| http://www.w3.org/ns/prov#value | - More specifically, the preferred polymer for the preparation of the blocking layer of the present invention is represented by polymer (III) ##STR14## wherein R1, R2, and R3 are hydrogen atoms or aliphatic groups, such as alkyl groups with for example, from about 1 to about 12, and preferably about 5 carbon atoms; R' and R are substituents selected, for example, from the group consisting of hydrog
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