In the blends of NBR/PVC, the properties of the blends of NBR, which have various acrylonitrile content, and PVC were studied.
It was found that the properties of vulcanizates (both sulfur-cure and peroxide-cure) of the blends consisting of various acrylonitrile content are similar to one another, except oil resistance. And the properties of them were in linear relation to the blend ratio of NBR/PVC.

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On the several typical stabilizers using generally for PVC, their effects to the stabilities for sun-light and heat, to the processibility and to the properties of vulcanizates of NBR/PVC blends were studied.
It was found that these effects for NBR/PVC are similar to the effects well-known for PVC.

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As a diene rubber having relatively small polarity, the polyisoprene rubber was selected, and various problems involved in its blending with atactic polypropylene were investigated.
The ratio of blending (in weight) was set at 100/0, 95/5, 90/10, 85/15, 80/20 and 75/25 respectively, while the method of roll blending was adopted.
On blended rubbers, the compatibility was examined by the phase separation in solution and phase contrast microscope, while on blended and conpounded rubbers and their vulcanizates such characteristic values as Mooney viscosity, mill shrinkage, extrudability, physical strength, swelling in toluene were measured. As a result, the following points were clarified.
As the blend ratio of atactic polypropylene increased in the unvulcanized state, Mooney viscosity dropped, while the mill shrinkage, sheet touch and extrusion properties were improved.
After being vulcanized, such physical characteristics as tensile strength, elongation and hardness were seen to suffer slight deterioration.
Also, in proportion to the blend ratio the various properties were seen to change more or less rectilinearly, while the observations with phase contrast microscope indicated that the blending was carried out micro-heterogeneously.

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