Dow Performance and Momentive launch new silicone products

June 20, 2018

DOWSILDow Performance Silicones further enhanced design flexibilities and processing options for consumer device and display OEMs with the addition of two new products, Dowsil SE 9100 and Dowsil SE 9160 adhesives, to its portfolio of one-part, room-temperature cure (RTV) silicone solutions. In addition to offering versatile processing options, the two new silicone adhesives bond well to most substrates, deliver excellent rework ability with no residue, exhibit high flow to fill narrow gaps and enable cure-in-place-gaskets (CIPG) that offer effective seals compatible with IPX7-rated water resistance, according to the company.

Dowsil SE 9100 adhesive is a one-part silicone formulation that achieves fast tack-free processing at room temperature with the option to accelerate cure with the application of heat. It demonstrates low (<1%) shrinkage by volume after cure to minimise internal stress for optimal sealing, and offers cost-effective processing and repairability during the assembly of mobile and display modules and other consumer devices. Dowsil SE 9160 adhesive is also said to exhibit many of these same properties, yet its dual-cure formulation offers the option of faster in-line processing through irradiation with ultraviolet (UV) energy at densities as low as 4,000 mJ/cm2 to component assembly to continue within seconds. Higher densities (10,000 mJ/cm2) enable the material to quickly achieve full, deep section cure. In addition, in designs where the silicone adhesive is partially “in shadow” from the UV lamp, Dow’s new silicone adhesive will still secure rapid moisture cure. Dowsil SE 9160 adhesive is suitable for sealing small- to medium-sized consumer devices such as smart phones, tablets and displays.

It is targeted at sealing air gaps or holes between LCD or OLED display panels and their plastic cover frames.

productsIn other news, US silicones company Momentive Performance Materials has launched SilGrip PSA810 pressure sensitive adhesive (PSA) for specialty masking and assembly tapes used in Electronic and Industrial market segments. This next generation PSAs addresses the need for tapes that will perform longer at higher temperatures without losing adhesion or leaving unwanted silicone transfer behind after removal. SilGrip PSA810 adhesive can deliver dramatically advanced high temperature adhesion and allow customers to manufacture improved tapes that will perform at the ever-increasing processing temperatures required for applications such as flame spray and PCB masking.

“Momentive has been working at our global innovation centers and directly with specialty tape manufacturers to develop this new, innovative adhesive solution,” said Mark Fraser, Global Leader of our Pressure Sensitive Adhesives business. “We are committed to innovation and increasing the possible performance level of specialty industrial tapes by introducing adhesive products that continue to meet the ever challenging needs of the various markets that require such solutions,” added Mr. Fraser.

SilGrip PSA810 PSA is a toluene solution of polysiloxane gum and resin that is supplied at 61% silicone solids, and which can be further diluted with aromatic, aliphatic or chlorinated solvents to lower the coating viscosity. The adhesive can be blended with SilGrip SR545 resin dispersion or with other methyl-based silicone pressure sensitive adhesives and cured with benzoyl peroxide to obtain specific performance properties.

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