DE2303656C3 - Paper coating slip - Google Patents

Description

9. Paper coating slip according to one of the claims. Examples of yeasts, which according to the invention before 1 to 8, characterized in that they can be used as baker's yeasts (saccha binders a decomposition product of a yeast romyces cerviciae), nucleic acid yeasts (such as Candida contains, the yeast utilis before the alkali decomposition), brewer's yeast (Saccharomyces cerviciae), pulp yeast discolored with a peroxide or a reducing agent 55 or whole-food yeast (such as Candida utilis or Mycoto has been. rula japonica) and yeasts, which are petrochemical

10. Coated paper with high surface products (such as methanol, acetic acid or n-paraffin) strength, water resistance and compressibility - assimilate, z. B. Candida utilis, Candida novellus ability characterized by the usual (FRI deposit No. 705, see Japanese Patent Application and dried coating mass according to 60 registration no. 18 562/70), or Mycotorula japonica one of claims 1 to 9. or Pichia miso mogii. These yeasts can be raw

Yeasts as they are separated from the culture liquids

are separated or dried yeast, which by

Drying the raw yeasts can be obtained. Processed yeasts are also suitable for the invention, which

The invention relates to a paper coating slip obtained by various treatments of these yeasts Alkali decomposition product of a yeast as a binding agent, for example pulverization, removal of nucleus agents and which are used for the production of coated acids, degreasing, desalination, removal or automotive

jyse, have been received. Coated papers that using the paper coating slip according to the invention and which contain alkali decomposition products of yeasts made using of petrochemical products cultivated as a carbon source have better Quality than those made using other yeasts.

The yeasts used according to the invention are used in the form of the alkali decomposition products for producing the paper coating slips. Before the alkali decomposition, the yeasts can be decolorized with a peroxide, for example hydroperoxide or a reducing agent such as sodium borohydride. Examples of suitable alkalis for the decomposition of the yeasts are sodium hydroxide, ammonia, slaked lime, sodium sulfate, sodium carbonate or borax. Of these, sodium hydroxide, ammonia or a mixture of these substances are preferred. The amount of alkali used varies depending on the species. Gewöhn-Hch, however, the amount used is such that the pH of an aqueous suspension of the yeast is adjusted to at least 8, preferably 9 to 13. A suspension of the yeast, to which the alkali is added, is usually 10 minutes to 10 hours to 30 to 120 ⁰ C, preferably 10 minutes to 1 hour, ^{heated to 60 to 100 0} C, although in individual cases the temperature and the period of time varies according to the kind and amount of the alkali added. The resulting alkali decomposition product of the yeast can be used as such or after it has optionally been subjected to an after-treatment, for example by dialysis, desalination or addition of acid.

The pigments which can be used in the invention are not particularly limited. Anyone can do it Pigments which are generally used for paper coating can be effectively used. Examples of suitable pigments are clay, titanium oxide, satin white and calcium carbonate.

In general, 5 to 50 parts by weight of the pigment binder are used in the paper coating slip 100 parts by weight of pigment used. A mixture of the aforementioned can also be used as a pigment binder Alkali decomposition product of the yeast and at least one emulsion of a synthetic polymer or an aqueous solution of a natural or synthetic polymer can be used. Aqueous emulsions (Latexes) of styrene / butadiene copolymers, butadiene / methyl methacrylate copolymers, styrene / Butadiene / methyl methacrylate copolymers, ethylene / vinyl acetate copolymers, polyvinyl acetate, vinyl acetate / Acrylate copolymers, styrene / acrylate copolymers, styrene / vinyl acetate copolymers, or of these Polymers which have been modified with functional group containing monomers are useful used as an emulsion of the synthetic polymer. Examples of water soluble natural or synthetic polymers are casein, soybean protein, modified starch, polyvinyl alcohol and Carboxymethyl cellulose. If desired, the paper coating agents of the present invention can be used furthermore auxiliaries which are usually used for pigment-coated papers contain, for example Foam control agents, lubricants, surfactants, insolubilizers, dispersants for the pigment and viscosity control agent.

The invention is illustrated in the examples. It contains all information relating to parts and percentages based on weight.

example 1

100 parts of Georgia kaolin was gradually added with stirring to 46 parts of an aqueous solution containing 0.3 part of sodium hexametaphosphate (SHMP) as a dispersant. In this way a slurry of the pigment was formed. A 10% suspension (pH 11.5) of yeast (Candida novelius), composed of 100 parts of water, 10 parts of yeast and 0.5 part of sodium hydroxide, was ^{heated to 50 °} C. for one hour with stirring, whereby a liquid was formed, which contained an alkali decomposition product of yeast.

