Would you want the following in your water? Then why bottle?
natural gas. The process begins by refining of crude oil or
natural gas and then “cracking” it using high temperature
furnaces. Ethylene and propylene can then be separated from
the gas phase, after which they may be used as monomers
or go through a subsequent chemical reaction to produce
other kinds of monomers. Monomers are joined together in
a chemical reaction to form long chains of repeating monomers
called polymers. Properties of the polymer depend on
the combinations of monomers used [3,4].
Answer:
For convenience.
So what, exactly, is your point?
In the case of ethylene and propylene, the base monomers are gases - conversion to polyethylene (PE) and polypropylene (PP) produce non-reactive polymers with little or no residual monomer. Typically the polymers are reworked into "articles of commerce" (bottles, etc) at elevated temperatures, so if there WAS any gaseous monomer this would be another opportunity for its release from the matrix.
There is no evidence of PE or PP plastics causing contamination problems in processed products - so it is very unlikely to appear in your water.
I think people are just stupid for spending a buck a pint for water. You can buy diet soda for $1 per gallon, and use the bottle to fill with tap water for free after that. You can always tell the idiots by seeing those trying too hard to be cool.
Ron.
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