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US 11,566,106 B2Granted
Composite materials containing benzoxazines and method for making the same
AssigneeCytec Industries Inc.
InventorsMark Edward Harriman, Paul Mark Cross, Ram B. Gupta
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Abstract
A curable composition containing more than 80% by weight of a blend of benzoxazines, wherein the blend includes (A) one or more multifunctional benzoxazines and (B) a liquid, non-halogenated monofunctional benzoxazine. This composition has been found to be stable at high temperatures, e.g. 180° C.-250° C., and suitable for making composite materials using conventional techniques such as prepregging and liquid resin infusion.
Claims6
A method for forming a prepreg comprising:
- (i) forming a continuous resin film from a curable composition comprising more than 80% by mass of a benzoxazine blend;
- and
- (ii) pressing the continuous resin film onto a layer of reinforcement fibers with application of heat so as to impregnate the layer of reinforcement fibers,
- wherein said benzoxazine blend consists of:
- (A) a non-halogenated, monofunctional benzoxazine compound that is in liquid form at a temperature in the range of 20° C.-30° C. and has the following structure:
- and
- (B) a multifunctional benzoxazine component comprising at least one trifunctional benzoxazine compound selected from the group consisting of following compounds:
- wherein the mass ratio of (A) to (B) is from 50:50 to 10:90, and
- wherein the curable composition exhibits an uncured Tg of 30° C. or lower as measured by Differential Scanning calorimetry (DSC).
6 more elements
Dependencies are inferred from the claim text.