water selected from the group consisting of (1) Homopolymers of vinyl acetate or copolymers of vinyl acetate in which at least 50% of the monomeric units are vinyl acetate; (2) Cellulosic ester or other ether resins; (3) Methacrylate polymers or copolymers; (4) Alkyd resins; (5) Polyurethane resins; and (6) Polyester resins.
Claim 2
Dependent Claim
125 words
A powder composition of the kind comprising (a) an iron-based powder selected from the group consisting of iron powders and steel powders, (b) a minor amount of at least one alloying powder, and (c) a binding agent for said iron-based and alloying powders, said composition having been formed by mechanically mixing said iron-based powder and said alloying powder with said binding agent, characterised in that the binding agent is a resin substantially insoluble in water selected from the group consisting of (1) Homopolymers of vinyl acetate or copolymers of vinyl acetate in which at least 50% of the monomeric units are vinyl acetate; (2) Cellulosic ester or other ether resins; (3) Methacrylate polymers or copolymers; (4) Alkyd resins; (5) Polyurethane resins; and (6) Polyester resins.
Claim 3
Dependent Claim
13 words
A composition of claim 1 in which the binding agent is polyvinyl acetate.
Claim 4
Dependent Claim
29 words
A composition of claim 1 in which the binding agent is a cellulose resin selected from the group consisting of ethyl cellulose; cellulose acetate; cellulose acetate butyrate; and nitrocellulose.
Claim 5
Dependent Claim
38 words
A composition of claim 1 in which the binding agent is a methacrylate resin selected from the group consisting of polymethyl methacrylate; polyethyl methacrylate; polybutyl methacrylate such as n-butyl methacrylate homopolymer; methyl/butyl methacrylate copolymer; and methyl/ethyl methacrylate copolymer.
Claim 6
Dependent Claim
61 words
A composition of claim 1 in which the binding agent is an alkyd resin selected from the group consisting of alkyd resin modified with a drying oil; and alkyd resin modified with a polymerized ethylenically-unsaturated monomer such as alkyd resin which is a pre-polymer of phthalic acid or phthalic anhydride and ethylene glycol having said pre-polymer modified with a vinyltoluene polymer.
Claim 7
Dependent Claim
47 words
A composition of claim 1 in which the binding agent is a polyurethane resin cured by exposure to ambient moisture such as a polyurethane resin cured from a pre-polymer containing free isocyanate groups and a cross-linking agent selected from the group consisting of polyamines and monomeric polyols.
Claim 8
Dependent Claim
109 words
A composition of claim 1 in which the binding agent is a polyester resin which is the reaction product of (a) the condensation product of an unsaturated dicarboxylic acid having 4-6 carbon atoms and a dihydroxy alcohol having 2-4 carbon atoms, and (b) an ethylenically unsaturated monomer, such as a polyester resin selected from the group consisting of those in which the condensation product is of maleic or fumaric acid and ethylene glycol, and in which the monomer is diallyl phthalate, vinyl toluene, styrene, or a methacrylate resin; and those in which the condensation product is of maleic acid and ethylene glycol, and in which the monomer is styrene.
Claim 9
Dependent Claim
26 words
A composition of any one of claims 1 to 7 containing about 0.005-1.0% by weight of the binding agent based on the total powder composition weight.
Claim 10
Dependent Claim
53 words
A composition of any preceding claim in which the alloying powder has a mean particle size up to about 20 microns and in which the weight ratio of binding agent to alloying powder in the composition is dependent on the density of the alloying powder and is in accordance with the following schedule
References Cited (Backward Citations)
No citation records indexed.
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