materials feature | PVC Additives
Akcrostab BZ-5295NP is said to exhibit very good printability as well as low volatility and is suitable for applications requiring certifi cation by Underwriters Laboratories’ Greenguard Environmental Institute, which certifi es products and materials for low chemical emissions.
The notched impact strength of Add-Chem’s CAM range is similar to, or better than, conventional AIM and CPE systems
additives in the production and processing of polymers, paint and coatings. It has a primary manufacturing site in New Brunswick, in New Jersey in the US, as well as one in Eccles in the UK, together with additional production capability in India and China (the latter in a joint venture and toll production partnerships using its proprietary technology). The acquisition of Akcros will provide additional
manufacturing capabilities, increased product breadth and a global presence, “helping Valtris expand into a leading global player in the polymer additives industry,” the company said when it announced the deal. Thomas Specht, Manager of Marketing and Business Develop- ment, says the company’s position in tin stabilisers for the North American market will also be strengthened. Emphasising that point, Peggy Schipper, Business
Director, Lubricants (who has come across from Akcros in the US), says the company is introducing Akcrostab T-5330 6% butyl tin heat stabiliser targeted for high output, rigid PVC substrate extrusion such as siding and profi le “where cost effectiveness is paramount.” She says: “Akcros tin stabiliser technology is designed to have more guts than typical equivalent tin competitive products.”
Specht says that while the acquisition of Akcros has
provided Valtris with a full array of both tin and tin-free stabilisers, its recent focus has been to develop tin-free alternatives. In fact, Akcros (as it was) and Valtris have both recently introduced new barium-zinc heat stabilisers. Last September, Akcros introduced Akcrostab BZ-5295NP for filled or pigmented flexible films and plastisols such as wallcovering or specialty fabrics. The company said it has been “developed to meet the lower volatility and tighter environmental standards required by consumers of vinyl building products. Akcrostab BZ-5295NP has no phthalate and ultra-low phenol.”
26 PIPE & PROFILE EXTRUSION | July/August 2016
This April, Valtris unveiled Therm-Chek RC896L, which it says was formulated without the use of Substances of Very High Concern (SVHCs) under the European REACH regulatory system. It also features low phenol levels, low levels of VOCs and does not contain BPA or BHT. Therm-Chek RC896L can be used in fl exible, semi-rigid, clear and opaque PVC formulations. The balance of heat stability and lubrication allows it to be processed on calendaring or extrusion equipment. It can also be used in applications requiring printability. Valtris has developed a low emission, low odour
stabiliser system that offers good performance under high temperature ageing and that shows minimal discolouration when used with waterborne coating systems. The new system is currently being introduced into the market. It is a multi-component solution consisting of a high performance Ca-Zn stabiliser, Lastab CF419, together with a new proprietary booster package specially developed for this purpose. AM Stabilizers manufactures and supplies barium
and calcium intermediates used in the production of mixed metal heat stabilisers for PVC. The company says recent regulatory changes such as REACH, as well as tighter end-user specifi cations and restrictions on VOC emissions from consumer products, are driving technology change in PVC products and the additives used in their production. The latest addition to the company’s product range is a high metal content barium intermediate, PlastiStab 2534. This contains contains 34% Ba in a liquid form and is said to offer an extremely low VOC content, no phenol, no alkyl phenols, and almost no odor. When liquid mixed metal stabilizers are formulated with PlastiStab 2534, resulting products are free of these substances of concern, the company claims. It says its liquid calcium intermediates, PlastiStab 2265 and PlastiStab 2266, are also free of the above substances.
Making an impact ADD-Chem has introduced its ADD-CAM (CPE Acrylic Modifi er) range of impact modifi ers for rigid, opaque PVC in weatherable applications. It compliments ADD-Chem’s existing acrylic impact modifi ers (AIM) and chlorinated polyethylenes (CPE), blending both types to give what the supplier describes as an alternative cost effective system for extrusion and injection moulding processes suitable for applications as diverse as
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