초록 ▼

Elastomeric polyurethane-polyurea polymers are disclosed that are derived from the reaction of organic polyisocyanates with A. primary hydroxyl polyols having a functionality of 2 to 4 and a molecular weight from 1500 to 12000, and B. extender mixtures comprised of 1. an aromatic diamine wherein at

Elastomeric polyurethane-polyurea polymers are disclosed that are derived from the reaction of organic polyisocyanates with A. primary hydroxyl polyols having a functionality of 2 to 4 and a molecular weight from 1500 to 12000, and B. extender mixtures comprised of 1. an aromatic diamine wherein at least one of the positions ortho to each amine group is substituted by a lower alkyl group, and 2. a lower molecular weight diol, provided that the aromatic diamine comprises from 5 to 45 percent by weight of the extender mixture and the balance comprises the diol. The polymers find particular utility in the preparation of reaction injection molded parts, particularly, automotive parts because of their excellent flexural modulus, tensile, and tear properties.

대표청구항 ▼

In an elastomeric polyurethane-polyurea polymer prepared by the catalyzed reaction of an organic polyisocyanate, a polyol and an extender mixture comprising an aromatic polyamine and a low molecular weight diol the improvement which comprises employing in said reaction, with said organic polyisocyan

In an elastomeric polyurethane-polyurea polymer prepared by the catalyzed reaction of an organic polyisocyanate, a polyol and an extender mixture comprising an aromatic polyamine and a low molecular weight diol the improvement which comprises employing in said reaction, with said organic polyisocyanate A. a polyol having a primary hydroxyl functionality of from about 2 to about 4 and a molecular weight of from about 1500 to about 12,000, and B. an extender mixture comprising, (i) an aromatic diamine wherein at least one of the positions ortho to each amine group of said diamine is substituted by a lower alkyl group, and (ii) a low molecular weight diol provided that said aromatic diamine comprises from about 5 to about 45 percent by weight of said extender mixture with the balance of from about 55 to about 95 percent by weight comprising the diol extender, and wherein the equivalent proportions of said polyol (A) to said extender mixture (B) is within the range of about 1:4 to about 1:50, and the ratio of isocyanate equivalents to the total active hydrogen equivalents of said polyol, said aromatic diamine, and said diol is from about 0.85 to about 1.35.