DE2030868C - Sheet material for the thermographic production of color projection transparencies - Google Patents

Description

1 2

! • ic I rliiuluii'j helrilft HI.tllnKUt.-ri.il / nr thermo-heluulen. The white coating “I painted the first

jj r: ι ρ 11111.11 c-11 ι IciMflliiiiL 'from I .1 rlipro juk I ion-iLÜn t.h- linduiiü from cm er solution in a volatile, lliiisun

They are sealed in a layer on a protonic carrier, which is not a solvent for the Vm \ lchloi ι.

h.ireii. farhMiiffhikleiulen I arhvorlaufcr in a polymer of the first coating Lsi, aiilyetragr.

V m> LhliTidpo! \ Merisal-Hindemiitel. Has ltIiikIliii ü> - S (leinäl.t the Liliiulung thus becomes a Hlaltmatci;

painted Hlaiini.iienal leads / u Pr ₁ 1 jck t! > in-el Lirchiich ι- to theniiographical production !!!? we L, π

biklerii. ei ic special in the head pro | ector ut- projektionsclurchsiehihildeni with an er-der Schi.:. ¹

can be spiral. on a prolonizable. dye-forming lan

The production of Kirhdurchsichihilder.i für Jil- vorlaiifenn a Viinlchlondpolynierisat-ßindemiii

Projection im known. Provided in the I ISA. patent specification io / ur, which is thereby marked

.MN. ^1st Uli dated December 4, 196 ¹ ) is one of two. that e * continues to send one to the first layer Ic-;

Scrolling existing systems described, with a gi! Uiiulenen coating, which in the we .-. Entlicin ·

Acid breakdown in heated bicarbonate areas from 4t) to 95 percent by weight nitrocellulose, 5 hi

from a lilatt having an acid source to 50 percent by weight of a plasticizer for di

a transparent, recording sheet on therniographi- 15 nitrocellulose and 1 to 25 percent by weight one:

Seem ways is transmitted, whereby the absorption with the color precursors convertible organic

sheet consists of a reproducible, chromogenic, coloring acid.

forming color precursors in solution in a vinyl Adequate adhesion to vinyl chloride polymer

contains chloride polymer; a colored projection merisate usually requires either a

image is preserved. The previous surface treatment containing the acid source or the em-

Sheet is then removed. For the projection, a solvent that the polymerc

cigncte color transparency retains both the color surface capable of attacking, in the second over-

sciner image areas as well as the original clarity. It was found that by using it

of the substrate with longer exposure below that of nitrocellulose as a film-forming binder for

Overhead projector. 25 the second coating is possible, the required

The present invention achieves a similarly high bond strength to the first vinyl coating, with regard to the durability of the chloride polymer, without any image or background, but in a simplified manner, prior treatment, according to the invention Both the acidic application of a solvent for the nitrocellulose-containing layer and the layer with the 30 used, which is always inert to the vinyl film full-color precursor in a single, uniform sheet. z. B. methyl alcohol,
be combined. Line color-forming reaction Unfavorably, the organic acids provided as part of the reaction between the two reaction participants tend to crinkle when the sheet is heated, ie during thermal installation from a nitrocellulose binder and graphic copying processes. The additional 35 to form light-scattering, crystalline costs as well as the inconvenient laying on top of one another and separations within the film, or the taking apart, which is required in sweating from two sheets or in forming a "bloom" on an existing system, are eliminated. the surface. In each of these cases the clarity is shelled. A colored transparency with a long product life is diminished and the projection life of the image is preserved. 40 worsen L. This effect is even with the mini

From the German Offenlegungsschrift 1 471 658 paint concentrations of acid can be determined, the

is also a thermosensitive material in sheet- are required to have acceptable color formation

form for the tlierniographischc reproduction of ; i. B. with only 1% salicylic acid. At higher

graphic originals known, the dye-forming content increases the crystallization effect.

Color precursors and acids in the form of one in one 45 It has been found that the plasticizer for the

Binder suspended mixture in a heat- nitrocellulose prevents the crystallization of the acid,

sensitive layer contains. This layer is through without deteriorating the bond to the vinyl resin,

have the coexistence of the dye- Both the plasticizer and the acid

forming color precursors and the acid at least a softening and tackiness

Not colored, especially if the reaction composition has an increased effect on the nitrocellulose

ncntcn have only been used at moderate temperatures and they cause an undesirable one

require elevated temperature for implementation. Absorption or transmission of fibers or printing

This laid-open specification also does not describe color particles from printed originals during

l'projection transparencies. The carrier for the thermographic copying process, if they

The heat-sensitive layer can be used in moderately large amounts in this known 55. Particle

Copying material made of paper or a film, or fibers that irt colored image areas

and the preferred material contains opacifiers, which are embedded, cause scattering or

like /. B. titanium dioxide. absorption of the light beam, whereby on the projection

