Coating Additives

K-FLEX® POLYESTER POLYOLS

K-Flex polyester polyols (Table 1) are used primarily as modifiers for acrylic, alkyd, epoxy and polyester formulations. They are structures with narrow molecular weight distribution designed for high reactivity and fast cure with melamine and isocyanate crosslinkers.

Containing primary hydroxyl groups, K-Flex polyester polyols are typically used at 5-15% modification levels on standard resins to:

	Increase film flexibility
	Improve resistance properties
	Reduce VOC's, increase solids
	Achieve higher crosslink density, improve cure response

A K-Flex/Melamine ratio of 60/40 is recommended for modifying typical resin systems.

K-Flex 188 can be used as an effective modifier for water reducible coatings. The addition of a suitable co-solvent is used for solubility and stability.

Table 1

Product

Composition

Hydroxyl #
on Solids

Viscosity
25°C (cps)

Lbs/Gal

Attributes/Features

K-Flex
188

100% Active
Polyester Polyol

230

10,000

9.3

Improves flexibility, salt spray and humidity resistance while maintaining hardness. Highest reactivity. Excellent adhesion to many substrates including plastics. Highly recommended for 2K urethane applications.

K-Flex
148

100% Active
Polyester Polyol

235

3,750

9.4

Improves flexibility, and gloss. Increases solids at lower viscosity. Good flow and leveling. Excellent intercoat adhesion properties.

K-Flex
128

100% Active
Polyester/Polyether
Polyol

240

2,000

9.0

Lowest viscosity. Best flexibility. Lower VOC's. Good flow and leveling.

K-Flex
171-90

88% Active
Chain extended
version of 188.
Volatile (1:1)
n-Butyl Acetate/Xylene

122

3,700

9.2

Offers better pot life with isocyanate and amino crosslinkers. Good flow and leveling. Lower isocyanate demand. Excellent for 2K urethane applications. Good adhesion particularly to plastic substrates.