Dental and Medical Applications - Evonik Hanse

Dental and Medical
Applications

Product Portfolio

About Us

Evonik, the creative industrial group from The broad range of products offered by
Germany, is one of the world leaders in Evonik Hanse GmbH reflects the exten-
specialty chemicals. Its activities focus on sive variety of requirements specified by
the key megatrends health, nutrition, re- our customers. For more than 20 years we
source efficiency and globalization. Evon- have led the way with trail-blazing re-
ik benefits specifically from its innovative search while constantly monitoring the
capability and integrated technology plat- latest trends in various industrial sectors.
forms. We apply our creativity daily to Always a step ahead of market develop-
new, future-oriented solutions, aligning ments, we offer you solutions to tomor-
ourselves to future markets with highly row’s application requirements – today.
promising growth dynamics, and develop-
ing essential and indispensable solutions
for our customers.

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The Evonik Hanse GmbH offers a wide range of base materials which can be used in
formulations for dental impression materials, bite registrations and composite fillers.

Polymers for addition-curing silicones
• Polymer VS
• Polymer RV page 4

Crosslinkers
• Crosslinker 100 series
• Crosslinker 200 series page 6

Reinforcing Fillers
• VQM series
• Compound VS page 7
Catalysts and inhibitors
• Catalyst 500 series
• Inhibitor series page 10

Reactive diluents and chain extenders
• Polymer MV
• Modifier 700 series page 12

Raw materials for nanoparticle modified composite fillings
• Nanocryl® D page 14

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Polymers for addition-curing silicones

Polymer VS – Vinyl-functional polydimethyl siloxanes

The products of the Polymer VS series They serve as a base polymer in addi-
are vinyl-terminated polydimethyl silox- tion-crosslinking silicone formulations.
anes with different viscosity levels and Polymer VS is also available in viscosities
molecular weights, and an extremely other than those listed below.
low content of volatile constituents.

Technical data Viscosity at 25°C Vinyl content
[mPa∙s] [mmol/g]
Product name 50 0.60
Polymer VS 50 100 0.40
Polymer VS 100 200 0.25
Polymer VS 200 500 0.14
Polymer VS 500 1,000 0.11
Polymer VS 1000 2,000 0.08
Polymer VS 2000 5,000 0.06
Polymer VS 5000 10,000 0.05
Polymer VS 10000 20,000 0.04
Polymer VS 20000 65,000 0.03
Polymer VS 65000 100,000 0.02
Polymer VS 100000 165,000 0.015
Polymer VS 165000

Application Polymer VS can be used for a wide
Polymer VS cures by a platinum-cata- range of applications by selecting the
lyzed addition reaction with silicone suitable crosslinkers (Crosslinker 100
crosslinkers containing SiH groups. Due series, Crosslinker 200 series), catalysts
to the low content of volatile constitu- (Catalyst 500 series), additives and fill-
ents and the crosslinking mechanism, ers (VQM, Compound VS).
the curing shrinkage remains low and no
volatile or corrosive substances are
formed while curing.

4

Polymer RV – Vinyl-functional polydimethyl siloxanes

Products of the Polymer RV range are vi- groups. On account of this structure,
nyl-functional polydimethyl siloxanes of they produce higher crosslinking densi-
different molecular weights carrying ad- ties than Polymer VS at similar viscosity
ditional lateral vinyl groups in the polysi- levels.
loxane chain besides terminal vinyl

Technical data Viscosity at 25°C Vinyl content
[mPa∙s] [mmol/g]
Product name
Polymer RV 100 120 0.5
Polymer RV 200
Polymer RV 5000 360 2.3

3,000 0.4

Application crosslinkers (Crosslinker 100 series,
Polymer RV can be used as a base poly- Crosslinker 200 series), catalysts (Cata-
mer or as an additive with Polymer VS. It lyst 500 series), additives and fillers
cures by a platinum-catalyzed addition (VQM, Compound VS).
reaction with silicone crosslinkers con-
taining SiH- groups. The formulator can
adjust the formulation properties over a
wide range by selecting the suitable