Accordingly, the object of the invention is to obtain a dark image on the screen,
reasons to use a sheet material for thermographic production of the sheet material according to the invention for the transparencies obtained are resistant to a premature reaction to continuous exposure in the overhead projector for several hours between the two implementation participants without significant fading that is avoided and the clear, transparent and colorless image or discoloration of the subsurface. She is. This object is achieved according to the invention in that the copy remains both on the image and on the background, since the sheet material is in a permanent area. The transfer of material of the two-layer structure and the colored coating to the original or the layers in the separate layers would take away from fibers or printing ink particles

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(I IlL ι ι .lei, I hcr / iiL '' ■ .erf.ν ι iiiieJen. I. . .CUM I .11 D. iirla .111111 : i liiellv.lj-ps ι ι Ip-, I. ..!. '.'. ιΓ. li-IVielll.:- λ ie ■ I ί Λ.-patent- · ..; I ir. . i..rbiL'iies HiId m. No. ■ the naJi the I the ■ .ι i ".i [-ind

tan
Strii

<'C
Il Il

lien. The color precursor no.
irmel

= - (with the

C-C

H H

rat '! he mentioned USA patent) wai.delt lid. -If an initially pale yellow turns into an intense yellow, or the same color is obtained under Ve; - Development of an initially essentially colorless O matderivative of the material X4405. Mixtures of the protonizable color formers can be used vi! ¹ Ti to obtain color images with any desired intermediate | di \ "for projection.

i ..., -viii used in the example below; ihar /. is a copolymer of 87 parts of Viii, chloride and 13 parts of vinyl acetate. Other neutral polymensates made from monomers, of which at least 75% but not more than 95% are vinyl chloride, are also suitable. If it is coated on a cnifernbaren carrier Viir.ipolymerisaifilm containing the color precursor TCLL ■ ■ 'can serve as a support, it is preferably permanently jcdodi from a separate, wärmebesiändigen FiIm ₁ example, the Polycsterfilm gemäDdiesem example worn. About 15 to about 45 parts of resin can be used with 1 part of the dye-former for these coatings.

S-chlorosalicylic acid used in the example below is a preferred acid. Other suitable acids are, for example, benzene. p-aminobenzoic acid. Citric acid, cyanoacetic acid, gallic acid, salicylic acid, 5-bromosalicylic acid and 2,4-dichloromaleic acid, acids with a pK »value between 2 and 5 are generally effective. The acid must be soluble in the nitrocellulose solution and it should be kept at temperatures which are at achieved the thermogniphic copying process melt or, preferably, volatilize.

Although both solid and liquid plasticizers can be used, one gets with polymers. non-migrating materials the maximum stability, so (iaIi these are preferred.

The plasticizer must be confidential with the nitrocellulose win. solubilize the acid or theirs il. I Ml ilcin '.ιΤ. \ Ί1.Ι -.' I en Γ ■. ill If Iv I ι L-Γ Il n'lll.llf Il

Il'i lll.illc-, mi ■. ·. Cicnl lichen

I'lllv \ Ills ll) il! \ R.ll

c.'ckhiinni! .linu.irH "" '. wii IicjcikIc li.'i-, picl '.er-α effective, iedn-Ίι -.ι η. I .tu. !

I ι l-'l ilii - .. ι I H in ■ -1. · Ι 1111 ■ · t'_ 'ι Ii

■ '' ■ nln! hill IcI Ii ι-, Ik Ί .flh

I .1L ¹ Ci um; ι π ill \. r .ι. ei: .iniit!

illi.lil lllkilll). ' -.ClIl. -Mk. . 1Ί ι 111 (11111 ■

'·!.! mi I I.iii.Il ¹ I niik :! iici

ί ii.illli. .1. Il unit In J.

· ■ i.i -ι '-> nr.lc. ι ·, ι liL-M ι η ι Ic i

in.IlTl- kl.ii-.cn win v \ ei Jim κΊκι η hr.iuJih.ir. . '. Ii l '.' L .c-, icr · '. ^; c ilcr imlcr, 1st T IL '/ cijhining'il'arapL ¹⁴ . '. i- (i2.

i "im liaiiiJcl erhalilkhc l'iihestcr. PoKaIk) leiiuK knee. uie il.is in the II.iiiJl-I line of the lic / cichniini! "He \ ul H-4UH.I L-rhälllicliL · Malen.ti iihlI camphor.

HiL capability de- coated blue, wahreiui No material for the il-cut graphical cropping process

ij or on / unehnv; n can be conveniently done with the help of a simple te> is ermiiieli. A heated metal plate with a known, ^emlan ß ^its surface co-; iniiierlidi increasing surface temperature, ι. B. a heating bank, is called

jo heat source used. The transparent, coated Film is placed against a printed original, and both then become evenly long for 10 seconds .cn hand pressed lightly against the metal surface, then removed and cooled. Slow peeling

as of the film from the original under continuous observation then shows the point at which gluing. Ingestion and delivery of material occur first; the corresponding temperature is determined based on the position of the film on the heated surface.

Leaves that show no such damage at up to about 160 C or preferably up to 190 to 200 C, are for use in thermal copying processes fully satisfactory.

