Bulk polyurethane ionomers
AssigneeThe Dow Chemical Company
InventorsSven H. Ruetman, Joginder N. Anand
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Abstract
The invention relates to bulk polyurethane ionomers prepared by the reaction (A) an isocyanate terminated ionic prepolymer with (B) a hydrocarbon polyol chain extender, said prepolymer having been prepared from (i) an excess of diisocyanate, (ii) a mixture comprising a diol and an organic polyol having three or more reactive hydroxyl moieties each having a molecular weight of from about 250 to about 6,000 and (iii) a difunctional isocyanate-reactive component containing an ionic group or potential ionic group.
Claims17
A bulk polyurethane ionomer prepared by the reaction of (A) an isocyanate terminated ionic prepolymer with (B) a hydrocarbon polyol chain extender said prepolymer having been prepared from (i) an excess of a diisocyanate, (ii) a mixture comprising a diol and an organic polyol having three or more reactive hydroxyl groups each having a molecular weight of from about 250 to about 6,000 and (iii) a difunctional isocyanate-reactive component containing an ionic group or potential ionic group.
A bulk polyurethane ionomer prepared by the reaction of
- A. an isocyanate terminated ionic prepolymer prepared from
- (i) a cycloaliphatic diisocyanate;
- (ii) a polyol mixture comprising:
- (a) a polyalkyleneoxy diol having a molecular weight of from about 500 to about 6,000:
- and
- (b) a polyalkyleneoxy triol having a molecular weight of from about 500 to about 3,000 and wherein said triol can be present in up to about 50 hydroxyl equivalent percent of said mixture;
- and
- (iii) a carboxylic acid containing diol wherein said acid is neutralized with a tertiary amine after said prepolymer formation to form said ionic function,
- wherein said (iii) is present in sufficient proportions to provide about 10 to about 150 milliequivalents of said ionic groups per 100 grams of said prepolymer and further, wherein the proportions of said (i), (ii), and (iii) are such that the ratio of isocyanate equivalents to the total isocyanate-reactive equivalents falls in a range of from about 1.1 to about 3;
- and
- B. a hydrocarbon diol wherein the proportions of said (A) and (B) are such that the ratio of equivalents of isocyanate in (A) to hydroxy equivalents in (B) falls in a range of from about 1.25 to about 0.90.
Dependencies are inferred from the claim text.