| http://www.w3.org/ns/prov#value | - The usual method may, for example, be a method which comprises incorporating a radical polymerization initiator which is commonly used for polymerization, to the polymerizable components and then gradually heating the mixture within a temperature range of from room temperature to about 130??? C., or a method which comprises irradiating electromagnetic waves such as microwaves, ultraviolet rays or
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