Properties
GOHSENX™ LW is a low saponification hydrophilic PVOH that is also compatible with alcohols. So far, 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.
Low saponification PVOHs are usually water insoluble, which is a disadvantage, limiting ease of handling and the scope of applications. In contrast, GOHSENX™ LW has hydrophobicity associated with low saponification PVOHs, but can be handled in the form of an aqueous solution.
Grades List
| Product Grade | Saponification Degree (mol%) | Viscosity*1(mPa.s) | pH*2 | 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 |
*2 : 4% aqueous solution at 30 degree C
Applications
Secondary Suspension Agent for Polyvinyl Chloride Polymerization
By using GOHSENX™LW series as secondary suspension agent for polyvinyl chloride polymerization, it’s possible to improve the properties of PVC resins.
- Good efficiency
- Less foaming
- Higher porosity
- Higher absorption of plasticizers
- Fewer fish eyes
- Elimination of residual VCM
PVC Polymerization Result
Coating Agent
GOHSENX™ LW products have, in their molecular structure both a hydrophilic portion. They can be dissolved in or absorb water, and various polar organic solvents such as methanol, ethanol, acetone, ethylene glycol and DMSO.
Solubility / Liquid Absorption Properties of GOHSENX™ LW
| Solvent | Solvent Solubility Parameter | Dissolubility/liquid Absorption Property |
|---|---|---|
| (cal · cm-3)1/2 | LW-100 | |
| n-hexane | 7.4 | C |
| Cyclohexane | 8.2 | C |
| 1,1,1-trichloroethane | 8.5 | C |
| Toluene | 8.9 | C |
| Methyl ethyl ketone | 9.0 | B |
| Cyclohexanone | 9.3 | B |
| Tetrahydrofuran | 9.3 | B |
| Trichloroethylene | 9.4 | B |
| Acetone | 9.7 | B |
| 1,2-dichloroethane | 9.9 | B |
| Pyridine | 10.6 | A |
| Acetonitrile | 11.8 | B |
| Ethanol | 12.9 | B |
| DMSO | 13.0 | A |
| Methanol | 14.5 | A |
| Ethylene glycol | 14.5 | A |
A: fully dissolved, B: almost dissolved, C: virtually not absorbing liquid
| Product Grade | Saponification Degree (mol%) | Tg (degree C) water 0% | Tg (degree C) 20 degree C 65% RH | TM (degree C) |
|---|---|---|---|---|
| LW-100 | 43.1 | -0.5 | -13.4 | – |
Measuring conditions: Measurement with DSC (temperature increase/decrease rate: 10 degree C/min
| Product Grade | COD (mg/kg)x 104 | BOD5 (mg/kg)x 10S2 |
|---|---|---|
| LW-100 | 80 | 110 |
| Corn starch | 36 | 7,400 |
- Measuring conditions: COD (Mw) JIS K0102-17 (1998)
BOD5 JIS K0102-21/32.3 (1998) - Measurement: Registration No. of measurement certification enterprise, Osaka No. 10013, KK Osaka Environmental Technology Center
