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Durable hydrophilic polymer coatings
| Details |
Inventors: Palmer, Jr., Charles Francis;
Assignee: Stepan Company (Northfield, IL)
Primary Examiner: Bell; James J.
Assistant Examiner:
Attorney, Agent or Firm: McDonnell, Boehnen Hulbert & Berghoff
Compositions useful for imparting durable hydrophilic polymer coatings to polyester, polypropylene or polyethylene fibers or fabrics comprising A) an aqueous dispersion of 1) a hydrophilic copolyester having repeating segments of a polyoxyethylene diester and a polyalkylene diester, and 2) a polypropylene oxide polymer capped on one or both ends with an alkyl or ester group, said polymer having more than 4 propylene oxide units and an average molecular weight of at least about 300; B) a mixture of 1) an organic solvent, 2) a hydrophilic copolyester having repeating segments of a polyoxyethylene diester and a polyalkylene diester, and 3) a polypropylene oxide polymer capped on one or both ends with an alkyl or monoester group, said polymer having more than 4 propylene oxide units and an average molecular weight of at least about 300; C) an aqueous dispersion of 1) a hydrophilic copolyester having repeating segments of a polyoxyethylene diester and a polyalkylene diester, and 2) a polypropylene glycol having an average molecular weight greater than 1100; or D) a mixture of 1) an organic solvent, 2) a hydrophilic copolyester having repeating segments of a polyoxyethylene diester and a polyalkylene diester, and 3) a polypropylene glycol having an average molecular weight greater than 1100 are disclosed. |
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DETAILED DESCRIPTION OF THE INVENTION The present invention comprises compositions that when applied to polyester, polypropylene or polyethylene fabric or fiber impart a durable hydrophilic coating.
The present invention further comprises methods for imparting a durable hydrophilic coating to polyester, polypropylene and polyethylene fabric or fiber comprising application of the compositions as described above.
The present invention further comprises, in woven or nonwoven form, polyester, polypropylene, or polyethylene fabric or fiber having such a coating applied to its surface.
By the term "organic solvent" is meant those organic solvents incapable of forming three dimensional networks of strong hydrogen bonds.
Examples of suitable solvents include dibasic esters, esters (for example ethyl acetate), ketones (for example acetone), ethers (for example tetrahydrofuran) and tertiary amides (for example dimethylformamide or dimethylacetamide).
The term "hydrophilic copolyester" is used to mean a copolyester containing both polyoxyethylene diester and alkylene diester segments.
They may be simple copolyesters, i.
e.
, they may contain only polyoxyethylene diester and polyalkylene diester segments, the copolyester being derived from a single polyethylene oxide, diester and glycol.
Polyethylene oxides of various molecular weights, dimethyl terephthalate and ethylene glycol are the most common raw materials for these copolymers, mainly because of cost and availability.
Numerous variations on the comonomers used to prepare these simple hydrophilic copolyesters are possible.
Other alkylene glycols such as propylene and butylene glycols are suitable for the replacement of all or part of the ethylene glycol, or they may be incorporated in minor amounts into the polyethylene oxide employed.
Simple ether glycols such as diethylene glycol, and cycloaliphatic diols such as 1,4-cyclohexane dimethanol, are also appropriate as comonomers for the base copolyesters.
Among other diesters that may be used to replace all or part of the dimethyl terephthalate are diesters of aliphatic diacids such as adipic and sebacic acids, and diesters of aromatic diacids such as isophthalic and sulfonated isophthalic acids
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Manufacturing Materials 
