Mineral oil adhesives in metallocene polyolefin hot melts

During the past few years, metallocene polyolefin elastomers (mPO) have
become significant market players and are growing continuously in several
industrial segments.

Ingredients Description F1 F2 F3
Polymer Olefin block copolymer 20 20 20
Resin Aliphatic hydrocarbon resin 60 55 50
Mineral oil Naphthenic  15 20 25
Wax PR homopolymer 5 5 5

During the past few years, metallocene polyolefin elastomers (mPO) have become significant market players and are growing continuously in several industrial segments. Strong penetration can be observed in hot melt adhesives (HMA) where the dominant polymer is still styrene block copolymer (SBC). Due to the unique properties, versatile applicability and supply benefits polyolefin based alternatives are becoming increasingly favourable and have also started to replace SBCs in certain HMA applications. The estimated global demand for SBCs and polyolefins are expected to be equal by 2020.

Mineral oil is used as plasticiser in a variety of hot melt applications (e.g. tapes, labels, flooring, hygiene articles etc). The function of the plasticiser is to lower the melt viscosity, to adjust glass transition temperature and the end-use properties. Similarly to SBCs, mPOs are also high molecular weight compounds that require plasticiser to meet certain property requirements. Hence, it is of great importance to assess the compatibility and impact of mineral oils on the performance of mPO-based HMAs.

The current study aims to investigate the effect of different mineral oils on typical adhesive properties i.e. peel adhesion, shear performance, viscoelasticity, oil extendibility in mPO-based HMA formulations. Three polymers were tested an olefin block copolymer (OBC), an ethylene-octene copolymer (EO) and a polyprolylene-based (PP) elastomer. In order to monitor the impact of different mineral oils naphthenic and paraffinic grades were compared.

Since one of the biggest outlets for these adhesives is the hygiene industry – more specifically non-woven applications i.e. diapers and feminine care – the formulations were based on general construction adhesive recipes.

In order to limit the effect of different components, the formulations were kept simple and containing only the most essential ingredients (Table 1.) All samples were spray coated on PE non-woven substrates and the spray pattern was optimized. In order to evaluate the weight reduction possibility of the adhesive three different add-on levels were used; 2, 3 and 4 grams.

Ingredients Description F1 F2 F3 F4
Polymer

Ethylene-octene copolymer
Polypropylene elastomer

20
20


20

 

 
20

 
20

Resin Hyrdogenated hydrocarbon resin 59.5 59.5 59.5 59.5

Mineral oil

Naphthenic
Paraffinic


20

 

 
20


20

 

 
20

Stabilizer Hindered phenol 0.5 0.5 0.5 0.5

Table 1: Formulation of EO and PP based HMA

Performance comparison of naphthenic and paraffinic plasticisers in PE and PP based formulations

Figure 1 presents the melt viscosity results of both EO and PP based construction formulation. The measurements were carried out at 165°C. In EO based formulation no difference was observed between naphthenic and paraffinic plasticisers. In case of PP based samples naphthenics showed slightly higher viscosity. This is due to the higher polarity of naphthenic molecules. Another oil property that influences the melt viscosity is the viscosity index (VI) which is the measure of viscosity drop as a function of temperature. Typically naphthenic molecules have lower VI value compared to paraffinics. This means that the viscosity drop is bigger for naphthenics when the temperature is increased. Therefore, in the current case it means that if the temperature would be increased up to 180°C, the viscosity of both naphthenic and paraffinic would be equal or slightly lower for naphthenics. Melt viscosity is especially important for the application of the adhesive layer on the substrate. Choosing a mineral oil with a low VI (high viscosity drop) would ensure that the application temperature could be decreased. This has an impact on the manufacturing and processing efficiency as it would mean lower energy consumption due to the lower temperature.

