Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Reexamination Certificate
2000-05-11
2003-11-25
Buttner, David J. (Department: 1712)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
C525S064000, C525S067000
Reexamination Certificate
active
06653391
ABSTRACT:
The invention relates to impact-modified polyesters and polyester/polycarbonate blends.
Polymer mixtures are attracting increasing interest in industry because of the tailored combinations of properties which they offer. Of particular interest here are polymer mixtures made from incompatible polymers, which have unusual combinations of properties.
Polymer mixtures based on polyesters and polycarbonates have been known for a long time. The products which are important industrially also contain impact modifiers to improve their toughness, particularly at low temperatures, use being made in particular of butadiene-styrene-methyl methacrylate rubbers, butyl rubber, acrylate graft rubbers and ethylene copolymers with polar comonomers.
U.S. Pat. No. 4,764,556 describes thermoplastic molding compositions which contain a blend made from: two different polyesters, a polycarbonate and an elastomeric polymer with a glass transition temperature of less than −30° C. The rubber component used is an ethylene-n-butyl acrylate-acrylic acid copolymer or an ethylene-n-butyl acrylate-glycidyl methacrylate copolymer or a graft copolymer which has a shell of styrene-acrylonitrile or methyl methacrylate.
JP-A 5 83/098 357 has disclosed molding compositions which have polycarbonate, an aromatic polyester, a butyl rubber and an acrylic elastomer. The butyl rubber is preferably obtained from isobutene and isoprene.
The acrylic elastomer is preferably obtained by emulsion polymerization of alkyl acrylates, butadiene and methyl methacrylate.
DE-A 33 02 124 has disclosed thermoplastic molding compositions which comprise polycarbonates, polyalkenyl terephthalates, elastomeric graft polymers and terpolymers of acrylate, vinyl ester and unsaturated nitrites.
EP-B 0 133 993 has disclosed resin mixtures which encompass a polyester, a polycarbonate and a regulator combination. The regulator combination comprises a graft copolymer with an alkyl acrylate core and olefin copolymers which comprise alkyl acrylate, alkyl methacrylate, acrylic acid, methacrylic acid or mixtures of these.
Blends based on polyesters and styrene copolymers are likewise known.
EP-A-0 310 976 describes glass-fiber-reinforced thermoplastic molding compositions based on polyesters and graft polymers, and the preparation of these. The molding compositions comprise, besides polyesters and styrene-acrylonitrile copolymers, graft polymers based on acrylate rubbers. Mixtures of polyesters and at least 2 rubbers of different particle sizes are also known, from DE-A-37 33 839 and have good toughness.
In order to meet the ever-more-complex requirements placed upon polymer mixtures, there is a need for improved polymer mixtures based on polyesters and, if desired, polycarbonates and/or styrene copolymers and having good low-temperature impact strength and good dimensional stability and resistance to weathering.
It is an object of the present invention to provide thermoplastic molding compositions which comprise polyesters and, if desired, polycarbonates and/or styrene copolymers, which avoid the disadvantages of known molding compositions, and which in particular have good heat resistance, weathering resistance and dimensional stability. They should also have good notched impact strength.
