POLYISOCYANATES PREPOLYMERS DISPERSIONS UV SYSTEMS
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CONTENTS

Bayer MaterialScience

SCIENCE FOR A BETTER LIFE 4

Aqueous high molecular weight 

acrylic dispersions

BAHYDROL® AH 6

Aqueous high molecular weight 

polyurethane dispersions

BAHYDROL® UH 7

Aqueous acrylic polyol dispersions 

for waterborne 2K polyurethane systems

BAHYDROL® A 8

Aqueous polyurethane polyol dispersions

for waterborne 2K polyurethane systems

BAHYDROL® U 9

Waterdispersible polyisocyanates

BAYHYDUR® 10

Radiation curing polyurethane dispersions

BAYHYDROL® UV 11

Polyisocyanates for 2K polyurethane systems

DESMODUR® 12

Aromatic prepolymers for 1k and 2K 

polyurethane systems

DESMODUR® E 13

Polyaspartic esters for very high 

solids coatings

DESMOPHEN NH® 14

Polyester polyols for 2K 

polyurethane coatings

DESMOPHEN® 15

Unsaturated acrylates and polyesters 

for UV radiation curing

DESMOLUX® 16

Key to the abbreviations 18

POLYISOCYANATES PREPOLYMERS DISPERSIONS UV SYSTEMS 3
An unbeatable variety is the basis

for our expertise

Our wide range of products is the result of

our work in developing binders and

processes. Bayer MaterialScience can offer

a variety of customised raw materials and

building blocks for the formulation of your

wood coatings. In other words, Bayer

MaterialScience supplies tried-and-tested

solutions for many problems and wood

coating applications.

If you have a problem, please contact our

technical staff who will apply their

creativity to develop solutions and test

them under near-service conditions – the

kind of approach the market needs. 

Being a system supplier also enables us to

develop raw material packages in which

our products are tailored for use together.

This saves you time, money and a great

deal of trial and error. Because our range

of products is one of the broadest and

largest on the market, we are able to offer

constructive solutions and highly effective

support.

Close to the customer

We at Bayer MaterialScience are innovative.

This is borne out by nearly 100 years of

experience which places us under an

ongoing obligation. 

Whether for trade or industrial use, the

requirements specified by our customers

define the focus of our development efforts,

e.g. new technologies, time-saving

application and cost-effectiveness.

We supply products for all application

methods such as spraying, roller- or

curtain coating, rolling and brushing, i.e.

including those where material wastage is

avoided and high application efficiency

achieved. There is growing demand for

uncomplicated and short curing

processes.

Our Desmodur® and Desmophen® products

allow you to tailor the drying properties of

your coatings to suit your needs – either

two-pack, moisture-curing or air-drying, fast,

very fast or UV-cured. 

Highest level in properties, productivity

and at the same time environmentally

friendly – our ranges in aqueous and UV

curing raw material are suited to solve

any formulation problem today and in

future times. Our product ranges

Bayhydrol®, Bayhydur®, Bayhydrol® UV

and Desmolux® are impressing examples

of our innovations over the last 20 years.

Our short processes save time and

increase productivity. Your customers will

be grateful for your efforts.

BAYER MATERIALSCIENCE

SCIENCE FOR A BETTER LIFE

Innovation for quality and the

environment

It has always been a task of our

researchers to develop new products and

processes that meet market needs. We

cannot rest on our laurels but must

constantly review and improve both

products and processes. We have

implemented a DIN EN ISO 9001 quality

system and all our European facilities have

received certification to this standard. This

is the result of our efforts to supply our

customers with consistent high quality.

Your satisfaction with our products and

processes is our measure of success. 

A further task of our R & D is to ensure the

environmental compatibility of our

products. More than 30 years ago, Bayer

successfully launched UV-curing furniture

coatings. These were the first high-solids

solvent-free coatings for furniture. A major

contribution to the development of

environmentally friendly coatings has been

made with our water-thinnable Bayhydrol®

and Bayhydur® products for air-drying,

force-drying and radiation-curing coatings. 

Our market orientation provides impulses

for finding solutions to further problems,

e.g. reducing emissions and the

environmentally compatible disposal of

waste.

woosystems
5

A global partnership

If you operate on an international basis,

you can expect the same from your

business partners. Bayer MaterialScience is

one of the world's leading suppliers of raw

materials for wood and furniture coatings.

Our experienced team provides technical

back-up all over the world. Special

laboratories support our customer in all the

key furniture manufacturing centres in

Europe, North America, Japan and PR China. 

