Benzoxazines and compositions containing the same

Patent metadata

Field	Value
Publication number	US-2016185908-A1
Application number	US-201514982057-A
Country	US
Kind code	A1
Filing date	Dec 29, 2015
Priority date	Dec 29, 2014
Publication date	Jun 30, 2016
Grant date	—

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.

First claim

What is claimed is:

1 . A curable composition comprising more than 80% by mass of a benzoxazine blend, said benzoxazine blend comprising:
(A) a non-halogenated, benzoxazine compound in liquid form at temperature range of 20° C.-30° C. and selected from the following Structure 1

and
(B) a multifunctional benzoxazine component comprising one or more benzoxazine compounds with functionality of 2 or greater.

2 . The curable composition of claim 1 , wherein the mass ratio of (A) to (B) is from about 50:50 to about 10:90.

3 . The curable composition of claim 1 , wherein the composition exhibits an uncured T g of room temperature (20° C.-30° C.) or lower as measured by Differential Scanning calorimetry (DSC).

4 . The curable composition of claim 1 , wherein the composition has viscosity of 5 Pa·s or less, preferably 1 Pa·s or less, at processing temperature in the range of 100° C.-150° C.

5 . The curable composition of claim 1 , wherein the multifunctional benzoxazine component (B) is a di-functional benzoxazine, and the weight ratio of monofunctional benzoxazine to difunctional benzoxazine is about 30:70.

6 . The curable composition of claim 1 , wherein the benzoxazine blend comprises the liquid benzoxazine compound of Structure 1 and a trifunctional benzoxazine compound, and the mass ratio of liquid benzoxazine to trifunctional benzoxazine is from about 50:50 to about 10:90.

7 . The curable composition of claim 1 , wherein the multifunctional benzoxazine component (B) comprises a combination of a difunctional benzoxazine compound and a trifunctional benzoxazine compound, and the tri-functional benzoxazine compound is present in an amount of no more than 25% by weight based on the total weight of the benzoxazine blend.

8 . The curable composition of claim 5 , wherein the difunctional benzoxazine compound is selected from:

9 . The curable composition of claim 6 , wherein the trifunctional benzoxazine compound is selected from:

10 . The curable composition of claim 1 , wherein the multifunctional benzoxazine component (B) comprises a combination of m-substituted difunctional benzoxazine compound and m-substituted trifunctional benzoxazine trifunctional benzoxazine compound, and the trifunctional benzoxazine is at maximum 15% by weight based on the total weight of the benzoxazine blend.

11 . The curable composition of claim 1 , wherein the curable composition is void of or contains less than 5% by weight, based on the total weight of the composition, of any thermosettable resin selected from epoxy, cyanate ester, bismaleimide, and phenol-formaldehyde.

12 . The curable composition of claim 1 , wherein the curable composition is void of any organic solvent.

13 . The curable composition of claim 1 , wherein the curable composition is thermally stable a temperature in the range of about 180° C. to about 250° C.

14 . A continuous resin film formed from the curable composition of claim 1 .

15 . A composite material comprising reinforcement fibers impregnated or infused with the curable composition of claim 1 .

16 . The composite material of claim 15 , wherein the reinforcement fibers are selected from carbon fibers, glass fibers, and aramid fibers.

17 . The composite material of claim 1 , wherein the reinforcement fibers are in the form of unidirectional fibers, a fabric, or a preform comprised of an assembly of fibers or fabric plies.

18 . A method for forming a prepreg comprising:
(i) forming at least one continuous resin film from the curable composition of claim 1 ; 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.

19 . The method of claim 18 , wherein the layer of reinforcement fibers is in the form of unidirectional fibers.

20 . A prepreg produced by the method of claim 18 .

21 . A method for fabricating a composite part comprising:
(i) providing a preform comprising an assembly of fibers or fabric plies on a mold surface; (ii) infusing the preform with the curable composition of claim 4 ; and (iii) curing the infused preform.

22 . A curable composite part produced by infusing a fibrous preform with the curable composition of claim 4 .

Assignees

• Cytec Ind Inc

Inventors

• Harriman Mark Edward
• Cross Paul Mark
• Gupta Ram B

Classifications

• C08L61/34

  Condensation polymers of aldehydes or ketones with monomers covered by at least two of the groups C08L61/04, C08L61/18 and C08L61/20 · CPC title

• C07D265/14

  condensed with one six-membered ring · CPC title

• C08K5/357

  Six-membered rings · CPC title

• B32B27/04

  as impregnant, bonding, or embedding substance {(not used)} · CPC title

• C08G73/02

  Polyamines · CPC title