DD203926A1 - PAPER COATING MASS - Google Patents

Abstract

The invention aims to simplify the use of v. Remains of protein recovery from protozoan biomass as a binder for paper coating slips. This is achieved according to the invention by the binder being prepared by simple extraction of whole or destroyed cells with acid and / or alkali in the heat or by enzymatic treatment. is included.

Description

OOCQQI C -ή- Heidenau, January 15, 1982

" ^{DO31 J} 133P-212-HÖ / B1

Paper coating slip Field of application of the invention

The invention relates to a paper coating slip consisting of a pigment and a binder which contains as binder a mixture of nucleic acid or its degradation products, protein, and carbohydrates of micro-ble origin, in particular of yeasts, and bacteria.

Characteristic of the known technical solutions

In. DE-AS 2303656 'describes the composition of a paper coating composition which contains as binder for the pigment an alkali decomposition product of a yeast. Among yeasts in the. Purpose of the invention are raw, dried and processed yeasts to understand which z. B, by the distance of. Nucleic acids have been obtained. The coating composition is used to produce paper with excellent printability. ,

The Terfahren has the. Disadvantage that valuable microbial protein of the diet of human and animal deprived, is.

The paper coating according to DD-WP 127510 calls as a binder, a mixture of, nucleic acids, and / or derivatives thereof, for. B.- Salts ... in the form of Nucleiriaten and fticle'Ötiden. alone or with proteins and / or carbohydrates, possibly in combination with other, commonly used

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"Binders, like ζ. Β. thermoplastic. Plastics * The preferred binder mixture consists, "based on the total dry matter weight of up to 90.% Ifuoleinsäure and / or Natriumnucleinat and / or nucleotide, up to. 30 wt.%. Of protein and up to 15 wt.% From carbohydrates together.

It is possible to obtain such mixtures of microbial biomass and at the same time the o. A. Part of the utilization of. Protein for purely industrial purposes. avoid.

To get to the preferred embodiment of DD-WP 127510 zra, it is sufficient in. general, not, for example, Hefebiomassen a simple extraction to undergo. The recovery of mixtures with up to 15 % carbohydrates. requires further workup of such an extract or Yor treatment of the yeast.

Object of the invention

The aim of the invention is to find a cheap binder for coating compositions for the production of high-quality printing papers.

Explanation of the essence of the invention

It has surprisingly been found that the nuclides obtained in the isolation of microbial protein for food purposes as by-products are monoacid-containing. Extracts from yeasts or bacteria can be used as binders for paper coating slips, even if, in contrast to DD-WP 127510, they are obtained by single-stage extraction and thus without further work-up. Such extracts are in particular by a carbohydrate content of. to. characterized to 45 % of dry matter.

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Furthermore, they can be up to. 50 % of the dry matter nucleic acids or their degradation products and up to. 30 % of the dry matter contains protein.

This compared to the DD-WP 127510 extended limit makes the. Production of the binder according to the invention by purpose and. Conditions of the processing of microbial biomass largely independent. Due to the low technological complexity, it is even not necessarily tied to the simultaneous extraction of certain cell constituents. It can be carried out by extraction of whole or destroyed cells with acid and / or alkali in the heat or by enzymatic treatment, optionally with the use of. Salts and detergents. The nucleic acid-containing extract thus obtained can be concentrated or used in dried form.

The binder of the invention is part of pigment-containing paper coating slip, wherein the pigments can represent the combinations kaolin / blanc fixe, kaolin / blanc fixe / satin white or even kaolin / blanc fixe / synthetic silicates. It can be alone, but also in combination. 2. B. with known thermoplastic materials, such as polyacrylic acid copolymers, butadiene-styrene copolymers. or polyvinyl acetates, preferably in a weight ratio based on dry solids, of from 1:10 to 4: 1. A combination with water-soluble. Binders, such as. B, starch, polyvinyl alcohol or the like is also possible. This new, coating is suitable for -the. Production of high-quality coated, printing papers, such as chromo or art paper, the binder according to the invention of microbial origin. (Nucleic acids or their degradation products / protein / carbohydrates) previously used natural binders such. As casein or carboxymethylcellulose, completely replace in these coating formulations.

The results achieved are in particular with regard to. Ink absorption, gloss and smoothness of the papers surprisingly positive.

Exemplary embodiments Example 1

Sine suspension composition is measured in the laboratory by means of a sacking bar on a base paper with a mass per unit area of 80 g / m. applied:

Blanc fixe. 540 parts by weight

Streichkaolin '460 parts by weight

Binder combination consisting of the binder mixture according to the invention 90 parts by weight with 12.0 weight-? 6 total

Nucleic acid 4.8% protein. 35.8% carbohydrate 19.5% ash by weight

(Viscosity of a 30% by weight solution with a pH of 7.7 at D * 146 s- ¹ and 25 ° C: 108 mPa-s)

Polyacrylic acid copolymer '90 parts by weight

Fe ststo ff content: 42.8 %

pH 8.0

"Viscosity (rotational viscometer" Rheotest ", 25 ° C):

Stage 10 a (D = 437 s " ¹ ) 27 mPa» s

Stage 12 b (D = 656 s ~ ¹ ) 22.mPa * s

Step 12 a (D = 1312 s-1) 15 mPa-s

Yiskosityindes || ^ | - ~ || ¹ > 47 water retention capacity. 7 s

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This coating composition comparatively has a lower viscosity and a lower water retention capacity than one with the same proportion. natural binder with caseinized suspension ..

