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
1991-02-19
1993-01-05
Michl, Paul R.
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...
524474, 524481, 524515, 524525, C08K 501
Patent
active
051771390
DESCRIPTION:
BRIEF SUMMARY
Molding compound made of elastomeric polyolefin rubbers, polyethylene and/or ethylene copolymers and additives as well as its use for elastic sealing strips.
BACKGROUND OF THE INVENTION
The invention relates to a molding compound according to the generic part of claim 1 and its use for elastic clamp-proof courses as well as to its use for elastic sealing strips.
Strip and foil material for providing seals in building construction, underground structures and engineering work must possess a series of different properties to ensure that structures remain watertight and weatherproof. These properties include high mechanical strength and adequate elongation both at room temperatures and at temperatures of up to about 80.degree. C., long-term stability, the ability to join large areas to each other, resistance to aging and biological resistance. Sealing strips varying widely in composition, based upon thermoplastic synthetic materials, vulcanizable or vulcanized elastomers, and thermoplastic synthetic materials having elastomeric properties are already known, but although they have advantageous properties, they also have disadvantages (see for example: DE-AS 15 70 352, DE-AS 15 95 442, DE-OS 22 19 147, DE-24 10 572-A1, DE-24 15 850-A1, DE-25 10 162-A1, DE-26 21 825-B2, DE-26 28 741-A1 and DE-26 57 272-A1).
Although known thermoplastic sealing strips, based for example upon plasticized polyvinylchloride, polyisobutylene, acrylic polymers, or thermoplastics modified with bitumen may be simply and effectively welded to seams, they are sensitive to the effects of temperatures. Attempts are made to counteract these disadvantages by coating or incorporating fabrics or fleeces made of textile or glass fibers, but this has been only partly successful.
Although known sealing strips made of vulcanizable synthetic materials, e.g. based upon chloroprene rubber, ethylene propylene diene terpolymers, chlorosulfonated polyethylene rubber, or butyl rubber meet mechanical strength requirements at room temperature and are weatherproof, they have considerable disadvantage, however. Unvulcanized foils (e.g. EP-OS 0 082 490) do not meet mechanical demands at elevated temperatures and vulcanized sealing strips cannot be welded together, but can be permanently joined together only with difficulty by means of adhesive, adhesive tape or the like (see for example DE-OS 25 10 162).
There has recently been a change from the plastic sealing strips described hereinbefore, made of a single layer of one material, possibly with a reinforcing insert, to multilayer sealing strips made of vulcanizable materials. The outer layers are either unvulcanized or are vulcanized only to the extent that they can be welded by heat, by a solvent, or by a solvent welding agent, and at least one vulcanized layer is provided, see for example AT-PS 290 612 and DE-OS 26 28 741. The disadvantage, however, is that the process is dependent upon the type and amount of vulcanizing accelerator used and the time required for complete vulcanization.
DE-OS 22 19 147 discloses a sealing strip based upon EPDM. In addition to EDPM it contains polyethylene, polyisobutylene and fillers. At room temperature the elongation at rupture amounts to between 500 and 600%. At elevated temperatures such foils exhibit very low tensile strength and elongation at rupture.
DE-OS 24 10 572 discloses a sealing strip based upon polystyrene polybutadiene block copolymers having a greater elongation at rupture of max. 210% at 80.degree. C. Such foils have unsatisfactory resistance to light and ozone.
Also known from DE-OS 26 21 825 is a sealing foil based upon polystyrene polybutadiene block copolymers with additions of chlorosulfonated polyethylene with very high elongation at rupture up to 660% at 80.degree. C. However, when fillers are added, this value drops to less than 300%. It may also be gathered from this reference that the addition of polyethylene instead of chlorsulfonated PE produces poor elongation at rupture at 80.degree. C.
DE-OS 26 57 272 discloses a thermoplastic compound for
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Klaar Karlo
Spielau Paul
Cain Edward
Huels Troisdorf Aktiengesellschaft
Michl Paul R.
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