 GOHSEFIMER LW SERIES
 |
GOHSEFIMER 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 auxiliaryies 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, GOHSEFIMER LW has hydrophobicity associated with low saponification PVOHs, but can be handled in the form of an aqueous solution.
|
 |
| Product Grade |
Saponification Degree
( mol % ) |
Viscosity
( mPa•s ) |
Product
Form |
| LW-100 |
39.0 ~ 46.0 |
1000 ~ 2000 |
39 ~ 41% aqueous solution |
| LW-200 |
46.0 ~ 53.0 |
500 ~ 2000 |
| LW-300 |
53.0 ~ 60.0 |
500 ~ 2000 |
|
| NOTE |
1) |
Viscosity of 39-41% aqueous solution
at 25 degree C |
|
|
Properties
 |
The Trend of Cloud Points of GOHSEFIMER LW at Various Resin Concentrations in an Aqueous Solution |
| |
Cloud points in aqueous solution were evaluated between 5% - 40% PVOH content. Each test run was performed using an integrating-sphere turbidimeter (Mitsubishi Chemical Corp.), with a temperature increase rate of 1 degree C/min, thereby the temperature at which coagulation/precipitation of poval started in aqueous solution was measured.
|
|
|
The State of GOHSEFIMER LW Solution |
| |
The dependency of the state of the solution (whether or not precipitation occurs) on the concentration was measured by allowing aqueous GOHSEFIMER LW solution ('LW-100 to 300) to stand at 30 degree C.
Although the results somewhat vary depending on the saponification degree of the sample, the aqueous GOHSEFIMER LW solution remains stable through a relatively high concentration range. However, the lower the concentration in aqueous solution, the more prone it is to precipitation.
Dependency on Resin Concentration with Aqueous GOHSEFIMER LW Solution being Allowed to Stand at 30 degree C |
|
The Trend of Viscosity in Water or Methanol |
| |
Using a Brookfield viscometer, the variation in viscosity was measured with
40% aqueous solution and 40% methanol solution kept at 25 degree C and was evaluated.
|
|
Solubility/Liquid Absorbing Property |
| |
GOHSEFIMER LW products have, in their molecular structure both a hydrophilic portion and a hydrophobic portion. They can be dissolved in or absorb water, and various polar organic solvents such as methanol, ethanol, acetone, ethylene glycol and DMSO. |
 |
| Solvent |
Solvent Solubility Parameter
(cal•cm-3)1/2 |
Dissolubility/liquid
Absorption Property |
|
LW-100 |
LW-200 |
LW-300 |
|
| n-hexane |
7.423 |
× |
× |
× |
| Cyclohexane |
8.182 |
× |
× |
× |
| 1,1,1-trichloroethane |
8.544 |
× |
× |
× |
| Toluene |
8.907 |
× |
× |
× |
| Methyl ethyl ketone |
9.038 |
Ο |
Ο |
Δ |
| Cyclohexanone |
9.255 |
Ο |
Ο |
Ο |
| Tetrahydrofuran |
9.317 |
Ο |
Ο |
Ο |
| Trichloroethylene |
9.35 |
Ο |
Ο |
× |
| Acetone |
9.712 |
Ο |
Ο |
Ο |
| 1,2-dichloroethane |
9.910 |
Ο |
Ο |
Ο |
| Pyridine |
10.58 |
|
|
|
| Acetonitrile |
11.80 |
Ο |
Ο |
Ο |
| Ethanol |
12.9 |
Ο |
Ο |
Ο |
| DMSO |
13.0 |
|
|
|
| Methanol |
14.5 |
|
|
|
| Ethylene glycol |
14.5 |
|
|
|
|
NOTE  : fully dissolved Ο: almost
dissolved Δ: swollen (absorbs liquid) ¡ß: virtually not absorbing liquid
 GOHSEFIMER LW exhibits dissolubility or liquid absorbing properties with solvents
(SP value range of 23.4 to 8.5) such as methanol, ethanol, acetone, ethylene glycol
and DMSO. |
|
|
|
Tg of GOHSEFIMER LW |
| |
| 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 |
- |
| LW-300 |
56.3 |
1.6 |
-12.9 |
- |
| LL-02 |
47.3 |
42.9 |
NA |
- |
|
| NOTE |
1) |
Measuring conditions: Measurement
with DSC (temperature increase/decrease rate: 10 degree C/min) |
| |
2) |
LL-02 is an unmodified low saponification PVOH
(polymerization degree: approx. 250) |
|
|
|
|
Effluent Water Loads of GOHSEFIMER LW |
| |
| Product
Grade |
COD
(mg/kg)×104 |
BOD5
(mg/kg)×102 |
|
| LW-100 |
80 |
110 |
| LW-300 |
77 |
180 |
| GOHSENOL (generic PVOH) |
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 |
|
|
|
|
Low Saponification PVOH
