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| Thermoplastic elastomer composition |
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| Vinylcyclohexane--based polymer/copolymer mixture and stabilizer system |
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Addition curable compositions curable to high tensile strength, tack free compositions through appropriate filler selection
| Details |
Inventors: Kalinowski, Robert Edward; Tomalia, Mary Kay; Wolf, Andreas Thomas Franz;
Assignee: Dow Corning GmbH & Dow Corning Corporation (Midland, MI)
Primary Examiner: Glass; Margaret W.
Assistant Examiner:
Attorney, Agent or Firm: Scaduto; Patricia M.
This invention relates to the preparation of an addition curable composition curable to a high tensile strength, tack free composition. The addition curable composition comprises an organic polymer having on average at least 1.4 alkenyl groups per molecule, a crosslinker having on average at least 1.4 hydrosilyl groups per molecule, a platinum group metal-containing catalyst and a specific ratio of a fatty acid treated, precipitated calcium carbonate filler having an average particle size in the range of 0.05 to 1 micron and a ground filler selected from the group consisting of calcium carbonate, kaolin clay and amorphous, non quartz silica each having an average particle size in the range of 0.2 to 40 microns. |
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DETAILED DESCRIPTION OF THE INVENTION This invention relates to an addition curable composition comprising a product formed from components comprising: (A) 100 parts by weight of an organic polymer having on average at least 1.
4 alkenyl groups per molecule; (B) an amount sufficient to cure the composition of a crosslinker having on average at least 1.
4 hydrosilyl groups per molecule; (C) a platinum group metal-containing catalyst in an amount sufficient to effect curing of the composition; (D) 25 to 250 parts by weight of a fatty acid treated, precipitated calcium carbonate filler having an average particle size in the range of 0.
05 to 1 micron; and (E) 25 to 125 parts by weight of a ground filler selected from the group consisting of calcium carbonate, kaolin clay and amorphous, non quartz silica each having an average particle size in the range of 0.
2 to 40 microns; provided, that the ratio of fatty acid treated precipitated calcium carbonate filler to ground filler is from 10:1 to 1:5.
Component (A) is an organic polymer having on average at least 1.
4 alkenyl groups per molecule.
The organic polymer may be linear or branched and may be a homopolymer, copolymer or terpolymer.
The organic polymer may also be present as a mixture of different organic polymers so long as there is on average at least 1.
4 alkenyl groups per polymer molecule.
Specific examples of the polymer chain include a polyether such as polyoxyethylene, polyoxypropylene, polyoxytetramethylene, polyoxyethylene-polyoxypropylene; a polyester prepared by a condensation of a dibasic acid such as adipic acid and a glycol or by a ring-opening polymerization of lactones; ethylene-propylene copolymer; a polybutylene such as polyisobutylene; a copolymer of isobutylene with isoprene or the like; polychloroprene; polyisoprene; a copolymer of isoprene with butadiene, acrylonitrile, styrene or the like; polybutadiene; a copolymer of butadiene with styrene, acrylonitrile or the like; and a polyolefin prepared by hydrogenating polyisoprene, polybutadiene, or a copolymer of isoprene or butadiene with acrylonitrile, styrene or the like
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