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Патент USA US2406428

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Patented Aug. 27. 1946
2,406,428 _
_ I ycomrosrrmN
1 Christopher Luekliaupt, Jamaica, N. Y., assignor
-I ‘to Augustus BuSo'uthwoi'th, .EnglewoomN. J .
No Drawing. Application Inuit-5,1943, t"
Serial No. “495,666 c
p 2. Claims.
(01. 106-287)
This invention relates to plastic compositions,
Example D
and is particularly directed to a new composi
tion of matter suitable for many uses, such as
the production of jigs, forming dies, bookends,
lighting ?xtures, et .
Per cent
Litharge ______________________________ _ .
More speci?cally my invention relates to a new
ing a dense homogeneous mass, possessing con
ous to mention.
60. 0
16. 6
Glycerine. __________________________________ __
16. 6
Iron ?lings_-__
siderable strength and highly useful for the pur
poses above referred to and others too numer
Iron dust ____ __
powdered metal composition of matter provid
Of the examples above set out, Example A
is the best from the standpoint of density and
resistance to crushing, although in all cases I
produced a useful composition of matter. I ?nd
Still more speci?cally my invention provides a
composition of the character indicated from
that the strength of my new composition of mat
which objects may be made having low electrical
conductivity, the metal particles of the compo 15 ter is improved if metal ?lings as well as pow
dered metal are employed as set out in Examples
sition being bound together by a binder posses
A. C and D. The ?lings are somewhat needle
sing a great a?inity for the metal particles so
shaped and seem to act as a reinforcing agent
that no di?iculty is experienced in the produc
with respect to the mass or aggregate.
tion of the composition in obtaining excellent 00
hesion between the particles and binder without 20 The actual manufacture of the “material is
simplicity itself. I ?rst mix the metal and the
employing either pressures or elevated temper
litharge until the two are well and thoroughly
‘blended. The glycerine is then added and well
The binder employed is litharge and glycerine.
mixed in. In the examples given, the material
The amount of binder employed may be varied
somewhat but in all cases I have found that best 25 at this time is in the form of a plastic mass of
about the ‘consistency of putty or heavy dough,
results are obtained when employing about 50%
sufficiently workable at that stage to enable the
by weight of litharge and around 15% by weight
same to be placed in a mould and for it to take
of glycerine.
the shape of the mould without the employment
Example‘ A
of pressure. The material is then allowed to
30 stand at room temperature until it has thor
oughlyset. This depends :upon the quantity of
_Pounds Per cent
material undergoing processing. A small quan
tity requires but a short time, may be an hour
Litharge_ _ _
57. 1
Iron dust
21. 4
to set up, while twice the amount would require
Iron ?ling
7. 3
14,. 2 3.5 a longer period. In the quantities given in the
above examples, two hours is a sui‘?cient setting
Apparently some chemical reaction takes place
because I find that after the ingredients are
Per cent
Litharge .................................... __
on dust.
59. 2
22. 2
Graphite__ ..
14. 8
3. 7
_______________ ._
_________________________ __
Example C
Litharge ......................... -.
Glycerine _________________________ ._
$4 _ . _ _
‘ what above room temperature.
I ?nd also that
aging has a bene?cial e?ect in that the hardness
of the mass increases somewhat as time goes on.
I believe this change is due to the activation of
the metal by the litharge and glycerine to pro
duce a tighter bond or knit.
It is impossible to mention all of the uses to
‘which this composition of matter may be put.
And whether the mass is molded or not, in that
Ounces Per cent 50
it is placed in a closed mould and allowed to set,
or whether it is simply. placed in an open con
49. 0
12. 2
tainer and allowed to set, depends upon circum:
_ _ __
12. 2
26. 5
stances, mainly upon the use to be made of the
material, because it is to be appreciated that my
55 composition of matter need not be molded into
Iron dust_.__
Iron ?lings._
40 mixed the temperature of the mass rises some
obtained employing around 50% by weight of v
?nal form in that it can be worked with ordinary
metal working tools the same as cast iron, tool
steels and other metals. In all cases Iobtain a
homogeneous aggregate in which the particles
of metal are each surrounded by and held to each
other by the lithargejand glycerineo
a‘ :
' lithargeand 15% by weight of glycerine.
What I claim is:
1. A plastic composition comprising a homo
geneous aggregate of between about 49% and
¢about~59% by weight litharge, between about 23%
1 '
Inasmuchv as the litharge andl;.'g1ycerine are
high resistance materials, objects produced by .
my process while high in metal content are poor :10
electrical conductors which may be of advantage
in cases where hardness and high resistance; to
and about-33% by weight of ?nely divided me
tallic particles, and between about 15% and
about 26 % by weight glycerin.
7,2..A plastic composition comprising a homo;
‘geneous aggregate of between about 49% and
about 59% by weight litharge, between about 23%
crushing is desired but high electrical conductivr : ‘ and ‘about 33% by weight of ?nely divided me
ity would be detrimental.
tallic iron particles, and between about 15% and
It is to be understood that the proportions of"
the ingredients'of the materials employed may 15 about 26 % by weight glycerin.
be varied from those above given, "although‘qas;
have already stated apparently best results-"are
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