Hycat™ AO-4 is a clear and colorless catalyst used to accelerate the reaction of epoxy resins with various anhydrides including MTHPA, MHHPA, NMA, PA and more.

A common problem with epoxy formulations is the tendency for the cured polymer to discolor when subjected to elevated temperatures or UV exposure. Color corruption will impair the application where light transmission is critical such as in Light-Emitting Diode (LED) or Fiber Optic Devices. Significant research has been spent in developing epoxy formulations where maximum light transmission and color stability are the desired goals. As a part of this research, considerable effort has also been dedicated to improve the efficiency of the catalysts used in these epoxy formulations.

Because amines, quaternary ammonium salts, and imidazoles have the tendency to form color, other catalysts systems are preferred. Ideally, a catalyst that can be used in low concentration, does not contribute to color formation, provides a quick gel or cure time at moderate temperatures and shows latency would be desirable for this application. Hycat™ AO-4 achieves these goals of clear, colorless and quick cures when reacting anhydrides with diglycidyl ether of bisphenol A, diglycidyl ether bisphenol F and cycloaliphatic diepoxides. Other epoxides are expected to behave favorably in similar formulations.

Hycat™ AO-4 is a liquid so it is easy to handle, easy to load, easy to adjust and can be readily cleaned up with typical organic solvents or degreasers. Because it is a liquid, loading can be easily tailored to meet desired cure temperatures, cure cycles, pot life, glass transition temperature and other mechanical properties.  By using compounds with monomeric, dimeric or poly functional groups, the degree of cross-linking and therefore the mechanical properties of the resulting product can be advantageously modified.  Hycat™ AO-4 will also work in the presence of a number of popular toughening agents and polymer additives.

Typical catalyst loadings range from 1 to 5 phr (parts per hundred resin) however higher or lower concentrations can be used depending on the formulation and desired end result.

Hycat™ AO-4 is REACH and RoHS compliant and manufactured under ISO 9002 quality assurance control standards. Free 60g (60mL) evaluation samples are available via our sample request page or send email to This email address is being protected from spambots. You need JavaScript enabled to view it.

Typical Physical Properties                                                    Available Quantities

Physical State

Liquid

 

Packaging (HDPE All)

Net Wt

Appearance (color)

Emerald Green

 

200L Drums

200 Kgs (440 Lbs)

Viscosity (cP)

< 100 @ 25o C

 

50L   Drums

50 Kgs   (110 Lbs)

Density

1.0 @ 25o C

 

20L   Jerricans

20 Kgs   (44 Lbs)

Shelf Life

Indefinite

 

4L     Bottles

4 Kgs     (8.8 Lbs)

 

 

Recommended Uses:

Hycat™ AO-4 is recommended for use in epoxy/anhydride formulations where absence of color and polymer clarity are constraints.  Most epoxy resins, including Aliphatic, Cycloaliphatic, Phenol-Type Di-and Tri-Glycidyl Ethers, Novolacs and many other epoxy resins will benefit using Hycat™ AO-4.

 

Bisphenol A Diglycidyl Ether & Methyltetrahydrophthalic Anhydride

TABLE AO-1

Resin System

phr

DSC Analysis 25oC – 250oC @ 10oC/min

Time to 100k cP (3)

Onset oC

Peak oC

Endset oC

Energy J/g

Tg oC (4)

80oC (min)

25oC (hrs)

BADGE (1)

MTHPA (2)

Hycat™ AO-4

100:86:4

128

161

189

321

130

151

>48

(1) Bisphenol A Diglycidyl Ether, Epon 828 (Momentive Specialty Chemicals)

(2) Methyltetrahyrdophthalic Anhydride, Lindride 2 (Lindau Chemicals)

(3) 15g mass by Brookfield LVDV-II & Thermosel module; Time to 100,000 cP reported at set temperature

(4) 15g mass cured 2hrs @ 100oC + 2hrs @ 150oC; final thickness 5.5mm; Double DSC scan,

