Coating 12/2015

Nachbericht MKVS
Review MKVS
Adhesives - the talk of the town
today and tomorrow
Forty years after Prof 01' Knut Nitzl initiated the first MKVS
(Munich Adhes ives and Fini shing Symposium) in 1976 and ten
yea rs since th e current organizers, Stephan Hinterwaldner and Or
Michael Ge rstenberger of MKVS GbR , took the helm - the 40 th
MKVS programm e marked both anni ve rsari es at once. From October 26-28, 20 15, once again 250 or so developers, technical speciali sts from the industry and academia co ming from almost 20
«save food», he showed how using the right packaging - that thi s
also includes the right adhesive goes without saying - can save or
better th e lives of millions. Th e 20 minutes allotted to each oral
presentation hardl y see med enough time to touch all aspects of
th e goals the technology, chemistry and research presented in the
following 25 papers are meant to reach.
countries converged to discuss what is new and newsworth y in
pressure sensitive adhesives with a focu s on di spersions, solvent
Chaired by Evert Srn it from Lohman, the remaining first day featured two different ways in which nature can influence adhesives
and specific approaches to applying th em and the pitfalls to evade
borne products, reactive systems and I·IMPSA in English and German - as well as to make use of th e industry reunion to float new
ideas, discuss th e food for thought presen ted 01' simpl y tou ch base.
As in th e previous yea r s, th e symposium was topp ed off with a
table top ex hibition, providing a more in depth in sight and the
opportunity to discuss some of the expertise ex pressed in th e
pape rs gi ven . Arizona Chemicals, Cabot, OK SJ, Emerell, ITW
Dynatec, Keyser & Mact<ay, Michelman, Nordman Hassman , TER
Group and V iscoTec participated in this ex hibition.
in doing so. Resources co mmon in nature and therefore eaSily
reprodu cible, such as yeast, sugar or bacteria, provi de th e basis for
the higher alcohols and ketones, Or Andreas Menne from Fraunhofer Institute for Environmental, Sa fety, and Energy Technology
UMSICHT ex plained. The intermediates usabl e as e.g. solvents
and derivatives usabl e as eg plasti Cisers are th e products a special
catalytic coupling process developed by UMSICHT can generate
from th ese renewab le resources. However, adhesive properti es
common in nature can also in sp ire innova ti ve properti es engineered in ad hesives. For example arachnid s inspire th e glue for
otherwise anti-adhesive surfaces introduced by 10nas O. Wolff
from th e Departm ent of Functional Morphology and Biomechanics at the University of Ki eL Thi s development is still at the outset.
Time to marl<et is estimated at around 15 years.
With hot melts bei ng the adhesive of choice where energy needs
to be saved and environmental aspects play a role, th e application
process, too, needs to be examined according to economic criteri a.
The pl enary speech on development, economic importance,
growth factors and markets with a speci fic focus on PSA by Ansgal' van Halteren from th e german adhesives association, Industri eve rband Kl ebstoffe e.V., Idcked-off th e symposium. Franky
Dauw from ExxonMobil Chemical, continued in thi s vein by showing how the HM(PS)A indu stry can meet future nee ds. These
papers paved the way for lurther more in depth discussions of th e
chemistry and technology involved in innovative and niche markets such as printed elec tronics and cash cows such as packaging.
«Dragging» adh esives from the ivo ry tower 01 pure research, technology and th eory, Bernd lablonowski from Messe Dusseldorf
brou ght a real-world tone to th e table: prese nting th e initiati ve
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For example, when hotmelt-PSA are appli ed by smooth rollers in
different set-ups, as shown by Marco Schubert from Kroenert, the
results of th e application process such as even and appealing coating are affected by physica l aspects of such as viscosity ami temperature. Mirko Rin co from Bobst Italia introduced the pros and
cons of an altemative appli cation method: using slot dies for hot
melt coating. Howeve r, the best application system will fail, where
hot melt enemy number I strikes: char. Guido Schurmann from
ITW Dynatec showed how easy it is to ban thi s enemy from the
production si te: when softenin g point and temperature versus viscos ity curve of th e adh es ive are known, so that the lowest possibl e temperature for th e process can be regulated and pain is taken
that no fitters an d packag ing residues contaminate th e adhesive,
the appropri ate system (melter and application head) can be chosen. 1·loses transportin g th e ho t melt should be installed permanentl y. 1·loses and application heads should have th e dimensions
suited to the process. If on top optimal cleaning and maintenance
cycles are maintained, th ere is no reason why char should not be
. history.
