Saturated polyester resin <ESPEL>
 - ESPEL9940 series are high molecular weight saturated polyester resins developed for PET film adhesives.
Linear or branched saturated polyester resins are available with variable Tg and molecular weight.
Features
- The PET-like composition offers excellent adhesion to PET films.
Characteristics
| Polyester resins |
ESPEL 9940A |
ESPEL 9940B |
ESPEL 9940 C-37 |
ESPEL 9940D |
ESPEL 9940 E-37 |
| Items |
| Non volatile content |
% |
40.5 |
40.4 |
37.8 |
50.2 |
37.5 |
| Viscosity |
GN |
Y− |
W−Y |
F− |
U+ |
E− |
| Acid value |
− |
1 or less |
1 or less |
1.8 |
2.3 |
2.9 |
| Hydroxyl value*1 |
Solid equivalent |
5−10 |
5−10 |
10−20 |
10−20 |
15−25 |
| Color |
GN |
1or less |
1−2 |
3 |
2−3 |
2 |
| Resin Tg |
Designed value, °C |
10 |
25 |
10 |
25 |
25 |
| Measured value, °C |
− |
− |
− |
− |
27 |
| Resin type |
− |
Linear |
Linear |
Branched |
Branched |
Branched |
| Molecular weight *2 |
Mw
Mn
Mw/Mn |
56,000
19,000
2.9 |
50,000
18,000
2.8 |
24,000
10,000
2.4 |
27,000
11,000
2.5 |
32,000
10,000
3.2 |
| Solvent composition |
Weight ratio |
Toluene/methyl ethyl ketone=80/20 |
- *1 Hydroxyl value: Designed value, solid equivalent
- *2 Molecular weight: GPC measurement, standard polystyrene equivalent
 |