Polyurethane polyene compositions
AssigneeTyndale Plains-Hunter, Ltd.
InventorsFrancis E. Gould, Christian W. Johnston
Life of this patent
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Abstract
Polyurethane polyene compositions are obtained by reacting from about 10 to about 50 parts by weight of a polyene in the presence of about 100 parts by weight of a hydrophilic polyurethane resin. The resulting products will swell and increase in weight upon immersion in water and are permeable to gases, moisture vapor 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.
Claims13
A hydrophilic polyurethane polyene composition comprising from about 10 to about 50 parts by weight of a polyene selected from the group consisting of polyallyl esters having the formula:
- ##STR7## wherein n is a whole number larger than 1 and smaller than 4, and R is the residue of a polybasic acid;
- and polyacrylic esters having the formula:
- ##STR8## wherein n is a whole number larger than 2 and smaller than 7, R is hydrogen or a methyl radical and A is the residue of a polyhydric alcohol;
- and about 100 parts by weight of a hydrophilic polyurethane resin.
A method of preparing a hydrophilic polyurethane polyene composition which comprises reacting from about 10 to about 50 parts by weight of a polyene in the presence of about 100 parts by weight of a hydrophilic polyurethane.
Dependencies are inferred from the claim text.