Patent ID: 7119146

Claim:
A compatibilized polymer blend comprising: (a) an isoolefin polymer component selected from: (i) homopolymers of C 4 –C 8 isoolefins; (ii) random copolymers comprising C 4 –C 8 isoolefins with 0–10 wt % conjugated diene; (iii) halogenated random copolymers comprising C 4 –C 8 isoolefins with 0–10 wt % conjugated diene; (iv) random copolymers comprising C 4 –C 8 isoolefins with 0–20 wt % of a para-alkylstyrene; (v) halogenated random copolymers comprising C 4 –C 8 isoolefins with 0–20 wt % of a para-alkylstyrene; (vi) random compolymers comprising 70–99.8 wt % isoolefin, 0.1 to 10 wt % conjugated diene, and 0.1–20 wt % para-alkylstyrene; (vii) halogenated random compolymers comprising 70–99.8 wt % isoolefin, 0.1 to 10 wt % conjugated diene, and 0.1–20 wt % para-alkylstyrene; (viii) random compolymers comprising 80–99 wt % isoolefin, 0.5–5 wt % conjugated diene, and 0.5–15 wt % para-alkylstyrene; (ix) halogenated random compolymers comprising 80–99 wt % isoolefin, 0.5–5 wt % conjugated diene, and 0.5–15 wt % para-alkylstyrene; and (x) their mixtures; (b) at least one olefinically unsaturated diene polymer; and (c) a compatibilizer for components (a) and (b) that is a block or graft copolymer comprising: (i) a recurring isoolefin-type moiety (iB) wherein the isoolefin-type moiety is selected from: I homopolymers of C 4 –C 8 isoolefins; II random copolymers comprising C 4 –C 8 isoolefins with 0–10 wt % conjugated diene; III random copolymers comprising C 4 –C 8 isoolefins with 0–20 wt % of a para-alkylstyrene; IV random compolymers comprising 70–99.8 wt % isoolefin, 0.1 to 10 wt % conjugated diene, and 0.1–20 wt % para-alkylstyrene; and V random compolymers comprising 80–99 wt % isoolefin, 0.5–5 wt % conjugated diene, and 0.5–15 wt % para-alkylstyrene; and (ii) a recurring styrene-type moiety (S) wherein S is a para-t-butylstyrene segment (tbS).