Rubber Compund and Material for Use in Making the Same. Page: 1 of 2
This patent is part of the collection entitled: Texas Patents and was provided to The Portal to Texas History by the UNT Libraries Government Documents Department.
Extracted Text
The following text was automatically extracted from the image on this page using optical character recognition software:
UNITED STATESPATENT OFFICE
EBENEZER W. STRAIN, OF PHILADELPHIA, PENNSYLVANIA.
RUBBER COMPOUND AND MATERIAL FOR USE IN MAKING SAME.No. 875,298.
To all whom it may concern:
BI it known that I, EBENEZER W. STRAIN,
a citizen of the United States, residing. at
Philadelphia, in the county of Philadelphia
5 and State of Pennsylvania, have invented
new and useful Improvements in Rubber
Compound and Material for Use in Making
Same, of which the following is a specifica-
tion.
10 The object of this invention is to pro-ide
a rubber compound which shall possess all
of the properties of rubber and which, in ad-
dition, will not be deleteriously affected by the
contact therewith of oils, thereby presenting
15 a compound particularly serviceable for use
in bearings, and for similar applications,
where lubricants are employed.
It is well known to the rubber industry
that petroleum and its products are solvents
20 of rubber and very destructive to manufac-
tlured goods, but I have discovered that cer-
tain products of asphaltic petroleums, when
prepared as hereinafter described, are non-
solvent of rubber unless high temperatures
25 are applied. These products, however, of
themselves not only have no affinity for rub-
ber, but when combined with it destroy, to a
great extent, the elastic properties thereof
and render it undesirable for use except for
3o filling.
In proceeding according to my invention
I first take a crude asphaltic petroleum and
eliminate thevolatile constituents thereof by
distillation, after which the remaining heavy
35 products are also distilled and refined by the
ordinary methods known to the trade, leav-
ing in the still a bitumen in some respects re-
sermbling black wax, and which, when blown
in the still by the usual method employed by
40 oil refiners, produces an elastic bitumen that
is pliable at low temperatures. This bitu-
men will combine with rubber at high tem-
peratures, varying from 2500 F. to 350* F.,
but, as stated above, is deleterious in its
45 effect when used in a raw state. To make
this product valuable for use with rubber,
I combine with the bitumena product of the
sap of pine or resinous trees, known to theJ
trade as virgin dip or gum thus; or I may
50 employ, in lieu of either of the latter, the res-
inous matter left at the still after the spirits
of turpentine have been eliminated, which is
known to the trade as rosin pitch. All of
these last - mentioned substances contain
55 acids having an affinity for rubber, and when
combined with the before-mentioned bitu- lPatented Dec. 31, 1907.
men produce a compound which may be
readily combined with rubber, resulting in
the production of a rubber. compound pos-
sessing the properties above noted. 60
Instead of using the bitumen and virgin
dip, or gum thus as first compounded, I
may use the distilled product resulting from
this compound, as hereinafter described.
The asphaltic bitumen is a. solid, gummy, 65
waxy substance, while the distillate there-
from is a soft semi-fluid gummy substance,
substantially the same as the bitumen, ex-
cept that the distilling removes a portion of
the carbon, no paraffin crystals being formed 70
by the distillation. The bitumen, and the
distillate therefrom, are substantially the
same in the principal chemical constituents.
In practice I take eighty to ninety per cent.
asphaltic base bitumen and ten to twenty per 75
cent. of oxidized hydro-carbon of the ter-
pene series, such as virgin dip or gum thus,
and place these two substances in a kettle
and subject them to a temperature of about
3250 F. After the ingredients are thoroughly so
combined the product is then ready for
use to combine with rubber. If preferred,
however, I may place the bitumen and virgin
lip, or gum thus, in a still, instead of in a
kettle, and, after a temperature of 325 has 85
been reached, continue the operation at a
still higher temperature sufficient to distil
the whole product together, and the resulting
distillate can then be combined with rubber,
with the exception of the product first coin- 90
ing over, which is a volatile solvent of rubber.
As stated above, I may use rosin in place
of the virgin dip or gum thus, but either of
the latter is preferred.
It may be explained that virgin dip is the 95
first run of sap from a tree, while gum thus is
the sap from the tree in the later years of its
life. The addition of the virgin dip or gum
thus, or rosin produced from the same, im-
parts to the petroleum an affinity for rubber, 100
and prevents 'the shortening of the elastic
properties natural in rubber when petroleum
products are combined therewith.
So far as I am aware, the residue from as-
phaltic base petroleum, as made within the .105
past two years, is unlike any made in pre-
vious years, owing to the different character
of the crude petroleum and a process results
in the production of a bitumen of a rubber-
like, gummy and waxy character, one which 110
is pliable at very low temperatures and which
does not fly into fragments under a blow, asSpecification of Letters Patent.
Application filed October 30, 1905. Serial No. 285,040.
Upcoming Pages
Here’s what’s next.
Search Inside
This patent can be searched. Note: Results may vary based on the legibility of text within the document.
Tools / Downloads
Get a copy of this page or view the extracted text.
Citing and Sharing
Basic information for referencing this web page. We also provide extended guidance on usage rights, references, copying or embedding.
Reference the current page of this Patent.
Strain, Ebenezer W. Rubber Compund and Material for Use in Making the Same., patent, December 31, 1907; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth509332/m1/1/?rotate=270: accessed July 18, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.