Specialty Grades
Low Saponification PVOH LW Series
GOHSENX™ LW Series (Water solution)
GOHSENX™ LW is a low saponification PVOH that is hydrophilic and compatible with alcohols.
Low saponification PVOHs (35 to 60 mol% saponification) have been used in diverse applications including hot melt resins, dispersing auxiliaries for suspension polymerization of vinyl chloride, adhesives, coating agents, binders, and pressure-sensitive adhesives.
However, since low saponification PVOHs are usually water insoluble, the handling or development of applications is restricted.
In contrast, GOHSENX™ LW can be handled in the form of aqueous solution maintaining hydrophobicity.
Structural formula
Properties
- Can be handled in the form of an aqueous solution which has high concentration.
(crystallizes in a low level of aqueous solution)
・Maintains lipophilicity (an affinity for alcohol)
| Grade | Saponification Value (mol % ) |
Viscosity *1 (mPa・s) |
Product Form | Applications |
|---|---|---|---|---|
| LW-100 | 39.0 - 46.0 | 500 - 2,500 | 39 - 41% aqueous solution | Dispersing auxiliary for suspension polymerization of vinyl chloride Adhesives Binder Anchor coating agent |
| LW-200 | 46.0 - 53.0 | 500 - 2,000 |
*1 : Viscosity measured by 39 - 41% aqueous solution at 25℃
- Solubility/Liquid Absorbing Property
- GOHSENX™ LW products have, in their molecular structures, both hydrophilic portion and hydrophobic portion. They dissolve in or absorb water, and various polar organic solvents such as methanol, ethanol, acetone, ethylene glycol, DMSO, and Trichloroethylene.
| Solvent | Solvent Solubility Parameter | Dissolubility/liquid Absorption Property | |
|---|---|---|---|
| (cal・cm-3)1/2 | LW-100 | LW-200 | |
| n-hexane | 7.423 | × | × |
| Cyclohexane | 8.182 | × | × |
| 1,1,1-trichloroethane | 8.544 | × | × |
| Toluene | 8.907 | × | × |
| Methyl ethyl ketone | 9.038 | ○ | ○ |
| Cyclohexanone | 9.255 | ○ | ○ |
| Tetrahydrofuran | 9.317 | ○ | ○ |
| Trichloroethylene | 9.35 | ○ | ○ |
| Acetone | 9.712 | ○ | ○ |
| 1,2-dichloroethane | 9.91 | ○ | ○ |
| Pyridine | 10.58 | ◎ | ◎ |
| Acetonitrile | 11.8 | ○ | ○ |
| Ethanol | 12.9 | ○ | ○ |
| DMSO | 13 | ◎ | ◎ |
| Methanol | 14.5 | ◎ | ◎ |
| Ethylene glycol | 14.5 | ◎ | ◎ |
NOTE
◎:fully dissolved ○:almost dissolved ×:virtually not absorbing liquid
| Grade | Saponification Value (mol %) |
Tg(℃)(1) (Dry) |
Tm(℃)(1) |
|---|---|---|---|
| LW-100 | 43.1 | -0.5 | - |
| Standard PVOH | 47.3 | 42.9 | - |
(1) Measuring conditions: Measurement with DSC (temp. increase / decrease rate: 10℃/min)
| Polymer | COD (mg/kg) ×104 | BOD5 (mg/kg) ×102 |
|---|---|---|
| GOHSENX™ T-330 | 80 | 110 |
| GOHSENOL™ | 60 - 100 | 50 - 100 |
NOTE
(1) Measuring conditions:COD(Mw) JIS K0102-17(1998) BOD5 JIS K0102-21/32.3(1998)
(2) Measurement:Registration No. of measurement certification enterprise, Osaka No. 10013, KK Osaka Environmental Technology Center
