Mitsui Toatsu Chemicals, Incorporated

Mitsui Chemicals, Inc.

Yamamoto Chemicals, Inc.

Other

Tadashi Koike

Sumio Hirose

Yuji Inatomi

Tsutami Misawa

Akira Ogiso

Hisashi Tsukahara

Keiji Ueno

Shigeru Takahara

Takeshi Tsuda

Taizo Nishimoto

Hideki Umehara

Shin Aihara

Shinobu Inoue

Hiroshi Ozawa

Kenji Abe

Yoichi Hosono

Tadahiko Mizukuki

Tomoyoshi Sasakawa

Nobuhisa Kitagawa

Ryousuke Nara

Norihiko Mihara

Tsutomu Ishida

Koji Inoue

Yuko Suzuki

Akihiro Koide

Shinichi Murakami

Hiroyuki Hyakutake

Hiroyoshi Shiozaki

Kouichi Shiina

Shunsuke Murayama

An optical recording medium containing one or more compounds selected from imide compounds having a metallocene residue in a recording layer and an imide compound represented by a general formula (1): wherein a ring AR represents a substituted or unsubstituted aromatic ring residue or a residue formed by combining two or more aromatic ring residues via one or more linking groups; n represents the number of imide groups bonded to the ring AR; Arepresents any one of substituents Ato Abonded to a nitrogen atom of each imide group; and m represents an integer of from 1 to n, with the proviso that at least one substituent selected from the group consisting of Ato Ais one having at least one substituted or unsubstituted metallocene residue.

Imide compound and optical recording media made by using the same

An optical information recording medium is here disclosed which comprises a transparent substrate, a recording layer comprising an organic dyestuff on which information can be written by a laser beam, a reflective layer and a protective layer formed in this order on the substrate, the aforesaid optical information recording medium being characterized by containing a pit-edge control agent for the formation of recording pits, particularly a dyestuff thermal decomposition accelerator in the recording layer. By the addition of the pit-edge control agent, deviation properties and jitter properties can be remarkably improved, whereby a CD-R medium having a low error rate and good recording properties can be provided. In consequence, stable compatibility with a commercial CD player can be secured.

Optical information recording medium and composition for optical information recording film

An optical recording medium having a recording layer which contains at least one compound selected from the group consisting of mono-, di-, and triazaporphyrin compounds optionally in the form of a metal complex; or an optical recording medium comprising a substrate and formed thereon at least a recording layer containing an organic dye as a main component, characterized in that the organic dye has a first maximum value of absorption at a wavelength &#x3bb;of 400 nm or less in the absorption spectrum and has a second maximum value of absorption at a longer-wavelength side than the &#x3bb;, and a wavelength band wherein the refractive index (n) and the absorption coefficient (k) of the above organic dye satisfy n&#x2267;1.90 and 0.03&#x2266;k&#x2266;0.30.

Optical recording medium and novel azaporphyrin compounds

Optical recording medium

A recordable optical recording medium of this invention capable of good recording and reproduction with a laser at wavelengths of 300 to 500 nm and/or 500 to 700 nm comprises at least one porphycene compounds optionally chelated with a metal in its recording layer.

Optical recording medium and porphycene compound

An optical recording medium comprising a recording and a metal reflective layers on a transparent substrate having a groove, wherein the recording layer comprises an azaporphyrin metal complex dye with 1 to 4 meso-nitrogen atoms as a main component; recording and/or reproduction can be conducted using laser beams with wavelengths of &lgr;1 and &lgr;2 which is shorter than &lgr;1; a refractive index n of the recording layer is 2.0 or more at &lgr;1 and 1.8 or more at &lgr;2 as well as an attenuation coefficient k of the layer is 0.04 to 0.20 at &lgr;1 and 0.30 or less at &lgr;2; and the groove has a pitch of 0.70 to 0.85 &mgr;m, a half-value width of 0.20 to 0.35 &mgr;m and an inclination angle of 45 to 65&deg;:

