| JSR TECHNICAL REVIEW No.105 (March, 1998) |
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| Development and Industrialization of Transparent Heat-Resistant Resin,"ARTON" |
 JSR
Corporation developed a new transparent heat resistant
resin, "ARTON". A new plant was completed in 1997 at Chiba,
Japan. This article mainly describes a process design
of "ARTON". The key technologies for establishing this
process were the development of highly active polymerization
and hydrogenation catalysts, and the development of polymer
purification technology. ARTON is thermoplastic resin
which has excellent properties such as heat resistance,
optical properties and processability. Application of
this resin include optical disks, optical lens, optical
fibers, optical films, and electronic parts. |
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| Development of Optical Fiber Ribbon Materials with Novel Surface Character. |
| The
smoothness of an optical fiber ribbon surface was correlates
to the surface cure measured by the Attenuated Total Reflection
Infra-Red (ATR-IR) method. It was found that good surface
cure of coatings was realized by emproyng appropriate
photo initiator package and optimized UV dose. However,
the highly slippery surface which seemed to be necessary
for ribbon was not obtained only by optimizing these conditions.
Addition of certain compounds such as poly-dimethylsiloxane
compounds to the coatings was found to be effective to
obtain slippery character of the surface tackiness completely
Cured coatings with poly-dimethylsiloxane compounds were
analyzed by using an Electron Probe Micro Analyzer (EPMA)
and an X-ray Photoelectron Spectroscopy (XPS) to reveal
the presence of poly-dimethylsiloxane on the surface.
It was established that the selection of the poly-dimethylsiloxane
had a key role to realize the highly slippery surface
of the cured coatings. |
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| Study on Adhesion Properties of Optical Fiber Coatings. |
| Adhesion
of optical fiber coatings to glass fiber is one of the
most important properties which influences the various
performance, for example, optical attenuation or strippability
of the coatings from optical fiber, or ribbon. In this
study, it was found that the adhesion was mainly controlled
by the two factors; 1) viscoelastic properties of the
cured coatings, 2) chemical interaction between the coatings
and the glass fibers caused by the silane coupling agents.
We could design the optical fiber coatings with the various
adhesion while maintaining the similar mechanical properties.
The adhesion which were controlled by these factors exhibited
the good reliability in the long term againg test. |
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| Novel UV Curable Resin Based on Oxetane for Photofabrication |
| A
novel UV curable resin has been developed based on oxetane
chemistry and was evaluated for stereolithographic application.
The cure rate of the oxetane / epoxy hybrid resin was
found to be faster than that of cationically curable epoxy
resins and to be close to that of radically curable urethane
acrylate ones. Volume shrinkage of oxetane / epoxy hybrid
resin upon UV curing was 3.7% and was smaller than those
of the commercially available epoxy or urethane acrylate
ones. The accuracy and mechanical properties of the photofabricated
parts made of the oxetane / epoxy hybrid resin were comparable
to those made of the commercially available epoxy resin. |
|
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| High Brightness and High Transparency Color Resist. |
| We
newly developed a pigment-dispersed color resist for LCD
color filter which gives high brightness, high transparency
and good color reproducibility. And the color reproducibility
of the new color materials is superior to that of dyed
color filters. We found that the concentration of new
pigments tends to be increased than that of the conventional
pigments to obtain the same color point. So the pattern
defects of new color resist occurred because of by the
strong absorbance of the pigments and residue remained
on the substrate at the development for little alkali-soluble
polymer in the resist. We improved the resist mainly by
polymer and obtained new color resist that has no defect
and no residue. |
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| Polymerization of Butadiene with Novel tert-amino Group Initiator. |
| A
Study was made on a new initiator N, N-dimethylaminobenzyllithium
(TD-Li) for the purpose of improving functionality of
the initial chain end in anionic polymerization. After
reacting N, N-dimethyltoluidine (TD) with n-butyllithium
(BuLi), polymerization of 1, 3-butadiene was conducted
in several solvents. The "Functionality Introduction Ratio"
of polybutadiene was influenced by the polarity of the
solvents. That is, the higher the polarity, the higher
the "Functionality Introduction Ratio" On the basis of
on results of a model reaction, in high polarity solvents
the reaction between TD and BuLi advanced efficiently,
and the polymerization of butadience advanced by the benzyllithium
type initiator (TD-Li). On the other hand, in a solvent
having low polarity, because TD-Li formed partially, the
polymerization was initiated by the mixed system of TD-Li
and BuLi. Furthermore, in the case where TMEDA was added
to the reaction system, the "Functionality Introduction
Ratio" was improved. |
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| Properties of Polypropylene / Hydrogenated Styrene-Butadiene Rubber Blends |
| Polypropylene
(PP) is one of the useful general purpose plastics. However,
it is not fully accepted due to its poor transparency,
brittleness and insufficient softness. In order to improve
the above insufficient properties, we have studied new
elastomers, that is hydrogenated styrene-butadiene rubber
(HSBR), and so on. In this report, properties, miscibility,
morphology and crystallization behavior of PP / HSBR blendsare
investigated by specific volume, dynamic mechanical analysis,
differential scanning calorimetry, pulsed NMR and transmisson
electron micrographs. It is shown that PP / HSBR blends
have remarkable transparency and excellent flexibility.
HSBR is immiscible with PP at room temperature. However,
the existence of boundary layer is suggested. Micro phase-separation
structure with diameter of about 20nm is observed at PP
/ HSBR blends. And no spherulite of PP in blends is observed.
The degree of crystallinity and the type of crystal growth
in blends are almost equal to that of neat, PP, though
HSBR affects the rate of crystallization. Furthermore,
it is shown that above-mentioned properties of PP / HSBR
are derived from morphology and crystalline size of PP.
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