|
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 |
|
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 |
3.9
|
| 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
|
