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...
Patent
1999-01-25
2000-08-15
Warzel, Mark L.
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...
52 67, 52 71, 52 74, 52 84, 52 86, C08L 5104
Patent
active
06103813&
DESCRIPTION:
BRIEF SUMMARY
The invention relates to covering grid plates for ventilator openings. The invention relates in particular to covering grid plates with high weathering resistance together with yellowing resistance, high surface quality and low tendency to develop weld lines.
Various materials have hitherto been used for producing ventilator grids or ventilator gratings. Use has been made, for example, of steel plate, but this offers only limited possibilities for shaping. In addition, steel plate is susceptible to corrosion and tends to create noise (rattle) when a ventilator is operating.
ABS (acrylonitrile/butadiene/styrene copolymer) and HIPS (high-impact polystyrene) are also used. Yellowing resistance is not adequate for every application. Yellowing is associated with a fall-off in the toughness of the material, and also with a roughening of the surface. Long exposures to heat cause a fall-off in strength, and in many instances therefore mechanical strength becomes inadequate if such exposure is prolonged.
Another material used is PVC (polyvinyl chloride). As well as the disadvantages resulting from its chlorine content, PVC is difficult to injection mold. In addition, PVC has low heat resistance.
It is an object of the present invention to provide covering grid plates for ventilator openings which have high yellowing resistance and high weathering resistance. Another object of the present invention is to provide covering grid plates for ventilator openings which, in their manufacture, have little tendency to develop weld lines, and also have high surface quality. A further object of the invention is to provide covering grid plates for ventilator openings which avoid the disadvantages of the known covering grid plates.
We have found that this object is achieved by using a molding composition which differs from ABS and comprises, based on the total of the amounts of components A and B, and, if desired, C and/or D, which is 100% by weight in total, polymer with a glass transition temperature of below 0.degree. C. and with a median particle size of from 50 to 1000 nm, partly crystalline polymer, fillers or mixtures of these
The thermoplastic molding compositions used according to the invention for producing the novel covering grid plates are known per se. Molding compositions which can be used according to the invention are described, for example, 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 differing from ABS and used according to the invention for producing the novel covering grid plates comprise the components listed below: A and B, and, if desired, C and/or D, as defined further below. Based on a total of 100% by weight of amounts of components A and B, and, if desired, C and/or D, they comprise weight, in particular from 25 to 50% by weight, of a particulate emulsion polymer with a glass transition temperature of below 0.degree. C. and with a median particle size of from 50 to 1000 nm, preferably from 50 to 55 nm, weight, in particular from 50 to 75% by weight, of at least one amorphous or partly crystalline polymer, fillers or mixtures of these.
The invention is described in more detail below.
The molding compositions used for producing the novel covering grid plates are firstly described together with the components of which these compositions are composed.
Component A is a particulate emulsion polymer with a glass transition temperature of below 0.degree. C. and with a median particle size of from 50 to 1000 nm.
Component A is preferably a graft copolymer made from particular from 55 to 65% by weight, of a particulate graft base A1 with a glass transition temperature of below 0.degree. C., particular from 35 to 45% by weight, of a graft A2 made from the 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)acrylate or mixtures of these, in particular of styrene
REFERENCES:
patent: 4914144 (1990-04-01), Muehlbach et al.
patent: 5569700 (1996-10-01), Iwakiri et al.
Bernstorff Bernd-Steffen von
Brandstetter Franz
Endemann Ulrich
Mc Kee Graham Edmund
Naarmann Herbert
BASF - Aktiengesellschaft
Warzel Mark L.
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