Nitto-denko Corporation

Bend Research, Inc.

Nitto Electric Industrial Co., Ltd.

Fuji Yakuhin Kogyo Kabushiki Kaisha

Nitto Denko Co. Ltd.

Yasuo Ninomiya

Yoshikazu Musa

Chiaki Komamura

Richard W Baker

Yoichi Kainoh

Kenji Mori

Shuji Senda

Tetsuo Omata

Tadashi Takeuchi

Miklos Toth

Masakazu Aburatani

Hans-Rudolf Buser

Heinrich Arn

The present invention provides mainly (3Z,6Z)-cis-9,10-epoxy-1,3,6-heneicosatriene (formula 1) and (3Z, 6Z)-cis-9,10-epoxy-1,3,6-elcosatriene (formula 2) which are Hyphantria cunea sex pheromones. The invention provides attractant components having high attraction effect for Hyphantria cunea, that is, Hyphantria cumea sex pheromones having high attraction activity and the intermediates which can selectively synthesize such pheromones with great ease. Furthermore, the invention provides attractant compositions with high attraction effect for Hyphantria cunea including such above noted pheromones. Consequently, this invention is completed. ##STR1##

Hyphantria cunea sex pheromones and attractant compositions including

A liquid active substance-containing membrane having an anisotropic structure comprising (a) a polymeric cellular layer containing a myriad of minute closed cells and septa thereof and (b) a dense thin layer covering the surface of the cellular layer, wherein the minute cells contain therein a liquid active substance having a limited solubility in the polymer at normal temperature. The membrane of the present invention can be advantageously used to release a liquid active substance such as pheromones and pesticides at a substantially constant, controlled rate over a long period of time.

Membrane containing a liquid active substance and process for the

There is disclosed an improved complex coacervation process for microencapsulation of core ingredients that are partially soluble in the microcapsule walls wherein the core ingredient is first mixed with a coacervation adjacent prior to forming a first colloidal emulsion of core ingredient, and, after combining the first emulsion with a second colloidal solution and cooling to cause gelation, a water-soluble wax derivative is added. No pH adjustment or dilution is necessary, and very high yields of non-agglomerated microcapsules are obtained, both in terms of quantity of microcapsules and content of core ingredient. When deet is the core ingredient there is obtained a long-lasting mosquito repellent.

Microcapsules prepared by coacervation

A process for producing a microcapsule containing a liquid active material is described, comprising the steps of:

Process for producing a microcapsule containing a liquid active material

A dispenser for active ingredients is disclosed which provides zero-order rate of release of essentially all of the active ingredients. The dispenser comprises a rate-controlling membrane and a solid microporous polymeric reservoir having interconnected or continuous pores capable of retaining the active ingredient by capillary forces, the reservoir being such that the active ingredient is essentially insoluble therein.

Controlled-release dispenser

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Osaka, Japan

Yasuo Ninomiya