Henkel Corporation

The Goodyear & Tire Rubber Company

Quantum Materials Corporation

The Dexter Corporation

Quantum Materials/dexter Corporation

Dennis B Patterson

Stephen M Dershem

Jose A Osuna, Jr

Adel Farhan Halasa

Dane Kenton Parker

Robert A Smith

Jose A Osuna

Deborah L Derfelt

Howard Allen Colvin

Arthur H Weinstein

Lloyd D Hess, Jr

Jr Jose A Osuna

In accordance with the present invention, there are provided novel thermosetting resin compositions which do not require solvent to provide a system having suitable viscosity for convenient handling. Invention compositions have the benefit of undergoing rapid cure. The resulting thermosets are stable to elevated temperatures, are highly flexible, have low moisture uptake and are consequently useful in a variety of applications, e.g., in adhesive applications since they display good adhesion to both the substrate and the device attached thereto.

Vinyl compounds

Thermosetting resin compositions containing maleimide and/or vinyl compounds

Maleimide compounds in liquid form

In accordance with the present invention, there are provided novel thermosetting resin compositions which do not require solvent to provide a system having suitable viscosity for convenient handling. Invention compositions have the benefit of undergoing rapid cure. The resulting thermosets are stable to elevated temperatures, are highly flexible, have low moisture uptake and are consequently useful in a variety of applictions, e.g., in adhesive applications since they display good adhesion to both the substrate and the device attached thereto.

In accordance with the present invention, there are provided novel adhesive compositions which do not require solvent to provide a system having suitable viscosity for convenient handling and cure rapidly. The resulting thermosets are stable to elevated temperatures, are highly flexible, have low moisture uptake and good adhesion to both the substrate and the device attached thereto.

Bismaleimide-divinyl adhesive compositions and uses therefor

Thermosetting resin compositions containing maleimide and/or vinyl

In accordance with the present invention, there is provided a novel composition for attaching a semiconductor device to a substrate. The invention composition comprises liquid polycyanate ester monomer, electrically conductive filler, and a curing catalyst, in the substantial absence of alkylphenol. The recognition that attach paste compositions are effective without the addition of alkylphenol has the benefit of reducing the cost of preparation, as well as the ease of preparation of die attach pastes containing electrically conductive filler and polycyanate ester monomer. The incorporation of alkylphenol into die-attach paste compositions has been found to be unnecessary, due to the presence of catalytically active species on the surface of filler flake employed in the preparation of such pastes. Indeed, it is desirable to eliminate alkylphenols from die-attach paste compositions because alkylphenols are acidic species that do not become incorporated into the final polymerized matrix of the cured attach paste. These acidic species can thus leach out, leaving voids in the cured composition and causing corrosion of sensitive electronic parts which come in contact therewith. Optional treatment of filler to render it free of catalytically active metal ions significantly extends the pot life of the composition.

Solvent free die-attach compositions

In accordance with the present invention, there is provided a novel composition for attaching a semiconductor device to a substrate. The invention composition comprises liquid polycyanate ester monomer, electrically conductive filler rendered substantially free of catalytically active metal ions and a curing catalyst. Treatment of filler to render it free of catalytically active metal ions significantly extends the pot life of the composition.

Die-attach composition comprising polycyanate ester monomer

Trans-1,4-polybutadiene is a thermoplastic resin rather than a rubber at room temperature by virtue of its high degree of crystallinity. Because trans-1,4-polybutadiene contains many double bonds in its backbone, it can be blended and cocured with rubbers. It is accordingly an attractive alternative to conventional fillers such as carbon black, which are typically utilized in compounding rubber. By utilizing the catalyst system and techniques of this invention, trans-1,4-polybutadiene can be synthesized at a high level of conversion. This invention specifically relates to a process for the synthesis of trans-1,4-polybutadiene by an anoinic polymerization process which comprises: (a) adding an organolithium compound and an alkali metal alkoxide as a catalyst system to a polymerization medium containing 1,3-butandiene monomer and an organic solvent; and (b) allowing the 1,3-butandiene monomer to polymerize at a temperature which is within the range of about -10.degree. C. to about 45.degree. C. to produce the trans-1,4-polybutadiene.

Polymerization of 1,3-butadiene to trans-1,4-polybutadiene with

Trans-1,4-polybutadiene is a thermoplastic resin rather than a rubber at room temperature by virtue of its high degree of crystallinity. Because trans-1,4-polybutadiene contain many double bonds in its backbone, it can be blended and cocured with rubbers. It is accordingly an attractive alternative to conventional fillers such as carbon black, which are typically utilized in compounding rubber. By utilizing the catalyst system and techniques of this invention, trans-1,4-polybutadiene can be synthesized at a high level of conversion. This invention specifically relates to a process for the synthesis of trans-1,4-polybutadiene by an anionic polymerization process which comprises: (a) adding an alkali metal trialkylmagnesiate and an alkali metal alkoxide as a catalyst system to a polymerization medium containing 1,3-butadiene monomer and an organic solvent; and (b) allowing the 1,3-butadiene monomer to polymerize at a temperature which is within the range of about -10.degree. C. to about 50.degree. C. to produce the trans-1,4-polybutadiene.

Process and catalyst system for synthesizing trans-1,4-polybutadiene

It has unexpectedly been discovered that 1-(1-isocyanato-1-methylethyl)-3-(1-methylethenyl) benzene(m-TMI) can be emulsion copolymerized with other monomers into useful polymers. For example, it has been found that m-TMI can be emulsion copolymerized with diene monomers to produce polymers which contain pendant isocyanate groups. Such pendant isocyanate groups are useful in a variety of applications. For instance, such pendant isocyanate groups can be utilized as sites to which chemical agents, such as antidegradants, can be bound to the polymer. Elastomers which contain such pendant isocyanate groups are of value since they can be crosslinked without employing sulfur. Elastomers of this type which contain pendant isocyanate groups can also potentially be thermo-reversibly crosslinked.

Preparation of polymers containing pendant isocyanate groups and

A process for the emulsion copolymerization of functionalized monomers wherein the improvement comprises the use of dichloromethane or tetrahydrofuran as a cosolvent and elevated soap levels in the polymerization.

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Palmdale, CA, United States of America

Dennis B Patterson