The surface-sized paper has the following line properties after a Lauresatinage "at a line pressure of about 45 kli / cm:

Coating order 8 g / mr

Whiteness (Leucometer,

Blue filter) 80.4 %

Horn resistance number A

(IGS Leipzig) 1.0 m / s

Gloss (GM 70) 12 90

The paper shows about 30 % higher gloss and about 15 % lower Rupfwiderstandszahl compared to the painted with Kaseinanteil Tergleichsmuster.

Example 2

Analogous to Example 1, a base paper with 80 g / m is used. The coating composition has the following composition:

Blanc fixe 540 job site

Streichkaolin 460 parts by weight

Bindemitteikomaination, From the binder mixture according to the invention 90 parts by weight with 26.5 weight-> total

Nucleic Acid 4.4% by weight; protein; 14.9% by weight of carbohydrates 22.6% by weight of ash

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(Viscosity of a 29j9 weight percent solution with a pH of 7.0 "at J) = 146 s -1 and 25 ° C: 19 mPa * s)

Polyacrylic acid copolymer Ieststoffgehalt pH

"Rheotest" viscosity at 25 ° ^G, step 10 a (B = 437 s ^-1 ) step 12 Ix (D = 656 s ^-1 ) step 12 a (D * 1312 s ^-1 ) Tisi: osity3index 12 "b / i2a What are the reasons for this?

Compared to a strike mass with the same proportion. natural binder (casein), this suspension has a lower viscosity and a. lower water retention on.

The coated and satin-finished paper with the following properties shows about 15 % higher gloss compared to the comparison sample with a 20 % lower Rupf resistance and a 50 % higher water absorption.

90 G-ewichtsteile S 42 , 8 % S 6 , The ninth S 46 mPa 34 mPa 22 mPa 1 , 55 2 S

Coating application Co bb 7 7 g / m ² whiteness 81, % Water absorption after A (10s) 20 8th g / m ² Rupf resistance number O ₅ m / s shine 15 %

* - ο υ υ

Example 5

A suspension of the following composition is analogous:

the. Ex:

carried:

the. Example 1 on a Streichronpapier of. SO g / m

Blanc fixe 540 parts by weight

Streichkaolin 460 parts by weight

Binder combination "consisting of the binder mixture according to the invention 90 parts by weight with 34.3% by weight total

Jtfucleic acid 5.0% by weight Protein 9.9% by weight Carbohydrates 22.6% by weight Ash

(Viscosity of a 3%, 2% by weight solution with a pH of 7.1 at D = 146 s ^-1 and 25 ° C: 31 mPa s)

and

Polyacrylic acid ester interpolymer.

Fe ststo ff content, pH

ⁿ Hheotest "viscosity tei 25 Step 10 a (D» 437 s " ¹ ) Step 12 la (D = 656" s " ¹ } Step 12.a (D = 1312 s" ¹ ) Ink viscosity index 12b / 12a Water retention

In comparison to a coating composition with the same proportion of natural binder, this suspension has a slightly lower viscosity and a lower water retention capacity.

90 ⁰ C: 50 parts by weight 43 37 % 6 24 ,8th 1 3 mpa's mPa «s mPa * s , 54 S

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The surface-finished paper "has the following line properties according to a laboratory at age analogous to Example 1:

Coating application 8th 7 g / m ² whiteness 81, % What's up 19 0 g / m ² Brush resistance number A 1, m / s shine 14 %

Compared with the same proportion of natural. The binder has a check-finished comparison pattern and the paper has the same count resistance. approx. 10 % higher gloss and approx. 40 % higher water absorption.

Example 4

Analogously to Example 1, the following coating composition recipe

Coating paper from. 80 g / m applied ::

Blade fixed 540 parts by weight

Streichkaolin 460 parts by weight

Bindemittellconibiiiation consisting of the inventive. Binder mixture 90 parts by weight with 33.1% by weight total, Sfuclein-

acid

10.9% protein 25.0% carbohydrate. 17.2% ash by weight

(Tisko-sity of a 3%, 4% by weight solution with a pH of 7.0 at D = 146 s ^-1 and 25 ° G: 46 mPa · s)

2 3 6 8 9 1 5

Polyacrylate Miseh-

polymer 90% by weight

Pesticide content 43.0 % pH 7.4

"Bheotest" Yiskositat at 25 ° G:

Stage 10 a (D = 437 s-1) 32 mPa «s

Stage 12 b (D = 656: s ~ ¹ ) 25 mPa «s

Stage 12 a (D = 1312 s ~ ¹ ) 16 mPa * s

Yeast viscosity index 12b / 12a 1.56

Wasserrüekhaltevermögen. 4 s

In comparison to. a coating with the same. Proportion of natural binder (casein) this one lower; Yiscosity, and one. lower water ripples.

