BAYPREN® ADHESIVESPRODUCT PORTFOLIO
Nowhere visible but everywhere present in e­ veryday life:
contact adhesives based on Baypren® from ­ARLANXEO
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BAYPREN®
POLYCHLOROPRENE FOR CONTACT ADHESIVES
Baypren® – Polychloroprene for contact adhesives

Following momentary strength, crystallization of the poly­chloroprene further increases cohesion, resulting in a f­inalbond strength, that exceeds the adhesion strength achiev­
able with contact adhesives based on ­natural or ­nitrile­rubber by far.
Apart from their simple, economical processing, contact
adhesives based on Baypren® are distinguished by their­excellent adhesion to a wide range of materials. Additionally they allow formation of soft bond lines for the joining offlexible substrates like rubber, foamed material or leather.

Supply form of Baypren® adhesive grades: chips

Initial strength as a function of open timeand applied pressure during bonding

Peel strength

ARLANXEO’s polychloroprene is a polymer made from themonomer 2-chloro-1,3-butadiene. It is produced by stateof-the-art processes with over 60 years of e­ xperience. Goodresistance against ozone and oxidative stress, ­excellent­solubility in many organic solvents and solvent mixtures, aswell as a high rate of crystallization make it ideal for theproduction of solvent based contact adhesives. Contact­bonding requires the application of the adhesive on bothsubstrates. After brief surface drying the substrates arejoined with pressure w­ ithin the open time (contact bondingtime) of the adhesive. One of the most prominent f­ eatures ofadhesives based on ­Baypren® is the high initial strength thatis ­established instantly with joining. The bonded ­substrates
can be h­ andled immediately, fixation of the substrates until
the cure is finalized is not needed. The initial strength aswell as the open time can be influenced by the pressureduring bonding. The higher the pressure, the higher is theinitial strength and the longer is the contact bonding time(see chart).

Open time with low pressure
Open time with higher pressure

Main application industries
The demand for contact adhesives based on Baypren®
is particularly high in the shoe industry, in fabrication of­mattresses, in furniture production, in the construction andautomotive industry and in the do-it-yourself sector.
Footwear sector – one of the industries
where contact adhesives are indispensable

TimeBAYPREN®
SELECTION OF GRADES
Choice of crystallization rate and solution viscosity
The B­ aypren® portfolio for adhesive applications consistsof two product lines, differing in their rate of crystallization.
Crystallization of polychloroprene can be followed by measuring the Shore A hardness increase at -10 °C over time. As
shown in the chart below, the 300 grades are crystallizing
more readily and are reaching a higher final degree of crystallization than the 200 grades. Within both product lines
different grades with varied viscosities (chain lengths) areavailable, to allow the choice of the best suiting raw material
for the distinct a­ pplication.
Fast crystallizing 300 grades
The fast crystallizing 300 grades are giving contact adhe­sives with high initial strength, high final strength and ­rapidbond formation. These adhesives are specially useful in­industries with fast production cycles like the shoe i­ndustry.
Due to the high initial strength, production processes­following the bonding step can be done at once. The joined
substrates can be handled immediately, without waiting forthe final setting of the adhesive.
­ aypren® can be dissolved directly, without a previous millBing step. Most of the grades are delivered in approx. 2 mmchip thickness allowing a fast solvation of the polymer.
­Polymers with long chain length generally need a longer­solvation time. To offset the longer solvation times the highviscosity grades B­ aypren® 340-2 to 350-2 are produced in
1 mm chip thickness.
Crystallization of the Baypren® adhesive grades at -10 °C

