US2015361263A1PendingUtilityA1
Flame retardant polyamide composition
Assignee: VAN DER BURGT FRANK PETER THEODORUS JPriority: Jul 27, 2011Filed: Jul 24, 2012Published: Dec 17, 2015
Est. expiryJul 27, 2031(~5 yrs left)· nominal 20-yr term from priority
B29K 2077/00C08J 5/00C08L 2205/025B29C 45/0001C08L 77/06C08J 2377/06C08J 2477/06C08L 2201/02C08K 7/14B29L 2031/36C08L 2205/02C08K 5/5313
46
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Claims
Abstract
The present invention relates to a flame retardant polyamide composition comprising (A) a semi-crystalline semi-aromatic polyamide having a melting temperature (TmA) and having a number average molecular weight in the range between 7,500 and 30,000 g/mol; (B) a semi-crystalline aliphatic polyamide having a melting temperature (TmB); and having a number average molecular weight in the range between 7,500 and 50,000 g/mol; and (C) a halogen free flame retardant system comprising a metal salt of a phosphinic acid and/or a diphosphinic acid, wherein TmA is higher than TmB and weight ratio of (A):(B) is in the range between 0:50 and 75:25. The invention also relates to a process for moulding the flame retardant polyamide composition, and moulded parts made of the flame retardant polyamide composition.
Claims
exact text as granted — not AI-modified1 . Flame retardant polyamide composition comprising
(A) a semi-crystalline semi-aromatic polyamide having a melting temperature (TmA); (B) a semi-crystalline aliphatic polyamide having a melting temperature (TmB); and (C) a halogen free flame retardant system comprising a metal salt of a phosphinic acid and/or a diphosphinic acid wherein the weight ratio of (A):(B) is in the range between 50:50 and 75:25; (A) has a number average molecular weight (Mn-A) in the range between 7,500 and 30,000 g/mol; (B) has a number average molecular weight (Mn-B) in the range between 7,500 and 50,000 g/mol; TmA is higher than TmB.
2 . Flame retardant polyamide composition according to claim 1 , wherein Mn-A is in the range of 10,000-25,000 g/mol, and/or wherein Mn-B in the range of 10,000-40,000 g/mol.
3 . Flame retardant polyamide composition according to claim 1 , wherein Tm-A is in the range of 290-350° C., and/or wherein Tm-B is in the range of 250-300° C.
4 . Flame retardant polyamide composition according to claim 1 , wherein the weight ratio of (A):(B) is in the range of 55:45 72.5:27.5.
5 . Composition according to claim 1 , wherein (A) and (B) have a negative X parameter, the X parameter being calculated for (A) and (B) by applying the method according to T. S. Ellis in Macromolecules 1991,24, 3845-3852 and using the following formula
X
blend
=
[
(
1
-
x
)
(
y
-
x
)
+
z
(
x
-
y
)
]
*
7.982
+
(
1
-
y
-
z
)
(
1
-
x
-
z
)
*
7.46
-
(
1
-
y
-
z
)
(
x
-
y
)
*
0.288
wherein x and 1-x represent the relative amounts of methylene and amide phenyl repeat units in (A), and y, z and 1-y-z represent the relative amounts of methylene, amide and phenyl repeat units in (B).
6 . Flame retardant polyamide composition according to claim 1 , wherein the flame retardant system (C) comprises an aluminium (di)phosphinate.
7 . Flame retardant polyamide composition according to claim 1 , wherein (C) is present in an amount of at least 5 wt. % and at most 30 wt. %, relative to the total weight of the composition.
8 . Composition according to claim 1 , wherein the composition comprises at most 1 wt. % ZnBorate.
9 . Flame retardant polyamide composition according to claim 1 , wherein the composition comprises inorganic fillers and/or fibrous reinforcement agents (D) in a total amount of at least 5 wt. %, relative to the total weight of the composition.
10 . Flame retardant polyamide composition according to claim 1 , comprising 5-25 wt. % of flame retardant (C), and 5-60 wt. % of glass or carbon fibre reinforcement, wherein the wt. % are relative to the total weight of the composition.
11 . Process for the production of moulded parts from a flame retardant polyamide composition by injection moulding, comprising a step wherein the composition is heated in an injection moulding machine to form a polymer melt, characterized in that the composition is a the flame retardant polyamide composition according to claim 1 comprising a semi-crystalline semi-aromatic polyamide (A) having a melting temperature (TmA); and a semi-crystalline aliphatic polyamide (B) having a melting temperature (TmB); and wherein the melt is heated to a temperature of at most 10° C. above TmA.
12 . Process according to claim 11 , wherein the polymer melt is injected into a mould with a mould temperature of at least 100° C., preferably in the range of 110 150° C.
13 . Article made from a composition according to claim 1 .
14 . Article according to claim 13 , being a plastic part for a connector.
15 . Article according to claim 13 , being a housing or a stiffener frame for an electronic device.Join the waitlist — get patent alerts
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