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Crosslinker

Crosslinker 100 und 200 series

The crosslinkers of the Crosslinker 100 viscosity levels and SiH contents. Other
and 200 series are polydimethyl silox- SiH contents and viscosity levels can be
anes comprising SiH groups in the poly- delivered upon request.
mer chain. The crosslinkers of the Cross-
linker 200 series include terminal SiH
groups. Both crosslinker types are used
in polyaddition silicones.
Both series are available with different

Technical data SiH content Viscosity at 25°C
[mmol/g] [mPa∙s]
Product name 7.8 45
Crosslinker 100 4.3 45
Crosslinker 101 3.8 100
Crosslinker 110 1.1 500
Crosslinker 120 2.1 500
Crosslinker 125 16 20
Crosslinker 190 3.2 50
Crosslinker 200 4.2 40
Crosslinker 210

Application the formulation structure is available
When working with two-component sil- upon request.
icone formulations, it must be ensured Particular attention should be paid to the
that Pt-catalyst (e. g. Catalyst 500 se- fact that silicones containing SiH may
ries) and SiH crosslinkers are kept strict- generate hazardous hydrogen gas in
ly separated. connection with certain pollutants. For
further information, please consult e. g.
In general, the composition must be se- www.silicones-safety.com.
lected so that the total formulation con-
tains approximately a double molar ex-
cess of SiH groups as compared with
vinyl groups. Further information about

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Reinforcing Fillers

VQM – Vinyl-functional QM resin compounds

The VQM products are formulations com-
prising a vinyl-functional QM resin and
vinyl-functional silicone polymers. They
are used for producing transparent and
filler-free formulations with good me-
chanical properties or for improving the
mechanical properties of filled systems.

Technical data

Product name Filler content Viscosity at 25°C Vinyl content
VQM 803 medium [mPa∙s] [mmol/g]
VQM 806 medium 10,000 0.20
VQM 807 medium 52,000 0.21
VQM 809 medium 5,800 0.21
VQM 881 high 1,300 0.23
VQM 885 high 800 0.68
VQM 3/1603 medium 12,000 0.50
VQM 1773 high 18,500 0.19
67,000 0.37

Application It should be noted that the VQM prod- 100 / 200 series). Further information
The VQM products can be used in trans- ucts have a higher vinyl content than about designing formulations with VQM
parent silicone formulations, substituting Polymer VS types of similar viscosity. In is available upon request.
Polymer VS partly or completely. In general, this must be compensated by
filled formulations, the filler can also be increasing the SiH content (Crosslinker
partly substituted by VQM.

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Compound VS – Fumed silica dispersions

Compound VS are masterbatches con- surface-modified fumed silica (SiO2) and
sisting of fumed silica and a vinyl-func- around 70% of vinyl-functional silicone
tional silicone polymer. They are used for
producing formulations with good me- polymer.
chanical properties or for improving the
mechanical properties of filled systems.
Compound VS consists of around 30% of

Technical data Viscosity at 25°C Vinyl content Refractive index nD20
[Pa∙s] [mmol/g] 1.412
Product name 100 0.07 1.412
Compound VS 100 3,000 0.07 1.413
Compound VS 3000 6,000 0.07 1.414
Compound VS 6000
Compound VS 9000 9,000 0.04

Application addition-curing silicone. Therein the sili-
The mechanical strength of a silicone for- ca content was increased from 0 to 30%
mulation depends directly on its silica by a stepwise replacement of Polymer VS
content (i. e. tensile strength, elongation 1000 by Compound VS 100.
at break and tear resistance increase). At
the same time, viscosity also rises sub-
stantially. This behavior is shown by the
below example of a two-component

Composition of formulation

Raw material Component A Component B
Compound VS 100 [g] [g]
Polymer VS 1000 0 – 100 0 – 100
Catalyst 510 100 – 0 100 – 0
Inhibitor MVC 0.8 ––
Crosslinker 210
–– 0.2

–– 10

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Product hardness and viscosity 40,000 Viscosity [mPas] Due to its production process, Com-
30,000 pound VS enables higher mechanical
50 20,000 strength at similar viscosity levels
40 10,000 when compared with silica used as a
30 powder. Moreover, it avoids the use of
0 powders in the formulation process
Shore A 20 100 (dust generation).
10
In existing formulations, Compound
VS can be used as a substitute of Poly-
mer VS and of the filler. Further infor-
mation about the formulation structure
is available upon request.

