Page 152 - Engineering Plastics Handbook

Acrylonitrile-Butadiene-Styrene (ABS) Resin 125

suitable alternative. According to development of the use under various
regulations and consumer protection laws and further development of
various grades of the products by transparent ABS makers, it is anticipated
that the transparent ABS market will be continuously expanded for the
next few years.

Heat-Resistant ABS
The heat-resistant polymer generally is also called a high heat tem-
perature polymer or a thermally stable polymer, and it means the engi-
neering plastic that can be processed or applied at high temperature.
See Fig. 6.10.
As one of such heat-resistant polymers, heat-resistant ABS is a plastic
having excellent processability and mechanical properties, and it is the
product that can particularly be applied to the field requiring high heat
resistance among the applications where coloring properties and gloss are
demanded. As the major use, it is broadly applied to electric and elec-
tronic products and daily miscellaneous goods; further, it can be extensively
applied to the interior and exterior materials of automobiles.
Although the heat-resistant ABS generally includes high heat grades
having a heat resistance of 90 to 95°C and very high heat grades having
a heat resistance of 100 to 105°C, heat-resistant ABS product having a heat
resistance of 110 to 115°C has been commercialized for the special appli-
cation requiring a superhigh heat resistance.
Contrary to the general-purpose ABS comprised of grafted ABS and
styrene-co-acrylonitrile blend, heat-resistant ABS constitutes the final
products by blending various kinds of styrenic matrix for providing heat
resistance properties, that is, α-methyl styrene-co-acrylonitrile, α-methyl

Rubber component
Graft AS resins
AS resins

Graft ABS powder Heat-resistant
matrix resins

Heat-resistant ABS resins
Figure 6.10 Composition of heat-resistant ABS.