1. Articles in category: Summarization

    1849-1856 of 1856 « 1 2 ... 75 76 77 78
    1. Polyurethane-modified polyisocyanurate foam and a method for the preparation thereof

      This invention relates to polyurethane-modified polyisocyanurate foam having excellent flame-resistivity and non-combustibility, which is prepared from (A) at least one aromatic polyisocyanates having no ortho-substituent, (B) at least one polyhydroxyl and/or polycarboxyl compound, (C) at least one foaming agent and (D) at least one catalyst used for the trimerization of isocyanate groups. The proportions of these components satisfy the relationships: (1) the equivalent ratio, Ae/(Be+Ce+De), is more than two, and (2) the weight ratio, Bw/Aw is less than 0.4 and more than zero, wherein A, B, C and D represent the above mentioned components ...
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      Mentions: Chemistry
    2. Modifiers for high nitrile polymers

      Disclosed herein are high nitrile polymers which have been compounded with a modifier which is a combination of (1) a C.sub.12 to C.sub.28 saturated aliphatic fatty acid ester of glycerol or sorbitan and (2) a polyoxyethylene sorbitan ester. The amount of modifier used is in the range of from 0.01 to 1.0 percent by weight based on the weight of the nitrile polymer. The compounded polymers exhibit lower melt viscosity and increased melt flow. The modifiers also provide improved clarity, gloss and, in certain instances, articles molded from the compounded nitrile polymer exhibit lower ...
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      Mentions: Control Prior ArtIn
    3. Rubber composition for flexible belts

      A highly reversion resistant polyisoprene elastomer composition vulcanized with a low sulfur content is described and used in paper feed belts. The polyisoprene rubber compositions are particularly useful in the paper feed belts used to feed and transport paper in xerographic machines and paper sorting machines. The low-sulfur vulcanizate of isoprene provides high resistance to physical degradation due to dynamic mechanical stress under operating conditions.
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    4. Ethylene-propylene copolymer rubber composition having high modulus

      An ethylene-propylene copolymer rubber composition having a high Young's modulus, which comprises 100 parts by weight of a mixture of the following ingredients (a) and (b) in a weight ratio of ingredient (a)/ingredient (b) of 67/33-50/50, said ingredient (a) being an ethylene-propylene copolymer having a Mooney viscosity of at least 75, said ingredient (b) being divinylbenzene, (c) 0.3-2.5 parts by weight of an organic peroxide, and (d) 0.01-0.25 part by weight of sulfur, and the homogeneous rubber composition cured at 120.degree.-180.degree.C having a Young's modulus of 200-500 ...
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    5. Method for producing webs, panels or sandwich elements of foam plastics reinforced with rovings

      Means for producing fiber-reinforced foam plastic webs, panels, sandwich panels and the like from continuous rovings and a foam reaction mixture. Rovings are incorporated into a foam product or core by means of an air nozzle coupled to and adjustable in its position to the nozzle of a mixing head for ejecting the foam reaction mixture.
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    6. Plastics stabilized against ultraviolet radiation

      Thermoplastic polymers are stabilized against ultra-violet radiation by incorporating therein as a stabilizer a stabilizing amount, e.g., 0.1 to 5% by weight of a tertiary phosphine oxide or sulfide of the general formula: ##EQU1## in which X is oxygen or sulfur and R.sub.1, R.sub.2 and R.sub.3 are each selected from hydroxyalkyl, haloalkyl, carbalkoxyalkyl, acyloxyalkyl, phenylhydroxyalkyl wherein the phenyl radical may be substituted by one or more halogens, and cyanoalkyl wherein the alkyl radical has 1 to 6 carbon atoms.
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      Mentions: Germany
    1849-1856 of 1856 « 1 2 ... 75 76 77 78
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