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products | Polymers and additives PIGMENTS

Huntsman launches solar reflecting pigments


HallStar wins patent for bio-additive

Altiris can be used to increase the solar reflectance of coloured vinyl siding

Huntsman has commercial- ised an infrared reflecting pigment based on titanium dioxide that allows polymer products of any colour to reflect solar energy. Called Altiris, the additive can increase solar reflection by more than 100% in some colour ranges, according to the company. In addition, surface temperatures can be reduced by more than 50% in certain colours. Such results can help

increase the lifespan of products as they stay cooler and suffer less from heat cycling stresses. Altiris can be used to make plastic products less prone to warping, allowing them to be used in warmer regions of the world.

COMPATIBILIZERS Adell adds coupling agents

Adell Plastics has launched a new line of maleic anhydride- modified polyolefins for use as compatibilizers in polymer compounding. The additives have been designed to reduce the interfacial forces between


polymers and fillers to increase adhesion. They can also deliver more uniform dispersion and more stable morphologies. Initial offerings in Adell’s

new compatibilizer product family include EK-10-MAH


which is recommended for the coupling of glass and other fillers in PP compos- ites. The other new product is KK-10-MAH for the coupling of glass, wood pulp and other fillers in HDPE formulations. ❙

According to Huntsman, its

new pigment means that products like vinyl siding and window profiles can be made available in wider range of colours. It can be applied in single extrusions or in coloured capstocks. The company adds that such applications can help to keep buildings cooler and more energy efficient. Altiris can also be used in a wide range of other resins and additional target applications include leisure products and automotive components. Dr. Rob Portsmouth,

business development director at Huntsman says: “Our Altiris pigment delivers a unique set of benefits: superior tailored reflectance from a single additive and in any colour

customers need”. Unlike conventional TiO2

, Altiris

does not impart whiteness and has been specifically engineered to provide infrared reflection. Two grades have been

launched so far. Altiris 550 pigment has high solar reflectance and is particularly suited to medium to light shades. The other choice, Altiris 800 has been designed to have a combination of high infrared reflection and low tint reduction making it suitable for use in dark and vibrant colours. Huntsman has developed

software to help with the opti- misation of colour formula- tions incorporating Altiris. ❙

HallStar has been awarded a US patent (number 8,158,731) covering biopolymer compositions with improved flexibility. It applies to the company’s novel, bio-based polymeric additives, which are derived from renewable feedstocks. Its HallGreen R-8010

product is a new, bio-based polymeric succinate that improves the flexibility of biopolymers including PLA, starch-based polymers, PHA, and PHB. “Brittleness can be a real

problem with biopolymer products,” says Robert Hu, HallStar vice president for resarch and development. “HallGreen R-8010 enhances the flexibility and pliability of compounds and end products, and it provides tangible benefits at customers’ manufacturing facilities by increasing throughput and reducing energy consumption.” Test results show that

performance benefits can be seen at concentrations as low as 10%. HallStar adds that when used at 30% loading levels, R-8010 provides a tenfold increase in elongation percentage at break and a 5% reduction in both tensile strenth and tensile at break. In addition, it increases the melt flow index, which can increase throughput and reduce melt temperature and energy consumption in processing facilities. ❙

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