Fire-retardant composition of an alloy of polyamide and polyester resins

• US 9,765,217 B2
• Filed: 08/20/2012
• Issued: 09/19/2017
• Est. Priority Date: 08/26/2011
• Status: Active Grant

• Current Assignee: Performance Polyamides, SAS
• Original Assignee: Rhodia Operations (Solvac SA)
• Inventors: Lim, Mok-Keun
• Primary Examiner(s): Rodd, Christopher M
• Application Number:
  US14/241,335
• Publication Number:
  US 20140378583A1
• Time in Patent Office: 1,856 Days
• Field of Search: 524100, 524101, 524126-154, 524414, 524494, 524496
• CPC Class Codes: C08K 2003/026 Phosphorus
• CPC Class Codes: C08K 3/02 Elements
• CPC Class Codes: C08K 5/0066 Flame-proofing or flame-retarding additives
• CPC Class Codes: C08K 5/51 Phosphorus bound to oxygen
• CPC Class Codes: C08K 7/02 Fibres or whiskers
• CPC Class Codes: C08K 7/14 Glass
• CPC Class Codes: C08L 2201/02 Flame or fire retardant/resistant
• CPC Class Codes: C08L 2207/20 Recycled plastic
• CPC Class Codes: C08L 23/0869 Acids or derivatives thereof
• CPC Class Codes: C08L 67/00 Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain of polyester-amides C08L77/12; of polyester-imides C08L79/08; Compositions of derivatives of such polymers
• CPC Class Codes: C08L 67/02 Polyesters derived from dicarboxylic acids and dihydroxy compounds C08L67/06 takes precedence
• CPC Class Codes: C08L 77/00 Compositions of polyamides obtained by reactions forming a carboxylic amide link in the main chain of polyhydrazides C08L79/06; of polyamideimides or polyamide acids C08L79/08; Compositions of derivatives of such polymers
• CPC Class Codes: C08L 77/06 Polyamides derived from polyamines and polycarboxylic acids C08L77/10 takes precedence

Abstract

The present invention relates to a composition comprising at least a thermoplastic polyamide resin, a thermoplastic polyester resin, a reinforcing or bulking filler and a fire retardant. Said composition does not comprise any compatibilizer for the polyamide and the polyester, such as an agent of polymeric type, and especially no epoxy resin. Such a fire-retardant polyamide/polyester composition shows good compatibility and good mechanical and fire-retardant properties, especially a good capacity not to form flames in the presence of glowing agents, for example in the field of domestic electrical appliances, electrics and electronics.

Claims

1. A composition consisting of:

(a) from 40 to 70% by weight (wt %) of a thermoplastic polyamide resin;

(b) from 5 to 40 wt % of a thermoplastic polyester resin;

(c) a reinforcing or bulking filler;

(d) a fire retardant; and

(e) an impact modifier consisting of ethylene/acrylic ester/maleic anhydride terpolymer,

wherein the amount of (a) to (e) total 100 wt % based on the composition, and the composition does not comprise any epoxy resin compatibilizer for the polyamide and the polyester.

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

3. The composition as claimed in claim 1, wherein said polyester resin or more compounds 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-sodiumsulfoisophthalate), polybutylene (terephthalate/5-sodiumsulfoisophthalate), polypropylene terephthalate, polyethylene naphthalate, and polycyclohexanedimethylene terephthalate.

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

5. The composition as claimed in claim 1, wherein the reinforcing or bulking filler is a fibrous filler.

6. The composition as claimed in claim 5, wherein the fibrous filler is selected from the group consisting of:

glass fibers, carbon fibers, natural fibers, aramid fibers, and nanotubes.

7. The composition as claimed in claim 1, wherein the reinforcing or bulking filler is present in an amount ranging from 1% to 60% by weight of the composition.

8. The composition as claimed in claim 1, wherein the fire retardant is selected from the group consisting of:

phosphorus-bearing fire retardants;

fire retardants of organonitrogen compound; and

halogenated fire retardants.

9. The composition as claimed in claim 1, wherein the fire retardant is a combination of phosphorus-bearing compounds, and nitrogenous derivatives.

10. The composition as claimed in claim 8, wherein the fire retardant is at least one phosphorous-bearing fire retardant selected from the group consisting of phosphine oxides, phosphonic acids or salts thereof, phosphinic acids or salts thereof, cyclic phosphonates, organic phosphates, inorganic phosphates, and red phosphorus.

11. The composition as claimed in claim 8, wherein the fire retardant is an organonitrogen compound selected from the group consisting of triazines, cyanuric acid and/or isocyanuric acid, tri(hydroxyethyl) isocyanurate, benzoguanamine, guanidine, allantoin, glycoluril, and melamine or derivatives thereof selected from the group consisting of melamine cyanurate, melamine oxalate, melamine phthalate, melamine borate, melamine sulfate, melamine phosphate, melamine polyphosphate, melamine pyrophosphate, melem, melam, and melon.

12. The composition as claimed in claim 1, wherein the fire retardant is at least one halogenated fire retardant selected from the group consisting of brominated fire retardants and chlorinated fire retardants.

13. The composition as claimed in claim 9, wherein the fire retardant is a combination of:

a phosphorus-bearing compound, selected from phosphine oxides, phosphonic acids or salts thereof, phosphinic acids or salts thereof, and cyclic phosphonates, and

a nitrogenous derivative selected from melam, melem, melamine phosphate, melamine polyphosphates, melamine pyrophosphates, and ammonium polyphosphates.

14. The composition as claimed in claim 1, wherein the composition has a flame retardancy rating of V-0 according to UL 94, 0.8 mm.

15. The composition as claimed in claim 1 wherein the fire retardant is present in an amount ranging from 1-10 wt. % of the composition.