Herbicidal mixtures exhibiting a synergistics effect

Details Herbicidal mixtures exhibiting a synergistics effect Herbicidal mixtures exhibiting a synergistics effect

2001-02-08

2002-08-13

Boykin, Terressa M. (Department: 1711)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

Reexamination Certificate

active

06433082

ABSTRACT:

The present invention relates to moulding compositions which are treated with phosphazenes and are based on polycarbonate and graft polymers chosen from the group consisting of silicone rubbers, EP(D)M rubbers and acrylate rubbers as the graft base, and which have an excellent flameproofing and very good mechanical properties, such as resistance to stress cracking or notched impact strength.
DE-A 196 16 968 describes polymerizable phosphazene derivatives, processes for their preparation and their use as curable binders for paints, coatings, fillers, stopping compositions, adhesives, mouldings or films.
WO 97/400 92 describes flameproofed moulding compositions of thermoplastic polymers and unsubstituted phosphazenes (PN
n−x
H
1−y
type).
EP-A 728 811 describes a thermoplastic mixture comprising aromatic polycarbonate, graft copolymer based on dienes, copolymer and phosphazenes which has good flameproofing properties, impact strength and heat distortion resistance.
The object of the present invention is to provide polycarbonate moulding compositions with an excellent flame resistance and excellent mechanical properties, such as notched impact strength and stability to stress cracking. This spectrum of properties is required in particular for uses in the field of data technology, such as, for example, for housings for monitors, printers, copiers and the like.
It has now been found that moulding compositions which are based on polycarbonate and graft polymers chosen from the group consisting of silicone rubbers, EP(D)M rubbers and acrylate rubbers and comprise phosphazenes have the desired properties.
The invention therefore provides thermoplastic moulding compositions comprising
A) polycarbonate and/or polyester-carbonate,
B) at least one rubber-elastic graft polymer chosen from the group consisting of silicone rubbers, EP(D)M rubbers and acrylate rubbers as the graft base,
C) at least one thermoplastic polymer chosen from the group consisting of vinyl (co)polymers and polyalkylene terephthalates and
D) at least one phosphazene chosen from the group consisting of phosphazene of the formulae
 wherein
R is in each case identical or different and represents amino, C
1
- to C
8
-alkyl or C
1
- to C
8
-alkoxy, in each case optionally halogenated, preferably halogenated by fluorine, or C
5
- to C
6
-cycloalkyl, C
6
- to C
20
-aryl, preferably phenyl or naphthyl, C
6
- to C
20
-aryloxy, preferably phenoxy or naphthyloxy, or C
7
- to C
12
-aralkyl, preferably phenyl-C
1
-C
4
-alkyl, in each case optionally substituted by alkyl, preferably C
1
-C
4
-alkyl, and/or halogen, preferably chlorine and/or bromine,
k represents 0 or a number from 1 to 15, preferably a number from 1 to 10.
The invention preferably provides thermoplastic moulding compositions comprising
A) 40 to 99, preferably 60 to 98.5 parts by wt. of aromatic polycarbonate and/or polyester-carbonate
B) 0.5 to 60, preferably 1 to 40, in particular 2 to 25 parts by wt. of at least one rubber-elastic graft polymer chosen from the group consisting of silicone rubbers, EP(D)M rubbers and acrylate rubbers as the graft base,
C) 0 to 45, preferably 0 to 30, particularly preferably 2 to 25 parts by wt. of at least one thermoplastic polymer chosen from the group consisting of vinyl (co)polymers and polyalkylene terephthalates,
D) 0.1 to 50, preferably 2 to 35, in particular 5 to 25 parts by wt. of at least one component chosen from the group consisting of phosphazenes of the formulae
 wherein
R is in each case identical or different and represents amino, C
1
- to C
8
-alkyl or C
1
to C
8
-alkoxy, in each case optionally halogenated, preferably halogenated by fluorine, or C
5
- to C
6
-cycloalkyl, C
6
- to C
20
-aryl, preferably phenyl or naphthyl, C
6
- to C
20
-aryloxy, preferably phenoxy or naphthyloxy, or C
