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| What is claimed is: 1. A low-cost solar heating and cooling system having a fluid supply manifold ... |
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| Flat plate solar heat collector |
| The present invention is a solar heat collector which fulfills the objects and overcomes the ... |
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| Wind loss prevention for open cavity solar receivers |
| Referring now to FIG. 1, an open cavity receiver 10 which operates at or close to ambient pressure ... |
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| Hydrotherapy installation |
| What is claimed is: 1. A hydrotherapy installation for pools comprising in combination: a rotary ... |
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| Three port two-way diverter valve with integral drain on one output port |
| What is claimed is: 1. A valve comprising: a valve body having a cavity with first, second, third ... |
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| Process for casting metals in which magnetic fields are employed |
| I claim: 1. In a method for continuously and semi-continuously casting metals where the molten ... |
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| Solar energy collector |
| OF THE INVENTION In FIG. 1, a solar panel 20 consisting of a central chamber 21, and a conduit or ... |
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| Catalytic heater or warmer |
| OF THE INVENTION There is shown at 10 the complete, assembled catalytic heater or warmer of this ... |
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| Solar collector panel |
| I claim: 1. A solar collector panel comprising, in a one-piece molded relationship, a base having a ... |
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| Method for lubricating and conditioning monofilament fishing lines |
| I claim: 1. The new use of a synthetic yarn and fiber processing agent selected from the group ... |
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Process for producing polyurethane
| Details |
Inventors: Hirai, Koji; Taniguchi, Shunro; Ishiguro, Michihiro; Murata, Yoshifumi; Yokota, Shinichi; Ishii, Masao; Yoshimura, Noriaki; Okamura, Takayuki;
Assignee: Kuraray Co., Ltd. (Kurashiki, JP)
Primary Examiner: Kight, III; John
Assistant Examiner: Sergent; Rabon
Attorney, Agent or Firm: Oblon, Spivak, McClelland, Maier & Neustadt
In the preparation of a polyurethane from a polymeric polyol and an organic polyisocyanate, by using as the polyol a polymeric polyol containing in the molecule thereof 2-methyl-1,8-octanediol residue, a novel polyurethane having excellent resistance to hydrolysis, low temperature characteristics and abrasion resistance can be obtained. |
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DETAILED DESCRIPTION What is claimed is: 1.
In a method for producing a polyurethane by the reaction consisting essentially of a polymeric polyol with a polyisocyanate, the improvement comprising, using as said polyol a polymeric polyol having in the molecule thereof a group represented by the formula I: ##STR8## 2.
A method as defined in claim 1, wherein said polymeric polyol having a group represented by the formula [I] is a polyester polyol having an average molecular weight of 500 to 30,000 obtained by reacting 2-methyl-1,8-octanediol or a mixed glycol containing said diol as a main component, with a dicarboxylic acid, or is a polycarbonate polyol having an average molecular weight of 500 to 30,000 obtained by reacting 2-methyl-1,8-octanediol or a mixed glycol containing said diol as a main component, with a dicarbonate.
3.
A method as defined in claim 2, wherein said mixed glycol consists of 2-methyl-1, 8-octanediol and an alkanediol represented by the formula: HO(CH.
sub.
2).
sub.
n OH wherein n is an integer of 6 to 9.
4.
A method as defined in claim 2, wherein said polymeric polyol is said polyester polyol.
5.
A method as defined in claim 2, wherein said polymeric polyol is said polycarbonate polyol.
6.
A polyurethane obtained by the reaction consisting essentially of a polyisocyanate with a polymeric polyol having in the molecule thereof a group represented by the formula I: ##STR9## 7.
A polyurethane as defined in claim 6, wherein said polymeric polyol having a group represented by the formula I is a polyester polyol having an average molecular weight of 500 to 30,000 obtained by reacting 2-methyl-1,8-octanediol or a mixed glycol containing said diol as a main component, with a dicarboxylic acid, or is a polycarbonate polyol having an average molecular weight of 500 to 30,000 obtained by reacting 2-methyl-1,8-octanediol or a mixed glycol containing said diol as a main component, with a dicarbonate.
8.
A polyurethane as defined in claim 7, wherein said mixed glycol consists of 2-methyl-1,8-octanediol and an alkanediol represented by the formula: HO(CH
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