Using the test described, it has now been found that coating compositions according to the invention, which are therefore 1 to 25% or a little more or preferably 5 to 15% acid, 5 to 50% polymeric Plasticizers and 40 to 95% nitrocellulose contained, and which continues in the shaded area of the Triangle diagrams of the proportions of falling, well-bound, non-crystallizing and heat-resistant Top coats on the vinyl halide polymer layers described here, which are either are on a carrier or do not have a separate carrier to be able to form Obtain a uniform copy sheet material that produces clear, transparent, permanent color transparencies can be produced for projection.

The process of making d; s Blattm tu-riaU for the thermographic production of color projection transparencies according to the invention is characterized in that a clear, transparent, heat-resistant film base with a

liquid coating compound, which has a protonizable, dye-forming color precursor and a polymer of monomers, 75 to 95% of which is vinyl chloride, in a volatile, contains liquid carrier, the coating is dried.

'■ >> a second layer of a liquid coating composition applying from 40 to 95% nitrocellulose, 5 to 50% softener and 1 to 25% of an organic acid dissolved in a volatile liquid carrier which fiir the polymer is not a solvent includes, ,

and one the second coating under conditions dries, which prevent a noticeable reaction / wipe of the color precursor and the acid.

In the drawing, F. points A. N and. "

read I) ri'icck> in each case | (l (l I rapid acid or nitrocellulose or plasticizers d; ir.

The I> ii rc ΙιΓϋ hi ti πμ der I ilmdting is illustrated by the following example. with all of the tasks involved. falK flour under-, stated, refer to the ' icwichl.

example

IO

line ersle I ösiing is made by adding I (eil I a rh precursor (N- (IJis- (4-dimellnlaminophenyl) -methy l | -py rrolidon) and 20 Ίeile Vmylpolymensat in d9 parts of methyl ethyl ketone are dissolved, if necessary a small amount of a 5 "solution of potassium hydroxide in ethanol is added to obtain the pll-Wcrt to cheap on 7 / u. The solution will be on one kl.iren. transparent. 0.05 mm thick pclyalky lentercphlhalaililm evenly applied thickly, that after the '! mean a (reference weight m ν on 4.9 g in 'results.

I ine / while solution, the 4 I hurry ', -ΝιΛιιικΙυ-Νιΐιο-cellulose (i.e. Nilrocclhilose certain low viscosity, defined by the duration of the solution [see. hicr / u A.. 1 ο η e s, »Cellulose I acqucrs, I mishcs .i! - .: '".iiifiit:,« ·. 1 ippincott. WX. S. I4 (i |). M eil alcohol-soluble poly viny Ihuly ralharz and 1 part 5- (hl (> rsalic \ lic acid in 21 files contains n'elhvl alcohol, is applied over the first layer and at Room temperature dried. The dry weight 3 " the / while shift is 4..1 g m-.

The coated IiIm is clear and colorless. It will with the coated surface against the printed one Surface of a graphic original, which then briefly passes through the HIm with intensive IR-Sirahliiiu ·. in a thermal copier is irradiated. On the copy sheet, there will be an intense, clear, blue image corresponding to the printed IJiId generated The watt is converted into a (brought overhead projector, and when projecting a hlaugrimcs appears on the display screen UiId on clear I'ntorgrimd. The visible pattern remains essentially unchanged for several hours of continuous projection.

Claims (5)

Patent claims: 1. Waitmalcrial for the historical production of skin projection transparencies with a first layer of a ionizable, dye-forming precursor in a full-blonde hood. dad 11 rc Ii g ek e η η ζ eic Ii η e I. that there is still a coating that is firmly bonded to the first layer and which consists essentially of 40 to ⁽ > 5 (weight percent nitrocellulose, 5 to 50 weight percent a plasticizer for the nitrocellulose and 1 to 25 (weight per cnl) of an organic acid capable of reacting with learning precursors. 2. Sheet material according to claim I. characterized in that that the first layer has a transparent transparent layer as a permanent support. heat resistant PoIv merisatlilm has. }. Sheet material according to claim 2, characterized in that the plasticizer is a non-migrating, polymeric plasticizer. 4. Sheet material according to claim i. characterized in that the plasticizer is polyvinyl butyral. 5. sheet material according to claim 4, characterized in that that the acid is salicylic acid. (1. A method for producing the sheet material ^ according to claim !, characterized in dal ¹ was a clear, transparent, heat-resistant I ilmuntcrlage with a liquid Oberzugsma ^ coated which a protonisicrbaren. Far ,. stoffbildcnden color precursor and a polymer of monomers of where 75 to 95 _"n accounts for Vinvl chloride, containing, in a volatile liquid carrier that one dries the (jherzug that a second layer of a liquid · - (iber / iigsmassc applying from 40 to 95 °" nitrocellulose . 5 to 50 ⁿ / a "softener and I to 25" of an organic acid dissolved in a volatile: 'liquid rager which is solvent U-for the polymer contains, and Dall to i </ wide coating tiockiu under conditions ·!.! : soft prevent a detectable reaction between the precursor and the acid. 1 sheet of drawings