DE1422899A1 - Photographic film - Google Patents

Description

V? 5HI
P 1 422 899 O DIPL-fiV.O. C Λ «ri Braunschweig, 8th time in 1968

ΙΙ

PATEMT Λ ii ι / ii LTI
33

• Gevaert Photo-Producten ^^ f ^ kJrtsel (Antwerp) Belgium -Septestraat 27

Photographic film
Priority: Belgium from 14 "May 1962 (t: r. 41 652)

There is a peel-off film, often also referred to as "stripping film" mainly composed of a photosensitive halogen silver emulsion layer, which is on a thin backing called a permanent backing. »This backing is removable placed on a thicker support called a temporary support. On the other side of this temporary carrier ". -Can Depending on the use of the release film, other layers such as a matt backing or an antihalation layer to be present"

The release liner by which the temporary and permanent supports are adhered to one another must be such that they these two carriers during machine cutting that

IT treatment in the photographic baths and others

"V ^ keeps edits tightly bound together,

σ, The temporary and the permanent carrier are not allowed to

^{Stick the OT} together tightly, because separating the temporary support from the permanent support after treatment in the photographic baths would give rise to great difficulties. BAD OfttölNAl »

New documents (Art. 7, Paragraph 1, Paragraph 2, No. 1, Clause 3 of the Amendment Act of 4. "9.1967).

The object of the invention is now to create a dimensionally stable, peel-off film suitable for assembly purposes in Kepro technology without actual peel-off layer, in which the adhesion of the two supports before and during processing of the film on the one hand and their separability after the treatment of the film in the photographic images, on the other hand, that is, two contradicting one another Conditions that are optimally coordinated for practical purposes »-

Numerous release films are known, such as the one according to the American patent specification 2,633,417, which still contain peel-off layers »Through this further layer the structure of these decals is more complicated, what. also hers Makes manufacturing more cumbersome »

From the British patent 635 171 itt a release film, known in which the permanent support can be directly connected to the temporary support = - This patent does not contain any information about the composition, the. must have both carriers, = to allow this construction at all in from. British patent specification SS5 95c. Peel-off film is unsuitable for assembly purposes because of the inadequate dimensional stability of its permanent coating (after removal of the film carrier).

This is where the invention creates. Remedy =

8 0 9 8 0 ^{5/0 8 1 4 BAD 0RiG! NÄL}

The photographic release film of the present invention, its laterally urgent Backing with the permanent backing with no release liner is in direct contact 'and on its permanent support, connected by an adhesive layer, a light-sensitive Halogen silver emulsion layer is characterized in that the temporary support is in on known way from a hydrophobic cellulose ester layer and the permanent carrier from ethyl cellulose and Cellulose nitrate in a weight ratio of 1:19 to 1: 1 consists "

The adhesive film according to the invention is primarily used for Mon-cage purposes in reproductive technology are considered, as well for the manufacture of gravure forms and for the production from. Screen printing stencils o

For coating a temporary according to the invention Carrier made from a hydrophobic cellulose ester with a layer that doubles as a peel-off layer and a permanent carrier one proceeds as follows: one loosens C, 5 to 5 'file Ethyl cellulose and 9.5 to 5 parts of cellulose nitrate in one q common solvent, preferably methanol or a K: '.. i.cnun> · "· of solvents such as ethanol and dialkyl ethers, eic ae: i cellulose ester hydrophobic temporary carrier richt quelle.-j makes. You can use this solution in small amounts ■ each; tarid parts such as polynitrostyrene, maleic acid, etc.

add to the viscosity «. This solution will in such amount on the temporary support

8 0 9 8 0 ^{5/0 8 U BAD 0RlGINAL}

- 3 -

applied that one ethyl cellulose / cellulose nitrate'-. A layer of about 10 μm thickness is obtained. This layer can be applied all at once, mostly using the dipping method, but also in different times by applying very thin skins to one another, mostly using the roller coating method. In this last case it is possible to change the ratio "of ethyl cellulose to cellulose nitrate" for each or some of these thin membranes. """".

An adhesive layer and a light-sensitive halogen-acid emulsion layer are applied to this ethyl cellulose-cellulose layer. condensed. Material, because one replaces two layers with one ^, and consequently also a simplified process ^ zu · -; __-. - Manufacture of this material. . .

The release film according to the invention shows very good adhesion properties of the temporary cellulose ester carrier to the ethylellulose-cellulose nitrate layer. However, this adhesion is not too strong either, so that it is still very possible. i§t to remove the temporary carrier at the appropriate moment. '.''''*"/"' ·. · ..