Copyright Coating Intemational2015
Review MKVS
Where adh es ion in co mpos ite materi als in volv ing PSA is a problem, thi s ca n be remedied by surface trea tm ent using th e plasma tools for surface acti vati on in reel-ta-reel PSA application s introduced by l osu H. Hoig Leibrandt from Helyon Plasma: a seri es or
matrix of single plasma jets, rotation nozzles and slot nozzles. ,The
ran ge of topics spanning from a currently very promising future
topic, printed electronics, and the various concepts for raw materials for and production of new adhesives, to basic resea rch of cross
li nking reactions and migration of mineral oil deri vati ves coming
fro m adhesives. All in all, every paper showed an interesting and
exci ting perspecti ve of the future of adhesives.» Dr Peter Barth,
Creati ve Network Consulting, chair of th e second day summed up
the papers given.
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Pressure Sensitive Adhes ive s
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40. MKVS 2015
One requirement of modern adhesives is that th ey can do so much
more th an just joi n two substrates. Given a fun ctionality, such as
electri ca l conductivit y, Ihey ca n be the ba se for hybrid products
merging pri nted elec troni cs and sili con elec troni cs. Wolfgang
Mildner from MSWtech showed th at many exciting applications of
this techn ology could be possible once specific requiremen ts have
been addressed and fu rther research has taken place. A barrier
against water vapour is th e fun cti onality add ressed by Ferdinand
Ru ess from the Fra unhofe r Institute fo r Process Engineering and
Packaging IVV. Additives containing active wa ter vapou r absorbing nanoparticles can achieve this. His research for OLED packaging with high barrier film shows that the barrier propelties are not
only effected by th e th icl, ness of th e acti ve layer and the mass
amount of nanoparticles in the ad hesive, but also by th e location
of th e ac tive layer in the barrier stack and by th e number of barrier layers. Also, the fu ncti onal adhes ive requires fu rther developmen t regardin g both cohes ion and adh es ion in th e fi lm composite.
Wh ere adhes ives need la be slicky in a humid environment, as is,
for example, th e case in th e constru cti on industry, Or An ke Lewin
from Evonik Nutrition & Care revea led th at silane-modified polymers with lateral crosslinking groups, s o~alled ,N EW- SPs» that
react with humid ity can be a game changeI'. They are also an interesting class of ralV material for r SAs curable after application in
the presence of humidi ty and they offer nelV possibilities for adhesive formu lati on developments to reac t to growi ng or changing
market requirements.
Cross li nk ing is, accord ing to Pro f Dr Zbigniew Czech from West
Pom eran ian Un ive rsity of Technology Szczeci n, a recurrent theme
Copyright Coating Internati onal 201 5
in many r SAs application s, as it influences th e bul k properti es of
th e adhesive film and builds shea r, heat and chemical reSistance,
whil e nega tively impacting tacl< and pee l. One exa mpl e for a
cross linking agent are UV cro sslinkabl e materi als. They have
grown tremendously over th e past. As l an Scheffel from Biolin k
explained, using UV-LED on certain formulati ons in PSA-Production can lead to certain properties in adhesives.
Adhesives may also have certain undesired side effects. Molecules
from their formu lation can migrate into the packaged foodstuffs
and at best only change smell and taste, at worst be detrim ental to
Ihe heaith of the person ingesting the contaminated food. Migrating minera l oil re sidues are an example of the latter. With th e
packaging substrates in food packaging now being available with
effec ti ve barri er coa tings against th ese molecules, Martin Lommatzsch, PhD stud ent of TU Dresden, Chair of Food Science and
Food Contact Materials, took th e topic one step further. In cooperation with th e GC Departm ent of Kantona les Labor Zuri ch,
Sw itzerland, he researched the migrati on potential of hydrocarbon
resins usecl as lackifiers in HMA and (HM)PSA. His findings were
that there had been a con tamination of th e foodstuff researched
with oligomel; from the adhesives used in Ihe packaging. However, th ey also showed that both analysis and interpretation of th e
resuits obtained are di fficult, more especially as there is no sufficient inform ation avai lable to the toxici ty of th e migrated substances. When the migrating molecules change the odour of th e
packaged foodstuff, thi s is the result of polymeri za ti on, degradation of raw materials and th e additives used in the hot melt adhesive. According to Dr Th omas Hopfmann from Add iva nt, the most
powerFul and versatile choice is to use an appropriate 101V odour
ant ioxidant pacl,age. However, as Prof Dr Dirk Burth from Mu nich
University of Applied Sciences shows, diffusion of certain molecules can also have an effect on oth er ad hesive prope rti es. I-li s
research of raw materials rega rding diffusion, perm ea ti on, and solubi lity of single raw materials in PSAs put th e PSAs behaviour in
a new perspec ti ve_ Furthermore, two oth er raw materials used in
formulating adhesives were presented: lactide based co-polymer
technology pproviding excellent stabil ity and processa bi lity
