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US 4,233,432 AGranted
Dicyclopentadiene polyester resins
AssigneeUnited States Steel Corporation
InventorOmer E. Curtis, Jr.
Life of this patent
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Abstract
The invention disclosed is for a method of preparing unsaturated polyester resins containing high amounts of dicyclopentadiene. These polyester resins are useful in curable liquid compositions containing them together with a monomeric copolymerizable component. Such compositions may be used at ambient or elevated temperature, in casting, laminating or molding techniques known to the polyester resin art.
Claims9
Method for preparing an unsaturated polyester comprising the steps of:
- (a) reacting about 100 moles of a polycarboxylic acid component containing at least about 25 moles maleic acid with about 50 to about 200 moles of dicyclopentadiene at a temperature of about 90.degree. C. to about 150.degree. C. for a sufficient period of time to provide a reaction product comprising at least 25 mole % half maleic ester of dicyclopentyl alcohol;
- (b) further reacting the reaction product of step (a) with about 25 to about 100 moles of a polyol or mixture of polyols per 100 moles of polycarboxylic acid in step (a), at a temperature of at least about 180.degree. C. until the acid number of the resultant unsaturated polyester is less than about 55.
Dependencies are inferred from the claim text.