7
- to C
12
-aralkyl, preferably phenyl-C
1
-C
4
-alkyl, in each case optionally substituted by alkyl, preferably C
1
-C
4
-alkyl, and/or halogen, preferably chlorine and/or bromine,
k represents 0 or a number from 1 to 15, preferably a number from 1 to 10.
E) 0 to 5, preferably 0.1 to 1, particularly preferably 0.1 to 0.5 parts by wt. of fluorinated polyolefin.
Component A
Aromatic polycarbonates and/or aromatic polyester-carbonates according to component A which are suitable according to the invention are known from the literature or can be prepared by processes known from the literature (for the preparation of aromatic polycarbonates see, for example, Schnell, “Chemistry and 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 and DE-OS 3 832 396; for the preparation of aromatic polyester-carbonates e.g. DE-OS 3 077 934).
Aromatic polycarbonates are prepared e.g. by reaction of diphenols with carbonic acid halides, preferably phosgene, and/or with aromatic dicarboxylic acid dihalides, preferably benzenedicarboxylic acid dihalides, by the phase boundary process, optionally using chain stoppers, for example monophenols, and optionally using trifunctional or more than trifunctional branching agents, for example triphenols or tetraphenols.
Diphenols for the preparation of the aromatic polycarbonates and/or aromatic polyester-carbonates are preferably those of the formula (III)
wherein
A is 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, to which further aromatic rings optionally containing heteroatoms can be fused,
or a radical of the formula (IV) or (V)
B in each case is C
1
-C
12
-alkyl, preferably methyl, or halogen, preferably chlorine and/or bromine,
x in each case independently of one another is 0, 1 or 2,
p is 1 or 0, and
R
7
and R
8
can be chosen individually for each X
1
and independently of one another denote hydrogen or C
1
-C
6
-alkly, preferably hydrogen, methyl or ethyl,
X
1
denotes carbon and
m denotes an integer from 4 to 7, preferably 4 or 5, with the proviso that on at least one atom X
1
, R
7
and R
8
are simultaneously alkyl.
Preferred diphenols are hydroquinone, resorcinol, dihydroxydiphenols, bis-(hydroxyphenyl)-C
1-C
5
-alkanes, bis-(hydroxyphenyl)-C
5
-C
6
-cycloalkanes, bis-(hydroxyphenyl) ethers, bis-(hydroxyphenyl)-sulfoxides, bis-(hydroxyphenyl) ketones, bis-(hydroxyphenyl) sulfones and &agr;,&agr;-bis-(hydroxyphenyl)-diisopropyl-benzenes, and derivatives thereof brominated on the nucleus and/or chlorinated on the nucleus.
Particularly preferred diphenols are 4,4′-dihydroxydiphenyl, bisphenol A, 2,4-bis-(4-hydroxyphenyl)-2-methylbutane, 1,1-bis-(4-hydroxyphenyl)-cyclohexane, 1,1-bis-(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane, 4,4′-dihydroxydiphenyl sulfide, 4,4′-dihydroxydiphenyl sulfone and di- and tetrabrominated or -chlorinated derivatives thereof, such as, for example, 2,2-bis-(3-chloro-4-hydroxyphenyl)-propane, 2,2-bis-(3,5-dichloro-4-hydroxyphenyl)-propane or 2,2-bis-(3,5-dibromo-4-hydroxyphenyl)-propane.
2,2-Bis-(4-hydroxyphenyl)-propane (bisphenol A) is particularly preferred.
The diphenols can be employed individually or as any desired mixtures.
The diphenols are known from the literature or are obtainable by processes known from the literature.
Chain stoppers which are suitable for the preparation of the thermoplastic aromatic polycarbonates are, for example, phenol, p-chlorophenol, p-tert-butylphenol or 2,4,6-tribromophenol, and also long-chain alkylphenols, such as 4-(1,3-tetramethylbutyl)-phenol according to DE-OS 2 842 005, or monoalkylphenols or dialkylphenols having a total of 8 to 20 C atoms in the alkyl substituents, such as 3,5-di-tert-butylphenol, p-iso-octylphenol, p-tert-octylphenol, p-dodecylphenol and 2-(3,5-dimethylheptyl)-phenol and 4-(3,5-dimethylheptyl)-phenol. The amount of chain stoppers to be employed is in general between 0.5 mole % and 10 mole %, based on the sum of the moles of the particular diphenols employed.
The thermoplastic aromatic polycarbonates have average weight-average molecular weights (M
w
, measured e.g. by ultracentrifuge or sca

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