Based on these unique characteristics Nichigo G-Polymer™ has the following fundamental properties.

Excellent water solubility
Swelling & Bridging
Compostable & Biodegradable
High gas barrier
Extrudable
Dispersion properties

Design

General Grades

Powder Type

TypeGradeViscosity *1
(mPa.s)
Estimated Polymerization
Degree
Saponification Degree (mol%)Melting Point *2
(Degree C)
Fully HydrolysedAZF8035W3.0300Min98.0172
AZF8035Q*33.0300Min98.0172
OKS-10113.0300Min98.0206
OKS-8118*33.0300Min99.0224
OKS-80773.3330Min99.0190
BVE8049Q*34.5450Min99.0190
OKS-100915.01,200Min99.0190
Partially HydrolysedOKS-80964.545093.0168
AYB8041W3.030089.0180
OKS-80894.045086.0159
Above numbers are for reference, not guaranteed.
*1: Viscosity of 4% aqueous solution at 20 deg C
*2: Measured with DSC, both heating and cooling speeds of 10 deg C/min
*3: High purified type (for food packaging application)

Pellet Type

 Application
TypeGradeMFR*1
(g/10min)
OTR*2
(cc 30mm/m2.day.atm)
FilmInjectionSpinning
StandardBVE8049P*34.3Min99.0XX
High MFROKS-8077P*330Min99.0XX
FlexibilityOKS-8074P*33.5Min99.0XX
High FlexibilityOKS-8095P*32.5Min99.0XX
Easily DissolvingOKS-8042P2389.0XX
Heat ResistanceOKS-8211P25Min98.0X
Above numbers are for reference, not guaranteed.
*1: Measured with Melt Indexer (210 deg C, 2160g) (200 deg C for OKS-8042P, 230 deg C for OKS-8211P
*2: Measured at 23 deg C / 65%RH
*3: High purified type (for food packaging application)

Oil & Gas Application Grades

Powder Type

TypeGradeParticle Size (D50)
(ųm)
Target Well Temperature
(Degree F)
StandardOKS-8139~700< 160
High SolubleOKS-1265~1,000< 120
Ultra-high SolubleOKS-1267~1,000< 70
Above numbers are for reference, not guaranteed.

Pellet Type

TypeGradeParticle Size
(mm)
Target Well Temperature
(Degree F)
StandardOKS-8201P3.0 x 2.5< 160
High SolubleOKS-8196P3.0 x 2.5< 120
Ultra-high SolubleBVE8049P3.0 x 2.5< 70
Above numbers are for reference, not guaranteed.

G-Polymer Powder Type
The numbers above are sample values, not guaranteed values.
*1 : 4% aqueous solution at 20oC | *2 : Measured by DSC

Pellet Type
*1 : Measured by DSC  
*2 : 2160 gm 210 oC (OKS-8042P:190oC)
*3 : 20oC 65%RH
The numbers above are sample values, not guaranteed values.

Properties

Water Solubility (Comparison with Conventional PVOH)

Nichigo G-Polymer™ shows excellent water solubility even at low temperature

[Test conditions]
After mixing Nichigo G-Polymer™ in agitated water and heating to dissolve it.
Temperature: Raise from 20 degree C to 85 degree C (1 degree C/min)
Concentration: 10%

  Solubility Temp/Time
Grade 20°C/2hr 70°C/1hr 90°C/1hr
Nichigo G-Polymer™ AZF8035W Disolve Disolve Disolve
Nichigo G-Polymer™ OKS-1011 Partially Disolve Disolve Disolve
Fully saponified PVOH Partially Disolve Partially Disolve Disolve

[Test conditions]
After mixing Nichigo G-Polymer™ in agitated water and heating it to the
temperature that it dissolves, mixing for a fixed amount of time and cooling, check the state of dissolution.
Test concentration: 5%

Water Solubility for Diverting Agent Application (Comparison with PLA)
Nichigo G-Polymer™ shows excellent water solubility even at low temperature.

[Test conditions]
Sample
* G-Polymer: Blend of powder and pellet

* PLA: Blend of powder and pellet

1g sample / 100g RT tap water
Plugging process: Stir at medium speed for 1 hour @ RT
Dissolution process: Hold at 122/140 degree F in dryer (1, 3days, 1, 2 weeks)

Bridging Mechanism of Nichigo G - Polymer™

Bridging Properties on Slit
Nichigo G-Polymer™ shows excellent bridging property on small slit.

[Test conditions]

Slot tester
60g polymer/5g guar/1L tap water were stirred at RT for 60 minutes
Slurry was injected into tester (slot size: 0.072/0.025 inch), then pressurized 200 psi
Measure effluent thru slot, less the better

Compostability

Nichigo G-Polymer™ BVE8049P, OKS-8077P, OKS-8095P and BTR8002P are confirmed by US and EU standard (EN13432 and EN14851).

