|
Types of METOLOSE are divided as shown
below according to the type of substituent groups introduced to
the cellulose molecules as well as the degree of substitution and
molar substitution
Typical
degree of substitution and molar substitution for METOLOSE products
|
Type
|
SM
|
SH
|
SE
|
|
60SH
|
65SH
|
90SH
|
SEB
|
SNB
|
|
Chemical name
|
Methylcellulose
(MC)
|
Hydroxypropylmethyl
cellulose
(HPMC)
|
Hydroxyethylmethyl
cellulose
(HEMC)
|
|
Degree of substitution
|
Methoxyl group
(-OCH3)
|
1.8
|
1.9
|
1.8
|
1.4
|
1.5
|
1.5
|
|
Molar substitution
|
Hydroxypropoxyl
group
(-OCH2CHOHCH3)
|
-
|
0.25
|
0.15
|
0.20
|
-
|
-
|
|
Hydroxyethoxyl
group
(-OCH2CH2OH)
|
-
|
-
|
-
|
-
|
0.20
|
0.30
|
|
CAS number
|
9004-67-5
|
9004-65-3
|
9032-42-2
|
* Degree of substitution
The average number of methoxyl groups
attached to the anhydroglucose unit of cellulose
* Molar substitution
The average number of moles of hydroxylpropoxyl
groups or hydroxylethoxyl groups
per mole of anhydroglucose unit
of cellulose
(hi
METOLOSE)
hi METOLOSE is METOLOSE surface-treated
with a little glyoxal. This product can rapidly turn wet and disperse
without forming lumps even when added to cold water and then dissolve
by continuing agitation. An addition of alkaline ingredients to
the dispersion will speed up the dissolving process.
|