To the pigment slurry were the decomposed yeast and 10 parts (as solid matter) of a latex added a copolymer of the styrene / butadiene type, whereby a paper coating slip was obtained, which had a total solids concentration of 40%.

For comparison purposes, a paper coating slip was produced according to the conventional method, using commercial casein or oxidized starch in place of the yeast decomposition product would. The formulations of the properties of these paper coating slips are given in Table 1-1.

Table 1-1

Mass 1 comparative comparative according to the mass mass
Invention) / ^ β

100

100

Georgia kaolin, 100

Parts

Sodium hexameta-0.3 0.3 0.3

phosphate, parts

Styrene / butadiene 10 10 10

Latex, parts

Sodium hydroxide, 0.5 0.4 -

Yeast, parts 10 - -

Casein, parts - 10 -

Oxidized starch, - - 10

pH 9.4 8.9 7.3

Viscosity i) 75.0 78.5 42.5

>) Measured at 2O ⁰ C in 60Upm on a viscometer of the BL-type rotor no. 2 (unit cps).

The individual paper coating slips were coated on high quality paper in such an amount that the coating weight was 10 g / m ² . After coating, the coated papers overnight in a luftkonditionierten chamber were stored, which was maintained at 20 ⁰ C and a relative humidity of 65%. Then, they were subjected to a super calendering at 7O ⁰ C and 135kg: cm subjected. The surface strength (IGT uptake resistance), water resistance and air permeability are shown in Table 1-2.

Table 1-2

Mass 1
(according to the
Invention)

Comparative mass A

Comparative mass B

IGT up- 185 154 148

accepted

location ² )

Water-ex- cessive

persistence ³ ) excels

Air permea- 727 2.258 645

bility ⁴ )

«) Measured at a printing ^{pressure of 35 kg / cm 1} with a spring strength of M on an IGT printability diester using printing ink with a tack value of 16; Unit cm / sec.

³ ) After water has been applied to the coated surface, the paper is printed using an RI printability tester. The condition of the recording is rated as excellent, good, moderate or bad according to a scale.

♦) Measured on an air permeability and smoothness tester of the Bekk type; Unit seconds.

The table above shows that the paper which has been coated with the agent according to the invention has superior IGT uptake resistance and air permeability to a paper, which has been deleted with a casein-containing agent. It will also be seen that the inventive coated paper has superior IGT uptake resistance and water resistance than the paper that has been coated with an oxidized starch-containing agent.

Example 2

As in Example 1, a paper coating composition was prepared with the exception that 10 parts Cancida utilis was used as the yeast and that the decomposition was carried out with a part of sodium by 30 minutes heating at 80 ⁰ C (pH 12.8). The coated paper was subjected to the same test as in Example 1. The results obtained are shown in Table 2.

Table 2

12.8) had been decomposed. For comparison purposes, spreads were prepared in a similar manner using casein and oxidized starch. Table 3-2 shows the properties of the coated papers (with a coating weight of 20 g / m ² as solids content).

Table 3-1

Mass 3 comparative comparative

(according to the mass C mass D

Invention)

Georgia kaolin, 100 100 100

Parts
* 5 sodium hexameta- 0.3 0.3 0.3

phosphate, parts

Styrene / butadiene 10 10 10

Latex, parts

Yeast, parts 5 - -

Casein, parts 5 10 -

Oxidized starch, - - 10

Parts

Sodium hydroxide, 0.25 - -

Parts
Ammonia (such as 3.15 1.0 -

NH ₄ OH), parts

pH 10.9 9.9 7.5

Table 3-2

Mass 3
(according to the
Invention)

Comparative mass C

Comparative dimension D

IGT recording 220 210 90 35 durability Water resistance out out mlßi age draws draws Air permeability 5250 5400 3850

Mass 2 Comparison Comparison (according to the mass A mass B Invention) (Casein) (oxidized Strength) IGT recording 197 154 148 resistance Water resistance out out moderate age draws draws Air permea 867 1.158 645 mobility

From Table 2 it can be seen that the coating slip of this example has properties similar to that of of Example 1 has.

Example 3

A paper coating slip was prepared according to the formulation in Table 3-1 using a decomposition product of a Saccharomyces yeast which had been obtained by treating the yeast with sodium hydroxide (5% of the yeast) and ammonia (53% of the yeast as NH ₄ OH) 10 hours at 30 ^° C. (pH

Example 4

90 parts of Georgia kaolin were gradually added with 40 parts of water, in which 0.27 part of sodium hexametaphosphate had been dissolved as a dispersant. In this way a slurry of the clay was obtained.

