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Патент USA US2405658

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Patented Aug. 13, 1946
UNITED ' STATES PATENT OFFICE
2,405,658
MOLDING MATERIALS
Henry Kremer, London, England
No Drawing. Application April 8, 1943, Serial No.
482,320. In Great Britain May 29, 1942
2 Claims.
(C1. 117-—72)
1
2
This invention consists in improvements in or
100 025. may be added to the blood prior to mix
relating to molding materials and is an improve"
ing.
ment in or a modi?cation of the invention claimed
In another example of this type of material
urea formaldehyde resin (resin content 80 to
90%) with the appropriate hardener may be used
instead of phenolic resin. In this case the mix
ture should be molded without further drying.
As an example of the type of material in which
and described in the speci?cation of prior appli
cation for United States Letters Patent Serial
No. 397,331.
.
The invention claimed in the prior speci?ca
tion comprised a dry composite molding material
having an inactive ?ller the whole or substantially
both the coating and/or impregnating materi
the whole of the particles of which received a 10 .terials are synthetic resins, 15 lbs. of phenol.
double coating and/or impregnation with two dif
formaldehyde resin stage A is thoroughly mixed
ferent materials each of which, when dry, will
into 50 lbs. of sawdust or other inert ?ller so that
substantially every grain is impregnated and/or
constitute with the ?ller a moldable product.
Such a dry composite material will be referred
coated. This is then dried and is again impreg
to in the ‘following description and appended 15 nated and/or coated with 15 lbs. of resorcinol
formaldehyde resin and is then dried and molded
'claims as i‘a moldable material of the kind de
' scribed.”
in the usual way. Both resins preferably have
The improvement or modi?cation according to
approximately 50 % solid resin content.
When blood is described herein as being em
the present invention comprises a moldable ma
terial of the kind described in which one of the 20 ployed, it may be derived from any source or in
coating and/or impregnating materials is a syn
place of liquid blood, blood clots only or red cells
thetic resin and the other material is either a dif
of blood or any dried product of such materials
may be utilised. In the case of dried products of
ferent kind of synthetic resin or a solution con
taining a protein material such as blood.
blood such a material is preferably formed into
When both coatings are synthetic resin ma 25 a dispersion or solution before use.
I claim:
terials they will be of two di?erent types both
having different qualities and advantages.
11. A process for making a composite material
In one example of the invention the ?rst ap
moldable under heat and pressure which process
comprises treating a particulate ?brous organici
plied coating or impregnation contains blood as
the protein material and the other coating may 30:?ller consisting of wood particles with su?icient‘
be a synthetic resin of any type such as phenol
blood to provide substantially all of said individ
aldehyde, cresol aldehyde, urea aldehyde, or res
ual particles with a coating thereof, drying the
ins of a synthetic rubber class.
blood-coated particles, superposing on the coated
one speci?c example of the invention 400
particles a coating of a water-soluble phenolic
ozs‘Fof liquid blood is mixed with 13% ozs. of 35 formaldehyde resin and drying the coated par
ammonium hydroxide (S. P. 0.92) after which
ticles.
30 ozs. of paraformaldehyde, in the form of a
2; A process for making a compositematerial
milk, is then thoroughly mixed in. To this blood
moldable under heat and pressure which process
mixture is now added 48 lbs. of sawdust or other
comprises applying consecutively 'to substantially
inert ?llers and the mixture dried, after which 40 all the individual particles of a particulate ?brous
10 lbs. of water-soluble phenol formaldehyde res
organic ?ller two adherent and enveloping coat
in, stage A, is mixed in so that every grain of
ings one of which consists of a liquid comprising
the mixture is thoroughly coated with the resin.
blood and the other of a liquid comprising an
The latter is now dried and the resultant mate
uncured phenol-formaldehyde resin, each coat
rial‘ is then ready for pressing or molding in ac 45 ing operation being followed by a drying opera
cordance with the usual technique. Should the
tion insu?icient to cure the coatings.
sawdust be ?ne a small quantity of water, say
HENRY KREMER.
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