TDS Mowital® B (EN)

Mowital® B
Technical Data Sheet
Characteristics
Polyvinyl butyral (PVB) grades with different molecular weights and degrees of acetalisation.
Recommended uses
Temporary binder for ceramics. Binder for coatings, adhesion promotion, corrosion protection primers, shopprimers, wash primers, stoving enamels, varnishes and lacquers for different substrates. Binder for printinginks.
Co-binder for powder coatings. Binder or raw material for textile printing and non-woven. Wetting agent forgrindings, esp. of organic pigments. Adhesives, pressure-sensitive adhesives and hotmelts.
Form supplied
Fine-grained and free-flowing white powder.
Specification data
The data are determined by our quality control for each lot prior to release.

Non-volatile
content1

Content ofpolyvinyl alcohol2

Content ofpolyvinyl acetate3

Dynamic viscosity4,5

wt-%

wt-%wt-%mPa · sMowital® B 14 S

≥ 97,514–18

5–8

9–14

Mowital® B 16 H

≥ 97,5

18–21

1–4

14–20

Mowital® B 20 H

≥ 97,5

18–21

1–4

20–30

Mowital® B 30 T

≥ 97,5

24–27

1–4

30–55

Mowital® B 30 H

≥ 97,5

18–21

1–435–60

Mowital® B 30 HH≥ 97,511–14

1–4

35–60

Mowital® B 45 H

≥ 97,5

18–21

1–4

60–90

Mowital® B 60 T

≥ 97,524–27

1–4

180–280

Mowital® B 60 H

≥ 97,5

18–21

1–4

160–260

Mowital® B 60 HH≥ 97,5

12–16

1–4

120–280

Mowital® B 75 H

≥ 97,5

18–21

0–4

60–1006

Grade1) Kuraray method ref. DIN EN ISO 3251:2019-092) Kuraray method ref. DIN EN ISO 4629-1:2016-123) Kuraray method ref. DIN EN ISO 3681:2019-034) Kuraray method ref. DIN 53015:2019-06, at 20 °C5) as 10 % solution in ethanol containing 5 % H2O6) as 5 % solution in ethanol containing 5 % H2O

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TDS Mowital® B (EN)

Additional data
These data are used solely to describe the product. They are not subject to constant monitoring or part of the specification.

Glass transition temperature
The glass transition temperature is determined according to the following standard:
DIN EN ISO 11357-1:2017-02. The Mowital® B grades have average values in a range of 60–73 °C.
Moisture absorption
Moisture absorption is determined according to the Kuraray method following standard:
DIN EN ISO 3251:2019-09. When applying the standard climate (23 °C / 50 % r. h.), the Mowital® B grades
show average values in a range of 0,5–1,5 %.
Bulk density
The bulk density is determined according to the Kuraray method, which refers to DIN EN 543:2003-08.
The Mowital® B grades have average values in a range of 200–350 g/l.

Nomenclature
The tradename Mowital® is followed by a capital B stating the butyraldehyde used. The numbers refer to thedegree of polymerisation, the higher the number the higher the degree of polymerisation (viscosity). The
suffixes T, H, S and HH indicate the degree of acetalisation (T being the lowest and HH being the highest).

PROPERTIES AND USESThe Mowital® grades are thermoplastic polyvinyl butyral resins. The properties of the grades are mainly
determined by molecular weight and degree of acetalisation. Mowital® can be processed thermoplasticallyor in solution of organic solvents.
Mowital® grades are soluble in a broad variety of organic solvents. They show good compatibility withplasticisers and other resins. The grades are able to cross-link with other resins such as phenolic, epoxy
and melamine resins.
The network density may be adjusted depending on the degree of residual OH-groups which is determined by
the degree of acetalisation (see stoving enamels).
Mowital® films are resistant to light and heat-sealable at temperatures above 120 °C. Toughness and elasticity
are influenced by their molecular weight. Water resistance and solubility in non-polar solvents mainly dependon the degree of acetalisation. Mowital® HH grades show the highest water resistance and best solubility in
non-polar solvents such as toluene. Guided recipes can be provided on demand for different applications.
Temporary binder for ceramics
Mowital® is an excellent binder for the production of ceramics and ceramic tape cast materials. It shows
remarkably good strength and flexibility of the ceramic tapes. Mowital® provides good dimensional stability
and decomposes cleanly during sintering.
Stoving enamels
Due to their medium to high content of hydroxyl groups Mowital® grades are particularly suitable for crosslinking with phenol formaldehyde, epoxy and melamine resins, respectively.
In stoving enamels the Mowital® content should be between 10 and 40 % based on total binder content.
Generally, stoving conditions are temperatures between 160 and 200 °C for 10 to 20 minutes. In the case ofmulti-layer coatings the first layer should not be fully stoved before application of the second layer in order
to avoid adhesion faults of the succeeding coating.
Mowital® H grades provide better plasticising properties in above mentioned binder combinations. However,they are less cross-linkable then T grades due to the lower number of non-acetalised OH-groups.

