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Патент USA US2406558

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Patented Aug. 27, 1946
r 2,406,558
f Henry T. Neumann, New York, N. Y., assignor of
‘one-third to Leon G. Arpin, ,Montclair, N. J.,
and one-third to Edwar d L. Symonds, J ackson
Heights,‘ N. Y. _
'_ No Drawing. Application December 10, 1943, _
Serial No. 513,713;
. '. 1
which will hereinafter bereferr'e’d to'as the "ides
This invention relates to acrylic ‘resinswiand,
posit product,” is much softer'than Lucite. Also,‘
it"is,more‘,?exibl_el These two qualities-"render
the deposit product ‘a highly desirablecenient,
more particularly, to makinga by-vproduct from , ‘
acrylic resin scrap.
3 Claims. (o1. goo-ea)” ‘
' The principal object of ‘the invention’ is to- pro
vide a speedy, inexpensive and simple method of
' ?ller and lacquer.
Although benzene by itself will dissolve Lucite
scrap injtime, when used alone the dissolving
making a by-product from acrylic resin scrap
formed during the manufacture of acrylic resin
proceeds rather‘ slowly. I have found that the
concomitant use of alcoholigreatly' accelerates
Another object of the invention is to make as
a by-product from acrylic resin scrap anorganic 10 the dissolving action. Typical alcohols-effective
for this purpose ‘are alcohols of the aliphatic sat
solution from which there , is deposited upon
urated series which are solublein' benzene. Ex
evaporation of the solvent a substance capable
amples of these are: methyl'alcohol, ethyl al-co- ~
of serving as an improved cement, ?ller, binder,‘
/ A further object of the invéntionis to;provide 15'
hol,‘ propyl alcoholhbutyl alcohol, amyl-alcohol,
hexyl alcohol, laury-alcohoLA-cetyl alcohol, and
an improved organic cement capable of highly
effectively bonding articles made of acrylic resins‘
and which may be simply modi?ed to bond‘ well
useful since ‘they greatly facilitate‘ the dissolving
. ~
The methyl “and ethylalcohols are, particularly .
action and are obtainable commercially at-a very
with articles made of materials such as cellulose ,
20' low price. It should be notedthat these saturat
ed aliphatic alcohols are not capable by them-_
‘Another object of the invention isto‘provide a‘,
selves of dissolving Lucite. By way of example,‘
novel organic ?ller for?brous‘articles which ren
andwithout in any’ way limiting'myself thereto,
ders the articles self-form-Inaintaining to ahigh
acetate and cellulose nitrate. '
the following is a gOOd example'of a' solvent for
degreeLshock-proof, water impervious, and d¢_CO-.'
Another object of the invention is to provide
an improved flexible, Wear-resistant laccluerfthe
transparency of whose resultant coating canbe
dissolving Lucite ‘in accordance with my inven~
Ethyl alcohol ______ _-_‘_:_5____'___’__'~_V_scc__ 2000
Benzene __________________________ __cc_~_ 7000
acrylic acids, their esters, amides, salts} halides:
This quantity’ of the composite solvent ‘can-‘be
used to dissolve about half ‘a kilogram of Lucite.
It is also ‘capable of dissolving'larger quantities
of scrap, but the resulting organic solutionpf
polymeric methyl‘ methacrylate resin will .be
and nitriles. ,More‘ particularly the invention is
concerned with making a by-product from the
more viscous.
is used to dissolve 454 gms. or scrap,'the resulting
scrap acrylic resin known as ,“Lucite,” i. e., poly- -
solution will have the viscosity of molasses.
objects of this invention‘
‘ _ ‘ _ will
in part be‘
obvious and in part‘ hereinaiter'pointedyout.
