Abstract: A polyimide resin containing a repeating structural unit represented by the following formula (1) and a repeating structural unit represented by the following formula (2), a content ratio of the repeating structural unit of formula (1) with respect to the total of the repeating structural unit of formula (1) and the repeating structural unit of formula (2) being 20 to 70 mol %, and the polyimide resin having a chain aliphatic group having from 5 to 14 carbon atoms at an end thereof: wherein R1 represents a divalent group having from 6 to 22 carbon atoms containing at least one alicyclic hydrocarbon structure; R2 represents a divalent chain aliphatic group having from 5 to 16 carbon atoms; and X1 and X2 each independently represent a tetravalent group having from 6 to 22 carbon atoms containing at least one aromatic ring.

Abstract: A polyimide resin containing a repeating structural unit of the following formula (1), a repeating structural unit of the following formula (2), and a repeating structural unit of the following formula (A) or a repeating structural unit of the following formula (B), a content ratio of formula (1) with respect to the total of formula (1) and formula (2) being from 40 to 70 mol %, and a content ratio of formula (A) or formula (B) with respect to the total of formula (1) and formula (2) being more than 0 mol % and 25 mol % or less: wherein R1 represents a divalent group having from 6 to 22 carbon atoms containing at least one alicyclic hydrocarbon structure; R2 represents a divalent chain aliphatic group having from 5 to 20 carbon atoms; Ra represents a divalent group containing at least one aromatic ring which is bonded to a monovalent or divalent electron-attracting group; Rb represents a divalent group containing —SO2— or —Si(Rx)(Ry)O— wherein Rx and Ry each independently represent a chain aliphatic group

Abstract: [1] A polyimide resin composition containing a polyimide resin (A) and an additive (B), the polyimide resin (A) containing a repeating structural unit represented by the following formula (1) and a repeating structural unit represented by the following formula (2), a content ratio of the repeating structural unit of formula (1) with respect to the total of the repeating structural unit of formula (1) and the repeating structural unit of formula (2) being from 40 to 70 mol %; and [2] a composite material containing a fiber material (C) impregnated with a polyimide resin (A) containing a repeating structural unit represented by the following formula (1) and a repeating structural unit represented by the following formula (2), a content ratio of the repeating structural unit of formula (1) with respect to the total of the repeating structural unit of formula (1) and the repeating structural unit of formula (2) being from 40 to 70 mol %: wherein R1 represents a divalent group having from 6 to 22 carbon atoms

Abstract: A polyimide resin containing a repeating structural unit represented by the following formula (1) and a repeating structural unit represented by the following formula (2), a content ratio of the repeating structural unit of formula (1) with respect to the total of the repeating structural unit of formula (1) and the repeating structural unit of formula (2) being 20 mol % or more and less than 40 mol %, and the polyimide resin satisfying predetermined conditions: wherein R1 represents a divalent group having from 6 to 22 carbon atoms containing at least one alicyclic hydrocarbon structure; R2 represents a divalent chain aliphatic group having from 5 to 16 carbon atoms; and X1 and X2 each independently represent a tetravalent group having from 6 to 22 carbon atoms containing at least one aromatic ring.

Abstract: The present invention provides a polyimide resin composition capable of forming a film having heat resistance and transparency and, in addition thereto, mechanical strength, surface hardness and flex resistance, a polyimide resin, a polyimide film and a laminate. The present invention includes: a polyimide resin composition containing a polyimide resin that has structural units represented by specific structures in a specific ratio, containing silica fine particles; the polyimide resin; a polyimide film; and a laminate.

Abstract: A polyimide resin containing a repeating structural unit represented by the following formula (1) and a repeating structural unit represented by the following formula (2), a content ratio of the repeating structural unit of formula (1) with respect to the total of the repeating structural unit of formula (1) and the repeating structural unit of formula (2) being 20 to 70 mol %, and the polyimide resin having a chain aliphatic group having from 5 to 14 carbon atoms at an end thereof: wherein R1 represents a divalent group having from 6 to 22 carbon atoms containing at least one alicyclic hydrocarbon structure; R2 represents a divalent chain aliphatic group having from 5 to 16 carbon atoms; and X1 and X2 each independently represent a tetravalent group having from 6 to 22 carbon atoms containing at least one aromatic ring.

Abstract: The present invention provides a method for producing a polyimide resin powder, including the step of reacting (A) a tetracarboxylic acid component containing a tetracarboxylic dianhydride with (B) a diamine component containing an aliphatic diamine in the presence of (C) a solvent containing an alkylene glycol-based solvent represented by the formula (1): wherein Ra1 represents a hydrogen atom or an alkyl group having from 1 to 4 carbon atoms, Ra2 represents a linear alkylene group having from 2 to 6 carbon atoms, and n represents an integer of 1-3.

