Avatrel

Each of these polymers exploit the ability of the group 10 metal catalysts used to tolerate functional groups and to copolymerise norbomene monomers bearing esters etc. into the polymer backbone. In the case of low-k dielectric polymers (Avatrel ) low levels (2-10 mol %) of 5-triethoxysilylnorbomene are used to impart good adhesive properties, the remaining 90+% of the monomer being a 5-alkylnorbomene. The alkylnorbomene is selected to tailor... 

Avatrel Promerus poly(norbomene) dielectric polymer... 

Avatrel Dielectric Polymers (low-k dielectric applications such as interlayer dielectrics, passivation layers, die attach adhesives, chip encapsulants (both molding and adhesive) and underfill materials). 

B. F. Goodrich, along with Georgia Institute of Technolog/s Packaging Research Center, have been developing cyclic olefin-based Avatrel dielectric polymers that exhibit many of the key performance criteria required for this demanding application. They include ... 

Very low moisture absorption. Typically, Avatrel polymers absorb less than 0.1 wt.% water, while polyimides typically range from 2 to 3 wt.%. Water uptake increases the dielectric constant of the medium and can facilitate conductor corrosion. 

Good adhesion to metals. Avatrel exhibits good adhesion (passes the cross-hatched tape test, ASTM D-3359-95a and IPG 650-TM) to metals such as Cu, Au, Al, Cr, Ti, and Si, as well as SiO2. Polyimides on the other hand require tie layers and adhesion promoters. 

In the case of Goodrich poly(norbornene) dielectric polymers [77] (Avatrel) low levels (2-10 mol%) of triefhoxysilylnorbornene (I, Ri = H, R2 = Si(OEt)3) are used to impart good adhesive properties, with the remaining 90+96 of fhe monomer being an alkylnorbornene (I, Ri = H, II,. = alkyl). The alkylnorbornene is selected to tailor the glass transition temperature of the polymer (Section 4.2.3.8) and to impart toughness into fhe product. 

Copolymers based on norbornene derivatives bearing different functional groups (Figure 16.10) are commercialized by Promerus," " a subsidiary of Sumitomo Bakelite Co. who took over this business from BF Goodrich. Using Ni- and Pd-based catalysts, they produce a range of tailor-made homo-, CO-, and terpolymers based on substituted norbornenes for applications in electronic materials. Three basic products have been developed at BF Goodrich Avatrel, Appear, and DUVCOR. ... 

Avatrel is a group of dielectric polymers based on copolymers of alkyl norbornenes (>90 wt%) and 5-norbornene-2-triethoxysilane (2-10 wt%), in which the alkyl group (Ri in Figure 16.10) is used... 

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