2TDS Mowital® B (EN)

Shop and wash primers
In combination with orthophosphoric acid Mowital® H and HH grades are generally used to manufacture shop
and wash primers (1K and 2K primers). The films adhere extremely well to steel, iron, zinc, aluminum and othermetals.
To achieve further improvement in anti-corrosion protection as well as adhesion Mowital® can be combinedwith low-molecular weight phenolic, epoxy or melamine resins as well as corrosion protection pigments. The
good anchorage of the primer on metal is caused by a binder/pigment/orthophosphoric acid/metal complex.
In 1K primers the orthophosphoric acid is added to the primer during its manufacture. The acid amount usedshould not exceed 5%. In the case of 2K primers the acid is supplied in a second container separately. 2K
primers contain higher acid amounts. However, if the level exceeds 10 % the coating becomes less water
resistant. Upon mixing the pot life of the 2K primer is limited to a few hours.
Printing inks
Low-viscosity grades are suitable binders for flexographic and gravure printing inks. They exhibit very goodadhesion to substrates like polyolefins, metals, cellulose acetate, polyester, cellophane, polyamide, andpolystyrene films. If necessary, the adhesion to problematic substrates like OPP foil can be improved by way
of coronal discharge and chemical adhesion promoters. Mowital® show an excellent pigment wetting property.
These grades are suitable for the manufacture of pigment concentrates and preparations.
Printing inks based on Mowital® exhibit low solvent retention, and good flow, as well as good resistance towater. Mowital® can be used as a sole binder or in combination with alcohol-soluble nitro-cellulose or otherresins, like ketone condensation resins, alkyds, maleic resins, and some natural polymers.
Strippable lacquers
Although Mowital® H grades exhibit very good adhesion properties they may also be used successfully as
strippable lacquers. Strippability has to be adjusted using common additives and will retain for severalmonths.
Foil lacquers
Mowital® H grades are specially suitable binders for lacquers on aluminum, tin, brass, lead and steel foils. Witha dry film thickness of 2 to 10 µm the films have a very good flexibility. Their adhesive strength can be improved by stoving at temperatures of up to 140 °C. If necessary, gloss and flexibility can be improved by additionof plasticisers.
Adhesives and hotmelts
Owing to the excellent adhesion of Mowital® to glass and metals, it is used to bond or laminate these materials.
It may also be employed for binding other polar substrates. Mowital® can be applied in solution or as a part ofhotmelt.
For hotmelts Mowital® is compounded in heated kneaders or extruders with plasticisers and adequateadditives. These compounds are applied by heated rollers, nozzles or spray guns on to one of the substrates
and subsequently submitted applying heat and pressure.
Preparation of solutions
Mowital® can be dissolved in single solvents. To obtain low solution viscosities it is recommended to dissolve
Mowital® in solvent mixtures (e.g. 1:1 mixture of ethanol and toluene). Mowital® is not soluble in water. However,a water content of up to 10 % in the solvent mixture is possible and can be used to influence solution viscosity.
The viscosity depends on the solvent (e.g. increase in ethanolic solution) and must be tested in advance.
To dissolve Mowital®, while low to medium stirring speed of the solvent, Mowital® is added in portions atambient temperature. This ensures good dispersion of Mowital® powder in the solvent and avoid dusting. Laterthe the stirring speed can be increased. Sometimes heat may be necessary for dissolving Mowital®. In this casedo not apply heat until Mowital® is wetted to avoid agglomeration.
For preparation of a solution with mixed solvents first add Mowital® to the solvent which does not dissolve
Mowital® alone (e.g. aromatic solvent) in order to form a slurry. Then add the alcoholic solvent which normallydissolves Mowital® best.
The final solution viscosity as well as the speed of dissolution depend on the used solvent, the temperatureand the stirring speed.
Overpaintability
Virtually all commonly used paints adhere to hardened coatings of Mowital® based primers. Problems may be
encountered using some special nitro-cellulose or 2-component epoxy resin paints.

3TDS Mowital® B (EN)

Storage
Mowital® B grades can be stored in its original packaging under dry and cool conditions for at least 12 months
after delivery date.
Precautions
Static electricity has to be avoided applying the appropriate safety measures while handling Mowital® as wellas organic solvents.
Food contact status
The use of Mowital® is sanctioned by: The (EU) regulation 1935/2004 and No. 10/2011 – all monomers andstarting sub-stances authorised by listing in Annex I.
As well as Council of Europe, Resolution AP 96(5) on surface coatings intended to come into contact withfoodstuffs – all monomers and starting substances authorised by listing in appendix 2, list 1. US Food andDrug Administration 21CFR § 175.105 Adhesives, § 175.300 Resinous and polymeric coatings, § 176.170
Components of paper and paperboard in contact with aqueous and fatty foods, § 176.180 Components ofpaper and paperboard in contact with dry food.
Industrial safety and environmental protection
Not classified as a dangerous substance or preparation according to the current criteria of chemicallegislation, or of the CLP regulation EU Directives (1272/2008).
A safety data sheet is available on our homepage www.mowital.com and is updated on a regular base.
Waste disposal
In accordance with current regulations and/or after consultation with site operator and/or with theresponsible authorities Mowital® may be taken to waste disposal sites or incineration plants.

This information is based on our present state of knowledge and is intended to provide general notes on our products and their uses. It should therefore not beconstrued as guaranteeing specific properties of the products described or their suitability for a particular application. Any existing industrial property rights must beobserved. The quality of our products is subject to our General Conditions of Sale. July 2024

Kuraray Europe GmbH
Philipp-Reis-Str. 465795 Hattersheim
Germany
Comm. contact: antonio.velardo@kuraray.com
Techn. contact: anna.hoffmann@kuraray.com
� www.mowital.com

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