Coating processes – With pretreatment of the base – Organic base
Patent
1975-03-24
1976-10-19
Husack, Ralph
Coating processes
With pretreatment of the base
Organic base
427400, 427407E, 427407C, 428 35, B05D 310, B32B 2732
Patent
active
039872203
ABSTRACT:
This invention relates to a process for improving the vapor barrier properties of a shaped article having relatively poor vapor barrier characteristics, said article shaped from a polymer having a plurality of carboxylic acid salt groups formed by the reaction of pendant carboxylic acid groups and a cation which compises:
Displacing at least a portion of the cations in said polymer by contacting the surface of said shaped article with an effective proportion of an acid having a sufficient degree of ionization and for a time to displace said cation, thereby generating pendant carboxylic acid groups;
Coating the contacted surface of said shaped article with an organic polyisocyanate;
Bonding said organic polyisocyanate to said shaped article by reacting the isocyanate groups with said pendant carboxylic acid groups; and
Applying a coating having vapor barrier characteristics to said shaped article.
REFERENCES:
patent: 2801447 (1957-08-01), Wolinski
patent: 3267083 (1966-08-01), Imhof
patent: 3338739 (1967-08-01), Rees
Dittmann William A.
Husack Ralph
Kerwin Joseph E.
Shapiro Paul
Tee-Pak Inc.
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