SYNOXOLTM

BEPD / BEPD70L

Chemistry you can see

High performance diolfor polyester resins
in coil coatings
FLEXIBILITY

HARDNESSUV RESISTANCE

BEST OFBOTH WORLDS

Delivering the best balance of flexibility and hardness
Mechanical properties of coil coatings strongly influence their performance. The coil coatings on metal sheet substrates
are regularly subject to mechanical and physical stress during the production process and the product lifetime. Stressoccurs in harsh environments or when the substrate undergoes dimensional variation, most significant when thecoil coating is used for outdoor applications. These stresses can result in film damage and reduce the lifetime of thecoating, which would shorten the lifetime of the asset. It is therefore important to have a balance among mechanicalproperties, especially flexibility and hardness. SYNOXOLTM BEPD delivers 0T-bend flexibility in polyester-based coilcoatings (ASTM D4145 / ISO 17132), whilst improving film hardness by 30% against the polyester-based coil coating
benchmark (Resin A) for outdoor applications (ASTM D4366 / ISO 1522).

Polyester Resin

Resin AResin B

Koenig Hardness

Resin D200SYNOXOL BEPD
Glycol Blend HDO(% w/w)
NPG

–

17.3

14.9

11.2

4.3

–

29.7

22.4

28.5

140

TMP

0.7

0.7

0.7

120

PIA

35.4

33.5

29.3

PA

14.9

14.1

14.4

ADA

8.1

7.7

12.2

OH Number (mgKOH/g)

33.6

32.3

31.0

Tg (ºC)		

1421

13

T-Bend Value		

0T

0T

0T

Acid Blend(% w/w)

Note: Measured viscosities of diluted resin samples (60% w/w solids) are allcomparable and within experimental error, therefore acceptable applicationand final cosmetic appearance can be maintained.

02180
160100Damping time (s)TM806040200
Coating A
NPG:HDO(75:25 mol% of glycols)

Coating B
NPG:HDO:BEPD(60:10:30 mol% of glycols)

Koenig Hardness
Note: The higher damping time the harder the coil coating film
*Tg adjustment with acid modification

Coating D*
NPG:BEPD(75:25 mol% of glycols)

STAND OUT WHEN
THE SUN IS OUT
Outstanding UV resistanceSYNOXOLTM BEPD is a branched hydrophobic diolthat imparts outstanding durability to polyester coilcoatings used in outdoor applications. The absenceof any ß-hydrogens along with UV resistance/ weatherability of the resultant ester leads to improved
UV resistance of the coatings containing SYNOXOLTM
BEPD in their polyester resin structure. The result isup to 90% gloss retention over 2 years South Florida
exposure test.
This opens up opportunities to formulate highly
durable polyester resins containing SYNOXOLTM BEPD,
which would deliver a RUV4 resistance to UV inaccordance with EN 13523-10 and EN 10169.

Gloss retention measured at 60º (%)
10090807060
50403020100
Coating A
NPG:HDO(75:25 mol% of glycols)

Coating B
NPG:HDO:BEPD(60:10:30 mol% of glycols)

Coating D
NPG: BEPD(75:25 mol% of glycols)South Florida outdoor exposure weathering at 45º angle
to the sun – gloss retention after 2 years

03

PERFORMANCEWITHOUT THE PRICE TAG

Technology positioning
SYNOXOLTM BEPD delivers a step change for polyester coil coatings,
challenging costly silicone modified or superdurable polyesters andPVDF-resins in outdoor applications.
0T-Bend flexibility without any compromise onhardness

Comparable UV durability at a cheaper cost thansilicone modified or superdurable polyesters
and 50% PVDF-resinsImproved hardness in comparison to 0T-bend
benchmarkBetter flexibility at a cheaper cost than silicone
modified or superdurable polyesters

Increased UV resistance for outdoor applications

Harder films at a cheaper cost than PVDF-resins

No impact on application viscosity or cosmetic
appearance

Better compatibility and workability than siliconemodified polyester and PVDF-resins

Allows formulation of polyester coil coatings todeliver a RUV4 UV resistance

Synoxol
BEPD PES
Flexibility

StandardPES

SI –PES

70%
PVDF

04

Delivers OT-BendSynoxol
BEPD PES

Synoxol
BEPD PESTM

SI –PES

50%
PVDF

70%
PVDF

SI –PES

StandardPES

Cost

Hardness

70%
PVDF

TMStandardPES

Cost

Flexibility

Delivers OT-Bend
UV Resistance

50%
PVDF

TMHardness

Delivers OT-Bend

Cost

UV Resistance

50%
PVDF

Don’t let your money
evaporate into thin air
Replacing parts of NPG with SYNOXOLTM BEPD
in resin formulations lowers the viscosity ofpolyesters while retaining suitable Tg. This makes
it possible to produce polyester resin solutions
with reduced viscosity at the same resin solids,
consequently allowing coil coating formulators toreplace some of the solvent with higher density
fillers or extenders whilst maintaining flow andlevelling properties of the final product. The result
is a coil coating with less solvent (VOC), higher
volume solids, higher theoretical spreading rate
(TSR, m2/litre) and improved cost/m2.

TSR (m2/L) =Paint Volume Solids (%) x 10

Coating Cost/m2 =Additional solvent in coating to control
viscosity, flow and levellingSolvent
Additives
Pigment/Filler/Extender
Solvent

Polyester Resin

Dry Film Thickness (µm)
Coating Cost/LTSRPolyester Resin Solution(typically 60% w/w solids)

SYNOXOLTM BEPD allows polyester resin producers to formulate high value products where the resin cost/kg
can be mitigated by increased volume solids. This means that a larger surface area of the metal can be coatedwith the same amount of coating at the same dry film thickness.

05

Leading in emulsions
and speciality polymers
Synthomer is one of the world’s leading suppliers ofemulsion and speciality polymers supporting leadership
positions in many market segments including coatings,construction, technical textiles, adhesives, paper andsynthetic latex gloves. The company has its Head Office inLondon (UK) and provides customer focused services fromoperational centres in Clevland (US), Harlow (UK), Marl(Germany), Kuala Lumpur (Malaysia), Shanghai (China) andDubai (UAE).

In April 2020, we acquired OMNOVA Solutions Inc., aUS-based speciality chemical company. The acquisitionof this highly complementary business extends ourgeographic reach, particularly in North America and Asia,and expands our global platform. Synthomer is able toserve through a strong network of local technical service
and sales branches, supported by regional application
development and production in our key markets. We deliver
the right formula, globally, individually.

This information or data including any advice or recommendation(s) provided by us (collectively “Information”) are not intended to, nor do they, constitute professional advice orservices. Information is provided only as of the date hereof on an “AS IS” and “AS AVAILABLE” basis and we do not warrant the accuracy, timeliness or completeness of theInformation. To the maximum extent permitted by applicable law, Synthomer disclaims (i) all implied warranties, including as to continued production, fitness for purpose,
non-infringement and merchantability; (ii) all liability arising out of the application or use of any product (including infringement of third party intellectual property rights); and (iii) all liability,
including without limitation, for special, indirect or consequential losses.
Any Information concerning any possible use or application of Synthomer products is given by us in good faith and it is entirely for the recipient to satisfy itself fully as to the suitabilityof Synthomer products for any particular purpose. Synthomer products are sold in accordance with Synthomer’s standard terms and conditions of sale which are available fromwww.synthomer.com/tc.
Synthomer owns all right, title and interest in the Information and all other intellectual property rights and data associated with this information without limitation. All trademarks andlogos are the property of Synthomer. Copyright © 2020 Synthomer, all rights reserved.

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Version: 1. December 202006