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Speciality Grades
Low Saponification PVOH

GOHSEFIMER L SERIES

GOHSEFIMER L SERIES resins were specifically developed as a suspending additive for the polymerization of vinyl chloride. GOHSEFIMER L SERIES resins can be used in conjunction with suspension agents such as GOHSENOL GH, KH, KP, or KZ type PVOH.

  Properties
By using GOHSEFIMER L SERIES as an Auxiliary:
• The workability of vinyl chloride resin (PVC) is improved.
• A larger porosity is attained.
• Uniformity in porosity improves.
• Plasticizer absorbing speed increases.
• Gelation speed increases.
• Fish-eye occurrence significantly decreases.

The amount of residual vinyl chloride monomer (VCM) in the PVC will be greatly decreased. As a result, the product can be safely used as a food packaging forming material.

The product helps decrease the energy consumption of PVC manufacturing and forming processes.
• The drying time of the manufacturing process is shorter, and the energy consumption in the VCM-removal column is decreased.
• Furthermore, in the forming process, PVC is readily disintegrated into primary particles to lead to improved forming efficiency.


Product Grades and Technical Data
Product Grade
Volatile Matter
Viscosity (cps)
Saponification Degree (mol% )
Particle Size
LL-02
5.0 or less
7.5 ~ 9.5
45.0 ~ 51.0
All particles pass #7 mesh.
L-5407
5.0 or less
9.0 ~ 13.0
34.0 ~ 38.0
All particles pass #7 mesh.
L-7514
5.0 or less
20.0 ~ 28.0
34.0 ~ 38.0
All particles pass #7 mesh.
Viscosity: mixture solution of 10.0% methanol and water (1/1, volume ratio)




Solubility
Solvent
LL-02
L-5407
L-7514
Water
Δ
Δ
Δ
Water/methanol=1/1
Methanol
Ο ~ Δ
Ο
Ο
Ethanol
Ο ~ Δ
Ο
Ο
Acetone
Ο ~ Δ
Ο
Ο
Methyl acetate
Δ
Ο
Ο
Toluene
×
×
×
Trichlene
×
Δ
Δ
Solubility of GOHSEFIMER L SERIES products in water is low.
Solubility (High) > Ο > Δ > × (Low)




Mechanical Properties
Product Grade
Initial Young's Modulus
(109dyne/cm2)
Yield Strength
(kg/cm2)
Rupture Strength
(kg/cm2)
Elongation
(%)
LL-02
~ 4.5
112
126
130
L-5407
~ 5.0
125
140
145
L-7514
~ 10.5
270
219
45 ~ 160
Measuring conditions:
Film; 150-200μ×40mm×15mm
Humidity; 20 degree C×65% RH×7 days
Pull speed with autograph, 100 mm/min, 7 cycles




Thermal Properties
 
LL-02
L-5407
L-7514
Incipient fluidization temperature
Approx. 100 degree C
Approx. 100 degree C
Approx. 110 degree C
Incipient fluidization viscosity
150ps
300ps
4000ps
Decomposition temperature
250 degree C or higher
250 degree C or higher
250 degree C or higher
Grass transition point
Approx. 50 degree C
Approx. 50 degree C
Approx. 45 degree C
Measuring conditions:
Koka flow tester
Load 20 kg/cm2, heat increase rate 1 degree C/min, Orifice dia. 1m/mΦ×10m/mL




Optical Properties
Refractive index (nD20): 1.494 ~ 1.521
  Saponification degree 1.494 at 30.0 mol%
1.521 at 50.0 mol%


Physiological Properties
• The physiological properties data for GOHSEFIMER L PVOH is currently unavailable. However, because GOHSEFIMER L SERIES products are low saponification PVOH, their physiological properties may be considered to be identical to those of polyvinyl alcohol.
In a general sense, polyvinyl alcohol is physiologically harmless and has been approved as a cosmetic raw material (cosmetic standard) or drug additive (registered in Japanese Pharmaceutical Codex). It has also been approved as a coating resin for food wrapping by the FDA of America (No. 175300).
In particular, the solubility of GOHSEFIMER L PVOH in water is significantly low compared to generic PVOH, and is therefore considered to be not readily absorbed in the human or animal mechanism.
• Existing chemical substance registration number
6-687
Registered as a vinyl alcohol-vinyl acetate copolymer.
• Already registered in our voluntary control standard on vinyl chloride food wrapper.
In Japan, registered in the PL standard "3-A-II-9" of Japan Hygienic PVC Association (JHP).
3:
 Chapter 3 List of usable additives
A: Vinyl chloride polymer and polymer additives
• : Polymer additives for vinyl chloride
9: Polyvinyl alcohols that contain 50 wt% or more vinyl acetate in terms of polymer unit
From these facts, GOHSEFIMER L PVOH is considered to be physiologically inactive.


Safety
• Explosivity: Assumed to be the same as generic GOHSENOL
(dust explosion approx. 520 degree C)
• Combustibility:Applies to special combustibility category (synthetic resins) according to the enforcement ordinance of the Fire Act.


Other Precautions
GOHSEFIMER L PVOH is a stable polymer compound, and does not usually putrefy, decompose or depolymerize.
However, owing to a lower glass transition point, conglutination can occur among its particles when stored under a high temperature/humidity, and under a heavy load. If storing in rainy or hot seasons, be very careful to avoid the above conditions.