摘要:
A polyimide resin composition for molding, which comprises a polyimide resin and an aromatic bisimide compound and has a melt flowability and an excellent processability in addition to the heat resistance inherent in polyamide; a carbon fiber-reinforced polyimide resin composition which comprises a polyimide resin and carbon fibers coated with an aromatic bisimide compound and has excellent mechanical strengths; and novel bisimide compounds represented by general formula (I), which are very useful as the aromatic bisimide compounds in the above resin compositions, wherein X represents a direct bond, C₁ to C₁₀ divalent hydrocarbyl, hexafluoroisopropylidene, carbonyl, thio or sulfonyl; Y₁ to Y₄ represent each independently hydrogen, lower alkyl, lower alkoxy, chlorine or bromine; and R represents a divalent group selected from the group consisting of monocyclic aromatic groups, fused polycyclic aromatic groups, and nonfused polycyclic aromatic groups wherein aromatic groups are linked together directly or through cross-linking member(s).
摘要:
A readily melt processable polyimide obtained by reacting diamine represented by the formula :
wherein n is an integer of 1 or 2, with 3,3′,4,4′-diphenylethertetracarboxylic dianhydride and/or 4,4′-(p-phenylenedioxy)diphthalic dianhydride or a mixture of these tetracarboxylic acid dianhydrides and pyromellitic dianhydride in the presence of phthalic anhydride, is disclosed.
摘要:
Disclosed is a thermosetting resin composition which comprises a specific bismaleimide compound or polymaleimide and a specific aromatic diamine compound. It can be widely used for electrical and electronic parts, various structural parts, sliding parts and the like. The diamine is of formula
摘要:
This invention discloses high-temperature adhesives having a good light-transmittance and excellent high-temperature flowability which comprises polyimide having recurring units represented by the following formula (I) (where R is a tetra-valent radical selected from the group consisting of aliphatic radical having not less than two carbons, cyclo-aliphatic radical, monoaromatic radical, condensed polyaromatic radical, and non condensed polyaromatic radical wherein aromatic radicals are mutally connected with a bond or a crosslinking function). The ployimide is obtained by preparing polyamic acid through the reaction of 2,2-bis[4-(3-aminophenoxy)phenyl]-1,1,1,3,3,3,-hexafluoropropane as a diamine component with tetracarboxylic dianhydride such as pyromellitic dianhydride, 3,3ʹ,4,4ʹ-biphenyltetracarboxylic dianhydride, bis(3,4-dicarboxyphenyl) ether dianhydride and 3,3ʹ4,4ʹ-benzophenonetetracarboxylic dianhydride, and further conducting the ring-closing reaction of resultant polyamic acid by dehydration.
摘要:
A thermosetting resin composition formed of a polyaminobismaleimide resin, which is composed of a bismaleimide compound and a diamine compound, and a solid lubricant. The composition has low coefficient of friction and excellent wear resistance, and can be utilized for self-lubricating parts.
摘要:
This invention relates to molding resin compositions, and more particularly relates to polyimide resin compositions having markedly improved molding ability in addition to excellent high temperature stability, chemical resistance and mechanical strength. The polyimide resin composition of this invention consists of 99.9 to 50% by weight of the polyimide and 0.1 to 50% by weight of high temperature engineering polymer. The polyimide consists of recurring units of the following formula: wherein X is a sulfonyl radical or a carbonyl radical and R is a tetravalent radical selected from an aliphatic radical, alicyclic radical, monoaromatic radical, condensed aromatic radical and non-condensed aromatic radical. R is, for example, The high temperature engineering polymer is, for example, polyphenylene sulfide consisting of recurring units of the formula: aromatic polysulfone consisting of recurring units of the formula: or aromatic polyetherimide consisting of recurring units of the formula:
摘要:
Polyimide of this invention is almost colorless and has remarkably high light transmittance as well as excellent processability and adhesive properties at high temperatures in addition to its substantial high-temperature stability. The polyimide is a novel polyimide capable of being used for space and aeronautical materials, electric and electronic members, automotive parts, and furthermore for high-temperature adhesives. The polyimide has recurring units of the following formula (I): wherein X is a radical selected from the group consisting of a bond, divalent hydrocarbon radical having from 1 to 10 carbons, hexafluorinated isopropylidene radical, carbonyl radical, sulfonyl radical and thio radical, and each nitrogen atom of imide ring is located simultaneously at meta- or para-position to ether linkage. The polyimide of this invention is prepared by reacting 4,4ʹ-(p-phenylenedioxy)diphthalic dianhydride with an ether diamine having the following general formula (V): and successively imidizing the resultant polyamic acid.
摘要:
Novel thermoset polyimide and a composite materials comprising the thermoset polyimide and a fibrous reinforcement are prepared according to this invention. The thermoset polyimides are obtained by heat-treating a linear polyamic acid or a linear polyimide prepared by using 4,4'-bis(3-aminophenoxy)biphenyl and pyromellitic dianhydride as essential monomer or by adding 4,4'-diaminodiphenyl ether or 3,3',4,4'-biphenyltetracarbo xylic dianhydride to the essential monomers and by end-capping the molecular chain end with an aromatic dicarboxylic anhydride having a carbon-carbon triple bond. The thermoset polyimide of this invention has essential excellent properties of thermoplastic polyimide and additionally has enhanced heat resistance and improved mechanical properties. This invention can provide various kind of composite materials for aircraft matrix, electric and electronic appliances and others. A preferred polyimide is of formula: