Urethane Pressure Sensitive Adhesives (PSA)"POLYTHICK UP"


Our Proprietary Special Polyols Solve the Drawbacks of Conventional Urethane Pressure Sensitive Adhesives (PSA). 
Stable Adhesive Properties Independent of Temperature and Peeling Speed Actualizes Oil and Abrasion Resistance Unique to Urethane.

Sanyo Chemical's Polyurethane Pressure Sensitive Adhesive "POLYTHICK UP" Products are here! 

1

Stable Adhesive Properties Independent of Temperature and Peeling Speed 

 

2

"POLYTHICK UP" Has Oil and Abrasion Resistance Unique to Urethane

 

3

Solves the Weak Points of Conventional Urethane Adhesives with our Proprietary Special Polyols

  • High viscosity from high molecular weight of the prepolymer
  • Improved cohesion and film strength due to increased cross-link density during curing
  • Improvement of long-term adhesion properties by reducing impurities and low molecular weight components

Potential and Challenges of Urethane Pressure Sensitive Adhesives 

In urethane adhesives, a solution of polyol (OH) as the main agent, poly isocyanate (NCO) as the curing agent, and additives is coated on a substrate such as film and heated to cross-link and cure to form the adhesive layer. 

Advantages of Urethane Pressure Sensitive Adhesives

  • In addition to low dependence on time, temperature, peeling speed, etc., it has excellent oil resistance and abrasion resistance unique to urethane.
  • Since it consists of two components, the main agent and hardener, it is easy to control physical properties such as reactivity, hardness, and elastic modulus, and it is expected to be applied to a wide range of applications.

Comparison of Acrylic and Urethane Pressure Sensitive Adhesives

Acrylic Pressure Sensitive Adhesive Urethane Pressure Sensitive  Adhesive
<Features>
  1. Solvent-free type lineup. (UV cross-linking is also possible with hot-melt coating = low VOC) 
  2. Adjusting the performance by choosing acrylic monomers to polymerize 
    (high tackiness, low adhesive residue, low dielectric strength, and substrate adhesion) 
<Features>
  1. Small temperature and frequency dependence of adhesive strength. Higher molecular weight due to application of our seeds (special polyether)

  2. High adhesive film strength and less adhesive residue
  3. Improved cohesive strength allows for stronger adhesion
Low modulus of elasticity above room temperature and high tanδ
⇒High tackiness and instantaneous adhesion
Small temperature dependence of viscoelasticity curve
⇒Little temperature dependence of adhesive strength

Problems with Conventional Urethane Pressure Sensitive Adhesives

Conventional urethane adhesives have the following issues, which have limited their applications.

  1. Adhesive strength is difficult to adjust due to the high cohesive strength of the urethane group.
  2. When the cohesive strength or cross-link density of hard segments is reduced to improve adhesion, the strength of the adhesive layer decreases, leading to glue residue.
  3. Difficult to adjust to appropriate viscosity due to difficulty in achieving high molecular weight


Sanyo Chemical's Urethane Pressure Sensitive Adhesives 
 Features of "POLYTHICK UP"

Sanyo Chemical's "POLYTHICK UP" products of urethane adhesives solves the problems of conventional urethane adhesives by introducing special polyols. 

  • High viscosity from high molecular weight of the prepolymer
  • Improved cohesion and film strength due to increased cross-link density during curing 
  • Improved long-term adhesion properties due to reduced impurities and low molecular weight components 

Application Examples and Features to be Utilized

Slight to Weak Adhesion Range

Protective film for electronic components and optical films
  •  Stable adhesive properties 
  •  Removability 
  •  Low Contamination 
  •  Urethane film strength 
  •  Antistatic properties 
Lamination and masking of automotive and construction components
  •  Stable adhesive properties 
  •  Durability 
  •  Weather resistance 

Medium to Strong Adhesion Range

Lamination of touch panels and display components
  •  Stable adhesive properties 
  •  Low contamination 
  •  Small temperature dependence 
Holding electric/electronic components and optical components during transport to the next process
  •  Stable adhesive properties 
  •  Low contamination 
  •  Small temperature dependence 
Adhesive tape for fixing medical tubes and catheters,
film dressing materials for medical use,
surgical tapes, wearable applications, etc.
  •  Low odor and skin irritation 
  •  Comfortable due to high moisture permeability 

Main Lineup of the "POLYTHICK UP" Products 

POLYTHICK UP products (Developmental product) 
Type Slight adhesion type
(Solvent-based)
 Slight adhesion type
(Solvent-based)
Medium adhesion type
(Solvent-free)
Strong adhesion type
(Solvent-based)
Base POLYTHICK UPW-1
(OH-terminated prepolymer)
POLYTHICK UPW-2
(OH-terminated prepolymer)
POLYTHICK UPS-1A
(OH-terminated prepolymer)
POLYTHICK UPK-2
(OH-terminated prepolymer)
Hardener Polyfunctional isocyanate Polyfunctional isocyanate

POLYTHICK UPS-1B
(NCO-terminated prepolymer)

Polyfunctional isocyanate
Base/hardener
(by weight)
98/2 94/6 60/40 99.5/0.5
Base property Appearance Colorless to pale yellow liquid
Viscosity at 25°C (mPa・s) 10000 8000 20000 5000
Evaporated residue 50 (ethyl acetate) 40 (ethyl acetate) 100 30
(ethyl acetate/THF)
Molecular weight Mw  60000 200000 20000 200000‐300000
Cured properties Adhesion strength 0.04
(Toward glass, Adhesive film thickness: 30 μm)
0.02
(Toward glass, Adhesive film thickness: 30 μm)
12
(Toward SUS, Adhesive film thickness: 30 μm) 
21
(Toward SUS, Adhesive film thickness: 30 μm) 
Retention strength (mm/24h) 0.0 0.0 0.0 0.0
Tg(℃) <-20℃ <-20℃ <-35 ℃ <-45 ℃
Surface resistivity (Ω/□) 108 (With antistatic agent)
1012 (Without antistatic agent)
Humidity permeability (A-1 method) (g/m2/day)  3000 (30μm)
Transparency (Haze) 0.3 (30μm) 0.3 (30μm) 0.3 (30μm) 0.4 (30μm)
Refractive index 1.47 1.47 1.46 1.47
Advantages Special polyethers are used to achieve high molecular weight. 

  •  Faster curing speed, stable adhesion, and improved cutting performance
  •  Low molecular weight content and excellent stain resistance
High molecular weight by using special polyols

  •  High adhesive strength, but less susceptible to cohesive breakdown
  •  Low molecular weight content and excellent stain resistance

Related Information

Related Products

Technology and Application Topics

  • Pressure Sensitive Adhesive

Pressure Sensitive Adhesive Basics


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