Searching for that soft, silky touch for your brochure cover or package coating? Look no further. There are 3 new soft-feel grades to answer your haptic dreams - Hauthane HD-3810, HD-3820 and HD-3830.
HD-3810 is a soft-feel base polymer with no silicone or flattening agent that offers a rubbery surface feel. HD-3820 and HD-3830 are partially formulated, ready-to-use grades that provide a silky and a slick surface feel, respectively. These materials are perfect for many overprint varnish applications where a luxurious surface feel is a critical component of the presentation. We'll even send you coated card stock samples of each to evaluate.
URETHANE ACRYLIC HYBRIDS
Hybrid technology combines the characteristics of polyurethane dispersion and acrylic emulsion polymers into a single material. The benefits of this combination include improved adhesion to most substrates, enhanced exterior durability, higher solids and lower VOC formulating potential. Hauthaway offers 2 new, self-crosslinking polyurethane acrylic grades, Hauthane L-3728, a hard, exterior-durable, NMP-containing product and its pyrrolidone-free sister, Hauthane L-3773. These are intended for use as topcoats on metal, plastic and wood substrates.
WATER-BASED, UV-CURABLE PUD'S
Hauthaway had previously introduced a zero VOC, polyester-based, water-borne, UV-curable PUD for kitchen cabinet, wood flooring and plastic substrate applications, called Hauthane L-3415. The feedback we received was very positive, but some formulators/applicators wanted a harder, more chemical-resistant grade. To achieve this we developed a two polycarbonate-based grades called Hauthane L-3685 and L-3790. L-3685 contains NMP co-solvent; L-3790 is pyrrolidone-free. Both deliver high pencil hardness values in the 4H to 5H range, and chemical spot test results are second to none.
UV-curable PUD's produce hard, chemical-resistant films with resistance to a variety of automotive and consumer test reagents including the aggressive ingredients in sun tan lotion, insect repellent, hand sanitizers and specialty lotions.
These products offer the applicator the ability to apply a coating to a substrate using conventional application techniques for water-based coatings. The coatings are then dried under ambient or force-dried conditions before exposure to UV energy. This approach allows for the easy repair of blemishes prior to curing. It also makes the technology suitable for coatings applied to two-dimensional plastic substrates which are intended to be thermo-formed before UV-curing.
Hauthaway has offered several variations of self-crosslinking PUD's in recent years, but only recently were we able to provide a pyrrolidone-free grade. The product, called Hauthane L-3786, affords the performance equivalent of a water-based, 2K coating system in a single can, but there is no pot-life and no mixing is required. We suggest it for applications such as wood and concrete flooring and for industrial maintenance applications where high chemical- and stain-resistance are essential. The product takes 3 - 5 days to attain final performance characteristics in conditions above 60°F, but is dry to the touch in 2 hours and can be walked on in 24 -36 hours.
ALTERNATIVE CO-SOLVENTS FOR POLYURETHANE DISPERSIONS
The co-solvent of choice for most polyurethane dispersion manufacturers until recently has been N-methyl pyrrolidone (NMP). It offers a number of very beneficial characteristics including water-miscibility, strong polarity and slow evaporation rate that are ideal properties for the processing and coalescing of water-based polyurethane dispersions. Due to concerns about worker exposure and environmental contamination in some states and regions however, producers are looking at alternative solvents with similar properties.
To address these concerns, Hauthaway has developed a line of PUD’s that uses an alternative co-solvent called dipropylene glycol dimethyl ether (DMM). This solvent is considered to have low toxicity for humans and presents far less of an environmental risk. Dow Chemical’s Safety Data Sheet states the following:
DMM has low toxicity if swallowed. Swallowing small amounts as a result of normal handling operations is unlikely to cause injury. However, swallowing larger amounts may cause injury. In laboratory animal testing, exposure to DMM is not anticipated to cause birth defects or interfere with reproduction. Genetic toxicity studies were negative.
DMM is volatile, and will evaporate from products containing it. However, because it is moderately soluble in water, once introduced, it has a tendency to remain in water. It has minimal tendency to bind to soil or sediment. DMM is unlikely to persist in the environment. DMM is inherently biodegradable, which suggests the chemical will be removed from water and soil environments, including biological wastewater treatment plants. DMM is not likely to accumulate in the food chain (bio-concentration potential is low), and it is practically nontoxic to fish and other aquatic organisms on an acute basis.
DMM, however, is not the perfect solution. It is not as effective a coalescing solvent as NMP, so hard PUD polymers will require the addition of other slow evaporating co-solvents such as dipropylene glycol monomethyl ether (DPM) or dipropylene glycol n-butyl ether (DPnB) to attain optimal film formation.
In chemical- and stain-resistance testing, the DMM-containing versions performed comparably to NMP-containing grades at the same VOC content level. The same was generally true for other properties such as abrasion- and scratch/mar-resistance.
If you are interested in evaluating alternatives to NMP-containing polyurethane dispersions, Hauthaway has a complete line of DMM products suitable for just about every application.
Bio-renewable Based Polyurethane Dispersions
Hauthaway introduced 2 new polyurethane dispersions, Hauthane L-3360 and L-3369, that are partially synthesized from bio-based raw materials. Hauthane L-3360, the softer grade, has 50% bio-renewable content.
It is suggested for applications like textile and leather topcoats, while L-3369, a medium hard grade at 42% bio-renewable content is recommended for wood and concrete flooring, as well as wood furniture. L-3369 has remarkably high alcohol resistance characteristics for a polyurethane dispersion.
Silicone-modified Polyurethane Dispersion
Hauthaway has introduced Hauthane L-3466, a new, higher silicone content (vs. HD-2602), polyurethane dispersion for a variety of applications requiring surface slip properties, abrasion-resistance and dye-transfer resistance.
End-use applications include flexible substrates such as leather and PVC sheet for seating surfaces to rigid substrates like wood used for kitchen cabinet finishes.
Crosslinked versions of coatings using L-3466 may be suitable for automotive interior, and for dry-erase, white board end-uses where dye-transfer resistance is a critical consideration.
For more details please check L-3466 Technical Data Sheet.
Co-solvent free, TEA-free, Tin-free, APEO-free Polyester-based Polyurethane Dispersions
The desire for cleaner and greener coatings polymers was the impetus for the development of 2 new grades that offer the formulator the ability to produce low VOC, environmentally-conscious coatings. Originally designed for the European market with its focus of applicator-friendly coatings, the products are free of co-solvent, TEA, APEO surfactants and tin. Hauthaway offers a hard grade, Hauthane L-3615, for wood, plastic and concrete end-uses, and a soft grade, Hauthane L-3614, for textile and leather applications.
Co-solvent free, APEO-free, Tin-free Polycarbonate-based Polyurethane Dispersions
Polycarbonate-based PUD’s have been around for decades (see HD-2500 series grades), but the need for lower VOC content coatings with hydrolysis resistance characteristics prompted Hauthaway to develop 2 new grades that fill a formulating gap. With Hauthane L-3528 (hard) and L-3529 (soft), Hauthaway provides the formulator with the ability to develop <100 g/l (less water) compliant coatings that stand up to environmentally challenging conditions such as high humidity and UV exposure.