Separated were 10 parts of water, in which 0.3 parts (as a solid content) of polysodium acrylate dissolved as a dispersant was added to 10 parts (as solid content) of satin white.

The mixture was stirred thoroughly to form a slurry of satin white.

Sodium silicate was added to a suspension of 70 parts of water and 10 parts of Candida novellus to adjust the pH to 5. 0.5 parts by volume of 30% strength aqueous hydroperoxide were added to this suspension. The mixture was shaken at 30 ° C for 1 hour. Then 2.5 parts by volume of 10% sodium hydroxide and then 20 parts by volume of 28% aqueous ammonia were added. The mixture was ^{heated to 75 °} C. for 1 hour, whereby a solution was obtained which contained the decomposed yeast.

The satin white slurry became the clay slurry given. With stirring, the decomposed yeast, 10 parts (as solid content) of a copolymer latex of the styrene / butadiene type and water, creating a paper coating slip with a total solids concentration of 40 behaviors

6o

For comparison purposes, a paper coating corn was used manufactured according to the conventional process, including commercial casein instead of the decomposition product the yeast was used. The formulation and properties of these paper coating slips are given in Table 4-1.

The individual paper coating slips were coated onto cardboard in such an amount that a coating weight of 20 g / m ^{2 was} obtained. It was then air dried. The surface of the coated paperboard was treated with a 30% aqueous solution of zinc sulfate and then allowed to dry by was allowed to stand overnight in a luftkonditionierten chamber at 20 ⁰ C and a relative humidity of 65%.

The surface strength (IGT absorption resistance) and the water resistance of the coated papers obtained are shown in Table 4-2. From Table 4-2 it can be seen that the coated with the coating slip according to the invention Paperboard has superior IGT uptake resistance to paper coated with a casein-containing composition and has equivalent water resistance.

Table 4-1

Mass 4 (according to
the invention)

Comparative mass E

Georgia kaolin, parts 90

Sodium hexameta- 0.27

phosphate, parts

Satin white, parts 10

Poly (sodium acrylate), 0.3

Styrene-butadiene latex, 10

Yeast, parts 10

Casein, parts -

Sodium hydroxide, parts 0.25

28% aqueous 20

Ammonia, parts

30% hydrogen 0.5

peroxide, parts

pH 11.3

Viscosity 133

Table 4-2

90

0.27

10
0.3

10

10
0.4

10.4
83.0

Mass 4 (according to
the invention)

Comparative mass E

IGT uptake resistance
Water resistance

181 cm / sec

excellent

154 cm / sec

excellent

Example 5

90 parts of Georgia kaolin were gradually added with stirring to 60 parts of water, in which as Dispersant 0.27 part of sodium hexametaphosphate had been dissolved. In this way a slurry of the clay was formed.

Separately, to 10 parts (as solid content) of satin white was added 20 parts of water in which 0.3 part (as solid content) of polysodium acrylate as a dispersant had been dissolved. on in this way a slurry of satin white was formed.

1.4 parts of sodium peroxide were added to a suspension of 10 parts of yeast (Candida utilis) and 40 parts of water. The mixture was ^{shaken at 30 °} C. for 1 hour. Then, 20 parts by volume of 28% aqueous ammonia was added and the mixture was treated for 24 hours at 3O ⁰ C. In this way a solution of the yeast decomposition product was formed.
The satin white slurry was added to the clay slurry. While stirring, the decomposed yeast, 12 parts (as solid content) of a latex of a methyl methacrylate / butadiene type copolymer and water were added to give a dope having a total solid concentration of 40%. For comparison purposes, a dope was prepared in a conventional manner using modified vinyl alcohol (PVA) in place of the decomposed yeast. The formulations and the properties of these paper coating slips are summarized in Table 5-1.

The individual coating slips were applied to cardboard in such an amount that the coating weight was 20 g / m ² . It was then dried. The surface of the coated paper was treated in a 3% aqueous zinc sulfate solution and dried by allowing it to stand overnight in an air-conditioned chamber maintained at 20 ° C and a relative humidity of 65%.

The surface strength (IGT absorption resistance) and the water resistance of the coated papers are shown in Table 5-2. It will it can be seen that the cardboard which had been coated with the composition according to the invention was superior IGT uptake resistance and water resistance to a paper made with an agent containing the modified polyvinyl alcohol had been deleted.

