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Патент USA US2401900

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Patented June 11, 1946
2,401,900 -
_ UNITED STATES‘ ‘PATIENT OFFlCE
SOUND RECORDING comosmon
' Horace r. Billings, Haddonfield, NJ" assignor to.
.Radio Corporation of America, a corporation of
Delaware
No Drawing,
Application October 29, 1943,
Serial No. 508,250
"2 Claims.
.
v
1
(01. 106-37) 7
d
.
2
.
This invention relates to acomposition' of mat
combination, may vary between the propomons
ter and to the method of preparing the same, and
‘ of 1 to 1.5 and 1 to 3.5. i In a typical formula,'the
p more particularly to a composition of matter
“soap stock mixture _may be compounded of .30
suitable, for use as a sound recording material.
Compositions of montan wax and stearic acid
per centimontan wax (having an acid value of
80 to 32 milligrams of potassium hydroxide per
gram of wax), '60 percent stearic acid, 2.5 per
in theform of metallic soaps of sodium and lead
have constituted recording wax-like compositions
cent to 3 per cent sodium and 5.5 to 8.5 per cent v
lead. These percentages are based on the ?n
ished stock which constitutes a metallic soap base.
for many years. The gel-forming nature of these
_ soaps is well known,- and when the soap ratio of
uncombined fatty acid is balanced, ?lms of ap- '10 and the stock may be‘prepared according to well
known methods practiced in the art.
proximately 0.020" to 0.030" thick assumeia lus
. To impart to theirsoap stock the desired ?ow
trous surface‘ suitable for use-in sound recording.
characteristics, I then incorporate into‘ it a plas
Heretofore, the ?owing quality of such composi
ticizer consisting of a mixture of a suitable wax,
tions has been controlled by temperature adjust
ments, and this has been relied upon to obtain 15 a mineral oilfand free. stearic acid. The wax
may comprise an animal wax, such as spermaceti, _'
level surfaces of the composition. In some cases,
or a wax such as that sold underv the trade name '
it is desirable to flow the wax-like composition
"Ceranova” wax, which is manufactured by the
onto a suitable base, such as glass, metal or the
Avon Importing Company, New- York city, and
like in the form of a very thin ?lm which forms
the recording surface. In such cases, obviously, \20v consists of a vegetable wax of amorphous nature.
I have found that a plasticizer made up in the
the ?lm must be of uniform thickness and entire
ly level. The flow characteristics'of the prior ' following proportions gives excellent results: art compositions are not such as to afford even
Ceranova wax-approximately 18 per cent.
flow for very thin ?lms.
'
White mineral oil-approximately ‘57 per cent. .
The primary object of _my present invention 25‘Stearic acid (triple pressed)—approximately 25
is to provide an improved composition of matter
suitable for use in sound recording and free from
per cent.
The above materials forming the plasticizer are
the aforementioned difficulty;
More particularly, it is an object ‘of my pres
ent invention to provide an improved composi
added preferably in a particular sequence. First, ‘
30 the Ceranova, wax and the white mineral-oil are‘
tion of matter as aforesaid which will ?ow out
uniformly and evenly even in very thin ?lm layers.
melted together and are- clari?ed. This liquid
mixture is then added with stirring to the liquid ‘
soap stock which is maintained at a temperature
' in the neighborhood ofv 140‘ C. After this maiz
provide a, method of preparing the improved com
‘ position of my present invention.
30 ture has'been well stirred, and while still main
taining the stock at about 140' (2., the static
Another object of my present invention is to
. acid ‘is added in melted form and the entire mix
provide an improved composition of matter and
ture is well stirred to produce a homogeneolm
method as aforesaid which will be highly e?l
cient in use and which can be practiced even by ‘ mixture. The ?nished composition may then be
'A further object of my present invention is to
those not highly skilled in the art of ?owing'wax. 40 cast into forms in suitable. molds. and subse
quently remelted for flowing in thin, uniform
In accordance with my present invention,‘ I
incorporate into a suitable metallic soap base a.
plasticizer comprising a mixture of a wax, a, min- > '
eral oil, and free stearic acid.
The wax may be
?lms onglass, metal, or other suitable surfaces.’ -
The amount of‘ improved plastlciner according
w my present
invention which is added to the f
_
either of vegetable or animal origin, as more fully 45 base or soap stock constitutes between 8 per cent
set forth hereinafter. Preferably, the soap stock
' to 10 per cent by weight ot‘the ?nished- composi- ‘
is om made up, after which the wax and mineral ,
tiom The sound
material produced as
oil are preferably ?rst added thereto, the free a above dwcribed is much more glossy ?lln lim- ‘
stearic acid being added as the last ingredient.
?ar prior art compositions and has far less temb/ I
In, practicing the present invention, the soap 50 ency to fog after cooling in the form of a ?lm.l
stock or base may be made up of sodium and lead
Also, a reeud made of the composition eoca'ding
oompolmded with a mixture of stearic acid, and 4.
montan'wex.‘ The montan wax to stearic acid
ratiomayvar'ybetweentheproportionsoflto-
to > myprel'mtinventi'onwillbefolmdtobeex
_
andwillresultinmorefeithful
reproductfon‘otthem'lginslsmmds. -
zsandltotfl‘hesodiumandleadin-chemicalw mthoushlhaveshownanddescribedbntone
2,491,900
form of my invention and one method or pre
, paring the same, it will undoubtedly be obvious
.to those skilled in the art that many changesin
' both are possible within the spirit of the'present '
invention. I therefore desire that my invention
shall not be limited except insofar as is made
necessary by the prior art and by the. spirit of‘
the appended claims.
I claim as my invention:
-
-
approximately 18 percent wax, approximately 5'7
percent mineral oil and, approximately 25,. per
cent stearic acid by weight,
-
a
4
2. The method 01’ preparing'a composition or‘
matter suitable for use as a sound recording ma;
terial which comprises preparing a base stock oi_- '
one or more metallic soaps, and thereafter adding ‘
5 to said stock a plasticizer'adapted to enhance the
' ?ow characteristics of said’ stock in relatit'ely'thin
1. A composition of matter suitable for use in 10 ?lms, said plasticizer comprising a mixture 01' a
recording sound which comprises a base of a.
wax,’ a mineral oil and stearic acid, and said wax
metallic soap in which is incorporated a plas
and mineral oil being added to said stock prior
ticizer comprising a mixture of a wax, a mineral ' r >
to adding the stearic acid ‘thereto.
oil and tree atearic acid. said mixture containing
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HORACE P.’ *BILLINGS;
r
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