Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Reexamination Certificate
2001-09-25
2004-04-27
Szekely, Peter (Department: 1714)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
Reexamination Certificate
active
06727301
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to flame resistant graft polymer-modified polycarbonate moulding compositions containing phosphate compounds, which compositions exhibit excellent flame retardancy, very good mechanical properties and elevated heat resistance.
BACKGROUND OF THE INVENTION
Diphosphates are known as flame retardant additives. JP 59 202 240 describes the production of such a product from phosphorus oxychloride, diphenols such as hydroquinone or bisphenol A and monophenols such as phenol or cresol. These diphosphates may be used as flame retardants in polyamide or polycarbonate. However, this document makes no reference to improved heat resistance due to the addition of the oligomeric phosphate to polycarbonate moulding compositions.
EP-A 0 363 608 describes flame resistant polymer blends prepared from aromatic polycarbonate, copolymer or graft copolymer containing styrene together with oligomeric phosphates as flame retardant.
EP-A 0 767 204 describes flame resistant polyphenylene oxide (PPO) or polycarbonate mixtures which contain a mixture of oligophosphates (of the bisphenol A (BPA) oligophosphate type) and monophosphates as the flame retardant. Elevated flame retardant contents give rise to disadvantageous mechanical properties and reduced heat resistance.
EP-A 0 611 798 and WO 96/27600 describe moulding compositions which, in addition to polycarbonate, contain oligomeric, terminally alkylated phosphoric acid esters of the BPA type. Due to the alkylation, elevated contents are required in order to achieve effective flame retardancy, which is highly disadvantageous for many applicational properties (mechanical properties, heat resistance).
EP-A 0 754 531 describes reinforced PC/ABS moulding compositions which are suitable for precision components. Flame retardants which are used also include inter alia BPA type oligophosphates. The elevated filler contents have a highly disadvantageous effect on mechanical properties.
EP-A 771 851 describes moulding compositions which contain aromatic polycarbonate, graft polymer based on diene rubber/SAN copolymer, a phosphate and tetrafluoroethylene polymers, wherein the polycarbonate has differing molecular weights. Resistance to loss of impact strength, to heat and moisture is stated as the advantage.
EP-A 755 977 describes polymer blends prepared from aromatic polycarbonate, graft copolymer having a rubber content of <25% as well as oligomeric phosphates having an added content of <8% and an N value of N=1-35 as flame retardant additives. This document makes no reference to processability at elevated filler contents nor to weld line strength. Disadvantages with regard to flame retardancy may also be expected due to the limitation of the content of phosphates.
EP-A 747 424 describes thermoplastic resins which contain phosphate compounds having a molecular weight of approx. 500 to 2000 and of phosphate compounds having a molecular weight of approx. 2300 to 11000 as the flame retardant, wherein numerous thermoplastic resins are listed. The elevated molecular weights of the phosphorus compounds distinctly impairs flow behaviour of the moulding compositions.
SUMMARY OF THE INVENTION
The object of the present invention is to provide flame retardant, graft polymer-modified PC moulding compositions, which are distinguished by very good mechanical properties, elevated heat resistance and a low burn time in fire behaviour, as a result of which these moulding compositions are suitable for the production of housing components of a complicated geometry.
It has now been found that graft polymer-modified polycarbonate moulding compositions which contain phosphorus compounds having a selected number of repeat units have the desired range of properties.
The present invention accordingly provides graft polymer-modified polycarbonate moulding compositions containing phosphorus compounds of the formula (I)
in which
R
1
, R
2
, R
3
and R
4
are mutually independently C
1
-C
8
alkyl, optionally substituted by halogen, C
5
-C
6
cycloalkyl, C
6
-C
10
aryl or C
7
-C
12
aralkyl, each optionally substituted by halogen and/or alkyl,
n are mutually independently 0 or 1,
q are mutually independently 0, 1, 2, 3 or 4,
N is 0.6 to 4, preferably 0.9 to 2.5, in particular 1 to 1.15,
R
5
and R
6
mutually independently mean C
1
-C
4
alkyl, preferably methyl, or halogen, preferably chlorine and/or bromine,
Y means C
1
-C
7
alkylidene, C
1
-C
7
alkylene, C
5
-C
12
cyoalkylene, C
5
-C
12
cycloalkylidene, —O—, —S—, —SO—, —SO
2
— or —CO—.