The invention contemplates making a by-prod;
uct from scrap resins such as acrylic and meth
If the above 9000 cc.‘ of solvents ,
Preferably the Lucite scrap is ?rst immersed
the alcohol, then the‘ benzene is added. If the
Basically]: carry out 'theinvention by dissolv
ing the acrylic resin, such as Lucite, ‘in a volatile 40 procedude is reversed, that'is. if the Lucite is ?rst
added to the benzene and then alcohol isintrQ
organic solvent which may consist either of ‘a
a cottony precipitate will be formed of the
single solvent or a mixture of two’ or more’or-i
scrap already in solution. Of course, this cottony
ganic solvents. The resulting solution of Lucite
precipitate can be redissolved, but this requires
in an organic solvent may be applied to surfaces
additional time. If the alcohol is ?rst added and
to be cemented or coated, or impregnated'in a
then the benzene, from one to two hours will be
?brous material-and "allowed to dry‘ whereupon‘ a
required'to dissolve the 454 gms. of scrap. The
solid substance will be deposited whose degree of
meric methyl methacrylate resin.
process maybe carried out at ordinary room
temperatures. After the Lucite is dissolved,'it
' More speci?cally I dissolve the'Lucite scrap ‘in 50 is desirable to allow the viscous solution to stand
a while to permit homogenization thereof.
benzene. When this organicsolution ‘of Lucite is
translucency ‘Will vary’in accordance with the
composition of the organic solution.
This solution is one of‘ the end products'iObé
tained'from the reclamation of the Lucite scrap.
evaporate and deposit a horny, solid substance
It can be used as a cement or as a bond for sub
which is notLucite although it resembles the
same. For example, this depositedsubstance, 55 stances which may be softened by the solvent.
applied to an exposed surface,’ the benzene will‘
3 .
‘For example, this solution forms an excellent
becomes ?rst cloudy and ?nally opaque. Where
‘ bond for uniting Lucite parts.
the ratio is reversed-7000 cc. of alcohol to 2000
I have found upon tests that where two thin
cc. of benzene-the deposit product is quite
1 Lucite sheets are united by the foregoing solu
opaque, although its ?exibility and softness are
‘ tion the sheets fail before the bond.
'5 not materially affected.
The solution. can adaptedafor. use as .a.
Wheremy ‘novel solution is. employed. in clos
1 bond fonorganic‘materialS other thaniLuciteiuby
ing;v packages ofjfood, itis desirable- to 1 prevent
. addingranother solvent to the already formed
dirt and extraneous matter present in the scrap
1 solution, which solvent has. the property of~.-.
_ from being carried over into the solution. Par-'
,Wsoftening the material with which the solution 10' ticularly is this necessary where such dirt dis-1
l is to be used. Thus if glacial acetic acid israddédf
solves-in the solvents employed in my solution. I
Tothisend Luciteinay be dissolved inmy novel
solvent, vprecir‘iitatedfas by adding water, and the
precipitatezthen :redissolved in afresh solution
glacial acetic acid to be added can be quite widely i5 which includes benzene. Such freshjs'olution may
also include alcoholas described above.
i to the solution, the resulting new solutiomis an.
excellent bond. for substances's'ucli. as..cellulo'se..'
‘acetate and cellulose nitrate}, l The quantity of E .
I have found that highly 'satisfactoryiresultsf
fyAl-ternatively- Iv‘may employ, for the purpose
are obtained Whe're'the glacial aceticv iaci‘dxisr ‘*of‘Te'moVing the, impurities,» a solution of acetic’
gabout-ten percent byjvolume of ‘the originaLcom ; acid}, acetic anhydride and sulphuric acid, which
If. desired, larger
amounts of 20 willdissolve Lucite and” from which the same
- posite. solvent.
1glacial acetic.acidican.beemployed, but it must. ‘
‘ ‘ be; borne;' in. mind that. there' will..-be._a . greater,
. softening. of . the. material; ‘.Wliereulessth'an .ten
can -likewise be precipitated.-v .by V the . addition. of
. water. .
My novel solutioin of-L'ucite can be‘employed'
.3 per. cent of-glacialacetic a'cid._'iis used, fa..poorer'
bond is formed-
also. as a lacquer... If...the solution is unpigmented
I 25
The- bonding action of my.novfe1.,solution on
with‘pthealcoholand benzene. in the above spe-
‘ ci?ed. proportions, thelacquerwill be clear and.
uncolored.;. suitableipigments, . of. course-,. maybe
‘ substances such ascellulose acetateand’cellulose
‘ nitratecan be'further enhanced by adding, other
added. If'an'opaque or semi-opaque lacquer is.
