摘要:
Copolymers of a mono(cyclobutarene) comonomer and a polymaleimide comonomer are described. These copolymers have higher thermal stability and lower water absorption than polymaleimide homopolymers. They are useful in applications such as electronics, membranes, composities, coatings, and adhesives. Examples of such copolymers are those formed from the comonomers 1,1'-(methylenedi-4,1-phenylene)bismaleimide, and 3-(1-(4-methylphenyl)ethenyl)-bicyclo(4.2.0)octa-1,3,5-triene or 3-(2-(4-methylphenyl)ethenyl)-bicyclo(4.2.0)octa-1,3,5-triene.
摘要:
Copolymers comprising, in polymerized form, a 1,1-substituted arylethylene comonomer and at least one polymaleimide comonomer, are prepared using a system that provides a reduced onset of polymerization temperature thereby allowing removal of the copolymer from the mold after a preliminary curing period followed by transfer to an oven, a less expensive piece of equipment, for additional curing; thus making the mold, a more expensive piece of equipment, available for the next polymerization run.
摘要:
This invention is directed to a class of arylcyclobutene monomers having the general formula: ##STR1## wherein Ar is aromatic, with the proviso that the carbons of the cyclobutene rings are bonded to adjacent carbon atoms on the same aromatic ring of Ar;and R.sup.1 is a divalent alkyl, cycloaliphatic, aromatic, heteroaromatic, or heterocyclic moiety;polymeric compositions containing these monomers; and articles containing said polymeric compositions.
摘要:
The invention comprises cyclobutarene ketoaniline monomers and the process for preparing them. The monomers can be used to graft and/or endcap a monomer or polymer having at least 1 amino-reactive functionality. The grafted and/or endcapped monomer or polymer can subsequently be processed to prepare a highly crosslinked network.The preferred monomer has the formula: ##STR1##
摘要:
The invention comprises cyclobutarene ketoaniline monomers and the process for preparing them. The monomers can be used to graft and/or endcap a monomer or polymer having at least 1 amino-reactive functionality. The grafted and/or endcapped monomer or polymer can subsequently be processed to prepare a highly crosslinked network. Said monomers have the formula: ##STR1## as a preferred embodiment.
摘要:
Prepare a multimodal thermoplastic polymer foam having a distribution of large and small cells in a substantial absence of water by using a blowing agent stabilizer. Multimodal foams of the present invention have blowing agent stabilizer predominantly located proximate to large cells. The resulting multimodal foams have particular utility as thermal insulating materials.
摘要:
The invention is a bis-BCB compound of the structure: ##STR1## a method for making same and polymers made therefrom. The novel compounds of this invention are useful in preparing polymers that can form thin film coatings for multichip midules (MCMs) and integrated circuits (ICs). These compounds can be isolated as liquids at room temperature, and can form polymers that are hydrophobic and have low dielectrical and dissipative properties.
摘要:
A method of forming an air gap within a semiconductor structure by the steps of: (a) using a sacrificial polymer to occupy a space in a semiconductor structure; and (b) heating the semiconductor structure to decompose the sacrificial polymer leaving an air gap within the semiconductor structure, wherein the sacrificial polymer of step (a) is: (a) a copolymer of 5-ethylidene-2-norbornene and vinylbenzocyclobutene (or a vinylbenzocyclobutene derivative); or (b) a copolymer of 5-ethylidene-2-norbornene and 5-(3benzocyclobutylidene)-2-norbornene; or (c) a polymer of 5-(3benzocyclobutylidene)-2-norbornene. In addition, a semiconductor structure, having a sacrificial polymer positioned between conductor lines, wherein the sacrificial polymer is: (a) a copolymer of 5-ethylidene-2-norbornene and vinylbenzocyclobutene (or a vinylbenzocyclobutene derivative); or (b) a copolymer of 5-ethylidene-2-norbornene and 5-(3benzocyclobutylidene)-2-norbornene; or (c) a polymer of 5-(3benzocyclobutylidene)-2-norbornene.
摘要:
The invention is a compound which comprises an unsaturated cyclic imide moiety and an aryl cyclobutene moiety, wherein the cyclobutene moiety is fused to the aryl radical, and wherein the imide nitrogen is connected to the aryl radical by a direct bond or a bridging member. Another aspect of this invention is a polyimide polymeric composition which results from the polymerization of the above-described compounds.