Plastic and nonmetallic article shaping or treating: processes – Reactive gas or vapor treatment of work – Work is organic material
Patent
1989-07-12
1991-07-09
Tentoni, Leo B.
Plastic and nonmetallic article shaping or treating: processes
Reactive gas or vapor treatment of work
Work is organic material
264523, 264526, 427237, 4272481, 4272554, 427322, 427400, 525344, B05D 702, B29C 4900, B29C 7100, C08F 836
Patent
active
050303996
ABSTRACT:
An in-mold sulfonation system for sulfonating the surface of plastic articles such as plastic containers during molding. Sulfur trioxide is introduced into a pre-mold chamber, converted to a relatively high pressure gaseous sulfur trioxide, and then injected into a mold such as a blow mold immediately before or immediately following full expansion of the formed plastic article in the mold cavity. Neutralization with a gaseous neutralizing agent follows. By controlling the timing and temperature of the in-mold sulfonation step it is possible to produce a plastic article having an effective barrier layer but containing a minimum of undesirable rinseable salts.
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Tomkinson Donald L.
Walles Wilhelm E.
Kanuch Bruce M.
Tentoni Leo B.
The Dow Chemical Company
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