Multifunctional propyleneimines-new generation of crosslinkers for ...

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ARTICLE IN PRESS
Z. Czech / International Journal of Adhesion & Adhesives 24 (2004) 503–511
3.6. Potlife of pressure-sensitive adhesives containing
multifunctional propylene-imines
It was also followed up the shell life of investigated
PSA crosslinked with the best crosslinker propyleneimine
Permutex XR-2500 with 0.1, 0.2 and 0.3 wt%
(Fig. 36).
As can be seen in Fig. 36 the PSAs are general only
processable in the time area between 5 and 7 h. The
potential risk of gelation is quite difficult to convert
propyleneimine containing adhesives.
adhesion (N)
16
12
8
4
0
BPAD
MAPO
TAPS
0.1 0.2 0.3 0.4 0.5
propyleneimine amount (wt.%)
Fig. 34. Adhesion dependence of propyleneimine content.
4. Conclusions
Fromthe evaluaction of the experiments discussed in
this article, it can be concluded that:
* Fromthe reaction products between multifunctional
carboxylic acid chlorides and propyleneimine
Table 2
Important properties of crosslinked PSA
Cros.-conc. (wt%) Tack (N) Adhesion (N) Cohesion (N)
20 C 70 C 20 C 70 C
Permutex XR-2500
0.1 24.0 19.5 13.5 90 30
0.2 21.5 17.0 10.5 >90 40
0.3 18.5 14.5 8.0 >90 40
Trazidin VN
0.1 23.5 18.0 12.0 90 30
0.2 18.5 16.0 10.0 >90 40
0.3 16.5 14.5 7.5 >90 40
Neocryl CX-100
0.1 20.0 24.0 18.0 90 20
0.2 17.0 18.0 9.0 >90 35
0.3 15.0 16.0 6.5 >90 40
cohesion (N) (20 ° C and 70 ° C)
120
100
80
60
40
20
20 ° C
70 ° C
TAPS
MAPO
BPAD
TAPS
MAPO
BPAD
viscosity (Pas)
20
15
10
5
0.3wt.%
0.2wt.%
0.1wt.%
gel
gel
max. coating viscosity
gel
0
0.1 0.2 0.3 0.4 0.5 0.6
propyleneimine amount (wt.%)
Fig. 35. Cohesion at 20 C and 70 C dependence of propyleneimine
content.
0
0 1 2 3 4 5 6 7 8 9
viscosity run (h)
Fig. 36. Potlife of PSAs containing crosslinker propyleneimine
Permutex XR-2500.
Table 1
Properties of commerciall propyleneimine crosslinkers
Properties
Propyleneimine crosslinker
Permutex XR-2500 Trazidin VN Neocryl CX-100
Chemical name
Trismethylolpropane-tris-(Nmethyl-ziridinyl)propionate
Polyfunctional propyleneimine
derivative
Polyfunctional propyleneimine
derivative
Molecular mass (Da) 467 475 470
pH 10.5 8y9 8.5y9.5
Appearance Clear, yellowish liquid Light liquid Light liquid
Viscosity 25 C (mPa s) 200 220 180
Solubility
In ethylacetate, alcohol and in aromates, limited solubility in aliphates.