 Portable light-weight solar heater |
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| Solar heater |
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| Flat plate solar heat collector |
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| Wind loss prevention for open cavity solar receivers |
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| Hydrotherapy installation |
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| Three port two-way diverter valve with integral drain on one output port |
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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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Preparation of polyesters and poly(ester-carbonates) by acidolysis of aromatic polycarbonates
| Details |
Inventors: Jackson, Jr., Winston J.; Darnell, William R.;
Assignee: Eastman Kodak Company (Rochester, NY)
Primary Examiner: Cockeram; H. S.
Assistant Examiner:
Attorney, Agent or Firm: Heath, Jr.; William P., Reece, III; Daniel B.
Process for the preparation of polyesters and poly(estercarbonates) comprising heating, preferably with a suitable catalyst, aromatic diol polycarbonates and esters of cycloaliphatic or aromatic dicarboxylic acids. The polymers may contain 5-100 mole percent dicarboxylate moiety, based on total acids. The products have utility as molding plastics, fibers, films, adhesives, coatings, extruded shapes, etc. The hydroxy-terminated prepolymer obtained in the first step may be reacted with a diisocyanate to form a polyurethane. |
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DETAILED DESCRIPTION We claim: 1.
Process for the preparation of polyesters and poly(ester-carbonates) comprising preparing a reaction mixture of an aromatic or cycloaliphatic dicarboxylic acid and an aromatic polycarbonate in a molar ratio (r) of dicarboxylic acid/polycarbonate of about 0.
05 to about 0.
5, heating the mixture to at least 250.
degree.
C.
for a period of time sufficient to form a hydroxy-terminated prepolymer, and then reducing pressure and distilling out aromatic diol to yield polymer having an inherent viscosity of at least 0.
35.
2.
Process of claim 1 wherein the reaction mixture contains a catalytic amount of catalyst compounds such as tetraisopropyl titanate, dibutyltin oxide, dibutyltin diacetate, lead oxide, zinc acetate, antimony acetate, and germanium oxide.
3.
Process of claim 2 wherein the catalyst is a titanium compound.
4.
Process of claim 1 wherein said molar ratio (r) is less than 0.
50.
5.
Process of claim 1 wherein said molar ratio (r) is 0.
50.
6.
Process of claim 1 wherein said aromatic polycarbonate is bisphenol A polycarbonate.
7.
Process of claim 1 wherein said polymer has an I.
V.
of .
gtoreq.
0.
50.
8.
Process of claim 1 wherein said polymer has an I.
V.
of .
gtoreq.
1.
0.
9.
Shaped article of the polymer produced by the process of claim 1.
Description:
FIELD OF THE INVENTION This invention is a process for the preparation of polyesters and poly(ester-carbonates).
Polyesters and poly(ester-carbonates) may be prepared by heating, preferably in the presence of a suitable catalyst, the desired molar ratio (r) of an aromatic or cycloaliphatic dicarboxylic acid and an aromatic polycarbonate at >250.
degree.
C.
to form a hydroxyterminated prepolymer.
This prepolymer can be further polymerized at >300.
degree.
C.
(preferably .
about.
340.
degree.
C.
) to a high molecular weight polymer.
As stated earlier, polyesters and poly(ester-carbonates) may be prepared by this process.
The factor which determines which of these types of polymers is obtained is the starting molar ratio (r) of dicarboxylic acid/aromatic polycarbonate employed in the process
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