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
2001-04-05
2003-05-20
Wu, David W. (Department: 1713)
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...
C525S067000, C525S071000, C525S084000, C525S086000, C119S416000, C119S516000
Reexamination Certificate
active
06566436
ABSTRACT:
The invention relates to moldings for the garden sector or animal-keeping sector. In particular, it relates to moldings of this type which have high stability, good chemicals resistance, and good yellowing resistance, together with high dimensional stability. Materials used hitherto have a large number of disadvantages. Wood has insufficient weathering resistance and is susceptible to mold and rot, and to damage due to biting by small animals or to consumption by insects. High maintenance costs are unavoidable.
Sheet steel has a high density and is therefore heavy. It is susceptible to corrosion and difficult to work with
ABS (acrylonitrile-butadiene-styrene) polymers do not always have adequate scratch resistance, and they embrittle rapidly in outdoor applications as a result of post crosslinking of the butadiene double bonds. This is associated with impairment of mechanical properties, in particular of toughness. The moldings exhibit discoloration and bleaching Swelling performance with respect to alcohols and to cleaning compositions is inadequate, and discoloration occurs in contact with gasoline.
ASA (acrylonitrile-styrene-acrylate) molding compositions exhibit good stress cracking performance, but their scratch resistance, color depth and toughness/stiffness ratio are not adequate for every application, and the preparation of a blend via addition of small amounts of polycarbonate does not give any adequate improvement.
It is an object of the present invention, therefore, to provide moldings for the garden sector or animal-keeping sector which are stable and chemicals-resistant, and which do not yellow, for use in producing filters, pumps, or motors. The housings or protective coverings should also be scratch-resistant and have good dimensional stability. Their UV resistance and heat-aging resistance should be high, so that their surface gloss is also retained. Other requirements are good recyclability and good flame retardancy, and also good dimensional stability under thermal stress during production and use.
We have found that this object is achieved by the use of a thermoplastic molding composition which is not ABS and which comprises, based on the total of the amounts of components A, B, C, and, where appropriate, D, this total being 100% by weight,
a: as component A, from 1 to 48% by weight of at least one particulate emulsion polymer which has one or more phases and has a glass transition temperature below 0C in at least one phase, and has a median particle size from 50 to 1000 nm,
b: as component B, from 1 to 48% by weight of at least one amorphous or semicrystalline polymer,
c: as component C, from 51 to 98% by weight of polycarbonates, and
d: as component D, from 0 to 47% by weight of conventional additives and/or fibrous or particulate fillers, or a mixture of these,
for producing moldings and semi-finished products for the garden sector or animal-keeping sector.
Glass transition temperatures given for phases are based on a polymer whose makeup corresponds to that of the phase in question.
The moldings described for the garden sector or animal-keeping sector are scratch-resistant, stable, and chemicals-resistant. They also have very good yellowing resistance and depth of color.
The components of the thermoplastic molding compositions used according to the invention to produce the moldings of the invention for the garden sector or animal-keeping sector are known per se. Examples of descriptions of molding compositions and components which can be used according to the invention are found in DE-A-12 60 135, DE-C-19 11 882, DE-A-28 26 925, DE-A-31 49 358, DE-A-32 27 555 and DE-A-40 11 162.
In one embodiment, the molding compositions which are not ABS and which are used according to the invention for producing the moldings of the invention for the garden sector or animal-keeping sector comprise the components listed below and as defined hereinafter: A, B, C, and, where appropriate, D. Based on the total of the amounts of components A, B, C, and, where appropriate, D, this total being 100% by weight, they comprise
a: as component A, from 1 to 48% by weight, preferably from 3 to 35% by weight, in particular from: 5 to 30% by weight, of a particulate emulsion polymer which has a glass transition temperature below 0° C., and has a median particle size from 50 to 1000 nm, preferably from 5 to 800 nm,
b: as component B, from 1 to 48% by weight, preferably from 5 to 40% by weight, in particular from 5 to 35% by weight, of at least one amorphous or semicrystalline polymer,
c: as component C, from 51 to 98% by weight, preferably from 55 to 90% by weight, in particular from 60 to 85% by weight, of polycarbonates, and
d: as component D, from 0 to 47% by weight, preferably from 0 to 37% by weight, in particular from 0 to 30% by weight, of additives or a mixture of these.
The invention is described in more detail below.
The molding compositions used for producing the moldings of the invention for the garden sector or animal-keeping sector are first described, together with the components of which they are composed.
Component A
Component A is at least one particulate emulsion polymer which has one or more phases and has a glass transition temperature below 0° C. in at least one phase, and has a median particle size of from 50 to 1000 nm.
Component A is preferably a polymer having more than one phase and made from
a1: from 1 to 99% by weight, preferably from 15 to 80% by weight, in particular from 40 to 65% by weight, of a particulate first phase A
1
with a glass transition temperature below 0° C.,
a2: from 1 to 99% by weight, preferably from 20 to 85% by weight, in particular from 35 to 60% by weight, of a second phase A2 made from the following monomers, based on A2,
a21: as component A21, from 40 to 100% by weight, preferably from 65 to 85% by weight, of units of a vinylaromatic monomer, preferably of styrene, of a substituted styrene, or of a (meth)acrylic ester or a mixture of these, in particular of styrene and/or of &agr;-methylstyrene, and
a22: as component A22, from 0 to 60% by weight, preferably from 15 to 35% by weight, of units of an ethylenically unsaturated monomer, preferably of acrylonitrile or of methacrylonitrile, in particular of acrylonitrile, and
a3: as component A3, from 0 to 50% by weight of a third is phase with a glass transition temperature above 0° C., where the total amount of components A1, A2, and A3 is 100% by weight.
The phases here may be bonded to one another by graft copolymerization. For example, the first phase A1 here may form the graft base and the second phase A2 may form a graft. A number of phases may be provided, giving a graft copolymer with a graft base and a number of grafts. The graft does not necessarily need to be in the form of a shell around the graft core. A variety of geometries is possible: for example, the second phase A2 may cover a part of the first phase A1, or interpenetrating networks may form, etc. It is particularly preferable for the first phase A1 to have a glass transition temperature below −10
20
C., in particular below −15° C. The third phase preferably has a glass transition temperature above 60° C. The amount present of this third phase may be from 1 to 50% by weight, in particular from 5 to 40% by weight, for example, based on component A.
In the text below, “first phase” means the same as “graft base”, and correspondingly “second phase” means the same as “craft”
The third phase may preferably have been built up from more than 50% by weight of styrene, in particular from more than 80% by weight of styrene, based on the total value for the monomers of the third phase.
In one embodiment of the invention, component A1 is composed of the following monomers
a11: as component A11, from 80 to 99.99% by weight, preferably from 95 to 99.9% by weight, of a C
1
-C
6
-alkyl acrylate, preferably n-butyl acrylate and/or ethylhexyl acrylate,
a12: as component A12, from 0.01 to 20% by weight, preferably from 0.1 to 5.0% by weight, of at least one polyfunctional crosslinking monomer.
In one embodiment of the inve
Görrissen Heiner
Güntherberg Norbert
Mc Kee Graham Edmund
Niessner Norbert
Weber Martin
BASF - Aktiengesellschaft
Cheung William
Keil & Weinkauf
Wu David W.
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