Fuji Photo Film Company, Limited

Kazuko Hanai

Masatoshi Takahashi

Katsumi Ryoke

Eiichi Tadokoro

Nobutaka Yamaguchi

Hideaki Kosha

Yasuyuki Yamada

Tsutomu Okita

Akira Ushimaru

Hiroshi Hashimoto

Takahito Miyoshi

Akihiro Matsufuji

Kazuo Kato

Hiroaki Takano

Masaaki Fujiyama

Masashi Ogawa

Hiroo Inaba

Keiichi Suzuki

Tatsuya Yamada

Yasuo Nishikawa

Takashi Yoneyama

Noburo Hibino

Kenichi Masuyama

Akihiro Hashimoto

Hideomi Watanabe

Yuzo Higaki

Hiroshi Arakatsu

Toshihisa Ito

Nobuo Aoki

Mikio Ono

An object of the present invention is to provide a method which comprises adhering a biological sample to a film, cutting out a target area of the sample, and then peeling off the film to collect the fragment which was cut out, wherein the operability is good and a cutting sharpness in cutting by a laser beam is good. The present invention provides a method for cutting a biological sample by light irradiation, which comprises locating the biological sample and a colored film having a thickness of 3 to 6 &mgr;m onto one side of a support, and irradiating the biological sample with a light beam, thereby cutting out a target area of the biological sample.

Method for cutting a biological sample and a device used therefor

A magnetic recording medium comprises: a support; and at least one magnetic layer comprising a binder and a ferromagnetic alloy powder including Fe, wherein the magnetic recording medium has a surface scratch depth of 370 nm to 460 nm, and has a surface lubricant index of 4 to 11.

Magnetic recording medium

An abrasive tape comprises a substrate and an abrasive layer, which is overlaid on the substrate and is constituted of fine abrasive grains and a binder, wherein the abrasive layer contains an alkyl sulfosuccinic acid salt ester. The abrasive tape gives little scratching and little chipping to materials to be abraded and has a sufficiently high abrasive powder.

Abrasive tape

A magnetic recording medium comprising a nonmagnetic support and a magnetic layer, wherein the magnetic layer is provided on one surface of the nonmagnetic support, comprises a ferromagnetic particle, and has a surface roughness of from 2 to 10 nm; the nonmagnetic support has plural layers; at least one layer of the plural layers comprises an antistatic agent; and the nonmagnetic support has a surface roughness of from 5 to 30 nm on the opposite surface to the surface on which the magnetic layer is provided.

Disclosed is a magnetic recording medium comprising, a non-magnetic support having thereon (i) a lower non-magnetic layer comprising a non-magnetic powder and a binder, and (ii) an upper magnetic layer comprising a ferromagnetic powder and a binder, wherein an extract, obtained by extracting with tetrahydrofuran the binder present in the area between the outer surface of the upper magnetic layer and a position 0.1 .mu.m in depth from the outer surface, has a weight-average molecular weight of 15,000 or more, and wherein the reaction ratio of the curing agent reacted with the binder in the area between the outer surface of the upper magnetic layer and a position 0.1 .mu.m in depth from the outer surface is at least 1.3 times as much as the reaction ratio of the curing agent reacted with the binder containing a polyurethane in the lower nonmagnetic and upper magnetic layers as a whole. Also disclosed is a process for making this magnetic recording medium.

