Hydrogenated Polybutadiene

POLYTAIL™

Low Molecular Weight Polyolefin Polyol

Product Description
Typical Properties
POLYTAIL™H Melting point 60~70°C
Density (@25°) 0.89g/cm
Viscosity (@100°) 10~16 poise
Iodine number <5 g/100g
Hydroxyl number 37~53 KOHmg/g
Moisture <0.1 wt%
POLYTAIL™HA Density (@25°) 0.87g/cm
Viscosity (@80°) 6~19 poise
Iodine number <5 g/100g
Hydroxyl number 41~55 KOHmg/g
Moisture <0.1 wt%


Characteristics of POLYTAIL™

Saturated hydrocarbon skeleton, reactive OH groups in its molecular structure

Good compatibility with polyolefines and EPR rubbers

As polymer additive, enhances adhesion properties of polyolefin compounds

POLYTAIL™ derivatives have

Excellent thermal and hydrolysis stability

Excellent electrical properties

Compatibility with non-polar materials

The Characteristics and Applications of Low Molecular Weight Polyolefin POLYTAIL™

Because of the excellent characteristics of electrical and mechanical properties as well as the cheapness, polyolefin resins are widely used for electrical insulation, film, food packaging and other fabricated products. In addition, various low molecular weight polyolefins have been placed on the market. As these products have their own characteristics high molecular weight polyolefins don't have, keeping the excellent properties of polyolefin resins, they have been applied to areas such as plastics processing aids, pigment dispersion, improvement of abrasion resistivity of printing links.

However, their applications are limited in the additives uses, because they don't have functional groups in the molecule. Much broader and new applications can be expected, if low molecular weight polyolefins, having functional groups such as hydroxy group especially at the end of the molecule, is developed.

Focusing on these points, Mitsubishi Chemical successfully developed POLYTAIL™ which is a low molecular weight polyolefin having a hydroxy group at the end of the molecule (polyolefin polyol). This product has been paid attention in the market because of its unique features. POLYTAIL™ is a registered trade mark for the polyolefin polyols.

Table 1 shows the characteristics and applications of main grades of Polytail.

Table 1
Grade Characteristics Applications
Base Resin Polytail H Solid at room temp.
Liquifies when heated above 65°C solidified urethane products have excellent electrical, mechanical properties and water, heat and chemical resistance good compatibility with polyolefins and rubbers
Urethane casting for electrical insulation
Modifier of resins and rubber (such as giving reactivity) raw materials as polyols for polyurethanes and polyesters coating material Adhesives
Polytail HA Liquid at room temp.
Good compatibility with polyolefins and rubbers
Same as POLYTAIL H. HA is used with Polytail H as a complementary component.

1-1 Properties and Characteristics
There are two grades in POLYTAIL, solid wax type (POLYTAIL H) and liquid type (POLYTAIL HA) at room temperature. Both of them have saturated hydrocarbon structure containing hydroxy group at the end of the chain and the molecular weight is 3,000 to 4,000. Therefore, these are the telechiric polymers. Table 2 shows the basic properties of POLYTAIL.

Product Specifications,k
Table 2 - Basic Properties of Polytail
  Polytail H Polytail HA

Appearance (at room temp.)
Melting Point (°C)
Viscosity (poise)
Density (g/cm)

Coefficient of Volume Expansion (deg -1)
Heat Conductivity (cal, cm-1, sec-1, deg-1)
Hydroxy Group Value (KOH mg/g)
Iodine Value (g/100g)
Water Content (wt. %)

Waxy solid
60-70
13±3(100°C)
0.894(25°C)
0.814(100°C)
0.760(200°C)
0.734(250°C)
7.4 x 10-4
1.08 x 10-3
44±5
<5
<0.1
Liquid
-
500-1,000(30°C)
0.870(25°C)
0.853(50°C)
0.823(100°C)
0.794(150°C)
7.4 x 10-4
-
40-55
<5
<0.1

Product Specifications,k
Table 2 - Basic Properties of Polytail
  Polytail H Polytail HA

Appearance (at room temp.)
Melting Point (°C)
Viscosity (poise)
Density (g/cm)

Coefficient of Volume Expansion (deg -1)
Heat Conductivity (cal, cm-1, sec-1, deg-1)
Hydroxy Group Value (KOH mg/g)
Iodine Value (g/100g)
Water Content (wt. %)