Abstract: A polyimide resin containing a repeating structural unit represented by the following formula (1) and a repeating structural unit represented by the following formula (2), a content ratio of the repeating structural unit of formula (1) with respect to the total of the repeating structural unit of formula (1) and the repeating structural unit of formula (2) being 20 mol % or more and less than 40 mol %, and the polyimide resin satisfying predetermined conditions; wherein R1 represents a divalent group having from 6 to 22 carbon atoms containing at least one alicyclic hydrocarbon structure; R2 represents a divalent chain aliphatic group having from 5 to 16 carbon atoms; and X1 and X2 each independently represent a tetravalent group having from 6 to 22 carbon atoms containing at least one aromatic ring.

Abstract: [1] A polyimide resin composition containing a polyimide resin (A) and an additive (B), the polyimide resin (A) containing a repeating structural unit represented by the following formula (1) and a repeating structural unit represented by the following formula (2), a content ratio of the repeating structural unit of formula (1) with respect to the total of the repeating structural unit of formula (1) and the repeating structural unit of formula (2) being from 40 to 70 mol %; and [2] a composite material containing a fiber material (C) impregnated with a polyimide resin (A) containing a repeating structural unit represented by the following formula (1) and a repeating structural unit represented by the following formula (2), a content ratio of the repeating structural unit of formula (1) with respect to the total of the repeating structural unit of formula (1) and the repeating structural unit of formula (2) being from 40 to 70 mol %: wherein R1 represents a divalent group having from 6 to 22 carbon atoms

Abstract: A polyimide resin containing a repeating structural unit of the following formula (1), a repeating structural unit of the following formula (2), and a repeating structural unit of the following formula (A) or a repeating structural unit of the following formula (B), a content ratio of formula (1) with respect to the total of formula (1) and formula (2) being from 40 to 70 mol %, and a content ratio of formula (A) or formula (B) with respect to the total of formula (1) and formula (2) being more than 0 mol % and 25 mol % or less: wherein R1 represents a divalent group having from 6 to 22 carbon atoms containing at least one alicyclic hydrocarbon structure; R2 represents a divalent chain aliphatic group having from 5 to 20 carbon atoms; Ra represents a divalent group containing at least one aromatic ring which is bonded to a monovalent or divalent electron-attracting group; Rb represents a divalent group containing —SO2— or —Si(Rx)(Ry)O— wherein Rx and Ry each independently represent a chain aliphatic group

Abstract: The present invention provides a method for producing a polyimide resin powder, including the step of reacting (A) a tetracarboxylic acid component containing a tetracarboxylic dianhydride with (B) a diamine component containing an aliphatic diamine in the presence of (C) a solvent containing an alkylene glycol-based solvent represented by the formula (1): wherein Ra1 represents a hydrogen atom or an alkyl group having from 1 to 4 carbon atoms, Ra2 represents a linear alkylene group having from 2 to 6 carbon atoms, and n represents an integer of 1-3.

Abstract: A thermoplastic polyimide resin containing a repeating structural unit represented by the following formula (1) and a repeating structural unit represented by the following formula (2), a content ratio of the repeating structural unit of formula (2) with respect to the total of the repeating structural unit of formula (1) and the repeating structural unit of formula (2) being from 40 to 70% by mol: wherein R1 represents a divalent group having from 6 to 22 carbon atoms containing at least one alicyclic hydrocarbon structure; R2 represents a divalent chain aliphatic group having from 5 to 12 carbon atoms; and X1 and X2 each independently represent a tetravalent group having from 6 to 22 carbon atoms containing at least one aromatic ring.

Abstract: A thermoplastic polyimide resin containing a repeating structural unit represented by the following formula (1) and a repeating structural unit represented by the following formula (2), a content ratio of the repeating structural unit of formula (1) with respect to the total of the repeating structural unit of formula (1) and the repeating structural unit of formula (2) being from 40 to 70% by mol: wherein R1 represents a divalent group having from 6 to 22 carbon atoms containing at least one alicyclic hydrocarbon structure; R2 represents a divalent chain aliphatic group having from 5 to 12 carbon atoms; and X1 and X2 each independently represent a tetravalent group having from 6 to 22 carbon atoms containing at least one aromatic ring.

Abstract: An optical transmitter can communicate at a transmission speed exceeding Gb/s with a low bit error rate. An optical transmission module includes a semiconductor module having a semiconductor laser and an impedance matching element, a driver circuit for driving the semiconductor laser to emit an optical signal, and an optical fiber for transmitting the optical signal. The impedance matching element matches an impedance of the semiconductor laser module to an impedance of the driver circuit. The optical transmission module includes an impedance element for reducing an input impedance of the semiconductor laser module as viewed from the driving circuit in order to reduce a fall time of the optical signal. Impedance matching elements and are added to remove possible mismatching between the module and the driver circuit caused by a manufacturing error and to improve the yield of the module.