 Flat plate solar heat collector |
| The present invention is a solar heat collector which fulfills the objects and overcomes the ... |
|
| 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 ... |
|
| Hydrotherapy installation |
| What is claimed is: 1. A hydrotherapy installation for pools comprising in combination: a rotary ... |
|
| 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 ... |
|
| 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 ... |
|
| Solar energy collector |
| OF THE INVENTION In FIG. 1, a solar panel 20 consisting of a central chamber 21, and a conduit or ... |
|
| Catalytic heater or warmer |
| OF THE INVENTION There is shown at 10 the complete, assembled catalytic heater or warmer of this ... |
|
| Solar collector panel |
| I claim: 1. A solar collector panel comprising, in a one-piece molded relationship, a base having a ... |
|
| 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 ... |
|
| Styrene-butadiene-acrylonitrile interpolymer latex based cement additives |
| What is claimed is: 1. A cement additive consisting of (1) an interpolymer latex, said interpolymer ... |
|
|
Novel ester-modified poly(alkylene carbonate) polyahls
| Details |
Inventors: Harris, Robert F.;
Assignee: The Dow Chemical Company (Midland, MI)
Primary Examiner: McCamish; Marion C.
Assistant Examiner: Sridharan; Anang
Attorney, Agent or Firm:
Ester-modified poly(alkylene carbonate) polyahls comprising the residues of at least one polyahl, polyalkyleneoxy moieties, poly(alkylene carbonate) moieties, the residues of at least one ester of a carboxylic acid, and a plurality of active hydrogen end group are disclosed. The ester-modified poly(alkylene carbonate) polyahl has a number average molecular weight higher than the number average molecular weight of any known poly(alkylene carbonate) polyahl comprising the same monomeric components. Also disclosed are isocyanate-functional prepolymers of these ester-modified poly(alkylene carbonate) polyahls formed by reactions of the ester-modified poly(alkylene carbonate) polyahls of this invention with excess organic polyisocyanates. Urethane/urea polymers formed by the reactions of the isocyanate-functional prepolymers with polyahls are also disclosed. Also disclosed are urethane/urea polymers comprising the residue of at least one ester-modified poly(alkylene carbonate) polyahl of this invention, the residue of a polyisocyanate and the residue of at least one other polyahl selected from the group consisting of polyamines, polymercaptans and polyfunctional hydroxyl compounds. The novel compositions of this invention are useful in urethane/urea polymer applications such as foams, elastomers, plastics, adhesives, coatings and the like. |
|
DETAILED DESCRIPTION OF THE INVENTION The ester-modified poly(alkylene carbonate) polyahl compositions of this invention can be prepared by the reactions of poly(alkylene carbonate) polyahls with one or more modifiers.
During these reactions the modifier is chemically combined to the poly(alkylene carbonate) polyahl.
Poly(alkylene carbonate) polyahls are randomized polymers having a plurality of carbonate moieties and a plurality of active hydrogen moieties and optionally other moieties such as di- and higher polyalkyleneoxy, units.
An alkylene carbonate moiety is a repeating unit which has an alkylene group bound to a carbonate moiety.
An active hydrogen moiety is a moiety containing a hydrogen atom which because of its position in the moiety displays significant activity according to the Zerewitnoff test described by Kohler et al.
in the Journal of American Chemical Society, 49, 3181 (1927).
Illustrative of such active hydrogen moieties are --COOH, --OH, --NH.
sub.
2, --NH--, --CONH.
sub.
2, --SH and --CONH--.
Alkyleneoxy moiety refers herein to a repeating unit which has an alkylene group bound to oxygen.
Alkylene carbonate and alkyleneoxy moieties are respectively represented by the following formulae: ##STR1## wherein R.
sup.
2 is as hereinafter defined.
Preferred poly(alkylene carbonate) polyahls are random polymers which correspond to the formula ##STR2## wherein R.
sup.
1 is separately in each occurrence an n-valent hydrocarbon radical or hydrocarbon radical which can contain one or more heteroatoms of O, N or S; R.
sup.
2 is separately in each occurrence hydrogen, halogen, a nitro group, a cyano group, a C.
sub.
1-20 hydrocarbyl group or a C.
sub.
1-20 hydrocarbyl group substituted with one or more halo, cyano, nitro, thioalkyl, tert-amino, alkoxy, aryloxy, aralkoxy, carbonyldioxyalkyl, carbonyldioxyaryl, carbonyldioxyaralkyl, dioxyaralkyl, alkoxycarbonyl, aryloxycarbonyl, aralkoxycarbonyl, alkylcarbonyl, arylcarbonyl, aralkylcarbonyl, alkylsulfinyl, arylsulfinyl, aralkylsulfinyl, alkylsulfonyl, arylsulfonyl, or aralkylsulfonyl group; X is separately in each occurrence S, O, NH, ##STR3## A is separately in each occurrence ##STR4## combinations thereof or a covalent bond; Q is separately in each occurrence O, S or NH provided that all carbonate moieties are internal because terminal carbonate moieties are unstable and form OH moieties by the elimination of CO
|
| Related patents |
|
|
Polyester urethane fiber: polyester made from methyl pentane diol
OF THE PREFERRED EMBODIMENTS The elastic polyurethane fiber of the present invention is characterized by the high polymer diol residue, that is, the soft segment, ...
|
|
|
Solar heat energy collecting systems and methods of making the same
It has been found that such principal purposes and objects, as well as other principal purposes and objects which will become clear from a further reading and ...
|
|
|
Heat pump output indicator
What is claimed is: 1. A device for measuring the operating efficiency relative to its design efficiency at a given outdoor temperature, said heat pump or refrigeration ...
|
|
|
Method primarily for performance control at heat pumps or refrigerating installations and arrangement for carrying out the method
I claim: 1. A method of primarily testing and performance control of heat pumps, refrigerating installations or corresponding systems, in which system thermal energy ...
|
|
|
Deep fat fryer
Methods and apparatus are herein disclosed for substantially isothermal heating of a vat containing cooking liquid, such as deep fat frying oil. The apparatus uses a ...
|
|
|
Solar panel
It is therefore an object of this invention to provide an economical process for heating a swimming pool. It is another object of this invention to provide a solar panel ...
|
|
|
Apparatus for collecting and transmitting solar energy
It is an object of the present invention to provide an apparatus for collecting a beam of sunlight which includes desired light components in a relatively great amount ...
|
|
|
Swimming pool water heating system
Having herein described the invention, what is claimed as new is: 1. A pool water heating device for heating the water in a pool from solar heat from the Sun, and ...
|
|
|
Portable light-weight solar heater
We claim: 1. A flat plate solar energy collector assembly adapted to float on the water surface of a pool, comprising a relatively thin flexible cellular plastic sheet ...
|
|
|
Solar heater
What is claimed is: 1. A low-cost solar heating and cooling system having a fluid supply manifold and return manifold comprising a plurality of solar collector modular ...
|
|
|
Heat Accumulators 