and improved adhesion introduced by Chris Schael,ens from
Corbion Purac Biochem, and so-called cabo t particles presented
by Eli zabeth Sims from Cabot Corporation. Cabo t particl es are
a pour-in means of introducing fum ed silica particles into waterborne pressure sensitive adhesives . Formu lat ion ti me can be
shortened by this technology, as the step of first creating a silica
dispersion from the dry powder fall s away. Thi s met hod also
increases processability and performan ce becau se the distributi on
of sil ica remains constanllhroughout processing, as we ll as during drying and coalescence of th e adhesive film . Th is can result in
signifi cant improvements in cohesive shear strength and therm omechanical properti es of water borne pressure sensiti ve adhesives. Dr Anja Schneider from Henkel provided ano th er approach
to sustainability: a new technology approach to higher total solid
solvents. Broader formulating capabilities with 10 - 15 % higher
solid systems than conventional solvent PSAs and coa table viscosity improve coatel' efficiency_
«The third day of th e 40. Munich Adh esives & Fin ishing Sympasium was especially dedicated to con tribution s having to do with
tape maski ng and mounting applications. Furthermore, the focu s
12(2015
Coating
117
was put on the use of in novati ve silicone polymers in both fi elds,
as high perform ing PSAs as we ll as in the release materials fi eld
- what always stimulated questions from th e audience.' Stephan
Hinterwaldn er fro m M KVS GbR, th e event' s co-organize r and
chai r of th e last day, sums up the papers g ive n. As ked about the
trends he noted in th e papers given, he especially referred to ,Dr
L. Berger of Seki sui Alveo with his con tributi on .,polyolefi n Foam s
for th e Pressure Sensiti ve Tapes - Sta te of th e Art and Oulloolo).
And explained furt her: «He demonstrated in which way mod ificati on of the foam surface might improve produ ction process, quality and rel iabil ity of fo am tape s. The trend is also here, that
through a close coo perat ion of end user, tape, adhesive and foam
manufac turer doors open for even furth er new appli ca tions.' Of
cour-se the event was also a moment to show and tell about inn()va tion s. For Mr Hi nterlValdner ,Noteworthy new developments
we re presented e.g. by Lohmann with their functional adhesive
tapes for local anodization of aluminum avoiding the classical bath
RECORD NUMBERS. The 171h edition of ITMA, th e global tex til e
machinery event held in Mi lan from November 12- 19,2015,
wh ich just closed in Milan, was a great success for Italian textil e machinery manufacturers. As ACI MIT President Haffaella
Carabelli stated, ,Visitor attendance recorded wa s the highest
ever, and ex hibitors are broadly sati sfi ed.' For th e eight days
of th e event, th e hall s, wh ich hosted th e 1,700 ex hibitors,
re co rd ed almost 123,000 participants, hail ing from 147 Countries (22% more than the previou s edition in Barcelona). However, it is i n the number of unique visitors th at M ilan marked
a record increase: +4 2% compared to Barce lona in 201 1, and
+8% compared to Mun ich i n 2007. Si milar statistics had never
before been record ed in th e si xteen prev iou s edition s of
ITMA . Italy ranked first overall i n th e number of ex hibiting
companies (454). as well as visi tors (18% of th e tota l). Behind
Italy among th e main countries with most visito rs were Ind ia
process and by Dymax wi th their SpeedMask®, a light curing solve nt free on e compone nt system for application s on geometrically
complex surfaces.»
Next year, at the 41 st Munich Adh esives and Finishing Symp(}sium 2016, hot melts, hot melt PSAs and ex trud able film s wit h a
special focus on ba se materi als, co nve rtin g and app li cations wi ll
take centre stage at th e Conference Centre of th e Sheraton Arabellapark Hotel in Mu nich, Germ any, from October 17- 19, 20 16.
The ca ll for papers is on-goi ng until Ap ril 30, 2016, by when title
and abstract (max. one printed page in Engli sh and/o r German)
of th e respective innovative technica l paper need to be submitted. Parties will be notified that th eir paper was accepted by May
08,2016 and th e full paper to be included i n the proceedings is
requested by Augu st 31, 2016, in English and/o r German .
MKVS GbR, 0-85614, Kirchseeon bei Munchen, www.mkvs.de
and Turkey (around 8% each of total attend ance ), Germany
(7%), followed by France, th e Uni ted States, Iran, Brazil and
Pakistan. In addition to industry opera tors, over 4,000 students
also attended ITMA, whi le media representatives in th e press
hall numbered 400 in total. In conc lUSion, the President of
AC IMIT stated ahis edition will be remembered not just for its
record numbers, but also for the message it has tra nsmi tted,
concerning sustainable innovation. Th e trade fair pavilions in
Rho exhib ited a great many technological innovations that
focu sed on a quest for greater susta inabi lity in tex tile producti on processes. Susta i nability and innovation : a comb ination
that wi ll represent the key to a success fu l future for many manufacturers.• The next edition of ITMA will be held at the Fira de
Barcelona Gran Via from Ju ne 20-26, 2019.
ACIM IT, 1-201 23 Milano, www.itma.com
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