0 25 50 75
0 Content of Compound VS [%]

Shore A Viscosity [mPas]

Tensile strength [N/mm2] Mechanical properties 400 Elongation at break [%]
Tear resistance [N/mm] 300
20 200
15 100
10
0
5 100

0 25 50 75
0 Content of Compound VS [%]

Elongation at break [%] Tear resistance Tensile strength

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Catalysts and Inhibitors

Catalyst 500 series – Platinum-catalysts

The products of the Catalyst 500 series complex. The media offered include
are diluted solutions of a highly reactive Polymer VS, divinyl tetramethyl disilox-
platinum complex in different media. ane (DVS) and methyl vinyl cyclosiloxane
Evonik Hanse GmbH offers two different (MVC).
complexes: the divinyl tetramethyl disi-
loxane-platinum(0)-complex and the
methyl vinyl cyclosiloxane-platinum(0)-

Technical data Complex Medium Platinum content Platinum content Viscosity at 25°C Vinyl content
DVS Polymer VS [ppm] [wt%] [mPa∙s] [mmol/g]
Product name DVS Polymer VS 500 0.05 500 0.16
Catalyst 500 DVS Polymer VS 5,000 0.5 500 0.16
Catalyst 510 DVS Polymer VS 10,000 1.0 500 0.16
Catalyst 511 DVS DVS
Catalyst 512 MVC MVC 20,000 2.0 500 0.16
Catalyst 517
Catalyst 520 20,000 2.0 5 10.8

20,000 2.0 5 11.5

Application Contact with such substances shall be they prevent uncontrolled increase of the
The platinum complexes are highly effi- avoided both while producing the formu- crosslinking rate due to the inhibiting
cient even in very small quantities so that lation and while the product cures. media DVS and MVC.
typically, only 10 to 20 ppm of platinum
are used in formulations. Increasing the If the application imperatively requires
concentration leads to higher crosslinking for such a contact (e. g. curing in a PU
rates, and thus to shorter pot lives. mold), the catalyst loss can be compen-
sated by an increased feedstock concen-
It should be noted that the complexes re- tration of up to approximately 100 ppm.
act sensitively to a number of substances Especially the products Catalyst 517 and
(e. g. sulphur, heavy metal and amino 520 are suited for this purpose because
compounds, some PU and PVC types).

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Inhibitors for addition-curing silicones

Inhibitors are used for setting the pot life
of platinum-catalyzed, addition-cured
silicones.

Technical data Base Volatility Viscosity at 25°C Vinyl content Appearance
MVC pure Low [mPa∙s] [mmol/g] Clear, colorless liquid
Product name DVS pure Medium 4 11.7 Clear, colorless liquid
Inhibitor MVC DVS Medium 4 10.7 Clear, colorless liquid
Inhibitor DVS MVC Low 500 1.2 Clear, colorless liquid
Inhibitor 200 Alkinol Medium 700 1.3 Slightly turbid, colorless liquid
Inhibitor 300 Alkinol Medium 700 0.1 Slightly turbid, colorless liquid
Inhibitor 400 Alkinol High 800 0.1 Slightly turbid, colorless liquid
Inhibitor 500 900 0.1
Inhibitor 600

Application Technical data Inhibitor dosage for a working time
Inhibitors MVC and DVS are pure sili- of 40 minutes
cone-based inhibitors which control the Raw material Comp. A [g] Comp. B [g]
activity of the Pt-catalyst. They are used Polymer VS 500 44 78 Dosage [g]
when exceptionally long working times or Quartz powder 55 -
very low dosage levels are required. The Hydrophilic silica 0.4 - 5
typical dosage is between 0.01 and 1%. 21 4
Inhibitors 200 – 600 are ready-to-use Crosslinker 101 - - 3
mixtures of various alkinol or silicone varied 2
based inhibitors in Polymer VS. Depend- Catalyst 512 0.12 1 1
ing on the required pot life, the dosage is 0
typically between 1 and 10%. Inhibitor -
The below diagram shows the effect of 200 300 400 500 600
the various inhibitor solutions in a two Mixing ratio 9
component addition-cure silicone formu-
lation. It shows the required inhibitor con-
centration to get a working time of 40
minutes.