DETAILED DESCRIPTION OF THE INVENTION
The thermoplastic moulding compositions preferably contain 0.5 to 20, particularly preferably 1 to 18 and in particular 2 to 16 parts by weight of phosphorus compound (I) or a mixture of phosphorus compounds (I).
Preferred thermoplastic moulding compositions are those containing
A) 40 to 99, preferably 60 to 98.5 parts by weight of aromatic polycarbonate and/or polyester carbonate
B) 0.5 to 60, preferably 1 to 40, in particular 2 to 25 parts by weight of graft polymer of
B.1) 5 to 95, preferably 30 to 80 wt. % of one or more vinyl monomers on
B.2) 95 to 5, preferably 20 to 70 wt. % of one or more grafting backbones having a glass transition temperature of <10° C., preferably of <0° C., particularly preferably of <−20° C.,
C) 0 to 45, preferably 0 to 30, particularly preferably 2 to 25 parts by weight of at least one thermoplastic polymer selected from the group comprising vinyl (co)polymers and polyalkylene terephthalates,
D) 0.5 to 20 parts by weight, preferably 1 to 18 parts by weight, particularly preferably 2 to 16 parts by weight of a phosphorus compound of the formula (I)
in which R
1
to R
6
, Y, n, N and q have the above-stated meaning,
E) 0 to 3, preferably 0.05 to 2, particularly preferably 0.1 to 0.8 parts by weight of fluorinated polyolefin.
Component A
Component A aromatic polycarbonates and/or aromatic polyester carbonates which are suitable according to the invention are known from the literature or may be produced using processes known from the literature (c.f. in relation to the production of aromatic polycarbonates, for example Schnell,
Chemistry & Physics of Polycarbonates,
Interscience Publishers, 1964 and DE-AS 1 495 626, DE-OS 2 232 877, DE-OS 2 703 376, DE-OS 2 714 544, DE-OS 3 000 610, DE-OS 3 832 396; in relation to the production of polyester carbonates for example DE-OS 3 077 934).
Aromatic polycarbonates are produced for example by reacting diphenols with carbonic acid halides, preferably phosgene, and/or with aromatic dicarboxylic acid dihalides, preferably benzenedicarboxylic acid dihalides, by the phase interface process, optionally using chain terminators, for example monophenols, and optionally using trifunctional or greater than trifunctional branching agents, for example triphenols or tetraphenols.
Diphenols for the production of the aromatic polycarbonates and/or aromatic polyester carbonates are preferably those of the formula (III)
wherein
A means a single bond, C
1
-C
5
alkylene, C
2
-C
5
alkylidene, C
5
-C
6
cycloalkylidene, —O—, —SO—, —CO—, —S—, —SO
2
—, C
6
-C
12
arylene, onto which further aromatic rings optionally containing heteroatoms may be fused, or a residue of the formula (IV) or (V)
B in each case is C
1
-C
12
alkyl, preferably methyl, halogen, preferably chlorine and/or bromine
x in each case mutually independently is 0, 1 or 2,
p is 1 or 0 and
R
7
and R
8
mutually independently, individually selectably for each X
1
, mean hydrogen or C
1
-C
6
alkyl, preferably hydrogen, methyl or ethyl,
X
1
means carbon and
m means an integer from 4 to 7, preferably 4 or 5, providing that R
7
and R
8
are simultaneously alkyl on at least one atom X
1
.
Preferred diphenols are hydroquinone, resorcinol, dihydroxydiphenols, bis-(hydroxyphenyl)-C
1
-C
5
-alkanes, bis-(hydroxyphenyl)-C
1
-C
6
-cycloalkanes, bis-(hydroxyphenyl) ethers, bis-(hydroxyphenyl) sulfoxides, bis-(hydroxyphenyl) ketones, bis-(hydroxyphenyl) sulfones and &agr;,&agr;-bis-(hydroxyphenyl)diisopropyl-benzenes tog
Derr Torsten
Eckel Thomas
Öller Manfred
Wittmann Dieter
Zobel Michael
Bayer Aktiengesellschaft
Franks James R.
Gil Joseph C.
Szekely Peter
LandOfFree
Flame-resistant, impact-resistant modified polycarbonate... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Flame-resistant, impact-resistant modified polycarbonate..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Flame-resistant, impact-resistant modified polycarbonate... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3212205