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Патент USA US2407193

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Patented Sept. 3, 1946
2,407,193 .
UNITED STATES PATENT OFFICE
2,407,193
RUBBER RECLAIM
Harry H. Thompson, Akron, Ohio, assignor to
Wingfoot Corporation, Akron, Ohio, a corpora
tion of Delaware
No Drawing. Application March 6, 1942,
Serial No. 433,673
1
.
3 Claims. (01. 260-714)
This invention relates to a method of reclaim
ing rubber and the production of a reclaim mate~
rial which may be used under white rubber stocks
such as white sidewall tire stocks without caus
ing discoloration of the white covering layer.
According to this invention, oils and chemicals
which cause dark stains to‘ appear on a covering
white stock are dissolved and removed from scrap
rubber stock which has been subjected to a re
2
cooked stock is drained and then washed. The
mixture used for the extraction is preferred for
Washing. The stock is then dried and re?ned by
any usual procedure.
The following example will illustrate the in
vention: One thousand pounds of scrap rubber
containing phenyl beta naphthylamine as anti
oxidant is ground, devulcanized by the alkali
process (or any other standard procedure) and
claiming process. The treatment is designed par 10 then dried. This is then cooked in 125 gallons
ticularly to remove phenyl beta naphthylamine
of a mixture of 60% of carbon tetrachloride and
from the scrap rubber.
The scrap rubber is ground, devulcanized and
dried in any usual'manner, then before re?ning,
40% of methyl alcohol for 6 hours under a re?ux
condenser. The material is then drained, washed
with 125 gallons of the mixed solvent, drained
the dried granular particles are cooked in a mix 15 again and dried. This removes the phenyl beta
ture of a swelling agent and a primary alcohol,
naphthylamine and other objectionableoils and
for example, carbon tetrachloride and methyl
‘chemicals, etc. which would cause staining if the
alcohol, to dissolve out the oils and chemicals,
reclaim without undergoing such treatment were
etc. which cause discoloration or which have dis
solved in them the materials which cause dis
coloration. The preferred mixture contains any
where from 50 to 90% of carbon tetrachloride,
and 50 to 10% of methyl alcohol. It may, for
used under a white rubber stock, as for example,
20 under the white rubber surface coating of a white
sidewall tire. The stock, after drying, is re?ned
by massing on regular mills and re?ning on
standard reclaim machines.
example, consist of 60% of carbon tetrachloride .
I claim:
and 40% of methyl alcohol or 80% of carbon 25
1. A process for preparing a non-staining re
tetrachloride and 20% of methyl alcohol. The
carbon tetrachloride serves to swell the rubber
and thus aids in the action of the alcohol in dis
solving the chemicals, etc. Instead of methyl
alcohol any primary alcohol, such as ethyl alco
hol, etc. may be used. Acetone can be employed
but is not as satisfactory as methyl alcohol.
claim rubber which comprises re?uxing solid,
alkali reclaimed rubber with a solvent mixture
containing 50 to 90 percent of carbon tetrachlo-v
ride, the remainder of the solvent mixture being
30 methyl alcohol.
2. A process for preparing a non-staining re
claim rubber which comprises treating solid, de
Butyl alcohol is rather viscous but may be used.
The extraction of the discoloring matter is ac
vulcanized rubber with a mixture of carbon tetra
etc. Usually cooking for about 6 hours at 70-80"
C. is su?icient to extract the objectionable mate
vulcanized rubber with a mixture of carbon tetra
chloride and a solvent selected from the class con
complished by cooking. The time of cooking 85 chloride and methyl alcohol.
3. A process for preparing a non-staining re
may vary depending upon the temperature used,
claim rubber which comprises treating solid, de
rial. I Lower or higher temperatures, such as room
sisting of methyl alcohol, ethyl alcohol, butyl
temperature, etc. may be used, but the time of 40 alcohol and acetone.
treatment may be adjusted accordingly.
HARRY H. THOMPSON.
After the cooking has been completed, the
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