MOWITAL G – Multi-talented Thermoplastics

Mowital® G
M U LT I - TA L E N T E D T H E R M O P L A S T I C S
Mowital® G
M U LT I - TA L E N T E D T H E R M O P L A S T I C S
POLYMERS OF THE MOWITAL® G SERIES ARE AMORPHOUS THERMOPLASTIC
POLYMERS WHICH ARE PROVIDED AS GRANULES WITH LOW RESIDUAL
WATER CONTENT (<0.5 WEIGHT-%).
Mowital G grades have excellent melting behavior and can be used in
injection moulding, melt blowing, thermoforming and standard extrusion procedures. Due to the granular shape Mowital G can easily be
used in all kinds of feeding systems.
Moreover Mowital G granules allow dust-free application, are non-toxic
and comply with most of the common regulations for food packaging.
Due to their advanced structure consisting of polyvinyl butyral, polyvinyl acetate, and polyvinyl alcohol units, Mowital G grades exhibit
excellent adhesion to glass, metals, wood, ceramics, etc.
They are soluble in many organic solvents and exhibit excellent
film-forming properties and may be combined with a wide range of
other polymers.
Mowital G grades are ideal both as a binding agents as well as dispersants. It predestine them for successful use as dispersing agent for
masterbatches or the colouring of polymers. The chemical structure
provides a semipolar character of Mowital G enabling the usage as a
compatibiliser for colour pigments, inorganic fillers, like metal oxide
or metal particles as well as carbon black. Mowital G is colourless,
transparent, and lightfast. These properties make them the preferred
polymer for colour-neutral formulations with high colour-purity.
Mowital G grades can be burned out without residue. Hence they are
suitable as a temporary binder for e.g. powder-injection moulding
processes.
Since Mowital G is compatible with various plastics, such as PMMA, PA,
PVC, ABS, or TPU, it is especially valuable for applications in masterbatch formulations. Beside this, Mowital G grades can be used as additives for thermoplastic compounds and thermoplastic elastomers as
adhesion promoter, e.g. for bonding of polymeric compounds to glass,
metals and ceramic substrates.
Free OH-groups of the polymer derived from the polyvinyl alcohol units
enable cross-linking reactions with e.g. epoxies, phenolics, isocyanates
leading to modified, elasticised thermoset materials or modified binders based on a polyvinyl butyral scaffold.
PHYSICAL PROPERTIES
Characteristic physical properties like solvent viscosities, melt flow
indices (MFI), glass transition temperatures (Tg), and softening temperatures of the Mowital G types are mainly determined by increasing
degree of polymerization and molecular weight:
Glass transition temperatures (Tg) between 63 °C and 84 °C are measured for the individual types.
The softening temperature ranges start with the low-viscous types at
about 125 °C and ends with the higher viscous grades at approximately
235 °C giving melt flow indices (190 °C, 2.16 kg [g/10 min.]) from
85 for low-viscous grades down to approximately 1 of higher-viscous
grades. This correlates to solvent viscosities (10 weight-% in ethanol
[mPas]) ranging from 20 to 1000 mPas.
MECHANICAL PROPERTIES
Mowital G grades exhibit E-moduli ranging from 2300 to 2600 N/mm²,
yield stress values from 40 to 60 N/mm² depending on the degree of
polymerisation with elongation values ranging from 0.5 to 4 %.
Charpy Impact Test values range from 0.5 to 5 kJ/m² (notched) and
10 – 98 kJ (not notched). Under Vicat B test conditions Mowital G polymers exhibit Vicat softening temperatures from 62 – 66°C and Shore D
values of 83 – 85.
CHEMICAL COMPOSITIONS
Polymers of the Mowital G series consists of polyvinyl butyral, polyvinyl
acetate, and polyvinyl alcohol units. The polyvinyl butyral units and
the backbone determine the unpolar character whereas the polyninyl
acetate and polyvinylalcohol units determine the polar character of
the polymer. Besides this, the free OH-groups enable cross-linking reactions with other reactive chemicals or resins.
backbone
OH
unpolar
side-chain
polar
units
OAc
cross-linking
chemical reactivity
MOWITAL G GRADES RANGE
1) 10 w.-% viscosity in ethanol at 20°C
2) 190°C, 2,16 kg load
3) DSC, according to ISO 11357-1
4) Ring and ball method, DIN EN
ISO 4625 5) According to DIN EN ISO 527 6) According to DIN EN ISO 179 7) According to DIN EN ISO 306 8) According to DIN 53505
Mowital® G
M U LT I - TA L E N T E D T H E R M O P L A S T I C S
PROPERTIES
✓ polyvinyl butyral-based polymers
✓ granules
✓ amorphous thermoplastic polymer
✓ colourless and transparent
✓ excellent adhesion to glass, metals, wood,
and ceramics (thermoplastic adhesive)
✓ low residue moisture content (below 0.5 %)
✓ burns out without residue
✓ non-toxic and dust-free
POTENTIALAPPLICATIONS
APPLICATIONS /
POTENTIAL
OPTIONAL USE
✓ suitable for thermoplastic processing
(injection moulding and extrusion processes)
✓ compatible with various plastics, e.g. PMMA,
PA, PVC, ABS, TPU, or thermoplastic elastomers
✓ use as compatibiliser and dispersing additive for pigments, inorganic fillers, metal
particles
✓ adhesion promoter (glass, metals, wood,
ceramics, etc.)
✓ use for formulations with high-colour purity
✓ reactivity of free OH-groups (cross-linking,
base for chemically modified PVB-binders)
✓ allows usage for moisture-sensitive
applications
✓ temporary binder for powder–injection
moulding (PIM)
✓ compliance with food regulations
World leader
in polymer chemistry
Kuraray is the leading supplier of polyvinyl alcohol (Mowiol® and Kuraray POVAL®), its films and
fibres (KURALON), polyvinyl butyrals (Mowital® and Pioloform®) and its films (TROSIFOL®) for
the global market. Kuraray also manufactures a variety of special polymers like ethylene vinyl
alcohol copolymers (Exceval™ & EVAL™) and thermoplastic elastomers (SEPTON™ & HYBRAR™).
In addition, based on the polymer technologies, the company also supplies dental products,
fibres, textiles and synthetic leathers.
FOR FURTHER PRODUCTS OF THE KURARAY GROUP,
PLEASE GO TO WWW.KURARAY.EU
Kuraray Europe GmbH
Head Offices
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Kuraray Europe GmbH
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Phone
+ 49 69 305 - 85343
E-Mail
marketing-pvb@kuraray.eu
www.kuraray.eu
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Ote Center Building
1-1-3, Otemachi, Chiyoda-ku
Tokyo 100-8115
Japan
Phone
+ 81 3 6701 - 1000
Fax
+ 81 3 6701 - 1005
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Houston, TX. 77058, U.S.A.
Phone
+ 1 713 495 7380
Fax
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331 North Bridge Road
#18-02 Odeon Towers
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+ 65 337 - 4123
Fax
+ 65 337 - 1912
08/2013
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Xuhui District
Shanghai 200030, China
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+ 86 21 6119 - 8111
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+ 86 21 6119 - 8585