Benzoxazine based polyurethane resin composition

1. A composition comprising:

(a) a polyfunctional isocyanate;

(b) an isocyanate reactive composition comprising:

(b1) a polyfunctional polyol and a catalyst composition; and/or

(b2) a polyfunctional amine; and

(c) a benzoxazine component, wherein the benzoxazine component is dissolved in at least one of components (a) and (b),

wherein the molecular weight of the polyfunctional polyol is in an amount ranging from about 100 to about 800 Daltons and the portion of benzoxazine component (c) by weight percentage of the amount of component (b) and (c) is in the range from about 25 to about 60.

2. The composition of claim 1 , wherein the composition has an NCO index in the range from about 0.7 to about 5.

3. The composition of claim 1 , wherein the polyfunctional isocyanate is a polymeric MDI or an MDI isomer mixture or a mixture thereof.

4. The composition of claim 1 , wherein the benzoxazine component is bisphenol-A type benzoxazine.

5. The composition of claim 1 , wherein the polyfunctional polyol and the catalyst composition (b1) are present in the isocyanate reactive composition (b), and wherein the catalyst composition comprises an amine catalyst and/or a trimerization catalyst.

6. The composition of claim 1 , wherein the polyfunctional amine (b2) is present in the isocyanate reactive composition (b), and wherein the polyfunctional amine (b2) is polyetheramine.

7. The composition of claim 1 , wherein the composition further comprises at least one solvent.

8. The composition of claim 1 , wherein the composition further comprises at least one surfactant.

9. A composition comprising:

(a) a polyfunctional isocyanate, wherein the polyfunctional isocyanate is a polymeric MDI or an MDI isomer mixture or a mixture thereof;

(b) an isocyanate reactive composition comprising:

(b1) a polyfunctional polyol having a molecular weight in an amount ranging from about 100 to about 800 Daltons and a catalyst composition; and/or

(b2) a polyfunctional amine;

(c) a benzoxazine component dissolved in in at least one of components (a) and (b) in an amount from about 25 to about 60 weight percent based on a total weight of (b) and (c), wherein the benzoxazine component is a bis(dihydrobenzoxazine) based on a bisphenol.

10. The composition of claim 9 , wherein the bisphenol is selected from the group consisting of: 4,4′-dihydroxybiphenyl, (4-hydroxyphenyl) 2 C(O) (DHBP), bi(4-hydroxyphenyl)ether, bi(4-hydroxyphenyl)thioether, bisphenol A, bisphenol AP, bisphenol E, bisphenol H, bisphenol F, bisphenol S, bisphenol Z, phenolphthalein, and bi(4-hydroxyphenyl)tricyclo-[2,1,0]-decan.

11. The composition of claim 9 , wherein the benzoxazine component is a monomer.

12. The composition of claim 9 , wherein the benzoxazine component is an oligomer.

13. The composition of claim 9 , wherein the isocyanate reactive composition is a polyfunctional amine, and the benzoxazine component is a polymer.