Magnetic recording medium and process for preparing the same

A magnetic recording medium comprising a subbing layer provided between a nonmagnetic plastic support and at least one of a magnetic layer and a backing layer, the magnetic layer and the backing layer each having a void of 40% by volume or less, and the subbing layer having higher solubility in a 0.5 wt % alkaline aqueous solution at 40.degree. C. than that in water at 40.degree. C. and being soluble in a weak alkaline aqueous solution having an initial pH of less than 13 or a low concentration alkaline aqueous solution having 0.25N or less. The subbing layer comprising a polymer containing acidic polar groups, and the subbing layer being soluble in a weak alkaline aqueous solution having an initial pH of less than 13 or a low concentration alkaline aqueous solution having 0.25N or less. A process for recovery and processing of a magnetic recording medium, the process comprising the steps of: (1) cutting a magnetic recording medium comprising a nonmagnetic plastic support having thereon a magnetic layer and/or a backing layer each having a void of 40% by volume or less; (2) dipping pieces of the magnetic recording medium in a weak alkali having an initial pH of less than 13 or a low concentration alkaline aqueous solution having 0.25N or less with stirring so that a subbing layer in the pieces having higher solubility in an alkaline aqueous solution than that in water is dissolved therein to peel off the magnetic layer and/or the backing layer from the nonmagnetic plastic support, and (3) separating the magnetic layer and/or the backing layer from the nonmagnetic plastic support.

Magnetic recording medium having specific subbing layers and process for

A magnetic recording medium high in storage stability and excellent in running properties and durability over a wide range of temperature and humidity, which comprises a non-magnetic support having a magnetic layer formed thereon, in which the magnetic recording layer contains a tertiary branched chain fatty acid ester represented by the following general formula ( I ): ##STR1## wherein each of R.sup.1, R.sup.2 and R.sup.3 independently represents a hydrocarbon group having 1 to 18 carbon atoms, and R.sup.4 represents a hydrogen group having 1 to 24 carbon atoms, provided the total number of carbon atoms in the ester is 12 to 40.

Magnetic recording medium comprising a magnetic layer having

A magnetic recording medium comprising a non-magnetic support having thereon a multi-layer magnetic layer structure comprising ferromagnetic fine powder and a binder, wherein said multi-layer magnetic layer structure is formed by coating a first composition containing the ferromagnetic fine powder and a polyisocyanate compound on the non-magnetic support to form a first magnetic layer and coating a second composition containing ferromagnetic fine powder and an epoxy compound having at least one epoxy group or a coupling agent on said first magnetic layer to form a second magnetic layer, wherein coating of said second magnetic layer is conducted simultaneously with or after coating said first magnetic layer while said first magnetic layer is still in a wet state, by a simultaneous or successive multiple layered coating method.

Magnetic recording medium having multiple magnetic layers with specified

A magnetic recording medium comprising a non-magnetic support having provided thereon a magnetic layer comprising ferromagnetic fine powder uniformly dispersed in a binder, wherein the binder comprises at least one resin selected from the group consisting of a vinyl chloride resin and a urethane resin, said resin for the binder has a weight average molecular weight of about from 20,000 to 80,000 and contains a low molecular weight fraction having a weight average molecular weight of about 3,000 or less in an amount of about 3 wt. % or less based on the amount of the resin.

Magnetic recording medium having a vinyl-chloride resin and a urethane

An improved magnetic recording medium comprises a nonmagnetic support and a magnetic recording layer which comprises a ferromagnetic powder, a lubricant and an abrasive dispersed in a binder comprising a specific polyurethane resin and a specific vinyl chloride copolymer at a ratio (polyurethane resin:vinyl chloride copolymer) in the range of 15:85 to 90:10. The polyurethane resin has a polar group such as --COOM, --SO.sub.3 M, --OSO.sub.3 M and --PO(OM').sub.2, wherein M is hydrogen or an alkali metal atom, and M' is hydrogen, an alkali metal atom or a lower hydrocarbon group, one polar group being contained per 53,000 to 100,000 of the number-average molecular weight of the resin, and the vinyl chloride copolymer has one of the above-mentioned polar group, one polar group unit being contained per 10,000 to 100,000 of the number-average molecular weight of the copolymer. The recording layer contains a fatty acid ester lubricant having a low melting point, a carbon black having an average particle size of 90-150 .mu.m, and/or a .alpha.-alumina having a small average particle size.

