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elastomers with a refractive index of 1.53, which ranks them among high- refractive-index (HRI) encapsulants, enabling excellent light efficiency. The silicones are almost com-
pletely transparent to light in the visible spectral range (400-700 nm) and do not yellow under intense radi- ation. Lumisil 590 and 591 are designed to protect LED chips from environmental influences to prolong their service lives. These silicone compounds are able to be processed in industrial metering processes, such as dispensing. Lumisil 740 and 770 are nor- mal-refractive-index (NRI) encapsu-
www.us-
tech.com Wacker Silicone R&D to the Forefront
lants that have a refractive index of 1.41, which is typical of polydi- methylsiloxanes. Along with protecting chips
from environmental influences, they can serve as carriers of luminescent dyes, selectively influencing the color of the light emitted by the LED. A special feature of 740 and 770 is their extremely high heat, light and ther- mal-shock resistance. Due to their stability, the new
silicones are particularly suitable for encapsulating LED chips with strong heat generation and intense light emission. Wacker developed its Lumisil LR 7601 for manufacturers of optical
lenses and coupling elements. The product is predominantly character- ized by a significantly lower volatiles content than the previous grade, which reduces post-curing time. The encapsulant is suitable for lenses, sensors and optical coupling elements in lighting technologies and can be processed cost-effectively in large- scale injection molding processes.
Further Product Highlights The company is also introducing
new polymer additives for bioplastic compounds. Its Vinnex® additives considerably enhance the processing and properties of biopolyesters or blends with starch.
Vinnex 2526 has been formulat-
ed to simplify the manufacture of highly-transparent, rigid polylactic acid (PLA) films. The company’s Vinnex 2522, 2523 and 2525 product lines are designed to significantly improve processing and heat-sealing properties in paper coatings with PLA or polybutylene succinate.
December, 2016
Wacker’s ACEO technology
enables complex silicone 3D printing.
Vinnex 8880 was created to optimize the flow properties in the melt for injection-molding applications and 3D printing, so that temperature- sensitive and complex items can be readily produced. Wacker’s Primer G 790 toluene-
free (TF) is used to achieve reliable adhesion between addition-curing silicone rubbers and hard substrates such as aluminum, stainless steel or glass. In comparison with many con- ventional adhesion promoters, the primer contains no toluene or other aromatic compounds. The Elastosil® color paste FL
UV fluorescent was designed for the fluorescent marking of addition-cur- ing silicone rubber. Silicone molded parts or coatings pigmented with the new paste shine a deep blue-violet under UV light. Silicone processors can make use of this property to develop computer-controlled quality control systems in manufacturing. The electrically-conductive sili-
cone rubber dispersion Powersil® 403 has been developed for furnishing the outer conductive film on fittings for transmission and distribution cables. The product yields a coating
characterized by high elasticity, good mechanical properties and scrub resistance. This makes the disper- sion suitable even for cable fittings to be installed by cold-shrink processes. The product contains no aromatic compounds such as toluene. Finally, Semicosil® 811, a rapid-
curing silicone rubber adhesive for electric applications, is designed for oven-free processing. Even with little heating, the product rapidly bonds to several substrates. Manufacturers of electronic components are able to adapt the processing of the adhesive to production processes in a flexible way, cutting down cycle times. Due to its durability, which is typical of silicones, 811 is especially suitable for automotive electronics and dis- play applications. Contact: Wacker Chemical
Corp., 3301 Sutton Road, Adrian, MI 49221 % 888-922-5374 fax: 517-264-8246 E-mail:
info.usa@
wacker.com Web:
www.wacker.com r
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