Table 5-1

60 Table 5-2 Mass 5 (according to Comparison the invention) mass F ♦ 5 Georgia, kaolin parts 90 90 Sodium hexameta 0.27 0.27 phosphate, parts Satin white, parts 10 10 Poly (sodium acrylate), 0.3 0.3 5 ° parts Styrene / butadiene latex, 12th 12th Parts PVA. Parts - 4th Yeast, parts 4th - 55 sodium peroxide, parts 1.4 - 28% aqueous 20th - Ammonia, parts pH 10.8 7.3 viscosity 38 172 Mass 5 (according to Comparative the invention) massc F

IGT uptake resistance
Water resistance

137 cm / sec 77cm / s excellent
draw Well / no ίΛ O / T37

Claims (8)

JL nen paper with excellent printability is suitable. . . When printing on paper, for example on 1. Paper coating slip, characterized by marked paper or of certain types of character, that it is used as a binder for the 5 cardboard or paperboard (in the following the expression pigment is an alkali decomposition product of a yeast, paper, paperboard or cardboard; compare if necessary in a mixture with an emulsion H.Rörapp, Chemie-Lexikon, O. Edition, Volume IH _{1 of} a synthetic polymer and / or a p. 4651 to 4659, Francksche Verlagshandlung, Stuttgart aqueous solution of a natural or synthetic; a pigment is applied to the surface of the paper Table polymer contains 10. Coated as a binder for the pigment 2. Paper coating slip according to claim 1, characterized by an aqueous solution of a natural pol> that the amount of binder meren substance, for example casein, soy-5 up to 50 parts by weight per 100 parts by weight of the bean protein, modified starch or carboxy pigment amounts to. methyl cellulose or a synthetic polymer 3. Paper coating slip according to claim 1 or 2, 15 material such as polyvinyl alcohol and an emulsion characterized in that it is used as a binder of a synthetic polymer, for example a the alkali decomposition product of a baker's yeast, latex made from a styrene / butadiene copolymer, ent nucleic acid yeast, Brewer's yeast, pulp yeast and / or neither on its own or in admixture. Yeast, which assimilates petrochemical products, Of these products, casein has the advantages of being contains. 20 maintains a better dispersing effect than 4. Paper coating slip according to claim 1 or 2, starch or polyvinyl alcohol and that there is also one characterized in that it has better water resistance as a binder. For this the alkali decomposition product of a yeast, which is why it is found in large quantities in paper be-methanol, Acetic acid or η-paraffins assimilated, stratification industry used. However, since the Qua contains. 25 The quality of the casein strongly depends on the origin of the 5. Paper coating slip according to one of the claims and because its costs are due to the increased before 1 to 4, characterized in that they have risen sharply as a requirement in recent years The alkali decomposition product of a strong interest in a substitute for the binder Yeast of the species Saccaromyces, Candida, Myco-Casein emerged. torula and / or pichia. 30 On the other hand, water- 6. Paper coating slip according to one of claims soluble natural or synthetic polymeric mateche 1 to 5, characterized in that it contains, as rialien, such as modified starch, carboxymethylcellu binder, a decomposition product of a yeast loose or polyvinyl alcohol, in increasing amounts, which with the alkali 10 minutes to 10 hours. These products are, however, due to has not Imbis 1 hour at 60 to 100 ° C, heated at 30 to 120 ⁰ C, preferably 10 minutes 35 to their inferior water resistance thereto. stand to completely replace the casein. 7. Paper coating slip according to one of the claims It has now been found that the use of a ehe 1 to 6, characterized in that they are used as the alkali decomposition product of a yeast as a binder Binder contains a decomposition product of a yeast for the pigment to overcome the above, using sodium hydroxide, ammonia, 40 th disadvantages and the production of a Slaked lime, sodium phosphate, sodium carbonate coated paper allows which a high and / or borax, preferably sodium hydroxide, surface strength and water resistance and Ammonia or a mixture of these substances has superior printability. has been received. The invention is a paper coating 8. Paper coating slip according to one of claims 45, which is characterized in that it is used as ehe 1 to 7, characterized in that the binder for the pigment is an alkali decomposition-alkali decomposition product contains a yeast, the product of a yeast, optionally in a mixture with the amount of alkali has been dimensioned so that that of an emulsion of a synthetic polymer and / pH of the aqueous suspension of the yeast min or an aqueous solution of a natural or at least 8, preferably 9 to 13, reached. Contains 50 synthetic polymers.