Northstar Polymers
info@northstarpolymers.com


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What's new development at Northstar Polymers



NEWS



Room-Temp-Pourable Polyurethane for Custom Skate Wheels Tough, Resilient, High-Rebound, Room-Temp Pourable Polyurethane Resin Formulations



When wheels for roller skates, skateboards, and inline skates are designed, the choice of wheel materials is very important. The material must have a good rebound property. It must be resilient for the grip and comfortable rides, and it must also be abrasion resistance for the longevity. Northstar Polymers has developed a series of PTMEG based polyurethane casting resin formulations that can be mixed and poured at room temperature. The formulation allows longer pot life to allow manual mixing and degas at room temperature. The resin is then cast into a heated mold and posted cured in an oven. The physical properties of these formulas are close to those of the high-performance PTMEG formulations.



See A video of the sample rebound test showing the rebound properties of the skate wheel formulas

https://youtu.be/9LmrX9bf7Uc



Sticky pad materials (reusable PSA) GK-7 and new GK-22R



Soft and sticky materials used in cellphone holders, small sticky pads for non-invasive wall tacks, and other sticky surfaced products can be made of polyurethane gel compounds, which are intrinsically sticky inside and outside. When the surface is contaminated, a user can wash off the surface and it will be sticky again. Cut surfaces of polyurethane sticky pads are also sticky.


Processing polyurethane gel compounds do not involve drying out solvent carrier or need air or moisture to cure. It can be made into practically any thickness. Most of the polyurethane gel formulations can be processed at or near room temperature. The curing rate can be accelerated by the addition of catalysts and processing at an elevated temperature. This makes polyurethane gel-based sticky pad materials an ideal material choice for many specialty applications.


Northstar Polymers offers GK-7 and GK-22R formulations for sticky pad making applications. GK-7 formulation has the stickiness of commonly marketed cellphone holders and non-invasive wall-tack products. Our new GK-22R formulation makes products with a higher adhesion strength. Both formulations are made in such a way that the processor can adjust the stickiness of final products by some simple adjustment process.


GK-7
GK-22R
Adhesion Data

Viscoelastic Foam



VEF-121 is our latest version of polyurethane open-cell flexible foam with viscoelastic property for a variety of cushioning and other custom applications. The cured foam has a very low deflection against a compression force. Foam recovers slowly after the load is removed. The foam stays flexible at a very lower temperature. The component materials are low viscosity liquid at room temperature. The pot-life is above 25 seconds, which allows small amounts to be batched manually. VEF-121 provides a range of foam consistency to be adjusted by varying the mixing ratio between the part-A/ part-B components. The recommended mixing ratio range is between 100:260 and 100:300 = part-A: part-B by weight. A higher part-B ratio makes foam with a slower recovery rate and smaller compression deflection.


VEF-121

Easy Process Flexible foam for upholstery, Packaging, and other custom applications



Polyurethane flexible foams are used in many upholstery applications such as cushioning materials for chairs as well as motorcycle seats. Many times, the custom foam parts are made by cutting slab stock foams. MPP-F07A offers molded-foam options for the custom upholstery makers. The biggest challenge to process polyurethane foam is the short pot-life. Typical polyurethane foam only allows about 20 to 30 seconds of pot-life at the maximum. MPP-F07A polyurethane flexible foam compound allows a pot life of about 60 seconds, which makes the foam molding process much easier.


MPP-F07A

NEW LOW TACK SOFT GEL ELASTOMER SERIES



Unlike conventional soft grade polyurethane gel elastomer formulas, these formulations create low tack surface molded products with high elongation. Easy-processing, lower tooling costs, and reasonable pricing of these formulations provide the molders overall cost advantage over TPE and silicone gel materials.


Low Tack Soft Gel

Moisture Cure Recycle Foam Crumb Bonding and Other Particle Bonding Applications



This two-part moisture-cure polyurethane adhesive system is designed to be used with recycled ground rubber, polymer foam, polymer beads, as well as other particles such as cork granules, wood, and pulp fiber/particles/powder to make the various recycled foam and other bonded particle products. Northstar Polymers' new particle bonding system consists of 2 different moisture-cure prepolymer components. By changing the blending ratio, the user can vary the flexibility of the end product. A higher amount of MPA-221 will produce a more flexible product. A higher amount of MNB-013 will produce a more rigid product.


MPA-221/MNB-013

Contact



Tandem Products, Inc. /dba Northstar Polymers
3444 Cheatham Avenue, Minneapolis, MN 55406, USA
Tel: +1(612)721-2911, Email: info@northstarpolymers.com