CYCAT® 4045 Catalyst

CYCAT® 4045 Catalyst is an amine blocked para-toluene sulfonic acid catalyst. It is recommended for accelerating the cure response of amino crosslinking resins while providing improved formulation package stability compared with the un-blocked para-toluene sulfonic acid CYCAT 4040 catalyst. It is especially recommended for use with highly alkylated amino crosslinking resins. This product provides excellent stability in high solids and waterborne systems, and in the latter it can be added without causing binder precipitation, which can often occur due to a drop in pH.

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Technical data sheet (TDS)
Product brochure
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Features And Benefits
Regional Availability
Latin America
North America
Asia Pacific
Middle East & Africa
Product Characteristics
Physical Form
Clear Liquid
Formulation Conditions
Use Level
0.5 – 5.0 % solid binder

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End uses

Technical product information


CYCAT 4045 catalyst is soluble in oxygenated solvents such as alcohols, glycols, glycol ethers and water. It has limited solubility in ketones, esters and hydrocarbon solvents.

Catalyst Addition

In order to prevent recrystallization of the acid, a sufficiently high level of alcohol should be present in the total solvent system of the formulation. Recrystallized acid can cause a reduction in cure response and may create local areas of high aciditiy that could cause the formation of gel structures. Therefore, it is suggested that CYCAT 4045 catalyst be diluted approximately 1 : 1 with an alcohol before adding to the final formulation.

Recommended Levels

CYCAT 4045 catalyst contains 20 % active acid and has an equivalent acid number of 60 - 70. Therefore, it is 50 % less active than the un-blocked CYCAT 4040 catalyst. Therefore, in comparison with CYCAT 4040 catalyst it is recommended that twice the level of CYCAT 4045 catalyst be used to provide approximately the same cure response.

In systems containing highly alkylated amino crosslinking resins such as CYMEL 303 LF resin in combination with hydroxyl or carboxy functional acrylic or polyester resins, the following starting point levels of CYCAT 4045 catalyst are recommended:

Polymer type Cure Temp °C Catalyst level (1)
R-OH > 150 1.0
R-OH 125 - 150 2.0
R-OH 110 - 125 4.0
R-COOH 150 - 175 1.0
R-COOH 125 - 150 2.0

(1) : % catalyst solution based on total resin solids

Typical Coating Characteristics

System: White high solids acrylic enamel, 73 % NV by wt, Pigment/Binder = 80/100

Binder: Acryloid AT-400 (2) acrylic resin/CYMEL 303 resin = 80/20 (solids wt ratio)

Catalyst: Equivalent to 1% CYCAT 4040 catalyst on TRS Cure: 20 minutes at 125°C

  CYCAT 4045 CYCAT 4040
DFT, mils 0.9 1.0
Gloss, 60°/20 °C 97/82 100/73
Knoop Hardness 15.6 14.8
Pencil Hardness 2H-3H 2H-3H
Salt spray (ASTM B-117):    
Initial (3) -/82/- -/73/-
144 hours (3) 0.5/81/10 0.75/77/8F
384 hours (3) 1.0/81/6F 0.75/76/6F
504 hours (3) 1.5/80/5F 1.5/75/6F
Humidity Resistance (Cleveland, 60°):    
Initial (4) 82/10 73/10
72 hours (4) 83/9D 74/10
168 hours (4) 75/9D 66/9MD
240 hours (4) 70/9D 60/9D
(2) Product of Rohm & Haas
(3) Rust/Gloss/Blister
(4) Gloss/Blister


Storage and Handling

At temperatures from 5 °C to 30 °C storage stability packed in original containers amounts to at least 730 days.

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