The following examples explain this invention "-

Example 1 .;

The following solution is made up: _T "'· Cellulose nitrate 40 g

Ethyl cellulose,: - 6g

'809805/0814 bad original

Ethanol 700 cm3

Diet & yl ether ■ 300 cm3

The cellulose nitrate used has a K value of 30 = this K-Merrt was made into cellulose according to the Pikentscher formula chemistry »Volume XIII, 1932, p. 58 determined»

The ethyl cellulose used has a degree of substitution of 2.45 on. Ethoxy groups »A 5% solution of this ethyl cellulose in. a mixture of. Toluene and ethanol (SO / 20) has at 25 ° an ¥ isosity of 50 cP. After diluting the solution up 1Ο5 cP with a mixture of ethanol and diethyl ether (7: 3) oils found solution after the immersion process on a common one. Cellulase triacetate applied so that after Drying a peel layer (at the same time permanent carrier) of XX | ϊ bead receives «. . -

On: this release layer is applied according to the roller coating method Apply an adhesive layer from the following solution:

water

gelatin

25 % solution of salicylic acid in ^ methanol

Methanol

100 cm3 26th G 50 cm3 2450 cm3 1200 cm3

This S'crEjd-Cfet. is applied in such a way that one can with 1 liter - 35 square meters coated.

, BAD ORIGINAL

8Q98Q5 / 08U

\ P '■. · ■■■■ -.

After drying, a G is applied to this adhesive layer _; el-atine halogen silver emulsion layer applied =. _3Cj i

One receives in this way a Abziehf ILM with a _aus, _Ge,; -. _r , drew adhesion -between, the temporary- carrier and the. _: . <Remaining part of the release film »But you can, at the right moment, effortlessly remove the temporary support from the release layer. .. -... <

Example_ 2 '·. "'.

The following mixture is made:. ;

Cellulose nitrate (as in Example 1) 120 g

Ethyl cellulose (as in Example 1) 18 g

Ethanol 700 cm3

Diet hyether. 300 cm3

The viscosity of the mixture is brought to 24,000 cP by adding a mixture of ethanol and diethyl ether (7: 3). A cellulose triacetate carrier of 120 ρ thickness is coated with this mixture so that, after drying, a peel-off layer (simultaneously remaining carrier) of 11 ρ thickness.

This release layer is applied according to the roller coating process an adhesive layer of the following solution is applied:

Water "'-" ■■ "- ■" - "" ■ - ■ -.- .. ... ■ _; ; -, 1000 cm3. - 'Gelatine ■ ■ ;: .-. / - --.--. , ..-_ ■., _F 25 g

25% solution of salicylic acid in - ■ ..-- ·.. -,., - methanol., '50 cm3

0 5 / 0-8-1 4 -; lAö ORIGINAL

Methanol. 2450 cm3

Acetone 1200 cm3

The solution is applied in such a way that 1 liter 35 Square meter coated.

After drying, a gelatin halide silver emulsion layer is applied to this adhesive layer applied.

In this way, a release film is obtained with excellent adhesion between the temporary support and the remainder of the part of the release film. But you can use the temporary carrier in effortlessly remove from the peel layer at the right moment » This release layer now serves as a support for the photosensitive emulsion.

Example 3

Example 1 is repeated.However, the following solution is used to create the permanent support: Cellulose nitrate (K value: 30)

Ethyl cellulose (degree of substitution of ethoxy groups: 2.45) Ethanol "diethyl ether

• This solution is mixed with a mixture of ethanol and diethyl

• ether (7: 3) diluted to a viscosity of 105 cP, whereupon they are dipped onto the cellulose triacetate carrier

• is applied in such a way that after drying a permanent

'Carrier of 11 u is obtained.

. 809805/0814, BADORlQiNAL

20th G 20th G 700 cm3 300 cm3

B_ei_spiel_4_

Example 1 will again be HoIt. For the 'creation' of the permanent However, the following solution is used for the carrier: Cellulose nitrate (K value: 30)

Ethyl cellulose (degree of substitution , an .ethoxy groups: .2,45), "■.; .._- ;.

Ethyl ether _: .--.: .-. _: ■ ..., _. \ _. ■ _.-.-.

.: vn-butanol- .-: ■ · .; ■. - ... ■■ -.,. _{: i} .

This solution is made with a mixture of ethanol and Diftthyläther and n-butanol (13: 6: 1) are diluted to a viscosity of 105 cP, whereupon they are applied to the Cellulosetriacetatträger.vergossen that after drying a permanent support of 14 u thickness is obtained.

38 G 2 G 65.0 cm3 ..-- 300 cmß - 50 cm3-.

-809805/08 U

■■ · ■ y - \ ■■■■ '■ - ■ - ■ - ■ · ^{; ;} SAT ORiQi NAL

Claims (1)

P at ent entitlement Photographic release film, the temporary support of which is directly bonded to the permanent support with no release liner Is in contact and on its permanent support, connected by an adhesive layer, a light-sensitive halogen silver emulsion layer, characterized in that the temporary carrier is made in a manner known per se a hydrophobic cellulose ester layer and the permanent Carrier consists of ethyl cellulose and cellulose nitrate in a weight ratio of 1:19 to 1: 1 « Neil © Uniericgen {Art '■ -ύζ 2 no, 1- Sat: T res Airbruriowe :, ν. I 9 > ·. · / - ⁹ Γ 8098.05 / 0814