Polyurethane diacrylate compositions
AssigneeTyndale Plains-Hunter, Ltd.
InventorsFrancis E. Gould, Christian W. Johnston
Life of this patent
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Abstract
Polyurethane diacrylate compositions are obtained by reacting a diacrylate in the presence of from about 30 to about 95 weight percent of a hydrophilic polyurethane resin. The resulting products will form a hydrogel upon immersion in water and are permeable to gases, ions and other low molecular weight species. The hydrophilic polyurethane diacrylate compositions may be molded to form shaped products that are dimensionally stable after repeated exposure to boiling water and exhibit memory.
Claims15
A hydrophilic polyurethane diacrylate composition which will form a hydrogel upon immersion in water;
- is permeable to gases, ions and other low molecular weight species;
- is dimensionally stable and exhibits memory;
- obtained by the reaction of from about 5 to about 70 weight percent of a diacrylate having the formula:
- ##STR3## wherein R is selected from the group consisting of hydrogen and the methyl radical and n is a whole number, such that the average molecular weight of said diacrylate is no greater than 1588;
- in the presence of from about 95 to about 30 weight percent of a hydrophilic polyurethane resin.
A method of preparing a hydrophilic polyurethane diacrylate composition which comprises reacting a diacrylate in the presence of from about 30 to about 95 weight percent of a hydrophilic polyurethane resin.
Dependencies are inferred from the claim text.