Bayer MaterialScience has agencies in more

than 100 countries. A contributory factor to

our leading market position is the

exchange of information with our partners

in the coatings industry. 

Innovative spirit and experience on both

sides have shaped an active partnership

over the last 90 years. In our dialogue with

our customers we are giving ideas for

developing new or improved products. We

can also assist in licensing and cooperative

ventures. Most of our products are

registered in chemical inventories and

therefore ready for sale in the most

important markets. The experts from

Coatings Business Development are

pleased to help anywhere in the world.

THE MAIN INNOVATIONS FOR THE MARKET OF WOOD COATINGS:

Bayer has set many global milestones in the development of coating 

raw materials over the last 90 years.

1905 Cellit: for low-flammable coatings

1929 Alkydal®: the first synthetic binder

1943 Desmodur®: first use of aromatic polyisocyanates as curing agents in coatings

1955 Roskydal®: wax-free unsaturated polyester resin

1960 Desmodur® N: a further step in the development of polyurethane coatings

1965 Desmodur® HL: aromatic/aliphatic polyisocyanurate (TDI/HDI)

1966 Desmodur® IL: TDI-based polyisocyanurate

1967 Roskydal® UV allows curing in seconds

1979 Desmolux®: urethane acrylate resins

1981 Desmophen® A 450: first fast drying polyacrylate

1987 Bayhydrol®: water-thinnable binder

1994 Bayhydur® and Bayhydrol® for aqueous two-pack polyurethane coatings

1997 Bayhydrol® UV

1999 Desmolux®: first aliphatic urethane acrylate with residual NCO groups

2002 Bayhydur®: new generation of hydrophilic polyisocyanates 

with excellent chemical resistance

2004 Desmodur® E XP 2605: moisture curing 1K PUR at drying speed of NC laquers

2005 Bayhydrol® PUR- and PUR-PAC-dispersions, free of solvent

2008 Bayhydrol® U: solvent free OH bearing PUR dispersion for 2K WB for systems

POLYISOCYANATES PREPOLYMERS DISPERSIONS UV SYSTEMS
1K dispersions for economic solutions BAYHYDROL and resistant coatings ® AH

Bayhydrol®

Dispersions

for ...

AH

Polyacrylate dispersions,

high molecular weight

2K waterborne coatings

1K waterborne stoving coatings

Radiation curing coatings

1K waterborne ambient curing coatings

Polyurethane/Polyacrylate 

hybrid dispersions

Polyacrylate dispersions,

OH-functional

Polyurethane dispersions,

OH-functional Polyurethane dispersions,

radiation curing

Polybutadiene based

copolymer dispersions

Polyurethane dispersions,

high molecular weight Polyester dispersions

A

U

E UH

UV

B

UA

The new generation of cosolvent-free acrylic

dispersions has been particularly developed

for one component application on wood.

The process of emulsion polymerisation is

used in producing these acrylic dispersions.

BAYHYDROL® AH: 

Aqueous high molecular weight

acrylic dispersions

BAYHYDROL® AH Solid content Neutralising Viscosity MFFT Properties and Application

AH XP 2741 40 NH3 20 58 High chemical and stain resistance, good wood wetting, 

0 for furniture and joinery markets.

AH 2797 XP 43 NH3 100 43 Self-crosslinking, fast and good blocking resistance, 

excellent sandability and chemical resistance.

[mPa.s at 23°C] [°C] [%] agent

BAYHYDROL®: 

Our Bayhydrol® Toolbox is classified with a

nomenclature according to the chemical

nature of the products, thus creating a

maximum degree of structure and clarity.

Our Bayhydrol AH range provides economic

solutions and resistant coatings, which are

well suited for furniture, interior joinery and

for parquet coatings, in some cases

combined together with polyurethane

dispersions.

woodsystems

'5,9,1**5((17(&+12/2*,(6
7

Fast drying polyurethane dispersions for tough BAYHYDROL and durable 1K and 2K coatings ® UH

POLYISOCYANATES PREPOLYMERS DISPERSIONS UV SYSTEMS

BAYHYDROL® UH Type Solid content Neutralising Cosolvent Viscosity MFFT Properties and Application

UH 240 aliphatic PUD 40 Na salt 0% 70 s1) 0 High elastic, for flexibilization of hard PAC and PU-dispersions.

