LINEAR AND BRANCHED POLYIMIDE COMPOSITION

• US 20190315963A1
• Filed: 12/29/2017
• Published: 10/17/2019
• Est. Priority Date: 12/31/2016
• Status: Active Grant

• Current Assignee: SHPP Global Technologies BV (Government of Saudi Arabia)
• Original Assignee: SABIC Global Technologies BV (Government of Saudi Arabia)
• Inventors: ODLE, Roy Ray, JOHNSON, Peter, CHELLAMUTHU, Manojkumar, KONG, Hee Won, LONG, Timothy Edward
• Granted Patent: US 11,377,521 B2
• Time in Patent Office: Days
• CPC Class Codes: C08G 73/1007 from tetracarboxylic acids or derivatives and diamines
• CPC Class Codes: C08G 73/101 containing chain terminating or branching agents
• CPC Class Codes: C08G 73/1046 Polyimides containing oxygen in the form of ether bonds in the main chain
• CPC Class Codes: C08G 73/1071 Wholly aromatic polyimides containing oxygen in the form of ether bonds in the main chain
• CPC Class Codes: C08G 73/122 containing chain terminating or branching agents
• CPC Class Codes: C08L 2203/12 used for fibers
• CPC Class Codes: C08L 2203/14 used for foams
• CPC Class Codes: C08L 2205/025 containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
• CPC Class Codes: C08L 2205/03 containing three or more polymers in a blend
• CPC Class Codes: C08L 79/08 Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors

Abstract

A polyimide composition includes 1 to 99 weight percent, preferably 70 to 99 weight percent, more preferably 75 to 95 weight percent of a first polyimide; and 1 to 99 weight percent, preferably 1 to 30 weight percent, more preferably 2 to 25 weight percent of a second polyimide, wherein the first polyimide and the second polyimide are different, and wherein the polyimide composition has a melt flow rate that is greater than a melt flow rate of the first polyimide and less than a melt flow rate of the second polyimide; an apparent viscosity that is less than an apparent viscosity of the first polyimide and less than an apparent viscosity of the second polyimide; and a notched Izod impact strength that is greater than a notched Izod impact strength of the first polyimide and greater than a notched Izod impact strength of the second polyimide.

Claims

1. A polyimide composition comprising:

70 to 99 weight percent of a first polyimide, wherein the first polyimide is a linear polyimide; and

1 to 30 weight percent of a second polyimide, wherein the second polyimide is a branched polyimide of the formula

2. The polyimide composition of claim 1, wherein

the melt flow rate is at least 20 grams per 10 minutes when measured at 337°

C. at a shear load of 6.7 kg, in accordance with ASTM 1238;

the apparent viscosity is less than 320 Pascal second when measured at 380°

C. at a shear rate of 640 inverse seconds, in accordance with ISO 11443;

the notched Izod impact strength of the composition is at least 31 Joules per meter at 23°

C. according to ASTM D256; and

the glass transition temperature is greater than 200°

C.

3. The polyimide composition of claim 1, wherein the composition has at least one of

a viscosity change of less than 60%, after 1,800 seconds at 400°

C. and a shear rate of 640 inverse seconds;

or

a tensile elongation at break of greater than 20%, at 23°

C. according to ASTM D638;

or

a notched Izod impact strength of at least 30 Joules per meter at 23°

C. according to ASTM D256;

or

an unnotched Izod impact strength of at least 1,100 Joules per meter at 23°

C. according to ASTM D256;

or

a reverse notched Izod impact strength of at least 850 Joules per meter at 23°

C. according to ASTM D256.

4. The polyimide composition of claim 1, wherein

the first polyimide has a weight average molecular weight of 28,000 to 60,000 grams per mole, as measured by gel permeation chromatography using a triple-point detector,

the second polyimide has a weight average molecular weight of 32,000 to 60,000 grams per mole, as measured by gel permeation chromatography using a triple-point detector, and

a polydispersity index of the first polyimide is less than a polydispersity index of the second polyimide, as measured by gel permeation chromatography using a triple-point detector.

5. The polyimide composition of claim 1, wherein in the second polyimide

G is present in an amount of 0.5 to 10 mol,

2 to 4, and

the total of all values of n is greater than 10.

6. The polyimide composition of claim 5, wherein G is —

O—

when m is 0, of G is a pentavalent P(O), a C_6-50 hydrocarbon having at least one aromatic group, a C_2-20 aliphatic group, a C_4-8 cycloaliphatic group, a C_3-12 heteroarylene, or a polymer moiety.

7. The polyimide composition of claim 5, wherein q is 1, Q is a C_6-20 arylene, m is 1, and M is —

O—

.

8. The polyimide composition of claim 5, wherein V is a group of the formula

9. The polyimide composition of claim 5, wherein the second polyimide is a branched polyetherimide of the formula

10. The polyimide composition of claim 9, wherein Z is a divalent group of the formula

11. The polyimide composition of claim 5, comprisingto 98 weight percent of the first polyimide;

and

2 to 20 weight percent of the second polyimide,

wherein G is present in an amount 0.1 to 5 mole percent.

12. A method for the manufacture of the polyimide composition of claim 1, the method comprising

reacting

a polyamine of the formula

13. The method for of claim 12, wherein the second polyimide is a polyetherimide, the method comprises:

reacting

the polyamine, having the formula

14. The method of claim 12, wherein the reaction is conducted in the further presence of an endcapping agent.

15. The method of claim 14, wherein the endcapping agent is phthalic anhydride, an aliphatic- or aryl-substituted phthalic anhydride, aniline, a C_1-18 linear, branched, or cyclic aliphatic monoamine, or a monofunctional aromatic amine.

16. The method of claim 12, wherein the blending comprises melt processing the first polyimide and the second polyimide.

17. A polymer composition comprising:

the polyimide composition of claim 1; and

an additional polymer different from the first polyimide and second polyimide.

18. The polymer composition of claim 17, wherein the additional polymer is a polyacetal, poly(C_1-6 alkyl)acrylate, polyacrylamide, polyacrylonitrile, polyamide, polyamideimide, polyanhydride, polyarylene ether, polyarylene ether ketone, polyarylene ketone, polyarylene sulfide, polyarylene sulfone, polybenzothiazole, polybenzoxazole, polybenzimidazole, polycarbonate, polyester, polyetherimide, polyimide, poly(C_1-6 alkyl)methacrylate, polymethacrylamide, cyclic olefin polymer, polyolefin, polyoxadiazole, polyoxymethylene, polyphthalide, polysilazane, polysiloxane, polystyrene, polysulfide, polysulfonamide, polysulfonate, polythioester, polytriazine, polyurea, polyurethane, vinyl polymer, or a combination thereof.

21. The polyimide composition of claim 1, comprising 75 to 95 weight percent of the first polyimide;

and 2 to 25 weight percent of the second polyimide.

22. The polyimide composition of claim 1, wherein at least one of

the viscosity change is less than 25% after 1,800 seconds at 400°

C. and a shear rate of 640 inverse seconds;

or

the tensile elongation at break is greater than 30% at 23°

C. according to ASTM D638;

or

the unnotched Izod impact strength is at least 1,300 Joules per meter at 23°

C. according to ASTM D256;

or

the reverse notched Izod impact strength is at least 900 Joules per meter at 23°

C. according to ASTM D256.

19. (canceled)

20. (canceled)