TECHNICAL FIELD
[Cross-reference to Related Applications]
[0001] The present application claims the benefit of priority
based on Korean Patent Application No. 10-2020-0158966, filed
10 on November 24, 2020, the entire contents of which are
incorporated herein by reference.
[Technical Field]
[0002] The present invention relates to a plasticizer
composition including isophthalate derived from a mixture
15 alcohol of hexyl alcohol isomers and di(2-ethylhexyl)
terephthalate, and a resin composition comprising the same.
BACKGROUND ART
[0003] Generally, plasticizers are obtained through the
reaction of alcohols with polycarboxylic acids such as phthalic
20 acid and adipic acid to form corresponding esters. In addition,
considering the internal and external regulations on harmful
phthalate-based plasticizers to the human body, studies are
being continued on plasticizer compositions which may replace
phthalate-based plasticizers such as terephthalate-based,
25 adipate-based and other polymer-based plasticizers.
2
[0004] Meanwhile, regardless of the type of industry
including plastisol type of industry of flooring materials,
wallpaper, soft and hard sheets, etc., calendaring type of
industry, or extrusion/injection compound type of industry,
5 the demand for eco-friendly products is increasing. In order
to reinforce the quality properties, processability and
productivity according to the finished products, an
appropriate plasticizer is required considering discoloration,
migration, mechanical properties, etc.
10 [0005] According to the properties required by the types of
industry in various areas of usage, such as tensile strength,
elongation rate, light resistance, migration, gelling
properties and absorption rate, supplementary materials such
as a plasticizer, a filler, a stabilizer, a viscosity
15 decreasing agent, a dispersant, a defoaming agent and a foaming
agent are mixed with a PVC resin.
[0006] For example, in case of applying di(2-ethylhexyl)
terephthalate (DEHTP) which is relatively cheap and widely
used among plasticizer compositions which may be applied to
20 PVC, hardness or sol viscosity is high, absorption rate of a
plasticizer is relatively slow, and migration and stress
migration are not good.
[0007] As improvements on the above limitations, the
application of a transesterification product with butanol as
25 a plasticizer, may be considered as a composition including
3
DEHTP. However, in this case, plasticization efficiency is
improved, but volatile loss or thermal stability is inferior
and mechanical properties are somewhat degraded, and the
improvement of physical properties is required, and
5 accordingly, there is no solution but employing a method
compensating the defects through mixing with a second
plasticizer at the present time.

CLAIMS
1. A plasticizer composition comprising dihexyl
isophthalate and di(2-ethylhexyl) terephthalate, wherein
5 a hexyl group of the dihexyl isophthalate is derived from
an isomer mixture of hexyl alcohol, and
the isomer mixture of hexyl alcohol comprises two or more
selected from the group consisting of 1-hexanol, 1-
methylpentanol, 2-methylpentanol, 3-methylpentanol, 4-
10 methylpentanol, 1,1-dimethylbutanol, 1,2-dimethylbutanol,
1,3-dimethylbutanol, 2,2-dimethylbutanol, 2,3-dimethylbutanol,
3,3-dimethylbutanol, 1-ethylbutanol, 2-ethylbutanol, 3-
ethylbutanol and cyclopentyl methanol.
15 2. The plasticizer composition according to claim 1, wherein
the isomer mixture of hexyl alcohol comprises 1-hexanol and 2-
methylpentanol.
3. The plasticizer composition according to claim 1, wherein
20 the isomer mixture of hexyl alcohol comprises 40 parts by
weight or more of a branch type alcohol based on 100 parts by
weight of the isomer mixture.
4. The plasticizer composition according to claim 1, wherein
25 the isomer mixture of hexyl alcohol comprises 50 to 95 parts
44
by weight of a branch type alcohol based on 100 parts by weight
of the isomer mixture.
5. The plasticizer composition according to claim 1, wherein
5 the isomer mixture of hexyl alcohol comprises 40 parts by
weight or less of 1-hexanol based on 100 parts by weight of
the isomer mixture.

CLAIMS
1. A plasticizer composition comprising dihexyl
isophthalate and di(2-ethylhexyl) terephthalate, wherein
5 a hexyl group of the dihexyl isophthalate is derived from
an isomer mixture of hexyl alcohol, and
the isomer mixture of hexyl alcohol comprises two or more
selected from the group consisting of 1-hexanol, 1-
methylpentanol, 2-methylpentanol, 3-methylpentanol, 4-
10 methylpentanol, 1,1-dimethylbutanol, 1,2-dimethylbutanol,
1,3-dimethylbutanol, 2,2-dimethylbutanol, 2,3-dimethylbutanol,
3,3-dimethylbutanol, 1-ethylbutanol, 2-ethylbutanol, 3-
ethylbutanol and cyclopentyl methanol.
15 2. The plasticizer composition according to claim 1, wherein
the isomer mixture of hexyl alcohol comprises 1-hexanol and 2-
methylpentanol.
3. The plasticizer composition according to claim 1, wherein
20 the isomer mixture of hexyl alcohol comprises 40 parts by
weight or more of a branch type alcohol based on 100 parts by
weight of the isomer mixture.
4. The plasticizer composition according to claim 1, wherein
25 the isomer mixture of hexyl alcohol comprises 50 to 95 parts
44
by weight of a branch type alcohol based on 100 parts by weight
of the isomer mixture.
5. The plasticizer composition according to claim 1, wherein
5 the isomer mixture of hexyl alcohol comprises 40 parts by
weight or less of 1-hexanol based on 100 parts by weight of
the isomer mixture.
6. The plasticizer composition according to claim 1, wherein
10 a weight ratio of the dihexyl isophthalate and the di(2-
ethylhexyl) terephthalate is 90:10 to 10:90.
7. The plasticizer composition according to claim 1, wherein
the isomer mixture of hexyl alcohol comprises 1-hexanol, 2-
15 methylpentanol and 3-methylpentanol.
8. A resin composition comprising: 100 parts by weight of a
resin; and 5 to 150 parts by weight of the plasticizer
composition of claim 1.
20
9. The resin composition according to claim 8, wherein the
resin is one or more selected from the group consisting of a
straight vinyl chloride polymer, a paste vinyl chloride polymer,
an ethylene vinyl acetate copolymer, an ethylene polymer, a
25 propylene polymer, polyketone, polystyrene, polyurethane,
45
polylactic acid, natural rubber, and synthetic rubber.