Abstract: A process is disclosed, by which protein can be removed easily and efficiently from natural rubber latex so that deproteinized natural rubber latex can be produced with high productivity and low cost. Particularly, a process for the production of deproteinized natural rubber latex is disclosed, which comprises treating natural rubber latex with a proteolytic enzyme and a surfactant to decompose protein in natural rubber latex, washing the treated natural rubber latex in the presence of a salt. According to the process, deproteinized natural rubber latex useful as a counter-allergy material having stable qualities can be produced easily with high productivity and low cost.

Abstract: A method for producing a formed product of deproteinized natural rubber latex capable of reducing a content of an allergen in a natural rubber latex material to a level sufficient to keep the latex from being harmful to the human body without decreasing yields of the product and deteriorating formability of the latex. In the method, cleaning removal of a non-rubber content is carried out after each of protein decomposition, prevulcanization and forming. An aqueous alkali solution, ammonia, water containing free chlorine in an amount of 0.005 to 0.02% by weight or alcohol-water mixed liquid containing alcohol in an amount of 5 to 80% by weight is used as cleaning liquid for the cleaning removal. The method is suitably applied to production of a natural rubber product such as a rubber glove, a condom, a catheter, a foam rubber material and the like.

Abstract: A process is disclosed, by which protein can be removed easily and efficiently from natural rubber latex so that deproteinized natural rubber latex can be produced with high productivity and low cost. Particularly, a process for the production of deproteinized natural rubber latex is disclosed, which comprises treating natural rubber latex with a proteolytic enzyme and a surfactant to decompose protein in natural rubber latex, washing the treated natural rubber latex in the presence of a salt. According to the process, deproteinized natural rubber latex useful as a counter-allergy material having stable qualities can be produced easily with high productivity and low cost.

Abstract: This invention presents a rubber composition wherein a determined amount of protein is mixed with unvulcanized rubber. Rubber products made of this rubber composition have sufficient strength for practical use and are harmless to human bodies. The rubber composition of the invention not requiring vulcanizing process is advantageous in eliminating the need of large-scale vulcanizing equipment. Combined use of a curing agent and protein will increase modulus higher than using the curing agent alone.

Abstract: There are provided a deproteinized natural rubber latex which comprises a purified product of proteolytically treated natural rubber latex and contains fine particles of natural rubber latex, a deproteinized natural rubber which comprises a dehydrated product of the deproteinized natural rubber latex, and a process for the production of deproteinized natural rubber latex which comprises subjecting a latex solution prepared by (1) adding water and/or a surfactant to a natural rubber latex and then proteolytically treating the resulting latex solution or (2) proteolytically treating a natural rubber latex and then adding water and/or a surfactant to the treated natural rubber latex, to purification using a rotary plate membrane separation apparatus.

Abstract: A method for forming a shock resistant tool comprising reinforcing fiber used as a reinforcing material and cyclopentadiene resin used as matrix resin by reaction injection molding method. Cyclopentadiene resin is superior in shock resistant performance and has a low melt viscosity, thus allowing fiber to be contained in the shock resistant tool at a high percentage.

Abstract: A material for making marine structure comprises a rubber composition. The rubber composition contains a metal salt of .alpha., .beta.-unsaturated fatty acid and is vulcanized in a mold into a predetermined configuration. The strength of the rubber composition is anisotropic and in particular its elastic modulus is anisotropic. The direction in which the strength of the rubber composition is high is set in the direction in which stress is applied by waves. Thus, the marine-structural material is resistant to waves and tide. The rubber composition contains short fibers which are oriented in a certain direction to increase the anisotropy of the rubber composition.

Abstract: A golf ball having an improved low temperature impact resistance, which comprises a core and a cover made of a cover composition containing an ionic copolymer having at least two different metal ions in one molecule. The cover composition is prepared by kneading a sodium ion type ionic copolymer having free carboxyl groups and a metal oxide such as magnesium or zinc oxide at high temperatures, whereby the metal oxide is reacted with the ionic copolymer to incorporate the metal ion such as magnesium or zinc ion into the ionic copolymer.

Abstract: This invention is intended to provide a golf ball having good shot feeling and click properties, which is produced by impregnating a rubber thread-wound core with a latex containing within the range of 30 to 60% by weight the solid content of an Ionomer resin of ion-crosslinkages comprising mono-olefin and at least one unsaturated monocarboxylic or dicarboxylic acid or acid ester of three to eight carbon atoms, thereby to improve the integration between the core and the inner surface of the ball shell made of Ionomer resin of ion-crosslinkages to be covered over the latex covered core.