Sanyo Chemical Industries, Ltd.

Other

Yasushi Kumagai

Yuichi Sasatani

Akira Inoue

Tsuyoshi Tomosada

Kunikiyo Yoshio

Kengo Ozaki

Motonao Kaku

Tomokazu Shimizu

Toru Nakanishi

Tatsuroh Yanagi

Hajime Akiyama

Jiro Ryugo

Masamichi Taguchi

Kaoru Yamazaki

Sadao Kubota

Sukeo Ban

Honeycomb core material for sandwich structure and method for manufacturing the same

A polyurethane foam which is obtained by reacting an addition-polymerizable active hydrogen component comprising a compound having a group containing active hydrogen and an addition-polymerizable functional group or comprising both this compound and a compound containing at least 2.5 groups (on the average) containing active hydrogen and not containing addition-polymerizable functional groups with an organic polyisocyanate in the presence or absence of at least one auxiliary selected from the group consisting of foaming agents and additives to polymerize the addition-polymerizable functional group and simultaneously form a polyurethane, and which has a structure in which the chains formed by the addition polymerization have been cross-linked to the polyurethane chains. The polyurethane foam is useful as a rigid polyurethane foam excellent in hardness, dimensional stability, etc. and usable as a heat insulator, shock-absorbing material, synthetic wood, etc., or is useful as a soft polyurethane foam reduced in compression set and usable as a cushioning material, shock-absorbing material, sound insulating/absorbing material, etc.

Polyurethane foam, process for producing the same, and foam forming composition

Foamed polyurethanes substantially free from non-uniform density distribution are obtained by dispersing an inert gas with mechanical stirring into a foamed polyurethane-forming composition containing substantially no blowing agent and comprising (1) an organic polyisocyanate component, (2) a polyol component comprising a high molecular weight polyol (A1) and a low molecular weight polyol (A2), (3) a dehydrating agent (B) and optionally organic microballoons, and curing the resulting composition containing therein the inert gas substantially homogeneously distributed. Foamed polyurethanes thus obtained are lightweight and of reduced warpage after processing and are suitable for model materials.

Foamed polyurethane-forming composition, foamed polyurethane and process

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Kyoto, Japan

Yasushi Kumagai