UH 340/1 aliphatic PUD 40 Na salt 0% 70 s1) 2 High elastic, for flexibilization of hard PAC and PU-dispersions.

UH 2342 fatty acid mod. 35 TEA <5% NMP 100 0 Good BHMR, abrasion resistant, flexible, fast drying. 

aliphatic PUD Bayhydrol UH 2557 is its corresponding solvent-free version.

UH 2557 fatty acid mod. 35 TEA 0% 100 30 Good BHMR, abrasion resistant, flexible, fast drying.

aliphatic PUD

UH 2558 aliphatic PUD 38 TEA 0% 100 25 Hard, fast drying, abrasion resistant.

UH 2593/1 fatty acid mod. 35 TEA 0% 100 40 Good BHMR, hard, very fast drying.

aliphatic PUD

UH XP 2719 aliphatic PUD 40 TEA 0% 100 21 Hard, fast drying, fast blocking and high abrasion resistance.

UH XP 2592 aliphatic urethane 45 EDIPA 0% 300 <20 Oxidatively drying, for waterborne 1K coating with excellent

mod. alkyd weathering resistance on wood.

dispersion

1) Efflux time 4mm cup, method AFAM 2008/1050

Water-reducible wood and parquet coatings

have been in use on the market since the

mid-1980s. They show the highest growth

rates at present and within a short time

have become one of the leading system

types in the field of wood-, furniture- and

parquet coatings.

This achievement is due to a considerable

degree to their specific properties such as

mild odour, ease of application and rapid

drying. Bayer supplies proven raw materials

for waterborne systems under the

tradename Bayhydrol®. 

BAYHYDROL® UH: 

aqueous high molecular weight

polyurethane dispersions

Coatings based on these resins can be

easily applied manually or even industrially. 

They also satisfy high aesthetic demands

since, in contrast to older waterborne

acrylate-based coatings, they enhance the

wood grain without discoloring it.

Such systems are environmentally friendly,

have a long life and produce coatings which

are easy to apply and yield tough yet flexible

films.

The high level of properties profile achieved

with Bayhydrol UH in 1K coatings can become

even higher with the right choice of Bayhydur

in more demanding 2K coatings.

[%] agent content [mPa.s at 23°C] [°C]
Our Bayhydrol® A dispersions are OH group

containing resins tailormade to be

combined with our Bayhydur® range of

waterdispersible polyisocyanates. The

resulting waterborne 2K polyurethane

coatings combine the highest chemical and

mechanical resistance with versatile use

and application. Possible applications

include clear and pigmented furniture

coatings, interior and exterior joinery and

hardwood floor coatings.

BAYHYDROL® A: 

aqueous acrylic polyol dispersions

for waterborne 2K PUR systems

Building blocks for high end and low VOC

coatings systems matching solventborne performance

woodsystems

BAYHYDROL® A

BAYHYDROL® Solid content Neutralising Cosolvent OH content Viscosity Properties and Application

agent content

A 242 42 NH3 – 4.0 200 Topcoats with high chemical resistance, 

stain blocking primers.

A 2427 42 NH3 – 2.0 80 Fast drying/curing, chemical resistance.

A 2470 45 DMEA/ 8.0% 3.9 2,000 Hard and flexible, solvent resistance, 

triethanolamine SN100/PnB good wetting properties.

A 2651 40 DMEA 3.4% PnB 3.0 200 Hard and flexible, solvent resistance, good 

wetting properties, fast drying/curing.

A XP 2695 41 DMEA/ 7.6% PnB 5.0 2,500 Hard and flexible, highest chemical resistance.

triethanolamine

A XP 2770 45 DMEA 3.6% PnB 3,9 1,000 Low VOC version of A 2470, faster drying.

[%] [% on solid content] [mPa.s at 23°C]
BAYHYDROL® Solid content Neutralising Cosolvent OH content Viscosity Properties and Application

[%] agent content [%, on solids] [mPa.s at 23°C]

U XP 2750 43 DMEA 0% 3.6 1000 For high gloss clear and pigmented topcoats with 

excellent scratch and mar resistance and 

self-healing properties.

U XP 2755 38 DMEA 0% 3.0 3000 Very fast drying, high hardness and chemical

resistance, excellent appereance on wood.

U XP 2757 52 DMEA 0% 1.8 2250 Very elastic, especially recommended to achieve

natural and softfeel effect on wood.

U XP 2766 40 DMEA 0% 4.0 2000 Very high gloss, especially in pigmented coatings.

Fast drying and high chemical resistance.

