A Characteristic of Dendrimer-acrylate
Y. Saruwatari
Osaka Organic Chemical Industry LTD., Katayama-Cho, Kashiwara City, Osaka, Japan
Abstract-- We established composition of Dendrimer-acrylate. We examined behavior of the ultraviolet rays hardening.
In comparison with the general acrylic monomer, the increase of the cure rate, the decrease of the oxygen obstruction,decrease of the hardening shrinkage were confirmed. In addition, the provided film understood that I was superior in
hardness and the softness.

I. INTRODUCTION
The development of acrylic materials developed withestablishment of the ultraviolet rays hardening rapidly
from about 1970. The ultraviolet rays hardening is thetechnology that is important in electronic materials now.
Application of the ultraviolet rays hardening is coating,the adhesion, sealing, and patterning. The ultraviolet rays
hardening system by acrylic materials has good and bad
points to show as follows.
good points

bad points

Hardening is fast

Shrinkage is highFilm is transparent

Oxygen obstruction

Cost is low

Weather ability is low

FIGURE.2
Dendrimer-acrylate 「STAR-501」
III. A RESULT OF UV-HARDENING OF STAR-501
In comparison with the linear polymer with molecularweight at the same level, it was confirmed that STAR501 had low viscosity.

etc

TABLE 1.
Good and bad points of UV Hardening.
Dendrimer-acrylate is the superior acrylic oligomer
which can solve these bad points.
II. COMPOSITION OF DENDRIMER-ACRYLATE
V#1000 ： We composed dendrimer of the polyol
which assumed a hydroxyl group a branch molecule. I
made a hydroxyl group of the polyol ester with acrylicacid and composed dendrimer-acrylate.

FIGURE.1
Dendrimer-acrylate 「V#1000」
STAR-501： We let you accumulate DPHA(dipenthaerythiritol hexaacrylate) with a thiolmaterial spherically and composed dendrimer-acrylate.

FIGURE 3.
Comparison of the viscosity behavior.
I combined a UVstart-agent with STAR-501
and DPHA, each and made the film of the same film
thickness and exposed it and compared the disappearance
speed of the double bond.
As a result, STAR-501 compared it with DPHA, andthe increase of the cure rate was confirmed.

FIGURE 4.
The comparison of the cure rate.
With the point same as the measurement of the curerate, I lowered the thickness of the application film andmeasured the exposure energy that was necessary forhardening. As a result, STAR-501 compared it withDPHA, and that even a thin film stiffened by little energy
was confirmed. I understood that STAR-501 had little
oxygen obstructions

FIGURE 6.
The comparison of hardening shrinkage.

IV.CONCLUSIONS
Dendrimer-acrylate makes up for low hardening
shrinkage, hardness and coexistence of the flexibility bad
point of the conventional acrylic monomer.

REFERENCES[1]

FIGURE 5.
The comparison of oxygen obstructions.
We performed the same film thickness, the pencil
hardness (JIS) in the same polymerism degree and anadhesive examination (JIS). As a result, as for STAR-501,
high coherency was identified as the hardness that was
higher than DPHA.
Opticscharacteristic
Filmcharacteristic

ReflectanceTransmittance
Haze
Pencil Hardness
AdhesiveCurl
Steel wool Wonud(200g)

DPHA
5.9
900.8
2H
40/100NGNGSTAR-501
6.0
890.8
3H
99/100OKOK

TABLE 2.
The pencil hardness and adhesive.
In V#1000 and STAR-501, I measured the volume
shrinkage by the hardening. I made the volume shrinkage
and the graph of the double bond chemical equivalent ascomparison contrast in many sensuality monomer, twosensuality monomers, a single sensuality monomer (amolecular weight difference).
dendrimer-acrylate has a smaller hardening shrinkage
than a normal acrylic monomer.

WO2,008/047620