Material for direct offset platemaking by using laser printer

FIELD: printing industry.

SUBSTANCE: invention relates to polygraphic consumable materials and can be used for production of film offset printing plates. Material has a polyethylene terephthalate film as a base on which an adhesive substrate and hydrophilous receiving layer are applied. The adhesive substrate includes polyvinylpyrrolidone, vinyl acetate copolymer with vinyl chloride and trichloracetic acid with the following ratio of the components, wt %: polyvinylpyrrolidone with 12600±2700 - 2.50÷66.66 of molecular weight, vinyl acetate copolymer with vinyl chloride - 5.00÷75.00, trichloracetic acid - 16.67÷75.00. Hydrophilous receiving layer includes polyvinyl alcohol, filler - kaolin, or iron oxide pigment, or their mixture and glutaric dialdehyde with the following ratio of the components, wt %: polyvinyl alcohol - 16.26÷33.11, kaolin - or iron oxide pigment, or their mixture - 63.49÷83.06, glutaric dialdehyde - 0.33÷4,76.

EFFECT: adhesion enhancement of layers that leads to efficient increase of run length.

1 tbl, 12 ex

 

The invention relates to a consumable printing materials, in particular material on a flexible basis used to obtain the offset printing plates by printing on a laser printer.

The invention relates to adhesive sublayers obtained by applying solutions for PET-based and their subsequent drying.

Known material on a flexible basis used for direct production of offset printing plates using a laser printer [1]. He was selected as a prototype. A known material can not achieve reprinted printed form more than 500 prints.

The aim of the invention is to increase the run length of the printing form not less than 1000 impressions. This goal is achieved using as the basis of polyethylene terephthalate (PET) film, which are sequentially deposited adhesion layer consisting of polyvinylpyrrolidone (PVP), copolymers of vinyl acetate with vinyl chloride (WASH) and trichloroacetic acid (THU), and the receiving layer consisting of polyvinyl alcohol (PVA), filler (kaolin, iron oxide pigment, or a mixture thereof) and glutaraldehyde, in the following ratio, wt.%:

adhesive sublayer:

PVP (mol. weight- 12600±2700) - 2,50-66,66

WASH - 5,00-75,00

THU - 16,67-75,00

the receiving layer:

PVA - 16,26-33,11

filler - 63,49-83,06

the GLA is steam aldehyde - 0,33 was 4.76.

A comparison of the proposed technical solutions to the prototype allowed us to establish compliance with a criterion of "novelty". The study of other known technical solutions in this area [2] the features distinguishing the claimed invention from the prototype, were not identified and thus provide the claimed technical solution according to the criterion of "significant differences".

Examples of specific performance.

Example 1 (prototype).

On waterproof paper with a weight of 100 g/sq.m cause the composition of the sublayer of the following composition, wt.%:

50%latex carbauxilirovanny23,30
10%aqueous solution of starch19,42
a 50%aqueous dispersion of Cislita38,84
80%aqueous solution of melamine-formaldehyde resin2,33
35%aqueous solution of catalyst0,58
water15,53

The applied composition is dried at 120°C. after drying, the mass of the substrate is 15 g/sq.m

On the sublayer is applied composition receiving layer of the following is the composition, wt.%:

synthetic silicon dioxide4,47
20%aqueous dispersion of colloidal
silicon dioxide22,36
a 50%aqueous dispersion of kaolin26,84
10%aqueous solution of PVA22,36
40%emulsion of acrylic acid with vinylsilanes1,12
80%aqueous solution of melamine-formaldehyde resin0,27
10%aqueous solution of ammonium chloride0,22
water22,36

The applied composition is dried at 120°C. after drying, the weight of the receiving layer is 8 g/sq.m.

Printed forms get on a laser printer Laser Jet. Definition reprinted printed forms, the resulting printed on a laser printer, hold for small-format offset printing machine, Hamada RS-34 (format printing form 297×492 mm).

The results of determination of the duration shown in the table.

Example 2 (comparative the first).

PET the basis of a thickness of 100 μm is applied to the composition of the substrate and the receiving layer of example 1. Receiving the printing form and the determination of its durability spend the same way as in example 1.

Example 3 (comparative).