Figure 1: Melt viscosity comparison of EO and PP based HMA formulations containing naphthenic and paraffinic oil

Performance has special importance within the service temperature range in case of diaper or other non-woven adhesives that come in contact with human body or used at elevated temperatures. Typically the peel properties such as peel strength decreases with the increasing temperature. On Figure 2 the peel strength values at 37°C are presented for both EO and PP based samples including the different add-on levels. It is clearly visible that in both polymers containing naphthenic oil the peel values are significantly higher at high add-on levels compared to paraffinics. By decreasing the weight of the adhesive on the substrate there is a trend of decreasing peel strength. This is expected as the adhesive layer between the substrates is getting thinner. If we compare the peel values of naphthenic and paraffinic formulations as a function of decreasing adhesive add-on levels it seems that the difference between the two types of mineral oil plasticisers is reduced. However, even at the lowest add-on level (2 grams) naphthenic plasticisers ensure significantly higher peel performance.

Figure 2: Peel strength of EO and PP based HMA in case of decreasing add on levels

The shear performance plays higher role in case of tapes and labels, but it is certainly important for non-woven adhesives as well. In case of PP based formulations no difference was observed between naphthenic and paraffinic grades, which was expected (Figure 3). This property is mainly polymer and tackyfier dependent. Nevertheless, it seems that naphthenic oils can contribute to the shear performance in EO adhesives. It resulted in significantly higher SAFT value compared to the paraffinic sample.

Figure 3: Comparison of shear adhesion failure temperature of EO and PP based HMA

The viscoelastic behaviour and the rheology of the adhesive basically define the overall performance, manufacturing and processing conditions. Therefore, in-depth analysis of rheology curves can be a great tool in rapid formulation development and adjustment. Many different properties can be predicted from the rheology data (e.g. peel strength, creep, open time, viscosity, glass transition etc.).

By comparing the rheology curves of formulations containing naphthenic and paraffinic plasticisers significant differences were observed (Figure 4-5). Naphthenic oils contribute to higher storage and loss modulus, therefore higher peel values could be expected. This correlates well with the peel adhesion results. There is another significant difference in the tanδ peak compared to paraffinic formulations. The glass transition temperature (Tg) is shifted by approximately 5-10°C. This is due to the difference between naphthenic and paraffinic oils. Paraffinics have typically 5-10°C lower Tg which is the reason for such difference. Having a naphthenic could be beneficial, because due to the higher Tg more oil could be added to the formulation and along that the resin content could be reduced as well. This will result in a lower formulation cost of the adhesive.

Figure 4: Rheology of EO based HMA containing naphthenic and paraffinic oil

Figure 5: Rheology of PP based HMA containing naphthenic and paraffinic oil

In addition to the Tg, the characteristics of the tanδ curve could also indicate other properties. The higher the tanδ at the Tg, the better the flow and wet out of the adhesive. This has a direct impact on the processing and application of the hot melt. It is typically higher with naphthenics and was observed to be in both EO and PP formulations. In case of PP samples the difference in the characteristic of the tan curve between naphthenic and paraffinic oils is more pronounced. The shape of the Tg peak corresponds to compatibility. Based on this naphthenic and paraffinic oils is expected to have similar compatibility with EO, however Tg peak is much narrower and sharper for naphthenics in PP, therefore it indicates higher degree of compatibility.

In other predicted properties no significant difference was observed. The creep resistance, open time and melting temperature is expected to be similar regardless the grade of the mineral oil.

Effect of oil loading on OBC based hot melt adhesives

Oil content has high importance in hot melt formulation as it impacts the properties and the cost of the final product. Therefore, in order to investigate how different oil levels contribute to the performance of HMA, general non-woven formulations with increasing oil and add-on levels were prepared (Table 2) and the performance of each formulation was evaluated.