: softeningfsolventsy in additioneto the glacial acetic
‘acid. .. Such another. solvent. is... acetone,_ which"
'desired,..the proportions of alcohol andbenzene
39. maybe changed.‘ accordingly- The lacquenthus.
can-be .added in-theamountbf about two. per
1 cent of. the original solution by. volume. Here
obtained? is extremely ?exiblean-d. is thus very...
desirable, since it will not chip andawill not break
‘. care . should be exercised .not. toaddi much. more
than -two:-per. cent- of; acetone‘; . otherwise- a‘ cot;
when the‘ surface to which .it is .applied is repeat- ‘
tony precipitatetwilltbeformed.
edly or sharply bent.
My solution of . Lucite=can also be. used for
fabricating self-[form-maintaining.?brous articles.
'If desired, the characteristics of. the; deposit
‘ product may be- modi?ed. torenderjthe Ib'ond Tmore
?exible by adding._-plasticizers, examples .of which ~
' fromlraw materialswhichare. essentially limp,
such as‘ paper and cloth. . Tomake a paper article,
{are dimethyl phthalate, dibutyl ltartrate, lactic
a. sheet of paper is-coated with the. solution and
3 acid,- phenolptha'lein, and .tricresylli phosphate. 40, the same allowed tosoakinto the paper, or the
, .. My-improved solution, a.-sur.—. 3 sheet, may, be; immersed in; the solution, with
i faceeexposed to .- air; dries..very. quickly- and .lthus.
drawnanditheexcess.solutionlallowed to run off.
‘ irapidly;leaves-,acthin. ?lm. of. the .deposit = prode
The surface of thesheetis then permited to dry
and..the'sheet.is1processed. to bring; it into the.
luct. Inesomeé, that
is; the‘ speed of drying7 is._.to0 :rapid,‘ andlundér 45 desired shape, such as a paper cup,‘ embossed
such conditions it is preferable to introduce into.
license..plate,- etc. After shaping, the. .paperds
' .
the solution a reagent for retarding drying. Any
permittedto set.. Ifzincchlbride is-usedasthe.
‘of the" foregoing- plasticizers will- function‘ satis;
retardanhfin, about one-halt. to two. hours, full.
setting will result, The paper article is, light,
Another; and very,ef?cientretardant. is zinc 50 resilient .and. will notv chip; It .is.v also. strong
fchl'orideic Witlnthe latter; thGrSOl-lllliOIliWlll take
fronr- about: . oneeha-lf: to; two .> hours. to . dry and‘
and impervious, tomoisture, althoughlflexible, '
enough not to :breakQeasily. .
Quite: often the acrylic. resin scrap includes 7
foreign matter of a. cellulosic nature such as a
I have mentioned: aboyeith'at: where? it; was.
desired:v to‘ increase; or. decrease the:~viscosity_ of :' 55 paper» backing» and it may beinconvenient to‘.v
V Ithesolutionmorezor. less Lucitei scrap should be"v
‘dissolved'ainv a' solution comprising, a‘ ?xed ratio
remove such. matterby ?ltering; I have found
thatlremoval. of cellulosic matter may beaccom
plished. by chemical treatment‘ and/the‘ treated
nary; practice. in dissolving. organic compounds
matter‘. incorporated . in the. organic: solution .of
wherein: if. a. less viscoustsolution: is employed, it 60 the-acrylic. resin without in any Way, affecting’v
of,twoor‘moresolvents; Thisvis contrary; to ordi
is common-to". add; more" of - the; dissolving agent
thezcharacteristics ofsaid solution.