PET the basis of a thickness of 100 μm is applied to the composition of the underlayer of example 1. On the sublayer is applied by the method of watering the composition receiving layer of the following composition, wt.%:

PVA - 2,83

iron oxide pigment - 2,48

kaolin - 7,44

glutaric aldehyde - 0,23

water - 87,02

After drying receiving layer has the following composition, wt.%:

PVA - 21,80

filler - 76,43

glutaric aldehyde - 1,77

The thickness of the receiving layer after drying the applied composition for 30 minutes at 100-110°C is 4-6 μm. Receiving the printing form and the determination of its durability spend the same way as in example 1.

Example 4.

In a mixture of 30 ml of acetone and 7.5 ml of ethyl cellosolve was dissolved 2 g THU, 0.6 g of PVP and 1.4 g of a copolymer of vinyl acetate with vinyl chloride (WAWH) (THU ratio to polymer is 1:1, the content of PVP in the mixture of polymers - 30%), by composition of the adhesive layer of the following composition, wt.%:

PVP - 1,73

WASH - 4,03

THU - 5,76

acetone - 68,30

the ethyl cellosolve - 20,18

Applying the adhesive composition layer (sublayer) spend on PET base with a thickness of 100 μm. After drying the adhesive layer has a trail of the managers, wt.%:

PVP 15,00

WASH - 35,00

THU - 50,00

The obtained adhesive sublayer is applied composition receiving layer of example 3. Receiving the printing form and the determination of its durability spend the same way as in example 1.

Example 5.

PET the basis of a thickness of 100 μm is applied adhesive sublayer of example 4. His cause composition receiving layer of the following composition, wt.%:

PVA - 2,98

iron oxide pigment - 5,95

glutaric aldehyde - 0,06

water - 91,01

The receiving layer is dried as in example 3. After drying it has the following composition, wt.%:

PVA - 33,11

iron oxide pigment - 66,23

glutaric aldehyde - 0,66

Receiving the printing form and the determination of its durability spend the same way as in example 1.

Example 6.

PET the basis of a thickness of 100 μm is applied adhesive sublayer of example 4. His cause composition receiving layer of the following composition, wt.%:

PVA - 2,70

kaolin - 13,51

glutaric aldehyde - 0,41

water - 83,38

The receiving layer is dried as in example 3. After drying it has the following composition, wt.%:

PVA - 16,26

kaolin - 81,30

glutaric aldehyde - 2,44

Receiving the printing form and the determination of its durability spend the same way as in example 1.

Example 7.

PET the basis of a thickness of 100 μm is applied adhesive sublayer of example 4. On it put the comp is the position of the receiving layer of the following composition, wt.%:

PVA - 2,71

kaolin - 6,78

iron oxide pigment - 6,78

glutaric aldehyde - 0,05

water - 83,68

The receiving layer is dried as in example 3. After drying it has the following composition, wt.%:

PVA - 16,61

filler - 83,06

glutaric aldehyde - 0,33

Receiving the printing form and the determination of its durability spend the same way as in example 1.

Example 8.

PET the basis of a thickness of 100 μm is applied adhesive sublayer of example 4. His cause composition receiving layer of the following composition, wt.%:

PVA - 2,97

kaolin - 2,97

iron oxide pigment - 2,97

glutaric aldehyde - 0,44

water - 90,65

The receiving layer is dried as in example 3. After drying it has the following composition, wt.%:

PVA - 31,75

filler - 63,49

glutaric aldehyde was 4.76

Receiving the printing form and the determination of its durability spend the same way as in example 1.

Example 9.

In a mixture of 30 ml of acetone and 7.5 ml of ethyl cellosolve was dissolved 0.4 g THU, 0.2 g PVP and 1.8 g WASH (THU ratio to polymer is 1:5, the content of PVP in the mixture of polymers - 10%), by composition of the following composition, wt.%:

PVP is 0.60

WASH - 5,44

THU - 1,21

acetone - 71,60

the ethyl cellosolve - to 21.15

The coating composition of the adhesive layer is carried out as in example 1. After drying the adhesive layer has with EBUSY composition, wt.%:

PVP - 8,33

WASH - 75,00

THU - 16,67

The obtained adhesive sublayer is applied composition receiving layer of example 3. Receiving the printing form and the determination of its durability spend the same way as in example 1.

Example 10.

