 Apparatus for producing methane gas by processing waste materials |
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| Compositions and process for dedusting solids-containing hydrocarbon oils |
| Having described the invention, what is claimed is: 1. As a composition of matter, an admixture of ... |
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| High purity silicon production by arc heater reduction of silicon intermediates |
| It has been found in accordance with this invention that the foregoing process may be overcome by a ... |
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| Process for doping high purity silicon in an arc heater |
| It has been found in accordance with this invention that the foregoing disadvantage can be overcome ... |
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| Arc heater production of silicon involving a hydrogen reduction |
| The process of this invention is characterized by the following steps: (1) HALOGENATION OF A SILICA-... |
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| Vapor deposition coating machine |
| Referring now in detail to the drawings (FIG. 1), A designates a machine for depositing a thin ... |
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| Process of making permanent magnets |
| OF THE INVENTION The present invention contemplates permanent magnet material and permanent ... |
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| Toilet for cats and other small animals |
| We claim: 1. A toilet for cats and other small animals comprising: (a) reusable litter box having ... |
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| Electrolysis apparatus |
| What is claimed is: 1. In electrolysis apparatus for the manufacture of chlorine from an aqueous ... |
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| Electrodialysis of pickle liquor |
| I claim: 1. In an electrodialytic process for converting a soluble metal sulfate into an insoluble ... |
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One-part moisture-curable polyurethane adhesive, coating, and sealant compositions
| Details |
Inventors: Schumacher, Gerald F.;
Assignee: Minnesota Mining and Manufacturing Company (St. Paul, MN)
Primary Examiner: Hoke; Veronica P.
Assistant Examiner:
Attorney, Agent or Firm: Sell; D. M., Smith; J. A., Cleveland; D. R.
Adhesive, coating, or sealant compositions containing prepolymer(s) derived from MDI (or derivative(s) thereof) and polyol(s) containing primary hydroxyl groups, together with bis[2-N,N-dialkylamino)alkyl]ether(s). |
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DETAILED DESCRIPTION The prepolymer (a) is derived from certain precursors, such precursors being 4,4'-diphenylmethane diisocyanate or isocyanate-functional derivative(s) thereof and one or more polyols containing primary hydroxyl groups (sometimes referred to hereafter as "primary polyols").
As used herein, a prepolymer "derived from" the above-named precursors will include prepolymers actually prepared by reacting together such precursors, and will also be construed to include prepolymers which have not actually been prepared by reacting together such precursors but which have chemical structures capable of being prepared from such precursors if desired.
A preferred class of prepolymers for use in this invention have the formula: ##STR1## where m is 2 or more, n is greater than or equal to zero, and B is a polyvalent backbone.
Preferably, m is about 2 to 4.
Also, n preferably is zero or about 1 and most preferably is zero.
B preferably is a polyvalent aliphatic, olefinic, ether, ester, thioether, urethane, or urea radical.
Most preferably, B is a polyvalent polyether radical.
A preferred subclass of prepolymers of Formula I, above, have the formula: ##STR2## where B' is a divalent polyether radical.
The preferred method for preparing prepolymers for use in this invention involves the reaction of 4,4'-diphenylmethane diisocyanate or isocyanate-functional derivative(s) thereof and one or more primary polyols.
Other methods can be used if desired, but generally are less convenient or more expensive than the preferred method.
4,4'-Diphenylmethane diisocyanate is commonly known as "methylene diisocyanate" or "MDI".
In its pure form, MDI is commercially available as "Isonate 125M" from the Upjohn Co.
, and as "Mondur M" or "Multrathane M" from Mobay Chemical Corp.
As used herein, "isocyanate-functional derivatives of MDI" will be construed to include isocyanates actually prepared from MDI, and will also include isocyanates which have not actually been prepared from MDI but which have chemical structures capable of being prepared from MDI if desired
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Semiconductor manufacture 