      50oC-200oC @ 10oC/min; Midpoint Method; *Note: Higher Tg’s can be realized with formula and cure optimization

(5) ND – No data, test not performed

 

GRAPH AO-1

 

 

GRAPH AO-2

 

GRAPH AO-3

 

GRAPH AO-4

 

GRAPH AO-5

 

Bisphenol A Diglycidyl Ether & Methylhexahydrophthalic Anhydride

 

TABLE AO-2

Resin System

phr

DSC Analysis 25oC – 250oC @ 10oC/min

Time to 100k cP (3)

Onset oC

Peak oC

Endset oC

Energy J/g

Tg oC (4)

25oC (hrs)

80oC (min)

BADGE (1)

MHHPA (2)

Hycat™ AO-4

100:89:4

123

163

189

389

139

>48

42

 

(1) Bisphenol A Diglycidyl Ether, Epon 828 (Momentive Specialty Chemicals)

(2) Methylhexahyrdophthalic Anhydride, Lindride 52D (Lindau Chemicals)

(3) 15g mass by Brookfield LVDV-II & Thermosel module; Time to 100,000 cP reported at set temperature

(4) 15g mass cured 2hrs @ 100oC + 2hrs @ 150oC; final thickness 5.5mm; Double DSC scan,

      50oC-200oC @ 10oC/min; Midpoint Method; *Note: Higher Tg’s can be realized with formula and cure optimization

(5) ND – No data, test not performed

 

GRAPH AO-6

 

GRAPH AO-7

 

GRAPH AO-8

 

GRAPH AO-9


Cycloaliphatic Epoxide & Methyltetrahydrophthalic Anhydride

TABLE AO-3

Resin System

phr

DSC Analysis 25oC – 250oC @ 10oC/min

Time to 100k cP (3)

Onset oC

Peak oC

Endset oC

Energy J/g

Tg oC (4)

80oC (min)

25oC (hrs)

Cycloaliphatic (1)

MTHPA (2)

Hycat™ AO-4

100:116:4

120

165

191

386

152

>48

>100

 

(1) Cycloaliphatic Epoxide, Lindoxy 190 (Lindau Chemicals)

(2) Methyltetrahyrdophthalic Anhydride, Lindride 2 (Lindau Chemicals)

(3) 15g mass by Brookfield LVDV-II & Thermosel module; Time to 100,000 cP reported at set temperature

(4) 15g mass cured 2hrs @ 100oC + 2hrs @ 150oC; final thickness 5.5mm; Double DSC scan,

      50oC-200oC @ 10oC/min; Midpoint Method; *Note: Higher Tg’s can be realized with formula and cure optimization

(5) ND – No data, test not performed

GRAPH AO-10

 

GRAPH AO-11

 

 

 

 

GRAPH AO-12

 

GRAPH AO-13

 

Cycloaliphatic Epoxide & Methylhexahydrophthalic Anhydride

 

TABLE AO-4

Resin System

phr

DSC Analysis 25oC – 250oC @ 10oC/min

Time to 100k cP (3)

Onset oC

Peak oC

Endset oC

Energy J/g

Tg oC (4)

25oC (hrs)

80oC (min)

Cycloaliphatic (1)

MHHPA (2)

Hycat™ AO-4

100:120:4

123

163

189

389

144

>48

100

(1) Cycloaliphatic Epoxide, Lindoxy 190 (Lindau Chemicals)

(2) Methylhexahyrdophthalic Anhydride, Lindride 52D (Lindau Chemicals)

(3) 15g mass by Brookfield LVDV-II & Thermosel module; Time to 100,000 cP reported at set temperature

(4) 15g mass cured 2hrs @ 100oC + 2hrs @ 150oC; final thickness 5.5mm; Double DSC scan,

      50oC-200oC @ 10oC/min; Midpoint Method; *Note: Higher Tg’s can be realized with formula and cure optimization

(5) ND – No data, test not performed

 

GRAPH AO-14

 

GRAPH AO-15

 

GRAPH AO-16

 


GRAPH AO-17

 

GRAPH AO-18

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