Las so that surface refinished and then calendered according to Example 1 paper has the following stroke properties:

Coating application 8th 5 g / m- We eat gr ad 81, 8th % Rupf resistance number A ο, m / s shine 12; %

In the same time. to. The proportionally with casein oberflach.en.Teredelten paper it assigns a. about 30 % lower Siipfwiderstandszahl and about 30 % higher gloss.

Example 5

In the semi-technical. Scale was measured on a one-side pre-painted art paper with a mass area of. about 90 g / m of the following coating compositions by means

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Air brush coater (with subsequent transfer rollers) at a machine speed of 80 m / min;

Blanc fixe 400 parts by weight

Streicnkaolini 340 parts by weight

Satin white 260 parts by weight

Bindemi tt elco combination, consisting of the invention. Binder mixture 34 (A) or

50 (B) parts by weight with 33.1 weight% total

Nucleic acid 10.9 weight-. Protein 25.0% carbohydrate 17.2% ash

(Viscosity of a 39.5% by weight, solution having a pH of τοη, 9.2: at, D = 146 s ^-1, and 25 ° G: 209 mPa · s)

Butadiene-styrene copolymer 197 parts by weight

Polyrinyl alcohol 12 parts by weight

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IIT!

Properties, the strike limit

Comparison formula with parts by weight. casein

Use of the e rf in dun gs according to the binder mixtures s

Parts by weight 34 (A) 50 (B)

Festatoff content, % 38.0 35.0 37.2 PH value 10.5 10.2 9.4 Water retention-capable, s 9.2 2.6 2.9 "Bheotest" viscosity, mPa * s (25 ° C): Level 10 (D = 437 s " ¹ ) 25 25 23 Level 12 to. (D «656 s" ^1:) 23 24 20 Stage 12 a (D = 1312 s- ¹ ) 20 20 .16 Yiskositätsindex 12to / 12a 1.15 1.20 1.25

The coated (coating order approx. 19 g / m.) And then satined laboratory. Papers have the following properties: '"."

stroke characteristics

Yergleichspapier with

That's a part

Test paper with varied proportion of binder mixture A B according to the invention

Whiteness (leukometer, 85.6 84.4 84.6 Blue filter), % Oil intake (10 s) 4 4 5 to Cobb-Ünger, g / m Smoothness after Bekk 245.5 325 258 (ca, 10 N), s 17 26 19 Shine after Gardner, %

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Yergleichspapier with; Sas an ant express

12

Yersuchspapier with varied proportion of binder mixture according to the invention A B

Brush resistance number A 4, 3 4 , 0 4, 6 (IGT Leipzig) % 16 19 31 K + M-ink ^receptivity;

The Yersuchspapier with a share in. The binder mixture according to the invention has a higher smoothness, a higher gloss and a higher ink receptivity at approximately the same resistivity.

That with the. Share A Inventive binder content coated and then practice-coated paper was the. Comparative paper (proportionately coated with casein) with regard to print suitability:

Pressure characteristics;

Yergleiehspapier with casein portion

Yseruchspapier with share A on. according to the invention binder

Laboratory printing: 32 2 29 7 Gloss (GM 70), % Scratch resistance, m / s 4 4 (Test printing device after Dürner) 0 52 2i 71 Wipe test, optical density

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Printing property. Yergleichs- Pilot paper with paper with Share A inventions casein according to the binding medium mixture Practice pressure (grading): "Pa / Khan na.h πι" - Blackprint 3 3 - bot 2 ... 3 3 ... 4 uniformity - Scliwarzdruck 1 ... 2 2 - Eot pressure 2 1 ... 2 Building the color 2 1

Both papers were classified by the printing company as qualitatively equivalent and suitable for printing.

Claims (3)

Erfindungsansprüehe 1. Papierstreiciimasse, "consisting of a pigment and a binder, as a binder, a mixture of nucleic acids" or their. A "b" building products, protein and carbohydrates of microbial origin, in particular of. Yeasts and bacteria, characterized in that the binder is obtained by simple extraction of whole or destroyed cells with acid and / or alkali in the heat or by enzymatic treatment, if appropriate using salts and detergents. 2. paper coating slip according to item 1, characterized in that the binder "up to 50 % of the dry matter from fuel acids" or their degradation products, up to 45 % of the dry matter from sole hydrates and up to 30 % of the dry matter of protein. 3. Paper coating by dots. 1 and 2, characterized in that the binder for the binding of. Combinations of up to 3 pigments is used alone or in admixture with conventional binders.