This invention relates to marine jet drive systems and, more particularly to marine jet drive systems which include or are retrofitted with a preloader for reducing cavitation. The invention also relates to such a preloader which may be retrofitted to a standard marine jet drive system. The invention further relates to a method for reducing cavitation during operation of a marine jet drive system. The preloader comprises a water propelling device mounted on a shaft and rotatable within an intake...

This invention provides a diene rubber capable of yielding a vulcanized rubber having improved heat build-up, tensile strength and abrasion resistance, processes for preparing the same, and rubber compositions containing the same. The diene rubber is composed of 40 to 99.99% by weight of conjugated diene monomer units, 0 to 50% by weight of aromatic vinyl monomer units, and 0.01 to 20% by weight of vinyl monomer units containing a tertiary amino group which is at least partially quaternized with...

A ferrielectric liquid crystal compound of the general formula (1), ##STR1## wherein R is a linear alkyl group having 6 to 12 carbon atoms, either each of X and Y is a hydrogen atom or one of X and Y is a hydrogen atom and the other is a fluorine atom, m is an integer of 1 to 2, n is 1 and C* is an asymmetric carbon. The above liquid crystal compound shows a ferrielectric phase in a wide temperature range and exhibits a fast response in spite of its small spontaneous polarization, and it is ther...

The present invention relates to a photochromic curable composition suited for the production of a photochromic cured product having excellent optical properties such as a high refractive index and a large Abbe's number, having favorable photochromic properties such as a large color density, and having good fatigue resistance, and to a photochromic lens obtained by curing the photochromic curable composition. The photochromic curable composition is characterized by comprising 100 parts by weight...

Provided are magnesium hydroxide particles having a hexagonal crystal form and having an aspect ratio (H) which satisfies the following expression (I), 0.45AB<H<1.1AB (I) (wherein H is an aspect ratio, A is an average secondary particle diameter (.mu.m) of all of the particles measured by a laser diffraction scattering method and B is a specific surface area (m.sup.2/g) of all of the particles measured by a BET method), a flame-retardant comprising the particles, a flame-retardant resin co...

A nail lacquer effective for the treatment or prevention of fungal infections, such as, onychomycosis, includes fungicidally effective amount of ciclopirox, econazole, or other antifungal agent in a clear, stable, film-forming lacquer vehicle which includes a water-insoluble film-forming polymer; 2-n-nonyl-1,3-dioxolane or similar penetration enhancer; and volatile solvent. A plasticizer for the film-forming polymer which is also compatible with the other components may be included although the ...

A hollow vessel for heat sterilization, which is superior in the transparency and in the impact resistance with scarce odor, made of a polyolefin resin having characteristic properties comprising an underwater light transmittance of 70-99% resulting from determination of light transmission at a wave length of 450 nm for a resin specimen of a thickness of 0.5 mm which has been subjected to a heat sterilization treatment with steam at a temperature of 121.degree. C. for 20 minutes; a tensile elast...

A rubber composition useful as a tire side wall or tire tread is formed from an unsaturated olefin copolymer (A) or (A') and diene rubber (B). Copolymers (A) and (A') are each obtained from (i) ethylene, (ii) aromatic vinyl compound, (iii) non-conjugated polyene, and, optionally (iv) alpha-olefin having at least 3 carbon atoms. When used in forming a tire side wall, copolymer (A) has a molar ratio of (i)/(iv) from 100/0 to 40/60; molar ratio of [((i)+(iv))/(ii)] from 98/2 to 60/40; an intrinsic ...

A heteroconjugate is formed by linking a T cell binding ligand (TCBL) such as Peptide J of .beta.-2 microglobulin to a modified HGP-30 antigentic peptide fragment of p17 gag peptide, such as, for example The heteroconjugate is effective in eliciting a THI directed immune response and provides a vaccine composition for treating or preventing AIDS.

In this transfer device, when a straight line is regarded to be a support axis P connecting a press-contacting point between the first roller and the drum to a press-contacting point between the second roller and the stopper, a moment of the resilient member of the second roller side to the support axis P is larger than the sum of a moment of the resilient member of the first roller side to the support axis P and a moment of the resilient means to the support axis P. Upon adjusting the moments a...