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Specialty Grades

Anionic PVOH T Series

GOHSENX™ T Series

An anionic specialty modified PVOH having a carboxyl group on its side chain.
As a coating agent (especially for paper), adhesive, and binder, GOHSENX™ T has earned a great reputation globally as well as domestically for its excellent solubility, bonding power, and reactivity of the carboxyl group.

Structural formula

Structural formula T series

Properties
  • ・Its aqueous solution behaves as a polymer electrolyte.
  • ・Excellent solubility in water compared with ordinary PVOH.
  • ・Its aqueous solution is excellent in viscosity stability, and less prone to abnormalities in fluidity under high shear speed; therefore, high speed coating is possible.
  • ・Excellent solubility in aqueous alkali solutions.
  • ・Features good compatibility with water-soluble polymers such as starch.
  • ・Forms a chelate with a metal ion (in particular, aluminum ion) to cross-link and insolubilize the metal ion.
  • ・Greatly improves the surface and Z-axis strength of paper when coated.
  • ・Features much better barrier properties than ordinary PVOH.

Solubility Chart for GOHSENX T-330H by Amylograph

Fluidity under High Shear Speed

Compatibility with Starch

Technical Specifications
Grade Viscosity
(mPa・s)※1
Saponification Degree
(mol %)
pH
※2
Applications
T-330H
27.0~32.0
99.0 or higher
6.0~8.0
Printing stock, Coat paper, NCR paper, Release paper, Emulsifier(VAc-Em), Cement mortar agent, Film, Drilling fruid control agent
T-330
27.0~33.0
95.0~98.0
6.5~7.5
T-350
27.0~33.0
93.0~95.0
6.5~7.5

※1,※2: 20℃, 4% aqueos solution

Crosslink with Polyamide Epichlohydrin
Product
Amount of
Cross-linker
(%)
Film Drying Conditions
Elution Rate
(%)
GOHSENX™
T-330
0 23℃× blow-drying
70℃×2min.
70℃×10min.
100
100
100
5 23℃× blow-drying
70℃×2min.
70℃×10min.
100
100
64
10 23℃× blow-drying
70℃×2min.
70℃×10min.
71
59
42

Elution rate: After soaking film in 70℃ water for 1 hr
Cross-linker: WS-570 (Solid: 12.5%)   manufactured by Seiko PMC
Amount of cross-linker: Active substance/PVOH

Biodegradability
Product
Biodegradability
(%)
GOHSENOL™ GH-17 67
GOHSENX™ T-330 45

Biodegradability test:
comply with “Determination of the ultimate aerobic biodegradability of plastic materials in an aqueous medium-method by measuring the oxygen demand in a closed respirometer”(JIS K6950:ISO14851:1999)
Test conditions:
Specimen conc.: 100mg/lx, Application conc.: 90mg/l Standard test medium: 300ml,
Test temp.: 25±1℃, Test duration: 28days
Active Sludge: Sludge returned from Mizushima Plant, Nippon Gohsei

Applications:
The possible applications of GOHSENX™ T include:

Paper treatment agents
Improves surface and Z-axis strength as well as printability, and prevents vessel pick.
A partially saponified type is effective for improving barrier properties; therefore, used as an undercoating agent for silicon release paper.
Plywood adhesives
Improves initial bonding strength
Cement mortar agents
Excellent stability under alkalinity conditions

Paper TreatmentPlywood AdhesiveMortar Additive

Paper Coating Properties of GOHSENX™ T
Product IGT Pick
Strength
(cm/sec)
Z-axis
Strength
(kg/cm)
Permeability
(sec)
Oil
Absorptiveness
(sec)
GOHSENX™ T-330H 95 2.5 10 12
GOHSENX™ T-330 90 2.3 13 20
GOHSENX™ T-350 85 2.2 35 80
GOHSENOL™ N-300 65 1.7 8 10
Oxidized starch 50 1.3 8 8

Base stock: L-BKP 100%, basis weight 66g/m2  Size press: 90m/min line pressure 11kg/cm
Drying: 150℃×3min  Coating weight: 1g/m2

Dissolution

Dissolving GOHSENX™ T
Put GOHSENOL™ into water at room temperature while agitating it. After it disperses evenly, heat the solution and keep it at 80 to 90℃ for 30 to 60 minutes under continued agitation until complete dissolution.
Effluent Water Loads of GOHSENX™ T
Polymer COD(mg/kg) ×104 BOD5(mg/kg)×102
GOHSENX™ T-330 99 83
GOHSENOL™ 60~100 50~100
Corn Starch 36 7,400

Measuring conditions: Sample conc. mean pure material conc.
COD was measured by potassium permanganate method (JIS K 0102), and BOD5 is a 5-day BOD value.
Measurement: Registration No. of measurement certification enterprise, Osaka No. 10013, KK Osaka Environmental Technology Center.



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