9

The new generation of solvent-free OHfunctional polyurethane dispersions from

Bayer MaterialScience is further improving

the performance of waterborne

environmentally friendly two-component

polyurethane coatings. The coating film

made with the new Bayhydrol® U

dispersions display a wide spectrum of

properties, ranging from hard through to

flexible or even a pleasant velvety soft feel,

providing a tollbox for the formulation of

almost every specific coating. Final coating

from zero to low VOC content are possible,

depending of the choice of Bayhydur and

application requeriments.

BAYHYDROL® U: aqueous 

polyurethane polyol dispersions

Elastic and durable polyurethane 

dispersions for waterborne 2K PU systems

POLYISOCYANATES PREPOLYMERS DISPERSIONS UV SYSTEMS

BAYHYDROL® U
BAYHYDUR® Type Supply form NCO Content Viscosity Properties and Application

3100 HDI-based 100% 17.4 3,800 Versatile and economic.

304 HDI-based 100% 18.0 4,500 Versatile and economic, improved chemical resistance.

305 HDI-based 100% 16.2 6,900 Easy mixing and high gloss, specially suited for

trade application, also for mixing by hand.

XP 2487/1 HDI-based 100% 20.9 6,900 Very high chemical resistance.

XP 2547 HDI-based 100% 23.0 600 Water dispersible polyisocyanate, low viscosity, 

high chemical resistance.

XP 2655 HDI-based 100% 21.2 3,500 Very high chemical resistance, high gloss and easy 

incorporation.

XP 2700 HDI-based 65% 10.6 80 Bayhydur 305, diluted in DPGDME as “ready-to-use”

DPGDME supply form.

XP 2759 IPDI-based 70% 11.0 6,500 Fast drying and high chemical resistance.

MPA

The key to the waterborne 2-component

PU-systems for wood application is the use

of hydrophilic polyisocyanates, which have

to be completely homogenized into the

aqueous phase. In 1994 Bayer offered the

first of these products, under the

tradename Bayhydur®.

BAYHYDUR®: hydrophilic polyisocyanates for 2K waterborne polyurethane

systems

These surfactant-free hardeners are

specially designed for combination with our

Bayhydrol® types, and meet the most

important needs of today. By choosing the

right type of Bayhydur® it is possible to

adjust the performance of the coating

system according to the requirements.

Easy mixing and high performance: surfactant-free

hydrophylic polyisocyanates

woodsystems

[% on supply form] [mPa.s at 23°C]

BAYHYDUR® 
BAYHYDROL® UV Solid content Cosolvent MFFT Viscosity1 pH Properties and Application

[%] content [%] [°C] [s]

2282 39 0 0 <50 7.8 PU-dispersion, high chemical resistance, good grain wetting, 

physical drying for all-around use (multicoat).

2317 37 0 0 <80 7.8 PU-dispersion, high wet film transparency, good grain wetting, 

physical drying.

2280 39 0 25 <90 7.5 PU-dispersion, outstanding physical drying, good standard product for

pigmented coatings.

XP 2649 40 0 0 <50 8.0 PU-dispersion, especially for soft-touch coatings.

XP 2687 49 0 0 <500 mPa·s 8.0 PU-emulsion, good wood accentuation, high solids, good adhesion; 

especially as primer on wood.

2689/1 XP 42 0 0 <50 7.8 PU-dispersion, highest crosslink density, low physical drying; especially

for clear coats and deep matt coatings.

XP 2690 39 0 0 <80 8.2 PU-dispersion, weather-stable, tough; especially suited for wood 

exterior applications, very fast water release.

XP 2775 40 0 0 <150 mPa·s 8.0 PU-dispersion, excellent chemical and stain resistance, 

in pigmented white topcoats or matt clearcoats.

2792 XP 39 0 0 <100 mPa·s 3.5 Cationic PU-emulsion, excellent wood accentuation, good tannin 

blocking and adhesion, especially suitable as primer for wood.

11

The most promising technology within the

variety of environmentally friendly wood

coating systems are UV-curing PU

dispersions. UV waterborne technology is

the fastest curing waterbone coating

technology, has the highest crosslink

density, offers close to 0% VOC and

overspray recycling. These advantages

make this technology particularly suitable

for clear, pigmented, matt and effect

coatings.