Ingredients Description F1 F2 F3
Polymer Olefin block copolymer 20 20 20
Resin Aliphatic hydrocarbon 60 55 50
Mineral oil Naphthenic 15 20 25
Wax PE homopolymer 5 5 5

Table 2: Formulation of OBC based HMA

The melt viscosity of each formulation was measured at different temperatures. It was expected that with the increasing oil content the viscosity would decrease as the plasticising effect is more pronounced (Fig. 6). At 140°C there was a slight difference between the viscosity of samples with 15% and 20% oil content. By increasing the temperature the difference seemed to slightly increase as well but still the viscosity of these two formulations were quite similar at certain temperatures. Increased plasticising effect was observed only at the highest oil loading (25%). In this case the viscosity at 140°C was half of the other two samples and has not changed much by increasing the temperature up to 160°C. This indicates that higher oil content could have a significant impact on processing of the hot melt. It is possible to lower the application temperature in combination with higher oil content. This has an impact on energy efficiency of the processing.

Figure 6: Melt viscosity of OBC based HMA as a function of temperature and oil content

In general by increasing the plasticising effect it is expected to have a negative impact on peel properties. Figure 7 shows the peel strength of the adhesives at 37°C as a function of oil content. At add-on levels of 4 and 3 grams the peel strength shows decreasing tendency as a function of decreasing add-on level. In case of 15% oil content the peel strength could not be measure due to a substrate failure. This indicates that the peel strength of this sample is higher than the others. At 2 grams of add-on level it seems that the oil level has minor influence on the peel values. Regardless the oil amount the peel strength was around 50 g/25mm. This means that at low adhesive add-on levels a hot melt with higher oil content would perform still as good as a formulation with lower oil content. Similar conclusions were drawn from the shear adhesion failure temperature results as well. Even though it is mainly dependent on the polymer and resin some difference is expected in the SAFT value. This was not the case in this study as the oil content did not have any influence on the SAFT at all.

Figure 7: Peel adhesion of OBC based HMA as a function of oil content

The effect of the oil content on the rheology was predictable an in-line with the plasticising theories. Typically with the increase of plasticiser the material becomes softer therefore the storage and loss modulus decreases (Figure 8). With the higher oil content the Tg decreases. If the aim is resin replacement and the Tg is a key factor the resin selection plays a vital role. The Tg could be kept constant with an increasing oil content if the tackyfier resin is exchanged to another one with a higher Tg. The tanδ curves also show that the increasing oil content has no influence on compatibility and wet out behaviour, hence the melting point and open time decreased somewhat with the higher oil content.

Conclusions

The study shows that naphthenic oils are highly compatible with mPO based hot melt adhesives. The performance of naphthenic oils in both EO and PP formulations is better than paraffinics. Mineral oils have minimal impact on the shear adhesion failure temperature and this property is mainly governed by the type of polymer and tackyfier resin. On the rheology curves higher modulus was observed for formulations with naphthenic oils, which is inline with the peel adhesion results. In addition, higher wet out and better compatibility was also observed with naphthenic plasticisers. It was shown that the increasing oil content has no effect on the peel adhesion at low add-on levels and has positive impact on the processing properties (e.g. application temperature). Therefore, it is possible to increase the oil content up 20-25% and at the same time decrease the amount of tackifyer resin. This would result cost reduction during processing and on the formulation as well.

Further reading

Sealing deal for Sealants

Producers of silicone sealants need look no further. Nynas has developed a range of specially designed silicone fluid alternatives that are cost-efficient and offer the right balance in formulations between viscosity, colour stability and volatility.

Solvency offers great solutions

High solvent power is the secret of the success of naphthenic oils in chemical applications. Anna Eriksson, Technical Manager, Nynas Naphthenics, offers a couple of examples that explain why.

