Isobutylene-based elastomer blends
AssigneeExxonMobil Chemical Patents Inc.
InventorsAndy H Tsou, Ilan Duvdevani, Hsien-Chang Wang
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Abstract
The improved green strength, green elongation, and green relaxation properties of isobutylene-based elastomers at elevated temperatures along with improved aging and barrier properties are achieved by blending semi-compatible, semi-crystalline copolymers with the isobutylene elastomers. The semi-crystalline copolymers are typically copolymers of ethylene and an alpha-olefin having from 4 to 16 carbon atoms. The improved properties are maintained in subsequent rubber compounds containing said blends and are particularly useful in tire and pharmaceutical container applications.
Claims23
A blend comprising an isobutylene-based polymer and a semi-crystalline ethylene copolymer, the semi-crystalline ethylene copolymer having an ethylene derived content of at least 45 wt % based on the total weight of the semi-crystalline copolymer;
- wherein the cured blend possesses an air permeability from less than 8×10−8 [cm3-cm/cm2-sec-atm] at 65° C.
A method for producing a polymer blend comprising mixing an isobutylene-based polymer with a semi-crystalline copolymer, the semi-crystalline polymer having an ethylene content of at least 45 wt % by weight of the semi-crystalline copolymer;
- wherein the cured blend possesses an air permeability from less than 8×10−8 [cm3-cm/cm2-sec-atm] at 65° C.
Dependencies are inferred from the claim text.