11

Reactive diluents and chain extenders

Modifier 700 series – Chain extenders for vinyl-functional
silicone polymers

Modifier 705 and Modifier 715 are SiH- (Polymer VS). Use of the modifiers re-
terminated polydimethyl siloxanes which duces the crosslinking density and there-
are used as plasticizers in addition-curing fore the elastomer hardness.
silicones. Due to their difunctional struc-
ture, these products do not react by
crosslinking, but by extending the chains
of vinyl-terminated silicone polymers

Technical data SiH content Viscosity at 25°C
[mmol/g] [mPa∙s]
Product name
Modifier 705 0.16 500
Modifier 715
3.40 3

Application tion must in particular be paid to the fact
Use of the modifiers allows obtaining that silicones containing SiH may gener-
products with a low Shore hardness, ate hazardous hydrogen gas in connec-
even when using low-viscosity vinyl tion with certain pollutants.
polymers. These modifiers are therefore More information can be found on
used in formulations that have a low vis- www.silicones-safety.com.
cosity prior to crosslinking and should
have low Shore hardness after crosslink-
ing. Another important modifier applica-
tion is the formulation of silicone gels.

When working with two-component sil-
icone formulations, it must be ensured
that Pt-catalyst (Catalyst 500 series) and
modifier are kept strictly apart. Atten-

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Polymer MV 2000 – Mono-vinylfunctional polydimethyl
siloxane

Polymer MV 2000 is a polydimethyl si- functional structure, only one chain end
loxane that is vinyl-terminated on one of the silicone polymer reacts with the
side, thus achieving a reduction of modu- network. This prevents migration effects.
lus and hardness in addition-curing sili-
cone formulations. Due to the mono-

Technical data [mPa∙s] 2,000
[mmol/g] 0.06
Viscosity (25°C)
Vinyl content

Application
The following formulation shows the
lower hardness achieved with Polymer
MV 2000 as compared with a similar
formulation containing the correspond-
ing difunctional vinyl silicone (Polymer
VS 2000):

Formulation with Polymer MV Formulation with Polymer VS

Component Parts Component Parts

95 g Polymer MV 2000 95.0 95 g Polymer VS 2000 95.0

0.4 g Catalyst 510 0.4 0.4 g Catalyst 510 0.4

0.1 g Inhibitor DVS 0.1 0.1 g Inhibitor DVS 0.1

3 g Crosslinker 101 3.0 3 g Crosslinker 101 3.0

Hardness of vulcanized formulation Hardness of vulcanized formulation

Shore A 1 Shore A 26

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Nanocryl® D – Raw materials for nanoparticle
modified dental composite fillings

Nanocryl® D are composites of spherical Key properties
silica-nanoparticles with a diameter of 20 • Extremely high filler level at low
nm in (meth)acrylate resins.
viscosity
• Reduced shrinkage
• Improved flexural strength
• Reduced abrasion
• High stability under load
• Increased lifecycle of composite

materials

Product overview

Product name Monomer Mixture SiO2-content [wt%] Viscosity at 25°C
Nanocryl® D 110* Trimethylol propan triacrylate 50 [mPa∙s]
Nanocryl® D 120* alkoxyl. Pentaerythritol tetraacrylate 80 : 20 50 3,000
Nanocryl® D 301* Triethylene glycol dimethacrylate 90 : 10 50 1,500
Nanocryl® D 302* 60 75
Nanocryl® D 303* Hydroxy propyl methacrylate 60
Nanocryl® D 322* 50 150
Hydroxy ethyl methacrylate
Nanocryl® D 323* 150
Urethane dimethacrylate and
Triethylene glycol dimethacrylate 7,500
Urethane dimethacrylate and
Hydroxy ethyl methacrylate 50 15,000

* not available in the USA

Property improvement The large amount of nanoscale SiO2 par-
Nanocryl® D enables the production of ticles decreases the abrasion, making the
base resins for composite materials surface smoother and hence better to
which contain up to 60% SiO2 and yet polish. Both toughness and hardness of
remain low-viscous and free-flowing. the composite also increase as does,
Therefore, the combination of Nanocryl® D consequently, the lifetime of the filling
with conventional fillers enables much in the mouth.
higher filling ratios than using conven-
tional fillers alone, thereby reducing the
shrinkage significantly.

