Abstract: Subjects for the present invention are to provide a thickening agent for excavation stabilizing slurries which has excellent cement contamination resistance, is difficult to putrefy, and is prevented from bubbling, which may be problematic in construction works, and to provide an excavation stabilizing slurry containing the thickening agent and a cast-in-place underground pile method and an diaphragm wall construction method each using the slurry.

Abstract: The present invention provides a porous film obtained by coagulating polymer particles in an emulsion into the form of a film while maintaining their particle shape. The spaces between particles are left as pores, and as a result, the porous film has a plurality of thus-formed pores. By controlling the polymer particle diameter, the distribution of the particle diameter, and the solid concentration of the emulsion, the size of the pores of the film, the rate of pore area and the density of pores can be properly determined. The porous film is suitable for various applications including a recording subject for ink-jet printing, other recording subjects, films used in various industries, and the like.

Abstract: A novel cement admixture is provided which fulfills the function as a thickener basically, possesses an ability to inhibit segregation of materials, excels in workability as well, and permits a decrease in the amount of addition while keeping these functions intact. The cement admixture is characterized by comprising a cement additive formed of a polymer resulting from polymerizing a monomer mixture having methyl acrylate as a main component thereof and a cement water reducing agent.

Abstract: A ball joint having a ball stud provided with an integral spherical portion at one end thereof. A unitary molded synthetic resin body forms a molded holder having a concavity in which the spherical ball portion is tightly held disposed rotatable omnidirectionally and tiltable therein. The concavity has an opening of a lesser diameter than a maximum diameter of the concavity so that the spherical portion of the ball stud can be pressure-fitted into the concavity with the ball stud extending axially laterally of the molded holder. A link rod having a circular annular end held by the molded holder extends laterally of the holder defining in assembly with the ball stud a ball joint. The annular end is embedded in the synthetic resin of the molded holder and has an internal diameter substantially coaxial with the ball stud and greater than the diameter of ball stud spherical portion so that the synthetic resin concavity and the spherical ball portion have opposed smooth surfaces.

Abstract: A universal joint for coupling a pair of members with a connecting rigid link rockable about two sets of pivot axes. Each of the two members has a corresponding bolt hole through which extend respective stepped bolts defining two pivotal axes about which the link can pivot and rock. The link has opposite end portions each defining a loop through which extends a corresponding stepped bolt connecting a respective end of the link to a corresponding one of the two members the link couples. Each coupling bolt has a length with a major diameter extending axially through a respective coupled member and the corresponding loop of an end portion of the link to which it is coupled.

Abstract: An aqueous resin dispersion for a heat-sensitive recording material is disclosed. The aqueous resin dispersion is obtained by the use of polyvinyl alcohol as an emulsifier and the use of two steps of polymerization. In the first step of polymerization, a polymeric monomer composition A is polymerized, composition A containing polymeric multi-functional monomers which constitute 15% by weight or more of the total weight of the polymeric monomers used for the first step. And, in the second step, a polymeric monomer composition B is polymerized, The invention also discloses a heat-sensitive recording material using such an aqueous resin dispersion as a color-developing layer or a protective coating.

Abstract: A heat-sensitive recording material excelled in surface gloss and printing concentration is disclosed.The disclosed heat-sensitive recording material with a heat-sensitive color-developing layer formed on a supporting member features provision on the surface of the heat-sensitive color-developing layer of a protective coating containing crosslinked microfine particles (B) having substantially no glass transition temperature, 0.5 .mu.m or less in mean particle size and 0.05 or less in the difference in refractive index from the solid content of aqueous resin despersion which are obtainable by emulsion-polymerizing vinyl-containing monomers containing 15 weight % or more of polymeric multifunctional monomers together with the aqueous resin dispersion (A).