Abstract Surface-modified polyester articles are provided having soilrelease properties and improved dispersed dyeability comprising a copolyester comprising at least 85 percent by weight of ethylene terephthalate units and about one to 15 percent by weight of ethylene dimerate units, and having cocrystallized on the surface thereof a copolymer comprising at least 40 percent by weight of polyoxyalkylene groups, at least 9.5 percent by weight of ethylene terephthalate units and at least 0.5 percent by weight of ethylene dimerate units. The surface-modified polyester articles are prepared by applying a copolymer comprising polyoxyalkylene groups, ethylene terephthalate units, and ethylene dimerate units to the copolyester comprising ethylene terephthalate units and ethylene dimerate units and subjecting the surface treated copolyester article to a temperature of at least 80* C. for a time sufficient to cause cocrystallization to take place on the surface of the treated copolyester.
A surface-modified polyester article as defined in claim 1 wherein the copolyester has cocrystallized on the surface thereof a copolymer comprising about 40 to 90 percent by weight of polyoxyalkylene groups having an average molecular weight of about 300 to 6,000, about 9.5 to 50 percent by weight of ethylene terephthalate units and about 0.5 to 10 percent by weight of ethylene dimerate units.
Claim 2
Dependent Claim
90 words
A surface-modified polyester article as defined in claim 1 wherein the copolyester comprises from about 87.2 to 98.6 percent by weight of ethylene terephthalate units and about 1.4 to 12.8 percent by weight of ethylene dimerate units and has cocrystallized on the surface thereof a copolymer comprising about 75 to 85 percent by weight of polyoxyethylene groups having an average molecular weight of about 4,000 to 6,000, about 13 to 18 percent by weight of ethylene terephthalate units and about 2 to 7 percent by weight of ethylene dimerate units.
Claim 3
Dependent Claim
17 words
A surface-modified polyester article as defined in claim 1 in the form of a fiber or filament.