Thermoplastic urethane elastomeric alloys
AssigneeREFAC International, Ltd.
InventorWilliam H. Mann
Life of this patent
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Abstract
Thermoplastic urethane elastomeric alloys are obtained by melt compounding at least one first component that is a polyurethane elastomer having at least one plasticizer reacted therein, this first component being formed by heating a reaction mixture comprising at least one isocyanate having a functionality of less than about 2.2, at least one long chain polyol, at least one chain extender and at least one plasticizer in specified amounts at a temperature of at least about 330.degree. F. (165.6.degree. C.), with at least one second component that is another thermoplastic elastomer not within the definition of the first component.
Claims12
A composition containing:
- (a) from 5-95 wt. % of a first component of at least one first thermoplastic hot melt composition formed by heating to a temperature of at least about 330.degree. F. (165.6.degree. C.) a reaction mixture comprising at least one isocyanate having a functionality less than about 2.2, at least one chain polyol, at least one chain extender and at least one plasticizer, the NCO/QH ratio in the reaction system being about 0.95 to about 1.05, wherein said ingredients are present in amounts sufficient to meet the following formula:
- ##EQU2## wherein A represents the equivalent weight of the long chain polyol x the moles thereof used;
- B represents the equivalent weight of the chain extender x the moles thereof used;
- C represents the equivalent weight of the isocyanate used;
- and D represents the grams of plasticizer, and
- (b) from 95-5 wt. % of a second component of a polyurethane not within the definition of the first component.
Dependencies are inferred from the claim text.