K-FLEX^® Polyester
Polyols, Urethane Diols and Specialty Modifiers

K-FLEX® is King Industries' trademark used to describe three distinct product lines of specialty polyols and resin modifiers consisting of the following chemistries:

K-FLEX POLYESTER POLYOLS are based upon low molecular weight linear, saturated, aliphatic structures with pendant hydroxyl groups. They are used to:

• Increase film flexibility while maintaining
  hardness
• Improve resistance properties
• Reduce VOC’s - increase solids
• Achieve higher crosslink density
• Improve cure adhesion

K-FLEX URETHANE DIOLS are novel, low molecular weight diols with an allurethane backbone. The urethane diols are useful in various industrial systems based on the following chemistries:

• Amino crosslinked systems
• 2-component polyurethanes
• Blocked Isocyanates
• Prepolymer synthesis

K-FLEX SPECIALTY PRODUCTS include two 100% active, acetoacetate functional reactive diluents. K-FLEX XM-B301 and 7301 are particularly effective in epoxy/polyamide primers and systems crosslinked with amino resins or polyisocyanates.

K-FLEX® 100% Active Polyester Polyols
PRODUCT	Hydroxyl # On Solids	Viscosity 25° C (cPs)	Tg	Attributes/Uses	Technical Data Sheet
K-FLEX 188	230	10,000	-32˚C	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 A308	260	1,500	-59˚C	Similar to 188 but the low viscosity combined with the higher hydroxyl number gives good hardness and adhesion while allowing lower VOC levels.
K-FLEX 148	235	3,750	-42˚C	Improves flexibility, and gloss. Increase solids at lower viscosity. Good flow and leveling. Excellent intercoat adhesion properties.
K-FLEX A307	140	5,400	-50˚C	Flexibility modifier for acrylic/isocyanate and acrylic/melamine systems. The low hydroxyl number minimizes the crosslinker demand.
K-FLEX® Urethane Diols
PRODUCT	Hydroxyl # On Solids	Viscosity 25° C (cPs)	Tg	Attributes/Uses	Technical Data Sheet
K-FLEX UD-320W UD-350W	350	8,000-320W 4,000-350W	<1	Water soluble in absence of amine and co-solvent. Higher solids, improved flow, gloss, hardness and resistance properties. UD-350W for optimum storage stability.
K-FLEX UD-320	350	9,000	<1	Increases application solids and hardness. Improves chemical resistance, exterior durability and  hydrolytic stability.
K-FLEX UD-320-100	350	7,000 at 50˚C	<1	Prepolymer synthesis. For water or solvent. Preparation of polyester urethanes.
K-FLEX Specialty Products
K-FLEX XM-B301	Equivalent Weight* 190	1,100		Acetoacetate functional reactive diluent for use in 2-component epoxy primers, adhesives and sealants.
K-FLEX 7301	Equivalent Weight* 125	150		Acetoacetate functional reactive diluent for use in 2-component epoxy primers, adhesives and sealants. TSCA/DSL only.
* Equivalent Weight - Active Hydrogen