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Патент USA US3025213

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United States Patet
3,025,203
Fatented Mar. 13, 19?2
1
2
3,025,203
the invention these additives, such as pigments, perfumes,
dyes, impregnating agents, or active substances that pos
sess, say, deodorizing, disinfecting, or bactericidal action,
PROCESS FOR CONSGLIDATHNG FlBlRE?
Curt Walter Leupold and Rolf Mohr, Nurnberg, and
Kurt Sponsel, Krefeld, Germany; said Leupold assignor
to Vereinigte Papierwerke Schiekedanz & Co., Num
berg, Germany, a corporation of Germany
No Drawing. Filed Dec. 26, 1957, Ser. No. 705,116
3 Claims. (Cl. 156-36)
may be added to the aqueous solution described above
and thus sprayed on together with the latter. More par
ticularly, when they are not water-soluble, they may be
applied subsequently, before the heat treatment. This
presupposes that they can be subjected to this heat with
out suffering damage.
Various ways of connecting ?bers together are known. 10
Among these processes cementing plays an important role.
Quite different products may be employed as cements.
It is dif?cult, however, to secure good consolidation of
The following examples are cited of the suggestions in
accordance with the invention:
.
Example 1
?bers in the wet and dry states and at the same time to
Thus, for example, 15 2000 grams methylcellulose
500 grams urea-formaldehyde pro-condensate
500 ml. glacial acetic acid
but they are not waterproof. It is also known that such
1000 grams glycerol
[fibers can be consolidated by employing synthetic resins,
such as the polyvinyl acetates, styrol polymers, and urea
are dissolved in 100 liters of water and sprayed on a cel
formaldehyde combinations. But securing adequate con 20 luose ?ber ?eece weighing 20 g. per sq. m. in such a man
solidation of the fibers in this manner requires the em
ner that 50 gram-s of sprayed liquid are applied to 1 sq. m.,
" ployment of such quantities as to impart a stiff, in fact,
equivalent to a dry substance of about 1.3 g. per sq. in.
boardlike character to the end product as a rule, which
secure ‘a soft, absorbent material.
soft products can be produced by using methylcellulose,
Example 2
thus possesses no absorbency. Up to the present time no
suitable consolidation agent has been found ‘for manufac 25
2000 g. methylcellulose
turing ?ber products that are waterproof and yet ab
sorbent, while possessing high breaking strength trans
versely and longitudinally.
1600 g. melamine-formaldehyde-resin pre-oondensate
400 g. ammonium oxalate
500 g. concentrated sorbitol solution
In the invention absorbent though waterproof ?ber
products are produced to solve this problem by applying, 30 100 g. mercury oxycyanide
especially by spraying, aqueous solutions of formalde
hyde, urea, or urea derivatives and methylcellulose to the
?bers to be fastened together. The water is then evapo
are dissolved in 100 liters of water. This solution yields
excellent consolidation of cellulose ?bers, besides pos
sessing very good germicidal action. The active antibac
rated olf, and the ?brous material is heated, allowing for
its resistance to heat. It is advisable to add a hardening 35 terial agent is imbedded in the plastic layer and exhibits
high surface-active strength despite its low concentration.
catalyst to this aqueous solution in known manner before
In addition to its favorable physical properties men
it is sprayed‘. Various chemical reactions take place when
tioned, the product of the process covered by the inven
a solution consisting of the four substances mentioned is
tion also possesses the advantage, in contrast to ?brous
Not only do urea and formaldehyde react together in 40 materials consolidated by known processes, of not irritat
ing the skin. Hence, products made in accordance with
known fashion, but the traces of formaldehyde that escape
the invention are highly adapted, say, for use as wrappers
during heating also react with the methylcellulose as well
for sanitary napkins or for so-called paper handkerchiefs
as with cellulose ?bers when the latter are employed.
or for all articles that come in contact with the human or
Though methylcellulose as such is water-soluble, it thus
enters into water-insoluble compounds with the other con 45 animal mucosa.
We claim:
stituents. The resulting substances ‘are tough and resilient
1. A process for consolidating cellulose ?bres to pro
and adhere very ?rmly to the ?bers. As the water-insolu
duce a matted unwoven material, said method compris
ble plastic coating is ?rst formed on the ?ber, the ?bers
ing the steps of applying to the ?bres an aqueous solution
enveloped by the resulting plastic ?lm are fastened to
employed.
gether very well. The ?bers, which exist preferably with 50 containing formaldehyde, methyl cellulose, and a sub
stance selected from the group consisting of urea and
random orientations, thereby adhere considerably to one
urea derivatives, the content of methyl cellulose in said
another at their points of contact. This produces a fabric
solution being greater than that of any of the other in
like structure, though unwoven, which exhibits the de
gredients.
sired properties: It is absorbent and posssesses satisfac
2. A process, as recited in claim 1, in which a harden
tory mechanical properties, which it retains even in the 55
ing catalyst is incorporated in the aqueous solution.
presence of moisture or water. In the invention the high
3. A process, as recited in claim 1, in which the aqueous
breaking strength in the wet and the dry state is achieved
solution is sprayed onto the ?bres while in a state of sus
with a coating that is so thin that the end product pos
sesses satisfactory pliability.
If an especially soft feel is required, the ?brous ma 60
terial’s feel may be improved in the known manner by
pension.
References Cited in the ?le of this patent
UNITED STATES PATENTS
adding glycerol or similar agents. One ‘advantageous ap
plication of the process covered by the invention is that
the ?bers are processed in a state of suspension during
65
?ocking or carding.
Another application is treating merely the surface of
2,270,180
2,339,562
2,400,533
2,462,253
Bass et al _____________ __ Ian.
Eustis _______________ __ Ian.
Buf?ngton ____________ __ May
Booty _______________ __ Feb.
molded structures made of ?brous material with the proc
ess of the invention.
2,610,138
Heritage _____________ _._ Sept. 9, 1952
2,613,167
Cone _________________ __ Oct. 7, 1952
It is often necessary and desirable to impregnate the
70
product in one way or another, care being taken that the
more volatile substances do not escape prematurely. In
13,
18,
21,
22,
194
1944
1946
1949
FOREIGN PATENTS
766,798
Great Britain _________ __ Jan. 23, 1957
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