If the final application is challenging regarding flow properties of the adhesive, milling of the chips is helpful to reduce
viscosity and normal stress of the adhesive formulation.
Within the ­Baypren® portfolio for adhesive applications, thethiuram modified grade ­Baypren® 321-1 is specially suit­able
for milling and the preparation of smooth, easy-to-apply­adhesives. Under unfavorable conditions, e.g. in the presence of certain leather greases or in contact with iron, thisgrade bears the risk of pro­ducing a yellowish discoloration­When bonding sensitive, light-colored materials, it is advisable to use the ­thiuram-free B­ aypren® grades.
Medium fast crystallizing 200 grades
In cases where high initial bond strength is not n­ eeded(e. g. flooring or roofing) the medium fast crystallizing­Baypren® grades of the 200 range can be used. They
­prolong the open time of the adhesives, enhancing processing reliability and give a softer, more flexible bond line.
The medium fast crystallizing Baypren® grades can be usedboth on their own or in combination with fast crystallizing­Baypren® grades. Additionally the blending of grades of­different viscosities is without problem, allowing the formulation of an adhesive with well-fitting viscosity and crystallization for the distinct application.

Solvation time of Baypren® 300 grades in toluene(5 wt.-% solutions)

100

120
100
Solvation time [min]Hardness [Shore A]

9080
7060
50

60
40
2040
300.1

80

01

10

100

1,000

310

320

330

300 grades

200 grades

340

350

Baypren® grades

Time [h]2 mm Chips

1 mm Chips

BAYPREN®
ADHESIVES FORMULATION
Choice of solvent­ aypren® adhesive raw materials are soluble in many oB­ rganic
solvents and solvent mixtures. The solvent or ­solvent mixture used to produce the adhesive can have a considerable
influence on:
the viscosity of the adhesive
the compatibility of the adhesive with an added ­crosslinking agent
the behavior of the adhesive during storage at
low temperatures
the appearance of phase separation during
the storage of resin-containing adhesives
the wetting of the substrate surface
the drying of the adhesive film
the open time of the adhesive film
the curing rate of the bondPerfectly suited, efficient, economical – Baypren® ­adhesives,on which ­industries such as furniture production rely on

Apart from the influence on the technical properties of theadhesives, the physiological effect of the solvents also has
to be considered. The use of certain solvents is subjected
to restrictions or is completely banned in some countries.
Furthermore, attention must be paid to the flammability ofmany solvents and their ability to form explosive mixtureswith air.

Modification of the adhesive formulation
Addition of zinc oxide and magnesium oxide to the adhesive
formulation is advisable as these metal oxides are acting asacid scavengers and are increasing the bond strength. Incombination with an alkyl phenolic resin magnesium o­ xide
is additionally enhancing the temperature resistance ofthe bond. Resins in general are added to increase contact
bonding time and tack.

by addition of Levamelt® (ethylene vinyl acetate copolymers
with 40 – 90 wt % vinyl acetate content) to the adhesive
formulation.

If formulated well, adhesives based on B
­ aypren® can beused in combination with isocyanates in two part adhesives,
giving adhesives with higher cohesion, heat stability and­adhesion to difficult-to-bond substrates.
Grades from the 300 product line are additional suitable forgrafting with methyl methacrylate (MMA). By grafting withMMA, the adhesion to plasticized polyvinylchloride (PVC)
is enhanced. If the grafting reaction is not possible, the­adhesion to plasticized PVC can significantly be improved

High performance adhesives based on Baypren®

BAYPREN®
RANGE OF GRADES
Fast crystallizing Baypren® adhesive
ALX grades
gradesFast crystallizing
Nomenclatureof Baypren
Baypren®® grades
ALX grades

GradeFirst digit: Indication of the crystallization rate

Chipthickness[mm]Viscosity [mPa·s]
10 wt.-%
solution in toluene

Baypren® 310-1

approx. 2150

Baypren® 320-1

approx. 2450

Baypren® 320-2approx. 2

Baypren® 330-1

approx. 2850

Baypren® 330-2approx. 2

1,150

Baypren® 340-2

approx. 1

2,100

1= thiuram modified grade
Fourth digit: Viscosity (subcategory)

Baypren® 350-1

approx. 1

2,800

1

= lower viscosity range

Baypren® 350-2

approx. 1

3,900

2

= higher viscosity range

Standard grades

2= medium3= fastSecond digit: Indication of the viscosity
1= low2+3= medium

4= high5= very highThird digit: Indication of special properties
0+3= standard grades