We have found that this object is achieved by providing thermoplastic molding compositions comprising, based on the total weight of components A, C and, if desired, B and D to G, which is 100% by weight in total,
a: as component A, from 1 to 99% by weight of at least one polyester,
b: as component B, from 0 to 98% by weight of at least one polycarbonate,
c: from 1 to 80% by weight of a graft copolymer C made from components C1, C2 and C3, the total weight of which is 100% by weight,
cl: as component C1, from 1 to 95% by weight of a graft base made from a material with a glass transition temperature of at least 25° C. and with an average particle size of at least 50 nm, built up from components C11 to C14, the total weight of which is 100% by weight,
c11:as component C11, from 50 to 99.9% by weight of at least one vinylaromatic monomer,
c12:as component C12, from 0 to 49.9% by weight of at least one monomer copolymerizable with the monomers C11,
c13:from 0.1 to 25% by weight of a crosslinking component C13 made from
&agr;) from 0.1 to 100% by weight of dihydrodi-cyclopenta dienyl acrylate
&bgr;) from 0 to 99.9% by weight of at least one other crosslinking agent having two or more functional groups of differing re-activity and
c14:from 0 to 25% by weight of at least one crosslinking agent C14 having two or more functional groups of the same reactivity,
c2:as component C2, from 4.9 to 98.9% by weight of a graft made from a material with a glass transition temperature of not more than 0° C., built up from components C21 to C23, the total weight of which is 100% by weight,
c21:as component C21, from 50 to 100% by weight of at least one alkyl acrylate,
c22:as component C22, from 0 to 50% by weight of at least one monomer copolymerizable with the monomers C21 and
c23:from 0 to 20% by weight of at least one crosslinking agent C13 &agr; and/or &bgr; or a mixture of these, and
c3:as component C3, from 0.1to 90% by weight of at least one other graft,
d :as component D, from 0 to 80% by weight of at least one styrene copolymer,
e: as component E, from 0 to 30% by weight of at least one rubber,
f: as component F, from 0 to 60% by weight of at least one fibrous or particulate filler, and
g: as component G, from 0 to 20% by weight of other additives.
It has been found that adding the specific graft copolymers of component C gives the molding compositions advantageous properties.
The novel molding compositions may be used for a wide variety of applications, for example for producing moldings for household items, automotive applications, electronic components and medical engineering equipment.
The individual components are described in more detail below.
Component A
The polyesters of component A are present in the thermoplastic molding compositions in amounts of from 1 to 99% by weight. If the molding compositions contain polycarbonate B, then component A is preferably present in amounts of from 15 to 80% by weight, particularly preferably from 20 to 70% by weight. If no polycarbonate of component B is present, then the proportion of component A is preferably from 25 to 88%, particularly preferably from 40 to 77% by weight.
The polyester is preferably derived from an aromatic dicarboxylic acid.
The aromatic ring of the dicarboxylic acid here may be further substituted, for example by halogen, such as chlorine or bromine, or C
1
-C
4
-alkyl, such as methyl, ethyl, isopropyl, n-propyl, n-butyl, isobutyl or tert-butyl. The aromatic dicarboxylic acids may be o-, m- or p-dicarboxylic acids or mixtures of these. They are preferably p-dicarboxylic acids. Preferred dicarboxylic acids are naphthalenedicarboxylic acid, terephthalic acid or isophthalic acid, or also mixtures of these. Up to 10 mol % of the aromatic dicarboxylic acids here may be replaced by aliphatic or cycloaliphatic dicarboxylic acids, such as adipic acid, azelaic acid, sebacic acid, dodecanedioic acids and cyclohexanedicarboxylic acids. It is also possible to use solely aliphatic dicarboxylic acids, but this is not preferred according to the invention.
Possible aliphatic dihydroxy compounds are in particular diols having from 2 to 6 carbon atoms, in particular 1,2-ethanediol, 1,4-butanediol, 1,6-hexanediol, 1,4-hexanediol, 1,4-cyclohexanediol, neopentyl glycol and mixtures of these. Examples of aromatic dihydroxy compounds which may be used are those based on diphenols of the formula I.
HO—H
4
C
6
—A—C
6
H
4
—OH (I)
where A is a single bond, C
1
-C
3
-alkylene, C
2
-C
3
-alkylidene or C
3
-C
6
-cycloalkylidene, which may be substituted with up to 4 alkyl radicals, and in particular 2,2,4-trimethylolcyclohexylidene, or S or SO
2
. Examples of preferred biphenols of the formula I are 4,4′-dihydroxybiphenyl, 2,2-bis (4-hydroxyphenyl)propane, 2,4-bis(4-hydroxyphenyl)-2-methylbutane, 1,1-bis(4-hydroxyphen
Blinne Gerd
Fischer Michael
Weber Martin
BASF - Aktiengesellschaft
Buttner David J.
Keil & Weinkauf
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