BAYHYDROL® UV: radiation curing

resins

Waterborne radiation curing resins

1) Efflux time 4 mm cup, method AFAM 2008/1050

POLYISOCYANATES PREPOLYMERS DISPERSIONS UV SYSTEMS

BAYHYDROL® UV
A broad spectrum of polyisocyanates with

different structures and supply forms

enables you to select the combination of

your choice for each formulation in wood

and furniture coating. 

DESMODUR®: polyisocyanates 

for 2K polyurethane systems

Hardeners for high performance 2K 

polyurethane coatings

woodsystems

POLYISOCYANATES PROPERTIES

DESMODUR N L HL IL

Drying speed

Pot-life

Sandability 

Elasticity

Viscosity

DESMODUR N HL IL L

Yellowing

DESMODUR® Type Supply form Viscosity NCO content Properties and Application

L 75 TDI adduct 75% EA 1,600 13.3 Tough but flexible, all-purpose hardener for polyester and

L 67 BA 67% BA 600 11.9 fatty-acid modified polyester.

L 67 MPA/X 67% MPA/X 1,600 11.9

L 1470 TDI adduct 70% EA 1,900 9.7 Reactive hardener for polyester and fatty-acid modified polyester.

IL EA TDI isocyanurate 51% EA 700 8.0 Highly reactive hardener for polyester and fatty-acid modified

IL BA 51% BA 2,000 8.0 polyester.

IL 1351 TDI isocyanurate 51% BA 1,600 8.0 Highly reactive hardener for polyester and fatty-acid modified

polyester.

IL 1451 TDI isocyanurate 51% BA 250 7.4 Highly reactive low-viscosity hardener with good compatibility

for polyester and fatty-acid modified polyester.

HL BA TDI/HDI 60% BA 2,200 10.5 Reactive hardener with low yellowing for polyester and fatty-acid

HL EA isocyanurate 60% EA 1,100 10.5 modified polyester.

N 100 HDI biuret 100% 10,000 22.0 Highly flexible hardener with resistance to yellowing for 

N 75 BA 75% BA 160 16.5 polyacrylates.

N 75 MPA 75% MPA 250 16.5

N 75 MPA/X 75% MPA/X 250 16.5

N 3300 HDI isocyanurate 100% 3,000 21.8 Low viscosity, resistant to yellowing and chemicals.

N 3390 BA 90% BA 500 19.6

N 3600 HDI isocyanurate 100% 1,200 23.0 Low viscosity hardener for non-yellowing high solids and

waterborne coatings.

N 3790 BA HDI isocyanurate 90% BA 1,800 17.8 Highly functional hardener for fast-drying, chemical resistant

and non-yellowing coatings.

N 3900 HDI isocyanurate 100% 730 23.5 Low viscosity hardener for non-yellowing high solids and

waterborne coatings.

XP 2679 HDI allophanate 80% BA 500 15.4 Highly functional hardener for scratch-resistant and non-yellowing

trimer coatings. Specially recomended for self-healing coatings.

[mPa.s at 23°C] [% on supply form]

DESMODUR® 
Aromatic prepolymers for high performance systems 

with outstanding mechanical resistance

13

DESMODUR® E Type Supply form Viscosity NCO content Properties and Application

E 1160 TDI 60% MPA/X 550 5.4 For one-component moisture curing coatings. 

prepolymer Good resistance properties.

E 1361 MPA/X TDI 61% MPA/X 500 6.8 For one-component moisture curing coatings.

E 1361 BA prepolymer 61% BA 250 6.8 Good resistance properties and fast drying.

E 1660 TDI 60% BA 1,600 5.3 For one-component moisture curing coatings in combination with other

prepolymer Desmodur® E types. Good resistance properties and very fast drying.

E 1750 PR TDI 50% MPA/X 375 5.3 One-component moisture curing clear coat formulation for parquet.

prepolymer Good resistance properties and fast drying.

E XP 2605 TDI/MDI 50% BA 200 4.5 For one-component moisture curing clear coatings. Good resistance

prepolymer properties and very fast drying. For parket and furniture.

[mPa.s at 23°C] [%, on supply form]

One-component polyurethane coatings

based on Desmodur® E have, for many

years, set an industry standard. Desmodur®

E types are specially suitable for use in

formulating transparent wood coatings, e.g.

for parquet flooring and for wall and ceiling

panelling. Their outstanding resistance to

wear and non-slip characteristics mean that

they are the systems of choice for public

DESMODUR® E: 

moisture curing polyisocyanates 

for 1K and 2K polyurethane systems

buildings, dance halls and multi-purpose

halls. Such coatings withstand extreme

loads over long periods and thus provide

high cost-effectiveness. Coatings based on

Desmodur® E always dry in the presence of

moisture. Drying time, hardness

development and application properties are

depending strongly on the temperature and

humidity conditions in the atmosphere. To

take account of the wide variation in these

conditions, Bayer offers a range of adapted

products for use in every region of the

world and every application requirement.

