Polyolefinic primers and adhesives for coating and bonding polypropylene (PP) and various engineering plastics, rubber and other materials, and as adhesives to bond metals to polyolefins in automotive, packaging and paint applications.
UNISTOLE™
Polyolefinic Primers/Adhesives
Applications detail
Applications
Characteristics
- Introduction
- UNISTOLE™ P / R
- Olefin Varnish XP
Mitsui Chemicals America, Inc. offers two types of UNISTOLE™, which are primers and adhesives mostly composed of liquid modified polyolefins.
- UNISTOLE™ P is a liquid primer for coating and bonding polypropylene (PP) and various engineering plastics, rubber and other materials, which do not readily bond.
- UNISTOLE™ R is a modified polyolefin dispersed in hydrocarbon-based solvent used as an adhesive for bonding metals to polyolefins. This can also be used as a metal coating agent.
- Olefin Varnish XP is a modified Olefin based varnish for adhesive based on a non-chlorinated modified olefin. It can be used for ink binders, primers for olefin substrates, and hot melt adhesive for vaccum pressure forming.
These polyolefinic primers and adhesives are used in automotive, packaging and paint applications.
The advantages of using Mitsui Chemicals' line of polyolefinic primers and adhesives are:
- Excellent secondary adhesion
- Exceptional heat resistance and heat resistant adhesion
- Excellent electrical insulating properties
- Enables impact resistance
- Excellent gasoline resistance
- Flexible at low temperatures
- Excellent low temperature processability
- Exceptional thermal adhesion
- Low tackiness
- High elongation
- Solvent resistance
- Hot water resistance
Related Products
UNISTOLE™ P Polyolefinic Primer/Adhesive
UNISTOLE™ P is a liquid primer for coating and bonding polypropylene (PP) and various engineering plastics, rubber and other materials, which do not readily bond other materials. It is widely used as adhesion promoting agent for substrates such as PP, TPO, TPE, EPDM, Nylon 6, RIM Urethane, PBT, FRP, ABS, EVA, Polyimide, Modified PPO and their blends.
UNISTOLE™ R Polyolefinic Primer/Adhesive
UNISTOLE™ R is a modified polyolefin dispersed in a hydrocarbon-based solvent using polyolefin modification and dispersion technology developed by Mitsui Chemicals. The material is used as an adhesive for bonding metals to polyolefins, such as bonding metal foil and PP for retort, PTP and easy peel packaging.
Metal foil when coated with this modified polyolefin can be thermally bonded to PP film or sheet
Coating Process
There are several chlorine free grades of UNISTOLE R which can be used with basic equipment such as gravure, roll coaters and sprays.
- Adhesive for bonding metal foil and a polyolefin such as aluminum foil and PP film to make retort packages, PTP packages, easy peal packages, etc.
- Metal coating agent (bonding of metal by extruding PP onto it, automotive parts, etc.).
- Modifier when added to paints, adhesives, printing inks, since it improves adhesion to PP.
Typical Applications
Olefin Varnish XP
Mitsui Chemicals offers a line of Modified-Olefin-Based Varnish. Olefin Varnish XP includes four grades. XP012 is the standard. XP002 has the lowest tackiness and the highest transparency and XP102 and XP112 have improved thermal resistance over XP002 and XP012. You can also use them in two pack curing system by adding HEXAMETHYLENE DIISOCYANATE (HDI) polyisocyanates which are Isocyanate curing agents, in order to improve film strength and adhesiveness.
With excellent thermal adhesion, low tackiness, and high elongation, Olefin Varnish XP reduces material costs and improves end product robustness. The line’s low temperature processability and tackiness are its key distinguishing features.
Excellent Thermal Adhesion
This varnish for adhesion has excellent thermal adhesion at approximately 100°C. XP012 shows excellent adhesiveness on a range of substrate materials, from hard-PP, soft-PP, ABS, Polycarbonate, PMMA, Acryl, PET, PPS, glass and metals (such as aluminum). In addition, cured XP012 also shows improved adhesiveness on polycarbonate/ABS alloy. XP002 has a more limited application, with excellent adhesiveness on Soft-PP and select metals only.
This varnish facilitates excellent adhesiveness at low heat sealing temperature. The following chart shows that heat sealing below 100°C can yield more than 10N/cm peel strength.
The following chart shows the thermal resistance performance at various temperatures. The line has 10N/cm peel strength even at 80°C.
Low Tackiness
Compared to conventional chlorinated PP or an acrylic adhesive, XP002 and XP012 have lower tackiness, even at temperatures below 50°C.
Due to the line’s low tackiness, a transparent, homogenous and tack-free flexible film can be obtained at room temperature.
High Elongation
The varnish can maintain superior adhesion performance at high elongation. Testing has shown that adhesion performance is maintained even at 250-500% elongation. These results indicate that it can be used for vacuum pressure forming to achieve surface decoration of 3D forms with overlaid decorated plastic films.
Resistance to Solvents and Hot Water
XP002 exhibits good resistance to various solvents such as IPA, ethanol, toluene, and MEK. The line is also resistant to hot water at 60°C.
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