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US 4,089,645 AGranted
Process for dyeing polymer substrates
AssigneeHooker Chemicals & Plastics Corporation
InventorsVernon P. Simpson, Alma L. Coats
Life of this patent
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Abstract
Polymer substrates particularly molded resins and polymers are dyed by pretreatment of the substrate with a phosphorus sulfide, particularly phosphorus sesquisulfide, followed by contacting the treated substrate with an aqueous dyestuff composition.
Claims22
The process of dyeing polymer substrates which comprises the steps of
- (a) treating a polymer substrate with a low oxidation state phosphorus sulfide from the group consisting of phosphorus resquisulfide, tetraphosphorus pentasulfide and tetraphosphorus hept a sulfide to deposit at the surface of said substrate a coating of said low oxidation state phosphorus sulfide, and
- (b) dyeing the thus treated polymer substrate by contacting it with an aqueous liquor comprising a basic organic dyestuff.
The process which comprises the steps of
- (1 ) Solvent washing a molded polyester article comprising a mixture of an ethylenically unsaturated polyester which has been cross limked with styrene and a saturated polymer containing terminal carboxyl groups,
- (2 ) pretreating said article with a perchloroethylene solution of phosphorus sesquisulfide, and
- (3) dyeing said pretreated article in an aqueous dyebath containing a water soluble basic organic dyestuff.
Dependencies are inferred from the claim text.