✦ E 1160 ▲ E 1750 PR ❊ E 1361 ❋ E 1660/E 1361 (8:2)

10

8

6

4

2

0

TACK FREE IN HOURS

>8

3.5

2.2 0.5

50

40

30

20

10

0

ABRASION IN mg*

18 16 16

21

0d 1d 3d 5d 7d 8d

180

160

140

120

100

80

60

40

20

0

TIME / DAYS

PENDULUM HARDNESS

✦

❊

❋

❋

❊ ❊❋ ❊❋

▲

▲ ▲ ▲

✦

✦ ✦

POLYISOCYANATES PREPOLYMERS DISPERSIONS UV SYSTEMS

DESMODUR® E
Very high solid Conventional medium solid

1 X 80 g/m2 coat 2 X 40 g/m2 coat

Cost of raw materials higher lower

Application cost lower higher

Productivity higher lower

Overall cost lower higher

The European VOC legislation is leading to

an increased demand for coatings with

reduced content of organic solvents. Very

High Solids (VHS) coatings offer a variety

of possible application fields with still

optimal durability, optical and mechanical

properties as well as application

robustness. Our Desmophen® polyaspartatic

ester range offer the possibility to

formulate 2K PUR systems with very high

solids content and very fast drying. The use

of low viscosity HDI isocyanurates as

Desmodur® N 3390 or Desmodur® N 3900

is highly recommended as partners to

produce very high solid 2K-PUR coatings.

DESMOPHEN NH®: polyaspartatic 

esters for very high solids coatings

woodsystems

DESMOPHEN® Type Supply form Viscosity Properties and Application

NH 1420 Aminofunctional reactive thinner 100% 1450 Very high solid 2K-PUR and solvent-free coatings.

NH 1520 Aminofunctional reactive thinner 100% 1400 Very high solid 2K-PUR and solvent-free coatings.

NH 1521 Aminofunctional reactive thinner 90% BA 160 Very high solid 2K-PUR and solvent-free coatings.

DESMODUR® Type Supply form Viscosity NCO content Properties and Application

N 3390 HDI isocyanurate 90% BA 500 19.6 Low viscosity, resistant to yellowing and chemicals.

N 3900 HDI isocyanurate 100% 730 23.5 Low viscosity, resistant to yellowing and chemicals.

[mPa.s at 23°C]

[mPa.s at 23°C] [%, on supply form]

Polyaspartic esters for high solid coatings DESMOPHEN NH with very high reactivity ® 
15

Due to their enormous versatility raw

materials for polyurethane coatings have

gained highest shares in world ́s markets

for wood and furniture coatings. The

tremendous variability in resins structure

leads to a high versatility in properties. The

many requirements resulting from specific

demands of different kinds of wooden

substrates can be satisfied by using

tailormade PU-coatings.

DESMOPHEN®: polyols for 2K 

polyurethane coatings

DESMOPHEN® Type Supply form Viscosity OH content Properties and Application

651 MPA/X Branched polyester 67% MPA/X 25,000 5.5 For colourfast and chemically resistant 

651 MPA 65% MPA 14,500 5.5 coatings and isolation primers on exotic wood.

800 Branched polyester 100% 850 (70% in MPA) 8.6 High chemical resistance, impact resistance

800 BA 85% BA 11,000 7.3 toughness and abrasion resistance.

800 MPA 85% MPA 11,000 7.5

1100 Branched polyester 100% 400 (70% in MPA) 6.5 Highly flexible, good compatibility with other

Desmophen grades.

1200 Slightly branched 100% 300 (70% in MPA) 5.0 Highly flexible, good compatibility with other

polyester Desmophen grades.

1700 Linear polyester 100% 17,500 1.3 Flexibilising resin to improve toughness,

durability and abrasion resistance in coatings.