Waxy solid
60-70
13±3(100°C)
0.894(25°C)
0.814(100°C)
0.760(200°C)
0.734(250°C)
7.4 x 10-4
1.08 x 10-3
44±5
<5
<0.1
Liquid
-
500-1,000(30°C)
0.870(25°C)
0.853(50°C)
0.823(100°C)
0.794(150°C)
7.4 x 10-4
-
40-55
<5
<0.1

Solubility
POLYTAIL is easily soluble in aromatic solvents such as benzene and toluene and chlorine containing solvents such as trichlenes, but is not soluble in ketones, esters and alcoholic solvents. On the other hand, POLYTAIL HA can be soluble in some of the ketones and ester type solvents.

Compatibility
POLYTAIL is compatible with plasticizers, petroleum type oils, vegetable oils and unsaturated fatty acids, but is not compatible with silicone oils, epoxy resins, etc. For polymers, POLYTAIL is compatible with polyolefin resins and hydrocarbon type rubbers like EPR, BR and SBR but it is not compatible with polar rubbers such as NBR and CR, and silicone rubber.

Heat Stability
Because POLYTAIL has a saturated hydrocarbon skeleton and has no double bond, the heat stability is excellent. The TGA thermal decomposition curve of POLYTAIL H is comparable to polyethylene.

Adhesive property
POLYTAIL urethane has very good bonding property with various substrates. Table 11 and 12 shows the strength with metals and vulcanized rubbers. However, it should be noted that the strength is greatly affected by the chemical and physical properties of the substrate surface and by the formulation in case of runners.

One of the applications of Polytail is to mix with resins or runners to give reactivity. The adhesive strength of POLYTAIL urethane with vulcanized rubbers which contain POLYTAIL, bonding strength is greatly improved with the increase of Polytail content.

Table 11 - Adhesive Strength with Metals
Substrate 90 deg
Peeling Strength
(kg/cm, JIS K6301)
Mild steel                                  (SPCC-SB) 13.3
Stainless steel                           (SUS-304) 7.7
Copper                                       (TCUP-1) 5.2
Brass                                          (BSP-3) 3.9
Steel-zinc                                  (SPCC-B) 6.6
Brass-nickel                                (BSP-3) 6.2
Copper-tine                                 (TCUP-1) 3.4
Polytail H/Isonate143L, NCO/OH 1.1 120°C, 60 min curing

Table 12 - Adhesive Strength with Vulcanized rubbers
Substrate Adhesive strength
Tensile strength (kg/cm 2 ) T peeling
(kg/cm2 )
EPDM (vulcanized at 160°C, 15 min) 66   11 (Rubber like break)
SBR (vulcanized at 150°C, 15 min) --- 11 (Rubber like break)
NR (vulcanized at 150°C, 8 min) 9 ---
Polytail H/Isonate143L, NCO/OH 1.1 150°C, 5 min curing


Applications of POLYTAIL™

As Additive
Coated Film Adhesion Test
Bumper Fascia Compound PP/EPR PP/EPR
POLYTAIL™ Yes No
Formulation (pbw) Polypropylene 70 70
Olefin rubber 30 30
POLYTAIL™ 3 0
Talc 7 7
Cross Hatch Mark Test Initial (1) 100/100 95/100
Water aging(2) 100/100 58/100
Humid aging (3) 100/100 18/100
Immersion Test (@20°C) Gasoline Passed Failed
Gasohol (4) Passed Part
Oxynol (5) Passed Failed

Improves adhesion properties of polyolefin compound
Modifies surface properties of non-polar polymers
Improves dispersability of inorganic fillers in hydrocarbon polymers

note 1: water degreasing process
note 2: Acryl-chlorinated PP printer 7 m (80°C x 10min)
Urethane top coat 20 m (80°C x 45mm)
note 3: (1) 2sq. m/m Cross Hatch 1 time
(2) 40°C x 24hr + 1hr dry in ambient
(3) 50°C x 95RH% x 240 hr + 1hr dry in ambient
(4) Gasoline/EtOH = 90/10
(5) Gasoline/MeOH/t-BuOH = 90/5/5

As Macromer:
Electrical insulator
Polyolefin Coatings
Waterborne Coatings
Adhesives and Sealants
Waterproofing Sealants