Crosslinking polymers with compounds containing xanthene groups
AssigneeE. I. Du Pont de Nemours and Company
InventorsEdward G. Brugel, Israel A. David, Frank P. Gay
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Abstract
This invention relates to a process for cross-linking polymers that are crosslinkable by free radicals and/or contain aromatic rings by heating these polymers with a compound containing xanthene groups. The crosslinked polymers have improved chemical resistance.
Claims25
A process for the crosslinking of polymers, comprising contacting a polymer that is free radially crosslinkable or contains aromatic rings or both, with oxygen, and with a xanthene compound having one or more xanthene groups, at a temperature of about 200.degree. C. to about 400.degree. C. for a period of time sufficient to effect crosslinking, provided that said xanthene compound has at least one hydrogen atom in the 9 position of one or more of the xanthene groups.
A composition, comprising, a polymer that is free radically crosslinkable and/or contains an aromatic ring, and about 1 mole percent to about 20 mole percent based on the number of monomer units in said polymer, of a xanthene compound having one or more xanthene groups, provided that said xanthene compound contains at least one hydrogen atom in the 9 position of one or more of the xanthene groups.
Dependencies are inferred from the claim text.