1300 X Fatty-acid-modified 75% X 3,450 3.2 For clear and pigmented primers, fillers and topcoats.

1300 BA branched polyester 75% BA 1,000 3.2

1300 PR 75% X 7,250 3.1

1400 PR Fatty-acid-modified 75% MIBK 13,000 3.2 Highly reactive, high surface hardness, easy to matting.

branched polyester

PL 300 Fatty-acid-modified 60% X 5,350 2.7 Hard, highly reactive and long pot-life.

branched polyester

PL 800 Fatty-acid-modified 70% X 1,500 2.5 Good pigment wetting, flexible, high yellowing resistance,

branched polyester low application viscosity.

PL 817 Fatty-acid-modified 75% X/MEK 10,000 3.3 Highly reactive. In combination with highly condensed types

branched polyester in sealers to increase solid content.

RD 181 PR Fatty-acid-modified 75% X 12,500 3,6 Good pigment wetting, low yellowing, for clear and pigmented

branched polyester glossy coatings.

[mPa.s at 23°C] [%, on supply form]

Polyester polyols for 2K

solventborne polyurethane coatings

POLYISOCYANATES PREPOLYMERS DISPERSIONS UV SYSTEMS

DESMOPHEN® 

Acrylyc polyols for polyurethane coatings for wood and furnitrue application are supplied under Desmophen A and Desmophen A HS tradenames by Viverso. 

Technical information is available in www.viverso.com.
URETHANE ACRYLATES

ESTER ACRYLATE

AMINE-MODIFIED POLYETHER ACRYLATE

UNSATURATED POLYESTERS 

IN ACRYLATE MONOMERS

ACRYLATES FOR DUAL CURE

Unsaturated Acrylates

Unsaturated acrylate coating systems for

radiation curing have wide ranging

potential applications. They combine

environmental compatibility with high

quality and utmost efficiency. 

Most versatile are urethane acrylates. Bayer

MaterialScience offers a broad product

range of urethane acrylates based on the

Desmodur® series, which varies from

highest elasticity to high hardness. Using

these products, properties like abrasion-,

scratch- and impact-resistance are

adjustable.

A keypoint for successful formulations is

the use of low viscosity Desmolux types. 

These products enable users to maintain

the resins performance properties in the

final coating, e.g. abrasion resistance:

Urethane acrylates with residual NCOgroups are designed for dual-cure

formulations. Dual-cure formulations

crosslink by radical photopolymerisation

and an additional reaction of isocyanate

groups. These dual functional products

exploit the key advantages of radiation

curing and 2K PU-technology. Good

adhesion can be achieved even on oily and

inhibiting wooden surfaces. Additionally

post-cure effects in shadow areas and

improved chemical and mechanical

properties are possible.

Unsaturated Acrylates 

for Dual cure

Unsatured acrylates and polyester

woodsystems

➜

The combination of low-viscosity PES and

PET acrylates provides a maximum

reactivity and enables users to avoid

monomers. The products are designed for

fast moving units for wood panels.

Polyesther / Polyether

acrylates

➜

Unsaturated polyester resins (UP) in

combination with acrylic reactive thinners

result in positive synergism. 

The excellent performance characteristics of

UPs such as sandability, matting effects etc.

are achieved with much higher reactivity.

Unsaturated Polyesters in

acrylate monomers

➜

75 60 50 40

5,000

4,500

4,000

3,500

3,000

2,500

2,000

INFLUENCE OF THE QUANTITY OF REACTIVE THINNER ON ABRASION RESISTANCE

BASE RESIN IN %

CYCLES/100 mm. 

grit-feeder 

(500 g/abrasive wheel)

■

■

■

■

URETHANE ACRYLATE/HDDA

2,600

3,100

3,600

4,900

DESMOLUX® 
DESMOLUX Type Supply form Viscosity Properties and Application

[mPa.s at 23°C]

U 100 Tough but flexible, aliphatic urethane acrylate 100% 7,500 High abrasion resistance, especially for parquet. 

U 200 Tough but flexible, aliphatic urethane acrylate 100% 8,000 Very high abrasion resistance in many test methods,

especially for parquet.

U 400 Hard, aliphatic urethane acrylate 60% in PTTA 90,000 High scratch resistance and good chemical and mechanical

resistances.

U 500 Tough but flexible, aromatic urethane acrylate 100% 6,000 High abrasion resistance, especially for parquet and cork.

U 680 H Hard, aliphatic urethane acrylate 80% in HDDA 29,000 Highly resistant films, especially for outdoor applications.

VP LS 2220 Tough but flexible, aliphatic urethane acrylate 75% in TPGDA 26,000 High abrasion resistance, especially for parquet.

