High flexural modulus reaction injection molded urethanes
AssigneeOlin Corporation
InventorsRobert L. Visger, Mark A. Plano
Life of this patent
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Abstract
A two-part liquid composition capable of being mixed with a foaming agent and placed in a reaction injection molding apparatus to form a microcellular composition, which when cured yields a urethane product having improved flexural modulus properties. The composition is comprised of a part "A" which is comprised of an organic isocyanate, and a part "B" which is comprised of a base polyol, a catalyst, and a chain extending agent mixture comprised of a glycol and at least one high functionality supplemental polyol.
Claims18
A foamable liquid composition capable of yielding when cured a microcellular urethane product with improved flexural modulus properties, said composition comprising:
- (A) an organic isocyanate;
- and
- (B) a mixture which comprises
- (i) a base polyol having
- (a) an equivalent weight in the range from about 1,800 to about 7,000, and
- (b) an average functionality in the range from about 2 to about 4,
- (ii) a chain extending agent comprising
- (a) a glycol, and
- (b) at least one high functionality supplemental polyol having an average molecular weight in the range from about 300 to about 1,550 and an average functionality of at least about 3,
- (iii) a catalyst and
- (iv) a foaming agent;
- and
- wherein the stoichiometric equivalent weight of said organic isocyanate to said base polyol is in the range from about 95 to about 125, the amount of said chain extending agent employed is in the range from about 12 to about 40 parts per 100 parts of said mixture, and the amount of said high functionality supplemental polyol employed in said chain extending agent is at least about 2 parts per 100 parts of said mixture.
A foamable liquid composition capable of yielding when cured a microcellular urethane product with improved flexural modulus properties, said composition comprising:
- (A) an organic isocyanate;
- and
- (B) a mixture which comprises
- (i) a base polyol having
- (a) an equivalent weight in the range from about 1,800 to about 7,000, and
- (b) an average functionality in the range from about 2 to about 4,
- (ii) a chain extending agent comprising
- (a) a glycol, and
- (b) a high functionality supplemental polyol having an average molecular weight in the range from about 250 to about 1,600 and an average functionality of at least about 3, wherein said high functionality supplemental polyol is a sucrose amine polyol,
- (iii) a catalyst and
- (iv) a foaming agent;
- and
- wherein the stoichiometric equivalent weight of said organic isocyanate to said base polyol is in the range from about 95 to about 125, the amount of said chain extending agent employed is in the range from about 12 to about 40 parts per 100 parts of said mixture, and the amount of said high functionality supplemental polyol employed in said chain extending agent is at least about 2 parts per 100 parts of said mixture.
Dependencies are inferred from the claim text.