Abstract: The invention relates to a process and apparatus for producing a foamed body that allows simple control of the dimensions and gives foamed body with the desired dimensions in a stable manner. According to the invention, P2 is pressure at the point where pressure in the die begins to fall after casting a molding material containing no blowing agent into the die, ?P2 is the amount of reduction in pressure in the die from P2, P3 is the minimum pressure between the time of casting a molding material containing a blowing agent into the die completely cast and the time of beginning to increase the pressure in the die, ?P3 is the amount of increase in pressure in the die from P3, and ?P4 is the sum of ?P2 and ?P3.

Abstract: Disclosed are oil-extended 1,2-polybutadiene containing an extender oil in a specific amount based on 1,2-polybutadiene and a production method thereof, and a composition further containing another (co)polymer, a foaming agent, a crosslinking agent, a softening agent and other additives. The resulting oil-extended 1,2-polybutadiene and the composition thereof has excellent functions characterizing conventional 1,2-polybutadiene and is further excellent in wear resistance, fluidity (processability), coloring properties (high distinctness of images), flexibility, attachability and the like, so that they can be applied to various formed articles, shoe sole materials and laminate having high performances.

Abstract: An objective of the present invention is to provide a composition for polishing pad that is excellent in formability, abrasion resistance and small in temperature dependence of Young's modulus and a polishing pad therewith. The composition for polishing pad of the present invention comprises a water-insoluble matrix and a water-soluble particle dispersed in the water-insoluble matrix. The water-insoluble matrix contains a crosslinked ethylene-vinyl acetate copolymer and/or a crosslinked 1,2-polybutadiene and each of these is contained by a prescribed amount against the total of the water-insoluble matrix.

Abstract: The invention relates to a process and apparatus for producing a foamed body that allows simple control of the dimensions and gives foamed body with the desired dimensions in a stable manner. According to the invention, P2 is pressure at the point where pressure in the die begins to fall after casting a molding material containing no blowing agent into the die, &Dgr;P2 is the amount of reduction in pressure in the die from P2, P3 is the minimum pressure between the time of casting a molding material containing a blowing agent into the die completely cast and the time of beginning to increase the pressure in the die, &Dgr;P3 is the amount of increase in pressure in the die from P3, and &Dgr;P4 is the sum of &Dgr;P2 and &Dgr;P3.