VP LS 2265 Hard, aliphatic urethane acrylate 100% 800 High abrasion resistance, combination product for

Desmolux U 100 or Desmolux U 200.

XP 2491 Highly flexible, aliphatic urethane acrylate 80% in IBOMA 90,000 Extremely flexible, elongation at break > 250%,

with hard resins.

XP 2513 Tough but flexible, aliphatic urethane acrylate 100% 25,000 Highly flexible, improves elasticy in combination

with hard resins.

XP 2587 Hard, aliphatic urethane acrylate, 100% 1,500 Easily emulsified in water. Hard films with good sandability

water emulsifiable. and brilliance. Good mechanical and 

chemical resistances. Improved adhesion to wood.

XP 2733 Tough but flexible polyesteracrylate 100% 18,000 High reactivity, high crosslink density, for fast running 

roller coating application.

XP 2744 Tough but flexible polyesteracrylate 100% 6,500 Low viscosity, good balance between hardness and flexibility

VP LS 2266 Tough but flexible, ester-epoxy acrylate hybrid 100% 8,000 High reactivity.

VP LS 2299 Medium-hard, amine modified polyether acrylate 100% 600 High reactivity, for low viscosity coatings.

P 175 D Hard, gloss polyester 75% in DPGDA 17,000 Clear and pigmented primers and topcoats; very high

reactivity, good sandability, adhesion and intercoat

adhesion, improves scratch resistance of UV topcoats.

VP LS 2381 Hard, unsaturated polyester 70% in DPGDA 12,000 For clear and pigmented primers and topcoats; very high

reactivity, good adhesion and sandability.

XP 2490 Tough, gloss polyester 76% in DPGDA 13,000 Clear and pigmented primers and topcoats; high gloss and

especially matt coatings, excellent sandability.

XP 2681 Tough, gloss polyester 85% in HEMA 37,000 For conventionell and UV curing systems.

D 100 Flexible, aliphatic urethane acrylate 100% 10,000 NCO content: 12.5%, for dual-cure technology; improves

adhesion, coin test.

XP LS 2396 Flexible, aliphatic urethane acrylate 100% 16,000 NCO content: 7.5%, for dual-cure technology; improves 

adhesion, coin test and flexibility.

XP 2510 Hard, aliphatic urethane acrylate 90% in BA 20,000 NCO content: 6.7%, for dual-cure technology; improves 

adhesion, coin test, high UV reactivity.

POLYISOCYANATES PREPOLYMERS DISPERSIONS UV SYSTEMS 17
General

• HDI: Hexamethylene diisocyanate

• MDI: Diphenylmethane 

diisocyanate

• MFFT: Minimum film formation

temperature

• PAC: Polyacrylate

• PU: Polyurethane

• PUD: Polyurethane dispersion

• TDI: Toluene diisocyanate

• UA: Unsaturated acrylate

• UP: Unsaturated polyester

Solvents

• BA: Butyl acetate

• BG: Butyl glycol

• DPGDME: Dipropylene glycol 

dimethyl ether

• EA: Ethyl acetate

• MEK: Methyl ethyl ketone

• MIBK: Methyl isobutyl ketone

• MPA: 1-Methoxypropyl acetate-2

• NMP: n-Methyl pyrrolidone

• PnB: Dowanol PnB

• SN100: Solvent naphtha 100

• X: Xylene

Acrylate monomers

• DPGDA: Dipropylene glycol

diacrylate

• HDDA: Hexanediol diacrylate

• IBOMA: Isobornyl methacrylate 

• PTTA: Pentaerythrol tetraacrylate

• TPGDA: Tripropylene glycol 

diacrylate

KEY TO THE ABBREVIATIONS USED IN THE TABLES:

BD Dispersions Wood Coatings

Barcelona (Spain)
Headquarter Bayer AG in Leverkusen (Germany)
POLYISOCYANATES PREPOLYMERS DISPERSIONS UV SYSTEMS
This information and our technical advice - whether verbal, in writing or by way of trials - are given in good

faith but without warranty, and this also applies where proprietary rights of third parties are involved. Ou

advice does not release you from the obligation to verify the information currently provided –especially

that contained in our safety data and technical information sheets– and to test our products as to thei

suitability for the intended processes and uses. The application, use and processing of our products and

the products manufactured by you on the basis of our technical advice are beyond our control and, the

refore, entirely your own responsibility. Our products are sold in accordance with our General Conditions

of Sale and Delivery.

The technical data given to each product are not to be regarded as specifications.

Edition: March 2011