Biodegradability

[Test conditions]
Conducted based on the method described in JIS K6950.
Equipment: closed oxygen consumption measurement device
(Ohkura Electric Co., Ltd. OM3100A Coulometer)
Microorganism concentration and source: 90 mg/l return sludge from our company factory
Amount of sample added: 600μl
Standard testing culture fluid: 300 ml
Temperature: 25 ± 1 degree C
Test period: 70 days

Hydrogen Gas Barrier Performance
  OTR
Sample cc 20μm/m2 day atm Normalized with Nichigo G-Polymer™
Nichigo G-Polymer™ BVE8049Q 0.0023 1
Fully saponified PVOH 0.005 2
EVOH 29mol% 0.07 30
EVOH 44mol% 1.3 600
Nylon 6 76 35,000
Polypropylene 3,900 1,700,000

Sample : solution coating film (Single layer film is used for Nylon 6 and Polypropylene)
Measurement conditions: 20 degree C, dry

Nichigo G-Polymer™ shows excellent barrier performance under lower humidity conditions

Apparatus : OXTRAN2/20
Sample : PP/tie/Nichigo G-Polymer™ BVE8049P or EVOH/tie/PP multilayer film
Condition : 23 degree

Hydrogen Gas Barrier Performance

Sample cc 20μm/m2 day atm
Nichigo G-Polymer™ BVE8049Q <3
EVOH 29mol% 26
EVOH 44mol% 440
Nylon 6 900
Nylon 11 5,600

Sample: single layer film
Measurement conditions: dry
Nichigo G-Polymer™, EVOH: 41 degree C
Nylon resin: room temperature

Carbon Dioxide Gas Barrier Performance

Samples cc 20μm/m2 day atm Normalized with Nichigo G-Polymer™
Nichigo G-Polymer™ BVE8049Q 0.0058 1
Fully saponified PVOH 0.0068 1.2
EVOH 32mol% 1.3 224

Sample: biaxial stretched film
Measurement conditions: 20 degree C, dry

Nichigo G-Polymer™ is a resin that can be extruded.
Compared to PVOH, Nichigo G-Polymer™ has a low melting point and a high thermal decomposition temperature, giving it outstanding extrusion performance.

Applicable Extrusion Methods

        Application
Type Grade MFR
(g/10min)
OTR
(cc 30mm/m 2.day.atm)
Film Injection Spinning
Standard BVE8049P*3 4.3 Min99.0 X X
High MFR OKS-8077P*3 30 Min99.0 X X
Flexibility OKS-8074P*3 3.5 Min99.0 X X
High Flexibility OKS-8095P*3 2.5 93.0 X X
Easily Dissolving OKS-8042P 23 89.0 X X
Heat Resistance OKS-8211P 25 Min98.0 X
Above numbers are for reference, not guaranteed.
*1 Measured with Melt Indexer (210 deg C, 2160g) (200 deg C for OKS-8042P, 230 deg C for OKS-8211P)
*2 Measured at 23 deg C / 65%RH
*3 High purified type (for food packaging applicatio

By small amounts added, Nichigo G-Polymer™ exhibits good dispersion with silica, alumina and other hydrophilic inorganic compounds.
By small amounts added, it even has good dispersion with colloidal silica, forming films with outstanding transparency and luster.

[Film producing conditions]Anionic colloidal silica/resin=90/10wt%
Disperse mixed anionic colloidal silica / resin solution with homogenizer (5,000 rpm for 5 min)
After coating PET film using a bar coater, dry at 105 degree C for 5 min

Processing & Handling

Storage

Since this is a fine powder, use rubber gloves, dust masks, protective eyewear and other protective gear when handling it in order to protect skin and eyes

When handling large amounts of it, install dust collection equipment. In addition, since there is a danger of dust explosions occurring from ignition caused by static electricity sparks, use grounding equipment and conductive dust filtration cloth and take other countermeasures.

Store in a place where it will not be dampened by rain, for example, because it could dissolve. Moreover, because it can easily harden into blocks if it absorbs moisture, avoid storing it in hot and humid conditions.

Dissolving

Add to room temperature water as you stir it and mix it thoroughly. Raise the temperature as you stir it to 80-90°C and dissolve it for 30-60 minutes

The formation of undissolved powder can result in unstable solution. In order to prevent the occurrence of undissolved lumps when adding the polymer, observe the following precautions.

  • Use room-temperature water. (Do not use warm water.)
  • Stir thoroughly as you add the polymer gradually.

Molding

We provide a casting grade of Nichigo G-Polymer™ that has water content of less than 0.5 wt%, in a moisture-resistant package, so there is no need to pre-dry it before casting.

Nichigo G-Polymer™ is an absorbent resin. If its package is left open for a long period of time, it could absorb moisture and this could result in foaming at the time of casting. Use heat-sealing to hermetically seal the package for storage.

We do not recommend redrying, because it could cause yellowing, F.E., etc.

To the greatest extent possible, avoid leaving Nichigo G-Polymer™ in processing equipment.
Doing so could result in foaming and gelification. When stopping processing, purge it with LDPE or LLDPE. Consider approximately 20 minutes to be the maximum amount of time that it should be left in equipment.

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