In a mixture of 30 ml of acetone and 7.5 ml of ethyl cellosolve was dissolved 6 g THU, 0.2 g PVP and 1.8 g WASH (THU ratio to the polymer is 3:1, the content of PVP in the mixture of polymers - 10%), by composition of the following composition, wt.%:

PVP - 0,52

WASH - 4,65

THU - 15,50

acetone - 61,24

the ethyl cellosolve - 18,09

The coating composition of the adhesive layer is carried out as in example 1. After drying the adhesive layer has the following composition, wt.%:

PVP - 2,50

WASH - 22,50

THU - 75,00

The obtained adhesive sublayer is applied composition receiving layer of example 3. Receiving the printing form and the determination of its durability spend the same way as in example 1.

Example 11.

In a mixture of 30 ml of acetone and 7.5 ml of ethyl cellosolve was dissolved 0.4 g THU, 1.6 g of PVP and 0.4 g WASH (THU ratio to polymer is 1:5, the content of PVP in the mixture of polymers - 80%), by composition of the following composition, wt.%:

PVP of 4.83

WASH - 1,21

THU - 1,21

acetone - 71,60

the ethyl cellosolve - to 21.15

The coating composition of the adhesive layer is carried out as in example 1. After drying adhesion the first layer has the following composition, wt.%:

PVP - 66,66

WASH - 16,67

THU - 16,67

The obtained adhesive sublayer is applied composition receiving layer of example 3. Receiving the printing form and the determination of its durability spend the same way as in example 1.

Example 12.

In a mixture of 30 ml of acetone and 7.5 ml of ethyl cellosolve was dissolved 6 g THU, 1.6 g of PVP and 0.4 g WASH (THU ratio to the polymer is 3:1, the content of PVP in the mixture of polymers - 80%), by composition of the following composition, wt.%:

PVP - 4,14

WASH - 1,03

THU - 15,50

acetone - 61,24

the ethyl cellosolve - 18,09

The coating composition of the adhesive layer is carried out as in example 1. After drying the adhesive layer has the following composition, wt.%:

PVP - 20,00

WASH - 5,00

THU - 75,00

The obtained adhesive sublayer is applied composition receiving layer of example 3. Receiving the printing form and the determination of its durability spend the same way as in example 1.

Table
The results of the tests reprinted printed forms
# example12345678 9101112
The length, the number of prints50011200010001300100015001000200010001500

According to the data given in the table, use in film printed forms sublayer prototype (examples 2, 3) can produce such forms no more than one impression. This is due to very poor adhesion sublayer prototype to PET-based, which leads to delamination of the receiving layer with the underlayer from the basics already receiving the first impression. Proposed composition of the sublayer provides high adhesion of the receiving layer with PET basis, and the proposed composition receiving layer provides the desired print quality up to 2000 impressions (in particular - the lack of "samaritane" white-space elements). With the minimum content of THU (examples 9, 11) partial exfoliation of the receiving layer is observed only after receiving 1000 prints. The same result is obtained when the minimum content is in the receiving layer glutaraldehyde (examples 5, 7). The increase in the content of THU leads to increased adhesion strength, and the increase in the content of glutaraldehyde to increase the strength of the receiving layer. These two factors lead to a significant increase in durability. The best results are achieved when the ratio of THU to polymers from 1:2 to 1:1, the content of PVP in the mixture of polymers from 20 to 50% and the content of glutaraldehyde - 5-10% compared to PVA. In this case, is reprinted (2000 prints) is determined not by the beginning of exfoliation receiving layer of the printing form, and the beginning of the destruction of small printed form elements.

Sources of information

1. U.S. patent (prototype) No. 4686138, MKI G11, 1987.

2. U.S. patent (similar) No. 5353705, MKI VS, 1994.

The material for the direct production of offset printing plates using a laser printer, consisting of a flexible base, and hydrophilic sublayer of the receiving layer, characterized in that, as a flexible framework use of polyethylene terephthalate film as a substrate using an adhesive sublayer comprising polyvinylpyrrolidone, a copolymer of vinyl acetate with vinyl chloride and trichloroacetic acid as a hydrophilic receiving layer using the layer comprising polyvinyl alcohol, the filler is kaolin, or iron oxide pigment, or a mixture and glutaric aldehyde in the following ratio, wt.%:
adhesion the first sublayer:

polyvinylpyrrolidone (mol. weight 12600±27002,50÷66,66
the copolymer of vinyl acetate with vinyl chloride5,00÷75,00
trichloroacetic acid16,67÷75,00,

hydrophilic receiving layer:
polyvinyl alcohol : 16,26÷33,11
filler63,49÷83,06
glutaric aldehyde0,33÷4,76



 

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