Hot solution for hot melts

By boosting the compatibility of ingredients, naphthenic mineral oils are providing hot melt adhesive manufacturers with new and more flexible formulations

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Sales Executive

 Ingrid Geldhof

Ingrid Geldhof

Customer Service Executive

 Femke Goeminne

Femke Goeminne

Customer Service Executive

 Jason Wong

Jason Wong

APAC Regional Director

 Rio Nasution

Rio Nasution

General Manager / Sales Manager

Lawrence Teo

Lawrence Teo

Area Sales Manager Malaysia, Sri Lanka and Bangladesh

 Georgina Ng

Georgina Ng

Customer Service Executive

 Dawn Tay

Dawn Tay

Customer Service Executive

Marco Roncelli

Marco Roncelli

Sales Executive

 Ilenia Bellotti

Ilenia Bellotti

Customer Service Executive

Daniele Frustagli

General Manager

David Barnett

David Barnett

Sales Manager

 Melissa Hill

Melissa Hill

Sales Representative

 Samantha Moodley

Samantha Moodley

Customer Service Executive

Lee Anne Williams

Lee Anne Williams

Customer Service Coordinator

David Barnett

David Barnett

Sales Manager

 Melissa Hill

Melissa Hill

Sales Representative

 Samantha Moodley

Samantha Moodley

Customer Service Executive

Lee Anne Williams

Lee Anne Williams

Customer Service Coordinator

 Jason Wong

Jason Wong

APAC Regional Director

 Rio Nasution

Rio Nasution

General Manager / Sales Manager

Lawrence Teo

Lawrence Teo

Area Sales Manager Malaysia, Sri Lanka and Bangladesh

 Georgina Ng

Georgina Ng

Customer Service Executive

 Dawn Tay

Dawn Tay

Customer Service Executive

David Barnett

David Barnett

Sales Manager

 Melissa Hill

Melissa Hill

Sales Representative

 Samantha Moodley

Samantha Moodley

Customer Service Executive

Lee Anne Williams

Lee Anne Williams

Customer Service Coordinator

Marco Roncelli

Marco Roncelli

Sales Executive

 Ilenia Bellotti

Ilenia Bellotti

Customer Service Executive

Daniele Frustagli

General Manager

David Barnett

David Barnett

Sales Manager

 Melissa Hill

Melissa Hill

Sales Representative

 Samantha Moodley

Samantha Moodley

Customer Service Executive

Lee Anne Williams

Lee Anne Williams

Customer Service Coordinator

Marco Roncelli

Marco Roncelli

Sales Executive

 Ilenia Bellotti

Ilenia Bellotti

Customer Service Executive

Daniele Frustagli

General Manager

Eric Alfosea

Eric Alfosea

Sales Manager France

 Meriam Gourine

Meriam Gourine

Sales Executive

 Stéphanie Ly

Stéphanie Ly

Customer Service Executive

 Christine Le Garrec

Christine Le Garrec

Customer Service Coordinator

Sheilo Mienandi

Sheilo Mienandi

Customer Service Coordinator

David Barnett

David Barnett

Sales Manager

 Melissa Hill

Melissa Hill

Sales Representative

 Samantha Moodley

Samantha Moodley

Customer Service Executive

Lee Anne Williams

Lee Anne Williams

Customer Service Coordinator

 Jason Wong

Jason Wong

APAC Regional Director

 Rio Nasution

Rio Nasution

General Manager / Sales Manager

Lawrence Teo

Lawrence Teo

Area Sales Manager Malaysia, Sri Lanka and Bangladesh

 Georgina Ng

Georgina Ng

Customer Service Executive

 Dawn Tay

Dawn Tay

Customer Service Executive

David Barnett

David Barnett

Sales Manager

 Melissa Hill

Melissa Hill

Sales Representative

 Samantha Moodley

Samantha Moodley

Customer Service Executive

Lee Anne Williams

Lee Anne Williams

Customer Service Coordinator

 Jaap Schoneveld

