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Speciality Grades
Anionic PVOH

GOHSERAN
GOHSERAN L has excellent properties beyond those of standard PVOH resins. It is used as an emulsifier, dispersant, adhesive, coating agent, and binder, and new applications are being found regularly.

It is a modified PVOH with a sulfonic group (-SO3X group) on its side chain.

Properties
 
L-3266
Excellent emulsifying power and protective colloid properties.
In acrylic or styrene emulsion form, it is capable of stable emulsification polymerization unachievable with standard PVOH. The GOHSERAN-based emulsion boasts excellent stability and has various additional features.
It is a powerful dispersant of organic or inorganic materials.
 
L-0301、L-0302
As well as being water-soluble, these grades are also soluble in an organic solvents such as methanol, ethanol, methyl acetate or acetone, and in aqueous mixture solutions.
They become molten at a temperatures of 100 to 180 degree C, and are capable of coating and bonding as a hot melt materials.
They are effective as a dispersant or binder for organic or inorganic material.


Technical Specifications
Product Grade
Saponification Degree
( mol% )
Viscosity
( mPa•s )
Applications
L-3266
86.5 ~ 89.0
2.3 ~ 2.7
Dispersant, emulsifier
L-0302
43.5 ~ 49.5
13.0 ~ 17.0b)
Hot melt adhesive
L-0301
5.0 ~ 7.0b)
a) Viscosity of 4% aqueous solution at 20 degree C
b) 10% aqueous solution of water/methanol




Table 1 Example Test Results of Emulsion Polymerization
Polymerization Recipe
Surfactant Recipe
GOHSERAN L-3266 Recipe
Monomer
Butyl
acrylate
Ethyl
acrylate
Butyl
acrylate
Ethyl
acrylate
Styrene
Solid content (%)
40
40
40
40
40
Coagulation (%/monomer)
4
3
Trace amount
Trace amount
Trace amount
Emulsification state
Ο
Ο
Ο
Ο
Ο
Viscosity (cps at 30 degree C)
9
9
4600
2800
1200
Structural viscosity index
0.71
0.69
0.62
Grain size (mu)
140
60
60
45
Low temperature stability
Δ
Δ
Ο
Ο
Ο
Transparency of film
Ο
Ο
Ο
Ο
Ο
Emulsification polymerization
 
Polymerization recipe:
Monomer concentration 40%
 
Emulsifier (%/whole system)
 
Surfactant; LEVENOL WZ/NOYGEN ET-170 0.3/1.2
 
GOHSERAN L-3266 4.0
 
Polymerization initiator, and additive (%/whole system)
 
Potassium peroxosulfate/sodium secondary phosphate 0.2/0.33
Duration of dripping of monomer
3 hours
Polymerization temperature
60-70 degree C




Polymerizaiont Recipe, Surfactant Recipe, GOHSERAN L-3266 Recipe
 
GOHSERAN L-0301
GOHSERAN L-0302
Solubility in:
Water
 
Water/methanol
 
Methanol, ethanol
 
Methyl acetate, ethyl acetate
 
Acetone, methyl ethyl ketone
 
Toluene, trychlene
Ο
Ο
Ο
Ο
Ο
×
Δ
Δ ~ Ο
Ο
×
×
×
Heat melting
property:
Incipient fluidization temperature ( degree C), absolutely dried
 
20 degree C, 65% RH
 
Melt viscosity (poise)
160 degree C
 
 
180 degree C
 
 
200 degree C
 
Tg ( degree C)
95
2500
850
300
45
135
80
11000
5400
1100
57
Film:
Solubility in water (%)
Physical property:
Equilibrant hygroscopicity (%)
20 degree C, 65% RH
 
 
40 degree C, 90% RH
 
Initial Young's modulus (109dyne/cm2
 
Yield strength (kg/cm2)
 
Rupture strength (kg/cm2)
 
Elongation (%)
100
4
12
6
68
1
100
11
28
4
93
148
189
Thermal melting properties
Koka flow tester; orifice, dia. 1mmΦ×L10mm
 
load 10 kg/cm2, temperature increase rate 1 degree C/min
 
Melt viscosity 20kg/cm2
Film properties
200μ-thick
 
Solubility in water Immersed in water at 20 degree C for 24 hours
 
Tensile strength Autograph, tensile speed 100 mm/min
20 degree C×65% RH


  1. Example of Polymerization of vinyl acetate using GOHSERAN L-3266
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