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How it works This results in a very low viscosity for the particle number density Particle size distribution of the
Nanocryl® D products are colloidal dis- dispersion despite high SiO2 contents. nanoparticles in the composite
persions of up to 60 wt% of amorphous (determined by SANS)
silicon dioxide in a wide range of conven- The nanoparticles are produced from
tional unsaturated (meth)acrylate mono- aqueous sodium silicate solution in a 0 20 40 60 80 100
mers and oligomers. The dispersed phase chemical process. In this very mild pro- particle size [nm]
consists of surface-modified, spherically cess the binding agent is not damaged, in
shaped SiO2 nanoparticles with diameters contrast to the processes in which filling
of 20 nm having an extremely narrow agents in powdered form are dispersed
particle size distribution. with dissolvers and the application of
very high shear energy.
In contrast to conventional micro-filler
composite materials, the spherical parti-
cles are distributed homogenously and
agglomerate-free in the resin matrix.

Application The required silicon dioxide total con- To achieve the highest possible solids
To ensure optimum compatibility, we tent in the ready formulation is depen- content, the additional use of conven-
recommend premixing all other recipe dent on the desired product properties. tional fillers is recommended. The
components and adding the Nanocryl® D In general, the property improvements nanoparticles then fill the space between
to this mixture under stirring. increase proportionally to the solids con- the larger particles. This enables the for-
tent. As a result, as high a SiO2 content mulator to increase the total content of
Nanocryl® D products are compatible as possible is recommended (≥ 20 wt%, reinforcing fillers, and thus optimize the
with most acrylate monomers, oligomers corresponding to e. g. ≥ 40% Nanocryl® D) material properties.
and polymerization initiators. Neverthe- for first screening tests. The optimum
less, compatibility with the individual for- content should then be ascertained
mulation components should be tested through systematic tests.
separately prior to recipe development.

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This information and any recommendations, technical
or otherwise, are presented in good faith and
believed to be correct as of the date prepared.
Recipients of this information and recommendations
must make their own determination as to its suitabil-
ity for their purposes. In no event shall Evonik as-
sume liability for damages or losses of any kind or
nature that result from the use of or reliance upon
this information and recommendations. EVONIK
EXPRESSLY DISCLAIMS ANY REPRESENTATIONS
AND WARRANTIES OF ANY KIND, WHETHER
EXPRESS OR IMPLIED, AS TO THE ACCURACY,
COMPLETENESS, NON-INFRINGEMENT, MER-
CHANTABILITY AND/OR FITNESS FOR A PAR-
TICULAR PURPOSE (EVEN IF EVONIK IS AWARE
OF SUCH PURPOSE) WITH RESPECT TO ANY
INFORMATION AND RECOMMENDATIONS
PROVIDED. Reference to any trade names used by
other companies is neither a recommendation nor
an endorsement of the corresponding product,
and does not imply that similar products could not
be used. Evonik reserves the right to make any
changes to the information and/or recommendations
at any time, without prior or subsequent notice.

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Evonik Hanse GmbH Evonik Degussa Evonik Goldschmidt Corp.
Charlottenburger Straße 9 Specialty Chemicals Co, Ltd. 914 E. Randolph Rd.
21502 Geesthacht 55, Chundong Road P.O. Box 1299
Germany Xinzhuang Industry Park Hopewell, VA 23860
Phone  +49 4152 8092-0 Shanghai, 201108 USA
fax  +49 4152 79156 PR China Phone  +1 804 541-8658
[email protected] fax  +1 804 541-2783
www.evonik.com/hanse Phone  +86 21 6119-1125
fax  +86 21 6119-1406

07/2015 Inv.-Nr.: 24-15