Nissan Chemical Industries Limited

Takayuki Tamura

Hideo Suzuki

Isao Hashiba

Kentaro Ohmori

Kazuya Ebara

Hiroyuki Kousaka

Yoshikazu Ootsuka

A method for manufacturing a polyhydroxyamide resin (A) containing no chloride includes reacting a coumarin dimer component of Formula (19), where R, R, R, R, Rand Rindependently represent an alkyl group having 1 to 10 carbon atom(s), a halogen atom, a nitro group, an amino group, a cyano group, a carboxy group, an alkoxycarbonyl group having 1 to 10 carbon atom(s), a halogenated alkyl group having 1 to 10 carbon atom(s) or a hydroxy group, and a dimamine in a polar solvent.

Positive photosensitive resin composition and polyhydroxyamide resin

There is provided a one-step process for producing a dihydroxy-substituted coumarin dimer compound by a photodimerization reaction of a hydroxy-substituted coumarin compound. The process comprises subjecting a hydroxy-substituted coumarin compound to a photodimerization reaction in a solvent selected from aliphatic ketones having 3 to 10 carbon atoms, aliphatic carboxylic acid esters having 2 to 10 carbon atoms, aliphatic alcohols having 1 to 10 carbon atoms, aliphatic nitriles having 2 to 10 carbon atoms, ethers having 4 to 10 carbon atoms, amides having 3 to 10 carbon atoms, and a mixture thereof to obtain a dihydroxy-substituted coumarin dimer compound.

Process for production of coumarin dimer compound

A polyamic acid comprising at least 10 mol % repeating units represented by the formula [1] or [2]; and a polyimide represented by the formula [3] or [4] which is obtained from the polyamic acid. A polyimide film having high heat resistance and satisfactory in light-transmitting properties and tensile strength is obtained from the polyamic acid. (In the formulae, Rand Reach independently represents hydrogen or Calkyl; Rand Reach independently represents hydrogen, halogeno, Calkyl, or phenyl or the Rand Ron adjoining carbon atoms are bonded to each other to form Ccycloalkyl or phenyl; Rrepresents a divalent organic group; and n is an integer of 2 or larger.)

Polyamic acid and polyimide

Disclosed are a polyamic acid containing not less than 10 mol % of a repeating unit represented by the formula [1] below, and a polyimide represented by the formula [2] below which is obtained from such a polyamic acid. The polyamic acid and polyimide have high heat resistance as shown by a thermal decomposition temperature of not less than 300&#xb0; C. In addition, the polyamic acid and polyimide have good workability because of their high solubility in solvents, while exhibiting good light transmission. (In the formula, Rand Rindependently represent a hydrogen atom or an alkyl group having 1 to 10 carbon atoms; Rand Rindependently represent a hydrogen atom, a halogen atom, an alkyl group having 1 to 10 carbon atoms or a phenyl group, or alternatively Rand Ron adjacent carbon atoms may combine together to form a cycloalkyl group having 3 to 8 carbon atoms or a phenyl group; Rrepresents a divalent organic group; and n represents an integer of not less than 2.) 

A process which comprises reacting a 1,2,3,4-cyclobutanetetracarboxylic-1,2:3,4-dianhydride [1] with an alcohol [2] in the presence of an acid catalyst to obtain a compound [3], isomerizing the compound [3] with a base catalyst into a compound [4], reacting the compound [4] with an organic acid to obtain a compound [5], and reacting the compound [5] with a dehydrating agent to obtain a 1,2,3,4-cyclobutanetetracarboxylic-1,3:2,4-dianhydride: wherein Rand Rare each independently hydrogen, halogeno, alkyl of 1 to 10 carbon atoms, halogenated alkyl of 1 to 10 carbon atoms, cycloalkyl of 3 to 8 carbon atoms, phenyl, or cyano; and Ris alkyl of 1 to 10 carbon atoms. 

Cage-shaped cyclobutanoic dianhydrides and process for production thereof

The present invention provides a process for preparing N-methylated melamines in simple steps by using inexpensive raw materials in such a manner that the proportion of mono-type, bis-type and tris-type of the N-methylated melamines as prepared can be controlled. The process comprises reacting by heating melamine with methylamine in the presence of an acidic catalyst under pressure to substitute at least one amino group of the melamine by methylamino group.

Growing community of inventors

Funabashi, Japan

Takayuki Tamura