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Antioxidant for Elastomer Modified Benzocyclobutene (BCB) Based Polymers

IP.com Disclosure Number: IPCOM000011041D
Publication Date: 2003-Feb-11
Document File: 5 page(s) / 308K

Publishing Venue

The IP.com Prior Art Database

Abstract

An elastomer modified divinylsiloxane-bis-benzocyclobutene (DVS-bisBCB) was developed for various microelectronics applications (see U.S. 6,429,093 B1). It was prepared from DVS-bisBCB and an elastomer, BAC-45 (liquid polybutadiene diacrylate) from Osaka Organic Chemical Industry, Ltd.

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Antioxidant for Elastomer Modified Benzocyclobutene (BCB) Based Polymers

Background

An elastomer modified divinylsiloxane-bis-benzocyclobutene (DVS-bisBCB) was developed for various microelectronics applications (see U.S. 6,429,093 B1).� It was prepared from DVS-bisBCB and an elastomer, BAC-45 (liquid polybutadiene diacrylate) from Osaka Organic Chemical Industry, Ltd.

The liquid polybutadiene diacrylate, BAC-45, is miscible in B-staged DVS-bisBCB polymer/mesitylene solution and it was assumed that acrylate functionality could react with benzocyclobutene ring through Diels-Alder reaction and copolymer would� be formed upon the cure process.

The product of cure of the DVS-bisBCB/BAC-45 mixture was shown to maintain the DVS-bis BCB base resin's inherent excellent properties such as low dielectric constant, low dissipation factor, and low moisture up-take while enhancing mechanical toughness. � As a further optimization of this cured product, the effect of antioxidant formulation was studied.

Description

Dielectric constant and dissipation factor values of cured elastomer modified DVS-bisBCB containing 18% BAC-45 increased after the cured mixture was exposed to heat (125o C) as shown in Figure 1.

Figure 1.

Hindered phenols, especially Irganox 565 from Ciba-Geigy and the combination of Irganox 565 and phosphites such as tris(nonylphenyl) phosphite and Irgafos 168, are effective antioxidants for elastomer modified DVS-bisBCB polymer.� Figure 2 shows the positive effect of adding 4 phrs Irganox 565, a combination of 2 phrs Irganox 565 and 2 phrs Irgafos 168, or 2 phrs Irganox 565, to� DVS-bisBCB polymer containing 18% BAC-45.� Compared to the change in dielectric properties of the cured mixture without antioxidant, shown in Figur...