I -
.onlyg'irt this instance zb’enzene~,zrather’than to.-in'-.
of. the;.-c_ellulosic :matteriseaccomplished as fol- ‘
‘creaserthezamounts of both-.tlie-benzeneend ale
coh'ohlthati is; of the‘zdissolving agentfandt the
A» mass of the-scrap, including, for example,
acceleratingzagenti- The: reason for: this is-;that~ 65 scrap with_~.a~p_aper backing‘; is .placed Vina crockv
IIhave‘ found thatzwhererth'es. ratio: betweemth‘e
and -:enough tof‘ a ?ve to ;ten percent solution .of
a'lcoholtand; benzene is; varied, the transparency . sodium asul-phide'ispoured into‘tthe crockwtoiml
‘of-T the‘: deposit product . varies correspondingly;
mersewthe scrap.- The‘scrap-is allowedto stand
Where benzene aliineis r-usedtjhe' depositproduct
in this solution for :f-rom twoto twenty-four hours.
is‘ip'erfectlyclearzand'transparent'. When:alcohol .70 The: sodium sulphide solution is‘ then poured off
is also. employednpv to the;~proportion- mentioned
and-the=:scrap1in~the tcrock. submersed in. a. five;
motile-foregoing; speci?c example; that is, two
to temper cent-solutionof sodium» bisul?te. The.
parts ; out of :'a total of. nine,. the deposit product
scrap‘: is, permitted to. stand ‘in. this. second. solu_is; stilli perfectly clear ; and: , transparent.
tion for from two to three .hoursafter which» itlis
‘even-asth'e ratio :increases; the-deposit product 75 poured. out .and the scrap Washed. in‘. water. to.
clear o? excess salts. The scrap is then dried
whereupon it is ready for dissolution in the
composite solvent hereinabove described.
The sodium sulphide gelatinizes the cellulosic
matter, in this instance the paper backing, the
sodium bisul?te sets the gelatinized backing and
the water renders the backing opaque. After
treatment with the sodium sulphide, sodium bi
sul?te and water, none of which affect the acrylic
resin scrap, the cellulosic matter is soluble in the 10
composite solvent along with the acrylic resin.
scrap and the resulting solution will have the
about from 2 to 3 hours in a solution of from
about 5 to 10% of sodium bisulphite, washing
the same in water, and then dissolving the scrap
and treated cellulosic matter in benzene and a
monohydric alcohol of the saturated aliphatic
v2. A method of utilizing scrap polymeric
methyl methacrylate resin including cellulosic
matter comprising treating the same for from
about 2 to 24 hours in a solution of from about
5 to 10% of sodium sulphide, next treating the
same for about from 2 to 3 hours in a solution
of from about 5 to 10% of sodium bisulphite,
Washing the same in water, drying the same,
It will thus be seen that I have provided a 15 and then dissolving the scrap and treated cellu
losic matter in benzene and a monohydric alco
method of making, as a by-product from Lucite
hol of the saturated aliphatic series.
scrap, an organic solution capable 01' many use
3. A method of utilizing scrap polymeric methyl
ful applications and which achieves the stated
same physical and chemical characteristics as the
solution of the acrylic resin alone.
methacrylate resin including cellulosic matter
objects of my invention.
As various possible embodiments might be 20 comprising immersing the same in a solution of
from about 5 to 10% of sodium sulphide, letting
made of the above invention, and as various
the same stand in said solution for from about
changes might be made in the embodiments'above
2 to 24 hours, next immersing the same in a solu
set forth, it is to be understood that all matter
tion of from about 5 to_ 10% of sodium bisulphite
herein set forth is to be interpreted as illustra
tive and not in a limiting sense.
25 and allowing the same to stand in said last named
solution for from about 2 to 3 hours, washing the
Having thus described my invention, I claim as
same in water, drying the same, and then dissolv
new and desire to secure by Letters Patent:
ing the scrap and treated cellulosic matter in
1. A method of utilizing scrap polymeric methyl
benzene and a monohydric alcohol of the satu
methacrylate resin including cellulosic matter
comprising treating the same for fromabout 30 rated aliphatic series.
2 to 24 hours in a, solution of from about 5 to 10%
of sodium sulphide, next treating the same for
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