KN7550P hydroxyl acrylic resin from KENXON combines high gloss, good leveling and high hardness for coating formulations. With a solids content of 75 ± 2%, it also supports a full-bodied coating appearance.
The recommended applications include PU pigmented coatings and clear coats. KN7550P serves as a resin raw material that coating manufacturers combine with suitable hardeners, solvents and additives.
High Gloss and Good Leveling
KN7550P targets coating systems that require a glossy, smooth appearance.
In the supplied reference clear-coat formulation, the coating achieved a 60° gloss reading of 95. In addition, the visual leveling assessment recorded a smooth, even surface without craters.
The same formulation passed the film-fullness assessment, with good fullness and high distinctness of image. Together, these results demonstrate the appearance achieved by the tested coating system.
High Solids Content and Hardness
The resin has a solids content of 75 ± 2%. This makes high solids content one of its main formulation characteristics.
Alongside appearance, KN7550P offers high hardness. The reference test table records an H pencil-hardness result in its general hardness assessment.
However, the document lists early hardness separately: below HB at 8 hours and HB at 24 hours. Therefore, formulators should distinguish these early readings from the separate H result when evaluating their coating system.
KN7550P Technical Properties
| Property | Specification |
|---|---|
| Composition | Acrylic copolymer |
| Appearance | Clear and transparent |
| Solids content | 75 ± 2% |
| Viscosity at 25°C | 5–9 Pa·s |
| Acid value | 6–12 mg KOH/g |
| Color | ≤1, Fe-Co scale |
| Solvent | Xylene |
These values describe the resin as supplied. By contrast, the coating test results below relate to the reference formulation.
Reference Clear-Coat Performance
The technical document provides a two-component clear-coat formulation using KN7550P and an N3390 hardener.
It specifies a baking condition of 70°C for 60 minutes, followed by 24 hours of conditioning before chemical-resistance testing. The following table summarizes selected results from that reference system.
| Test | Reported Result |
|---|---|
| Surface drying | 20 minutes |
| Hard drying | 24 hours |
| 60° gloss | 95 |
| Pencil hardness, separate general assessment | H |
| Cross-cut adhesion | 100% |
| Flexibility, bend test | 1 mm |
| Film fullness | Passed; good fullness and high distinctness of image |
| Leveling | Passed; smooth and even, without craters |
| Alkali resistance | Passed: 5% NaOH for 48 hours, without blistering, peeling or discoloration |
| Accelerated weathering | Passed: 700-hour QUV test, without discoloration or peeling; gloss loss ≤1% |
These results apply to the documented formulation and test conditions. Consequently, manufacturers should validate performance in their own coating system.
Compatibility and Solvent Options
The document lists KN7550P as compatible with several KENXON resin grades:
- KN6650P
- KN6652P
- KN6701P
- KN7530P
- KN6532P
- KN6565P
It also lists solvent compatibility with xylene, trimethylbenzene, butyl acetate, cyclohexanone, ethylene glycol monobutyl ether, ethylene glycol ethyl ether acetate, isobutanol and n-butanol.
These options provide a starting point for formulation development. Nevertheless, check compatibility in the complete blend before production.
Recommended Applications
KN7550P hydroxyl acrylic resin suits the development of:
- PU pigmented coatings
- Clear coats
- Two-component clear-coat systems based on the supplied reference formulation
For projects that prioritize gloss, leveling, fullness and hardness, KN7550P offers a resin option to evaluate. First, define the required finish and application conditions. Then, assess the resin with the selected hardener and additive package.
Packaging and Storage
KENXON supplies KN7550P in 200 kg drums.
Keep containers tightly closed in a cool, ventilated place, away from heat and ignition sources. The stated shelf life is 24 months from the production date under the recommended storage conditions.
Because the product contains solvent, consult its safety data sheet for handling information.
Request Technical Data for KN7550P
Developing a PU pigmented coating or clear coat?
Contact KENXON to request the technical data sheet, reference formulation and sample information for KN7550P hydroxyl acrylic resin. Share your application conditions and target properties so the discussion can focus on your formulation needs.
Visit KENXON’s website to learn more and submit your inquiry.