摘要:
A process for the stoichiometric carbonation of a hydroxyaromatic material is provided which comprises the steps of (a) mixing together in a reaction vessel (1) a hydroxyaromatic material, (2) a sufficient amount of a dialkyl dicarbonate to give the desired degree of substitution, (3) a catalytic amount of an unhindered tertiary amine, and (4) a solvent, (b) stirring the reaction mixture, (c) precipitating the alkyl carbonate of the hydroxyaromatic material, and (d) recovering the alkyl carbonate of the hydroxyaromatic material.
摘要:
Liquid compositions containing a specific hindered phenol or a hindered phenol in combination with an aromatic phosphite are provided which are used as a thermal interface between a heatsink and a chip during a test procedure for electronic components which compositions enhance the thermal conductivity between the heatsink and the chip, are easily removed from the heatsink and the chip after the test procedure without any deleterious residue and which allow the use of high temperatures for extended periods during the test procedure without any significant degradation of the composition. A method for using the compositions in electronic component test procedures such as burn-in procedures is also provided.
摘要:
The present invention relates to a process that minimizes the cracking of low-k dielectric polymers. In an example embodiment, on a semiconductor substrate (200), there is a method of forming a composite dielectric disposed on a metal layer passivated with plasma deposited silicon oxide SiOx. The method comprises depositing a first layer of a first predetermined thickness of a spin-on dielectric on the metal layer protected with a plasma deposited silicon oxide SiOx. Next a thin stress relief layer of a second predetermined thickness is disposed on the first layer of spin-on-dielectric. Upon the thin stress-relief layer, a second layer of a third predetermined thickness of spin-on dielectric is deposited. Low-k spin-on dielectrics may include hydrogen silsequioxane (HSQ) and methyl silsequioxane (MSQ).