Composition of a blend of polyamide and polyester resins

1. A resin blend composition of a polyamide resin and of a polyester resin, the composition comprising:

a) from 1 wt. % to 98 wt. % of a thermoplastic polyamide resin;

b) from 1 wt. % to 98 wt. % of a thermoplastic polyester resin comprising a homopolymer or a copolymer that is obtained by condensation of a dicarboxylic acid or its derivatives that can form an ester, with a diol or its derivatives that can form an ester, or a mixture thereof, wherein the thermoplastic polyester resin comprises at least one C 2 -C 20 aliphatic glycol as the diol monomer;

c) from 0.01 wt. % to 10 wt. % of an epoxy resin having an epoxy equivalent weight (EEW) ranging from 2100 g/eq and 6000 g/eq; and

d) from 1 wt. % to 40 wt. % of a red phosphorus fireproofing agent,

wherein the weight percentages are based on the total weight of the composition.

2. The composition as claimed in claim 1 comprising 5.5 wt. % to 20 wt. % of the fireproofing agent.

3. The composition as claimed in claim 1 , wherein said epoxy resin comprises one or more elements selected from the group consisting of a diglycidyl ether of bisphenol A (DGEBA) epoxy resin, a diglycidyl ether of bisphenol F (DGEBF) epoxy resin, a hydrogenated bisphenol A (BPA) epoxy resin, a brominated epoxy resin, a cycloaliphatic epoxy resin, an epoxy resin of modified rubber, an aliphatic polyglycidyl epoxy resin, and a glycidyl amine epoxy resin.

4. The composition as claimed in claim 1 , wherein the epoxy equivalent weight of said epoxy resin ranges from 2500 g/eq to 6000 g/eq.

5. The composition as claimed in claim 1 , wherein said composition comprises from 0.05 wt. % to 7 wt. % of said epoxy resin.

6. The composition as claimed in claim 1 , wherein said polyamide resin comprises one or more elements selected from the group consisting of polyamide-6, polyamide-66, polyamide-610, polyamide-11, polyamide-12, polyterephthalamide, polyisophthalamide, and polyaramids.

7. The composition as claimed in claim 1 , wherein said polyester resin comprises one or more elements selected from the group consisting of polybutylene terephthalate, polybutylene (terephthalate/isophthalate), polybutylene (terephthalate/adipate), polybutylene (terephthalate/sebacate), polybutylene (terephthalate/decanedicarboxylate), polybutylene naphthalate, polyethylene terephthalate, polyethylene (terephthalate/isophthalate), polyethylene (terephthalate/adipate), polyethylene (terephthalate/5-sodium sulfoisophthalate), polybutylene (terephthalate/5-sodium sulfoisophthalate), polypropylene terephthalate, polyethylene naphthalate, and polycyclohexanedimethylene terephthalate.

8. The composition as claimed in claim 1 , wherein said polyester resin is a recycled resin.

9. The composition as claimed in claim 1 , wherein the C 2 -C 20 aliphatic glycol is selected from the group consisting of ethylene glycol, propylene glycol, 1,4-butanediol, neopentyl glycol, 1,5-pentanediol, 1,6-hexanediol, decamethylene glycol, cyclohexanedimethanol, and cyclohexanediol.

10. The composition as claimed in claim 1 , wherein the dicarboxylic acid is an aromatic dicarboxylic acid selected from the group consisting of terephthalic acid, isophthalic acid, phthalic acid, 1,4-naphthalene dicarboxylic acid, 1,5-naphthalene dicarboxylic acid, 2,6-naphthalene dicarboxylic acid, 2,7-naphthalene dicarboxylic acid, bis(p-carboxyphenyl)methane, anthracene dicarboxylic acid, 4,4′-diphenyl ether dicarboxylic acid, and 5-sodium sulfoisophthalic acid.

11. A method of preparing a resin blend composition of a polyamide resin and of a polyester resin, the method comprising mixing in the molten state:

a) from 1 wt. % to 98 wt. % of a thermoplastic polyamide resin;

b) from 1 wt. % to 98 wt. % of a thermoplastic polyester resin comprising a homopolymer or a copolymer that is obtained by condensation of a dicarboxylic acid or its derivatives that can form an ester, with a diol or its derivatives that can form an ester, or a mixture thereof, wherein the thermoplastic polyester resin obtained by condensation of at least one C 2 -C 20 aliphatic glycol as the diol monomer;

c) from 0.01 wt. % to 10 wt. % of an epoxy resin having an epoxy equivalent weight ranging from 2100 g/eq and 6000 g/eq; and

d) from 1 wt. % to 40 wt. % of a red phosphorus fireproofing agent,

wherein the weight percentages are based on the total weight of the composition.

12. The method of claim 11 comprising 5.5 wt. % to 20 wt. % of the fireproofing agent.

13. The method of claim 11 , wherein the C 2 -C 20 aliphatic glycol is selected from the group consisting of ethylene glycol, propylene glycol, 1,4-butanediol, neopentyl glycol, 1,5-pentanediol, 1,6-hexanediol, decamethylene glycol, cyclohexanedimethanol, and cyclohexanediol.

14. The method of claim 11 , wherein the dicarboxylic acid is an aromatic dicarboxylic acid selected from the group consisting of terephthalic acid, isophthalic acid, phthalic acid, 1,4-naphthalene dicarboxylic acid, 1,5-naphthalene dicarboxylic acid, 2,6-naphthalene dicarboxylic acid, 2,7-naphthalene dicarboxylic acid, bis(p-carboxyphenyl)methane, anthracene dicarboxylic acid, 4,4′-diphenyl ether dicarboxylic acid, and 5-sodium sulfoisophthalic acid.

15. A method of improving compatibility of a resin blend composition comprising a thermoplastic polyamide resin, a thermoplastic polyester resin, and a red phosphorus fireproofing agent, the method comprising adding an epoxy resin having an epoxy equivalent weight ranging from 2100 g/eq and 6000 g/eq to improve the compatibility of the resin blend composition.

16. A resin blend composition of a polyamide resin and of a polyester resin, the composition comprising:

a) from 1 wt. % to 98 wt. % of a thermoplastic polyamide resin selected from polyamide-6, polyamide-66, polyamide-66/6, and mixtures thereof;

b) from 1 wt. % to 98 wt. % of a thermoplastic polyester resin selected from polybutylene terephthalate, polyethylene terephthalate, and mixtures thereof;

c) from 0.1 wt. % to 5 wt. % of an epoxy resin selected from a diglycidyl ether of bisphenol A (DGEBA) having an epoxy equivalent weight (EEW) ranging from 2100 g/eq and 6000 g/eq; and

d) from 1 wt. % to 40 wt. % of a red phosphorus fireproofing agent,

wherein the weight percentages are based on the total weight of the composition.

17. The composition as claimed in claim 16 comprising 5.5 wt. % to 20 wt. % of the fireproofing agent.