Optical recording information medium

Dipyrromethene-metal chelate compound and optical recording medium using thereof

An optical information recording medium is here disclosed which comprises a transparent substrate, a recording layer comprising an organic dyestuff on which information can be written by a laser beam, a reflective layer and a protective layer formed in this order on the substrate, the aforesaid optical information recording medium being characterized by containing a pit.multidot.edge control agent for the formation of recording pits, particularly a dyestuff thermal decomposition accelerator in the recording layer. By the addition of the pit.multidot.edge control agent, deviation properties and jitter properties can be remarkably improved, whereby a CD-R medium having a low error rate and good recording properties can be provided. In consequence, stable compatibility with a commercial CD player can be secured.

Optical information recording medium and composition for optical

An optical information recording medium is here disclosed which comprises a transparent substrate, a recording layer comprising an organic dyestuff on which information can be written by a laser beam, a reflective layer and a protective layer formed in this order on the substrate, the aforesaid optical information recording medium being characterized by containing a pit.edge control agent for the formation of recording pits, particularly a dyestuff thermal decomposition accelerator in the recording layer. By the addition of the pit.edge control agent, deviation properties and jitter properties can be remarkably improved, whereby a CD-R medium having a low error rate and good recording properties can be provided. In consequence, stable compatibility with a commercial CD player can be secured.

An optical recording medium for pit length recording with excellent error rate and jitter value which has a transparent injection molded resin substrate, a recording layer containing a phthalocyanine dye of formula (1) overlying the substrate and a covering layer overlying the recording layer. Also, a method of optical recording by pit length recording with a focused laser beam using an optical recording medium as described above.

Optical recording medium and recording method

An optical recording medium of a single plate type capable of recording comprises a transparent resin substrate having a groove of 900-1800 .ANG. in depth and 0.3-0.6 .mu.m in width, a recording layer containing a dye overlying the substrate, a reflective layer overlying the recording layer and a protective layer overlying the reflective layer, the thickness of the recording layer being 800-1250 .ANG. at the groove portion and 500-1100 .ANG. at the land portion.

An optical recording medium of a single plate type comprises a substrate having a groove, a recording layer containing a dye overlying the substrate, a reflective layer overlying the recording layer and a protective layer overlying the reflective layer, wherein the recording layer is formed by a spin-coating method and the dimension of the groove varies from the center portion of the substrate toward the outer periphery thereof.

An optical recording medium of a single plate type comprises a substrate, a recording layer overlying the substrate, a reflective layer overlying the recording layer, and a protective layer overlying the reflective layer, the recording layer being produced by coating a nonpolar solvent-soluble substituted phthalocyanine dye in a nonpolar solvent and the nonpolar solvent content of in the recording layer being 5% by weight or less.

Disclosed are optical recording media, each of which is composed of a substrate and a recording layer formed on the substrate. The recording layer includes an organic-dye-containing layer and an organopolysiloxane resin layer formed by the condensation of a trifunctional silane represented by R.sup.1 Si(OR.sup.2).sub.3-n (X).sub.n and a tetrafunctional silane represented by Si(OR.sup.3).sub.4-m (X).sub.m, wherein R.sup.1, R.sup.2 and R.sup.3 individually represent an alkyl or aryl group, X a hydroxyl group or a halogen atom, and n and m 0, 1, 2 or 3 and 0, 1, 2, 3 or 4, respectively.

Optical recording media

Disclosed are optical recording media, each of which is composed of a substrate and a recording layer formed on the substrate. The recording layer includes an organic-dye-containing layer and an organopolysiloxane resin layer formed by the condensation of a trifunctional silane represented by R.sup.1 Si(Or.sup.2).sub.3-n (X).sub.n and a tetrafunctional silane represented by Si(OR.sup.3).sub.4-m (X).sub.m, wherein R.sup.1, R.sup.2 and R.sup.3 individually represent an alkyl or aryl group, X a hydroxyl group or a halogen atom, and n and m 0, 1, 2 or 3 and 0, 1, 2, 3 or 4, respectively.

Growing community of inventors

Chiba, Japan

Tadashi Koike