Nippon Polyurethane Industry Co., Ltd.

Victor Company of Japan, Limited

Sony Corporation

Mitsuhiro Yoshida

Shin Konishi

Hiroshi Asai

Susumu Sato

Tadashi Kimura

Yutaka Ichinoi

Masashi Somezawa

Yoshinobu Ninomiya

Toshihide Kobayashi

Akira Hashimoto

Kensuke Tani

Seiki Suzuki

Masanori Shindo

Masahiko Turuta

Yutaka Isobe

Masatake Katagiri

Masashi Kanaya

Yukio Obuchi

Hisashi Nanno

Katsuhiko Sakurai

An adhesive composition for lignocellulose-type hot-pressed forms is disclosed which comprises (A) an organopolyisocyanate which is a polyisocyanate composed chiefly of from 20% by weight to 70% by weight of a diphenylmethane diisocyanate having two benzene rings in one molecule and from 80% by weight to 30% by weight of a diphenylmethane diisocyanate polynuclear condensate having at least three benzene rings in one molecule, and has a viscosity of 500 mPa&middot;s or less in the state of solid content&equals;100% by weight at 25&deg; C.; and (B) a wax emulsion prepared by emulsifying a wax (B1) which is a paraffin wax containing at least 80% by weight of a paraffin having 20 to 40 carbon atoms, and has a melting point of from 40&deg; C. to 100&deg; C., with an emulsifier (B2) which is an ethylene oxide polyaddition product of an aliphatic monoalcohol whose aliphatic chain has 14 to 20 carbon atoms. Also disclosed is a process for producing lignocellulose-type hot-pressed forms, using this adhesive composition. The adhesive composition has a good releasability from heating platens used in hot-press forming.

Adhesive composition for lignocellulose-type hot-pressed forms, and hot-pressed form production process using the same

A process is provided for producing a compression molded article of a lignocellulose type material by use of an organic polyisocyanate compound as a binder. The process comprises carrying out adhesion by use of the following components (A) an organic polyisocyanate, (B) an aqueous emulsion of a wax having a melting point ranging from 50.degree. C. to 160.degree. C., and (C) an organic phosphate ester derivative and optionally (D) water. The compression molded article can readily be released from the mold, and has excellent physical properties.

Process for producing compression molded article of lignocellulose type

A video signal reproduction or record/reproduction apparatus comprises a first playback circuit reproducing a normal video signal from a recording medium and outputting a reproduced normal video signal to a TV receiver, and a second playback circuit reproducing a high definition video signal from the recording medium and outputting a reproduced high definition video signal to the TV receiver. The type of a reproduced video signal is judged. When the judgement result indicates that the type of the reproduced video signal is a normal video signal, the first playback circuit is allowed to output the reproduced normal video signal to the TV receiver while the second playback circuit is enforced to mute the reproduced high definition video signal. In a disabled or transition period during which the type of the reproduced video signal cannot be judged, the first and second playback circuits select an output video signal on the basis of a judgement result judged immediately before such a disabled or transition period.

Video signal reproduction or record/reproduction apparatus

Whether or not a luminance signal or an HD input signal is input to a picture signal recording apparatus is detected, and a recording mode is determined according to the detection of the luminance signal in a recording mode determining unit. In cases where the luminance signal is detected, first and second color difference signals of the HD input signal are alternately deleted on every scanning line. Thereafter, the luminance signal pertaining to odd-numbered scanning lines and the first color difference signal are time-compressed and multiplexed on every scanning line, and the luminance signal pertaining to even-numbered scanning lines and the second color difference signal are time-compressed and multiplexed on every scanning line. In contrast, in cases where the luminance signal is not detected, a luminance signal and first and second color difference signals of a normal picture signal input to the apparatus are time-compressed and multiplexed on every scanning line. Thereafter, the signals multiplexed are recorded on a magnetic tape according to the recording mode. Therefore, even though the number of scanning lines in the HD input signal is higher than that in the normal picture signal, the first and second color signals can be recorded within a limited frequency band.

Picture signal recording/reproducing method and apparatus for

The present invention provides a curing agent comprising a polyisocyanate compound obtained from hexamethylene diisocyanate and containing not more than 0.5% by weight of hexamethylene diisocyanate monomer, 21 to 60% weight of uretidine dione dimer and 11 to 40% by weight of isocyanurate cyclic trimer, the uretidine dione dimer and the isocyanurate cyclic trimer being prepared from a product obtained by urethane modification of 0.5 to 15 mole % by mole of total isocyanate groups of the hexamethylene diisocyanate by a dihydric alcohol having at least two hydroxyl groups and a branched hydrocarbon group having 4 to 35 carbon atoms in the molecule, which the side chain hydrocarbon groups in the branched hydrocarbon group have 2 to 33 carbon atoms in total. The curing agent has a low viscosity and a good compatibility with a solvent, and can provides a polyurethane paint or adhesive composition having good curing property, drying property, adhesion strength and weathering resistance.

Polyisocyanate curing agent and paint and adhesive compositions

A curing agent for a two-component type polyurethane, containing as a main constituent a polyisocyanate derived from hexamethylene diisocyanate, the polyisocyanate having a viscosity of lower than 1,400 mP.a/25.degree. C. in substantially free from monomeric hexamethylene diisocyanate and a solvent, having a uretidine dione dimer content of more than 10%, and having an isocyanurate cyclic trimer content of less than 60%.

Polyisocyanate curing agent, and coating composition and adhesive

The thermoplastic polyurethane resin having a molecular weight larger than about 5,000 is obtainable by the polyaddition of a long chain diol (A) having a molecular weight ranging from about 500 to 3,000, an organic diisocyanate (C) and a short chain triol (D) having a molecular weight lower than about 500 and specified structures and, as desired, a short chain diol (B) having a molecular weight ranging from about 50 to 500, in specified ratios. The thermoplastic polyurethane resin provides particularly enhanced heat resistance and solvent resistance with improved dispersibility of a pigment or the like and other resins and favorable compatibility with a solvent or the like.

Thermoplastic polyurethane resins

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Oiso-machi, Japan

Mitsuhiro Yoshida