A magnetic recording medium comprising a support having provided on one surface thereof a magnetic recording layer containing ferromagnetic particles dispersed in a binder and on the other surface thereof a backing layer, wherein said binder comprises a vinyl chloride/vinyl acetate copolymer reisn containing at least one group represented by formula (I) or (II): ##STR1## wherein X represents a --COO-- group, a --CONH-- group, or a --C.sub.6 H.sub.4 -- group; x represents an integer of from 1 to 10; R.sub.1, R.sub.2, and R.sub.3 each represents a hydrogen atom, an alkyl group having from 1 to 10 carbon atoms, or an alkyl derivative having from 1 to 10 carbon atoms, or R.sub.1, R.sub.2, and R.sub.3 may be combined to each other to form a heterocycric ring; and Y.sup..crclbar. represents a halogen atom, ClO.sub.4.sup..crclbar., or HgI.sub.3.sup..crclbar. ; or Y.sup..crclbar. is bound to R.sub.2, R.sub.2 represents an alkylene group having from 1 to 10 carbon atoms, and Y.sup..crclbar. represents a --COO.sup..crclbar. group, an --SO.sub.3.sup..crclbar. group, or an --OSO.sub.3.sup..crclbar. group.

A magnetic recording medium comprising a nonmagnetic support and a magnetic recording layer provided on said support, said magnetic recording layer comprising a ferromagnetic powder dispersed in a binder, which is characterized in that said binder comprises a polyurethane resin which has a repeating unit derived from diol having the formula (I); ##STR1## in which R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are the same or different from each other, each of R.sup.1, R.sup.2, R.sup.3 and R.sup.4 is any one of a hydrogen atom, a saturated or unsaturated aliphatic group having 1-5 carbon atoms, an aromatic group and a cyclic aliphatic group, and at least three substituents among R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are not hydrogen atoms; and l, m, n and p are independently integers of 1-3, 0-2, 1-3, and 1-3, respectively.

A magnetic recording medium is described, comprising a non-magnetic support having provided thereon a magnetic layer containing ferromagnetic fine particles dispersed in a binder including a polyurethane resin containing (1) as a main polymer chain a polyester polyol containing an alcoholic and acid components comprising at least one of (A) at least one alcoholic component selected from alicyclic divalent alcohol and aromatic divalent alcohol in an amount of 50 mol % or more based on the total amount of alcoholic components or (B) at least one acid component selected from alicyclic dicarboxylic acid and aromatic dicarboxylic acid in an amount of 50 mol % or more based on the total amount of acid components, and (2) at least one polyisocyanate selected from tolylene diisocyanate, diphenyl-methane-4,4'-diisocyanate, isophrorone diisocyanate, dicyclohexylmethane-4,4'-diisocyanate, and p-phenylene diisocyanate in an amount of 5 mol % or more based on the total amount of all alcoholic components and all acid components, and further containing (3) a polar group selected from --SO.sub.3 M, --CO.sub.2 M, and --PO.sub.3 M.sub.2, wherein M represents an H, Na, or K atom, in an amount of from 0.03 to 2 wt % based on the total amount of the polyurethane resin.

A magnetic recording medium comprising a non-magnetic support having provided thereon a magnetic layer being provided on one surface of the support and a backing layer being provided on the surface of the support opposite to said magnetic layer, the backing layer contains binder and non-magnetic particles comprised of (i) corbon black having an average particle size of 0.1 to 1.0 .mu.m and (ii) particles of abrasives having a Mohs' hardness of at least 6 and an average particle size of 1 .mu.m or less, with the non-magnetic particles in said backing layer being used in an amount of 40 to 300 parts by weight per 100 parts by weight of binder.

A magnetic recording medium is described, comprising a magnetic layer coated on one side of a non-magnetic support and a backing layer coated on the opposite side of the non-magnetic support, wherein the backing layer is provided after the magnetic layer has been subjected to calendering treatment and the backing layer comprises (i) non-magnetic particles including carbon black particles having an average particle diameter of from 0.1 to 1 .mu.m and (ii) a binder composition comprising from 50 to 95 wt % of a resin having a 100% modulus at 150 kg/cm.sup.2 or less based on the total weight of the binder composition, and the weight ratio of non-magnetic particles to binder composition contained in the backing layer is from 300/100 to 40/100.

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Kanagawa, Japan

Kazuko Hanai