Compatibilized blends of an isoolefin polymer and an unsaturated diene polymer are prepared by utilizing a compatibilizing agent comprising a block/graft copolymer containing poly- or copoly-isoolefin segments and C.sub.4 to C.sub.6 alkyl-substituted styrene polymer segments, such as poly(t-butylstyrene) segments.

 
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> Composition for forming porous film, porous film and method for forming the same, interlevel insulator film

> Method and apparatus for determining figure

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