Jaap Schoneveld

Sales Manager

 Eric Sprumont

Eric Sprumont

Sales Executive

 Ingrid Geldhof

Ingrid Geldhof

Customer Service Executive

 Femke Goeminne

Femke Goeminne

Customer Service Executive

 Rio Nasution

Rio Nasution

General Manager / Sales Manager

 Rio Nasution

Rio Nasution

General Manager / Sales Manager

 Marcela Tocelis

Marcela Tocelis

Sales Manager / Acting General Manager

 Lina Maria Zuluaga

Lina Maria Zuluaga

Sales Executive

 Martin Vergara

Martin Vergara

Customer Service Executive

 Juan Pablo Pace

Juan Pablo Pace

Customer Service Coordinator

David Barnett

David Barnett

Sales Manager

 Melissa Hill

Melissa Hill

Sales Representative

 Samantha Moodley

Samantha Moodley

Customer Service Executive

Lee Anne Williams

Lee Anne Williams

Customer Service Coordinator

 Paul Bester

Paul Bester

Channel Manager CEETMEIA

David Barnett

David Barnett

Sales Manager

 Melissa Hill

Melissa Hill

Sales Representative

 Samantha Moodley

Samantha Moodley

Customer Service Executive

Lee Anne Williams

Lee Anne Williams

Customer Service Coordinator

 Abigail Waller

Abigail Waller

General Manager / Sales Manager

Farhana Mitha

Farhana Mitha

Sales Executive

 Henrik Marits

Henrik Marits

Sales Manager

Viktor Risendal

Sales Executive Nordic

Margita Thorén

Customer Service Coordinator

 Paul Bester

Paul Bester

Channel Manager CEETMEIA

 Sameen Kadli

Sameen Kadli

Customer Service Executive

 Sibala Libish Kumar

Sibala Libish Kumar

Customer Service Executive

 Paul Bester

Paul Bester

Channel Manager CEETMEIA

 Sameen Kadli

Sameen Kadli

Customer Service Executive

 Sibala Libish Kumar

Sibala Libish Kumar

Customer Service Executive

 Marcela Tocelis

Marcela Tocelis

Sales Manager / Acting General Manager

 Lina Maria Zuluaga

Lina Maria Zuluaga

Sales Executive

 Martin Vergara

Martin Vergara

Customer Service Executive

 Juan Pablo Pace

Juan Pablo Pace

Customer Service Coordinator

 Marcela Tocelis

Marcela Tocelis

Sales Manager / Acting General Manager

 Lina Maria Zuluaga

Lina Maria Zuluaga

Sales Executive

 Martin Vergara

Martin Vergara

Customer Service Executive

 Juan Pablo Pace

Juan Pablo Pace

Customer Service Coordinator

 Marcela Tocelis

Marcela Tocelis

Sales Manager / Acting General Manager

 Lina Maria Zuluaga

Lina Maria Zuluaga

Sales Executive

 Martin Vergara

Martin Vergara

Customer Service Executive

 Juan Pablo Pace

Juan Pablo Pace

Customer Service Coordinator

 Jason Wong

Jason Wong

APAC Regional Director

 Rio Nasution

Rio Nasution

General Manager / Sales Manager

Lawrence Teo

Lawrence Teo

Area Sales Manager Malaysia, Sri Lanka and Bangladesh

 Georgina Ng

Georgina Ng

Customer Service Executive

 Dawn Tay

Dawn Tay

Customer Service Executive

 Rafal Pajak

Rafal Pajak

Sales Manager

 Mateusz Kopecki

Mateusz Kopecki

Sales Executive

 Edyta Bartosz

Edyta Bartosz

Customer Service Coordinator

 Aldona Dziedzic

Aldona Dziedzic

Customer Service Executive

 Myriam Picado

Myriam Picado

General Manager / Sales Manager

 Juan Jiménez

Juan Jiménez

Sales Executive

 Jose Luis Maceda

Jose Luis Maceda

Customer Service Coordinator

 Gloria Villaverde Parrado

Gloria Villaverde Parrado

Customer Service Executive

Maria Jose Municio

Maria Jose Municio

Sales Executive

Maria Jose Municio

Maria Jose Municio

Sales Executive

 Marcela Tocelis

