 Making silicon carbide bodies |
| I claim: 1. A method of making a reaction-bonded silicon carbide body by steps which include ... |
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| Method of producing permeable, porous molded bodies of silicon carbide |
| We claim: 1. Method of producing permeable porous molded bodies of silicon carbide, comprising the ... |
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| Process for producing silicon carbide heating elements |
| However, it has now been found that the influence obtained by nitrogen addition can be further ... |
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| Single phase silicon carbide refractory |
| OT THE INVENTION The present invention provides a method of pressureless sintering silicon carbide ... |
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| Method of making a water filter |
| In the present invention, a satisfactory degree of filtration without undue inhibition of water ... |
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| Clarification tank |
| We claim: 1. An apparatus for clarifying a liquid mixture, comprising: a. a tank having means for ... |
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| Phenolic polymer prepared from o-cresol |
| What is claimed is: 1. An alkylol group containing phenolic polymer of Formula I: ##STR11## wherein:... |
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| Apparatus for increasing the pH of waste water |
| I claim: 1. Apparatus for increasing the pH of waste water, comprising a lime water having an ... |
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| Method for preparing improved expanded polystyrene sheet |
| I claim: 1. In a process for producing microcellular expanded styrene polymer sheet by extruding a ... |
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| Chemical-resistant wholly aromatic polyamide fiber material |
| OF THE INVENTION In the chemical-resistant wholly aromatic polyamide fiber material of the present ... |
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Elastomeric composition
| Details |
Inventors: Wyman, Ransome J.;
Assignee:
Primary Examiner: Jacobs; Lewis T.
Assistant Examiner:
Attorney, Agent or Firm: Nilsson, Robbins, Dalgarn, Berliner, Carson & Wurst
A method and composition are provided for preparing elastomeric polymers containing a particulate rubber filler which are useful to provide relatively thick membranes for flooring, decking, roofing or other purposes and which permit the molding of a wide variety of rubber-like goods. The composition comprises a polyol, an organic polyisocyanate, an alkaline carbon dioxide absorbent and a water carrier in amounts sufficient to form a non-foaming pourable, trowelable or sprayable composition, includes rubber particles to provide increased resiliency, economy and density, and cures internally to provide a polyurethane elastomer coating. A prepolymer may be prepared as a separate component having an extended shelf life and adapted for ultimate combination with an aqueous rubber slurry in order to facilitate simple on site mixing of the composition. |
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DETAILED DESCRIPTION While the invention will be exemplified by reference to a specific polyurethane elastomeric polymer, the invention in general and certain aspects in particular are broad in scope, for example, the concepts of curing a particulate rubber containing polyurethane elastomer with an excess of water and including an alkaline component to absorb the carbon dioxide produced thereby, and providing a method whereby a prepolymer component and a water-particulate rubber slurry may be easily mixed to form a superior coating membrane.
Consequently, specific details disclosed herein are merely representative and are deemed to afford the best embodiments at this time known to provide a basis for the claims which define the scope of the present invention.
The polyol can be chosen from a variety of OH terminated polyethers.
Preferred are the polyoxyalkylene polyols having two-four hydroxyl groups and where the alkylene group has 2-6 carbon atoms.
A large variety are available, obtained by polymerization of an aklylene oxide, such as ethylene oxide, probylene oxide or butylene oxide with a glycol.
Polyethers having higher functionality may be obtained by reaction with a diol, triol or higher polyol, such as glycerine, trimethylol propane, and pentaerythritol.
Polyols of the above types are available commercially, for example: Voranols (Trademark), Dow Chemical Company: Poly-G (Trademark) from Olin Chemicals Division; and Pluracols (Trademark) from BASF Wyandotte Corporation.
In particular, a predominantly polypropylene-oxide triol having a molecular weight of at least 1,000 is most suitable.
Polyols may be used up to a molecular weight which produces a viscosity in excess of that required for the desired application.
Polyols having a molecular weight of less than about 500 begin to lose some elastomeric properties and those having a molecular weight of less than about 200 become rigid and produce large amounts of carbon dioxide.
Polyols having a high ethylene oxide content on the backbone show increased reactivity, i
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Liquid Purification 