Thiuram modified grade
Baypren® 321-1

approx. 2450

Medium fast crystallizing Baypren® adhesive grades

GradeChip-­thickness[mm]

Viscosity [mPa·s]
10 wt.-% ­solution in toluene

Baypren® 213-1

up to 10150

Baypren® 213-2

approx. 2300

Baypren® 223-2

approx. 2680

Baypren® 233-1

approx. 2850

Baypren® 233-2

approx. 2

1,150

Baypren® 243-2

approx. 2

2,100

Baypren® 253-1

approx. 2

2,800

Baypren® 253-2

approx. 23,900

Supply form
To ensure consistent pourability, the flat, beige Baypren®
chips are talc coated. The material is filled in 25 kg multilayered paper bags, inside PE-coated and delivered on awooden pallet containing 40 bags (net weight per pallet
1000 kg), covered by a PE stretching or shrinking film.
Thickness of Baypren® chips (approximate)Standard grades

up to 10 mm:
Baypren®
213-1

2 mm:
Baypren®
213-2 to 253-2
Baypren®
310-1 to 330-2

Your contact to Baypren® experts
www.arlanxeo.com/en/contact-us

1 mm:
Baypren®
340-2 to 350-2

Trial product:(VP = Versuchsprodukt = trial product). The information contained herein is merelypreliminary. Testing as to properties and applications is not final. Further information,including data which could change or add hazards with use, may be developed by
the manufacturer, the user or a third-party institute. Such information may be needed
to properly evaluate or use this product. Use is undertaken at the sole risk of the user.
Quality & Environmental Management:
Baypren® is produced under strict control regarding safety, environmental protection
and quality. The whole supply chain, from production to customer service, is coveredby ISO 9001 and ISO 14001 certification.
Product Safety:
Relevant safety data and references as well as the possibly necessary hazard warning labels can be found in the Material Safety Data Sheets.
Health and Safety Information:
Appropriate literature has been assembled which provides information concerning thehealth and safety precautions that must be observed when handling the ARLANXEO
products mentioned in this publication. For materials mentioned which are not
ARLANXEO products, appropriate industrial hygiene and other safety precautions
recommended by their manufacturers should be followed. Before working with any ofthese products, you must read and become familiar with the available information on
their hazards, proper use and handling. This cannot be overemphasized. Information
is available in several forms, e.g., material safety data sheets and product labels.
Consult us through your ARLANXEO representative.

Portfolio/Edition 2021
© 2021 ARLANXEO. All rights reserved.

ARLANXEO Holding B.V.
Scheveningseweg 642517 KX, The Hague
The Netherlands
www.arlanxeo.com/en/contact-us

Regulatory Compliance Information:
Some of the end uses of the products described in this publication must comply withapplicable regulations, such as the FDA, BfR, NSF, USDA and CPSC. If you haveany questions on the regulatory status of these products, contact your ARLANXEO
representative.
The manner in which you use and the purpose to which you put and utilize ourproducts, technical assistance and information (whether verbal, written or by wayof production evaluations), including any suggested formulations and recommendations, are beyond our control.
Therefore, it is imperative that you test our products, technical assistance and­information to determine to your own satisfaction whether they are suitable for yourintended uses and applications. This application-specific analysis must at least­include testing to determine suitability from a technical as well as health, safety, andenvironmental standpoint. Such testing has not necessarily been done by us. Unless
we otherwise agree in writing, all products are sold strictly pursuant to the terms of
our standard conditions of sale, which can be found at the ARLANXEO homepage.
All information and technical assistance is given without warranty or guarantee andis subject to change without notice. It is expressly understood and agreed that you
assume and hereby expressly release us from all liability, in tort, contract or otherwise, incurred in connection with the use of our products, technical assistance andinformation.
Any statement or recommendation not contained herein is unauthorized and shallnot bind us. Nothing herein shall be construed as a recommendation to use any product in conflict with patents covering any material or its use. No license is implied orin fact granted under the claims of any intellectual property right.
Baypren® is a Registered Trademark of ARLANXEO Deutschland GmbH