Agency of Industrial Science and Technology

Ministry of International Trade & Industry

Toda Kogyo Corporation

Director-general of Agency of Industrial Science and Technology

Hiro Matsuda

Masao Kato

Hachiro Nakanishi

Kazuo Nakayama

Shuji Okada

Yoshio Tanaka

Norihisa Kobayashi

Nanao Horiishi

Eishun Tsuchida

Minoru Ohsugi

Shigeru Takaragi

Nobuyuki Tamaoki

Atsushi Masaki

Alexander Parfenov

Yuji Orihashi

A rewritable, heat sensitive, color image recording medium having a pair of opposed substrate sheets at least one of which is transparent, and a heat sensitive layer interposed between the substrate sheets and containing a cholesteric liquid crystal compound having a molecular weight of not greater than 2,000 and a glass transition point of at least 35&deg; C. A color image is formed on the recording medium by varying imagewise the temperature of the heat sensitive layer from a first temperature to a second temperature such that the cholesteric liquid crystal compound assumes a cholesteric liquid crystal phase at at least one of the first and second temperatures. The image is fixed by rapidly cooling the recording medium to a temperature lower than the glass transition point of the cholesteric liquid crystal compound.

Rewritable, heat sensitive, color image recording medium and image recording method using same

Disclosed herein are polydiphenyldiacetylenes having the following repeating unit (III): ##STR1## (wherein R.sup.1 denotes a hydrogen atom or a methoxy group; R.sup.2 denotes a hydrogen atom, a methoxy group or a methylamino group; R.sup.3 denotes a hydrogen atom or a trifluoromethyl group; and R.sup.4 denotes a hydrogen atom or a trifluoromethyl group; provided that R.sup.1 is not a hydrogen atom when R.sup.2 is hydrogen atom, and R.sup.3 is not a hydrogen atom when R.sup.4 is hydrogen atom).

Polydiphenyldiacetylenes

A thickness determination method for organic films comprises the steps of: irradiating an organic film to be measured with x-rays at a certain angle of incidence, finding an angle of reflection at which the x-ray intensity reaches a peak, and finding the thickness of the film from the angle of this peak.

Method using x-rays to determine thickness of organic films

##STR1## (wherein R.sub.1 and R.sub.2 independently stand for at least one member selected from the class consisting of alkylene groups, substituted alkylene groups, cycloalkylene groups, substituted cycloakylene groups, arylene groups, and substituted arylene groups), is a novel diacetylene-nylon salt compound possessing two kinds of ability of solid-state polymerization, and two-dimensional macromolecular crystals are obtained by severally polymerizing the diacetylene moiety and the nylon salt moiety of the compound. A shaped article of hig rigidity is produced by filling a mold with the aforementioned salt and subjecting the salt in the mold to simultaneous application of heat and pressure.

Diacetylene-nylon salt compound and method for production of

##STR1## (wherein R.sub.1 and R.sub.2 independently stand for at least one member selected from the class consisting of alkylene groups, substituted alkylene groups, cycloalkylene groups, substituted cycloalkylene groups, arylene groups, and substituted arylene groups), is a novel diacetylene-nylon salt compound possessing two kinds of ability of solid-state polymerization, and two-dimensional macromolecular crystals are obtained by severally polymerizing the diacetylene moiety and the nylon salt moiety of the compound. A shaped article of high rigidity is produced by filling a mold with the aforementioned salt and subjecting the salt in the mold to simultaneous application of heat and pressure.

Cyanometallophthalocyanine crystals which are organic electroconductive crystals are produced by electrolysis of an electrolyte containing an alkali salt of dicyanometallophthalocyanine. Organic electroconductive crystals of better quality are produced by causing the cyanometallophthalocyanine crystals mentioned above to incorporate therein an electron accepting compound and an electron donating compound as doping substances.

Method for production of organic electroconductive crystals

Growing community of inventors

Tsukuba, Japan

Hiro Matsuda