Marcela Tocelis

Sales Manager / Acting General Manager

 Lina Maria Zuluaga

Lina Maria Zuluaga

Sales Executive

 Martin Vergara

Martin Vergara

Customer Service Executive

 Juan Pablo Pace

Juan Pablo Pace

Customer Service Coordinator

 Paul Bester

Paul Bester

Channel Manager CEETMEIA

 Sameen Kadli

Sameen Kadli

Customer Service Executive

 Sibala Libish Kumar

Sibala Libish Kumar

Customer Service Executive

 Ovidiu Nan

Ovidiu Nan

General Manager

Sabine Langmuller

Sabine Langmuller

Customer Service Coordinator

David Barnett

David Barnett

Sales Manager

 Melissa Hill

Melissa Hill

Sales Representative

 Samantha Moodley

Samantha Moodley

Customer Service Executive

Lee Anne Williams

Lee Anne Williams

Customer Service Coordinator

David Barnett

David Barnett

Sales Manager

 Melissa Hill

Melissa Hill

Sales Representative

 Samantha Moodley

Samantha Moodley

Customer Service Executive

Lee Anne Williams

Lee Anne Williams

Customer Service Coordinator

 Paul Bester

Paul Bester

Channel Manager CEETMEIA

 Sameen Kadli

Sameen Kadli

Customer Service Executive

 Sibala Libish Kumar

Sibala Libish Kumar

Customer Service Executive

 Abigail Waller

Abigail Waller

General Manager / Sales Manager

Farhana Mitha

Farhana Mitha

Sales Executive

David Barnett

David Barnett

Sales Manager

 Melissa Hill

Melissa Hill

Sales Representative

 Samantha Moodley

Samantha Moodley

Customer Service Executive

Lee Anne Williams

Lee Anne Williams

Customer Service Coordinator

Marco Roncelli

Marco Roncelli

Sales Executive

 Ilenia Bellotti

Ilenia Bellotti

Customer Service Executive

Daniele Frustagli

General Manager

David Barnett

David Barnett

Sales Manager

 Melissa Hill

Melissa Hill

Sales Representative

 Samantha Moodley

Samantha Moodley

Customer Service Executive

Lee Anne Williams

Lee Anne Williams

Customer Service Coordinator

David Barnett

David Barnett

Sales Manager

 Melissa Hill

Melissa Hill

Sales Representative

 Samantha Moodley

Samantha Moodley

Customer Service Executive

Lee Anne Williams

Lee Anne Williams

Customer Service Coordinator

 Jason Wong

Jason Wong

APAC Regional Director

 Rio Nasution

Rio Nasution

General Manager / Sales Manager

Lawrence Teo

Lawrence Teo

Area Sales Manager Malaysia, Sri Lanka and Bangladesh

 Georgina Ng

Georgina Ng

Customer Service Executive

 Dawn Tay

Dawn Tay

Customer Service Executive

 Ovidiu Nan

Ovidiu Nan

General Manager

Sabine Langmuller

Sabine Langmuller

Customer Service Coordinator

 Ovidiu Nan

Ovidiu Nan

General Manager

Sabine Langmuller

Sabine Langmuller

Customer Service Coordinator

David Barnett

David Barnett

Sales Manager

 Melissa Hill

Melissa Hill

Sales Representative

 Samantha Moodley

Samantha Moodley

Customer Service Executive

Lee Anne Williams

Lee Anne Williams

Customer Service Coordinator

David Barnett

David Barnett

Sales Manager

 Melissa Hill

Melissa Hill

Sales Representative

 Samantha Moodley

Samantha Moodley

Customer Service Executive

Lee Anne Williams

Lee Anne Williams

Customer Service Coordinator

 Jason Wong

Jason Wong

APAC Regional Director

 Rio Nasution

Rio Nasution

General Manager / Sales Manager

Lawrence Teo

Lawrence Teo

Area Sales Manager Malaysia, Sri Lanka and Bangladesh

 Georgina Ng

Georgina Ng

Customer Service Executive

 Dawn Tay

Dawn Tay

Customer Service Executive