# US 4,393,158 A · Hydrolytically stable polycarbonate compositions

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- Number: US 4,393,158 A
- Document ID: US4393158A
- Status: Granted
- Kind: A
- Application number: 06/284,639
- Filed: 1981-07-20
- Granted: 1983-07-12
- Earliest claimed: 1981-07-20
- Assignees: General Electric Company
- Inventors: Kenneth F. Miller
- Web page: https://patentgrep.com/patent/US4393158A

## CPC

- C08K 5/5435: containing oxygen in a ring
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)

## Abstract

An improved hydrolytically stable aromatic polycarbonate composition comprising in admixture an aromatic polycarbonate resin and a stabilizing amount of at least one stabilizing compound selected from epoxy silanes and epoxy siloxanes.

## Claims

### Claim 1

An aromatic polycarbonate composition exhibiting improved hydrolytic stability comprising in admixture an endcapped aromatic polycarbonate resin and a hydrolytically stabilizing amount of at least one stabilizing compound of the formula
Z.sub.n Si(R.sup.3).sub.4-n
wherein
n is an integer from 1 to 3 inclusive;
R.sup.3 is independently selected from hydrogen, alkyl radicals; substituted alkyl radicals; alkenyl radicals; cycloalkyl radicals; aryl radicals; alkaryl radicals; aralkyl radicals; divalent organic radicals which together with the silicon atom form a cyclic structure, said organic radicals being selected from divalent saturated aliphatic hydrocarbon radicals and divalent saturated aliphatic organic radicals containing carbon and oxygen atoms in the ring structure; OR.sup.4 radicals wherein R.sup.4 is selected from hydrogen, alkyl radicals, substituted alkyl radicals, alkenyl radicals, aryl radicals, aralkyl radicals, alkaryl radicals, cycloalkyl radicals; --R.sup.5 OR.sup.4 radicals wherein R.sup.5 is a divalent saturated aliphatic hydrocarbon radical or a divalent aromatic hydrocarbon radical; --COOR.sup.4 radicals; --OOCR.sup.4 radicals; --R.sup.5 COOR.sup.4 radicals; --R.sup.5 OOCR.sup.4 radicals; and polyether radicals.
Z is of the formula ##STR12## wherein: (i) R.sup.18 through R.sup.27 are independently selected from the class consisting of hydrogen; alkyl radicals; substituted alkyl radicals; alkenyl radicals; aryl radicals; alkaryl radicals; aralkyl radicals; OR.sup.29 radicals wherein R.sup.29 is selected from the class consisting of hydrogen, alkyl radicals, substituted alkyl radicals, alkenyl radicals, aryl radicals, alkaryl radicals, and aralkyl radicals; --R.sup.30 OR.sup.29 radicals wherein R.sup.30 is a divalent saturated aliphatic hydrocarbon radical or a divalent aromatic hydrocarbon radical; --COOR.sup.29 radicals; --OOCR.sup.29 radicals; --R.sup.30 OOCR.sup.29 radicals; --R.sup.30 COOR.sup.29 radicals; OR.sup.31 radicals wherein R.sup.31 is selected from the class consisting of oxirane ring containing saturated aliphatic hydrocarbon radicals and oxirane ring containing aliphatic-aromatic hydrocarbon radicals; --R.sup.30 OOCR.sup.31 radicals; and --R.sup.30 COOR.sup.31 radicals; with the proviso that
(ii) one of R.sup.18 through R.sup.27 is selected from the class consisting of divalent saturated aliphatic hydrocarbon radicals; divalent aromatic hydrocarbon radicals; 13 OR.sup.32 -- radicals wherein R.sup.32 is selected from divalent saturated aliphatic hydrocarbon radicals and divalent aromatic hydrocarbon radicals; --R.sup.30 OR.sup.32 -- radicals; --OOCR.sup.32 -- radicals; --COOR.sup.32 -- radicals; --R.sup.30 OOCR.sup.32 -- radicals; and --R.sup.30 COOR.sup.32 -- radicals.

### Claim 2 (depends on 1)

The composition of claim 1 wherein said stabilizing amount is from about 0.005 to about 4 weight percent based on the weight of the aromatic polycarbonate resin.

### Claim 3 (depends on 2)

The composition of claim 2 wherein:
(i) R.sup.18 through R.sup.27 are independently selected from the class consisting of hydrogen; alkyl radicals; substituted alkyl radicals; cycloalkyl radicals; aryl radicals; alkaryl radicals; aralkyl radicals; and OR.sup.28 radicals wherein R.sup.28 is selected from hydrogen, alkyl radicals, substituted alkyl radicals, aryl radicals, alkaryl radicals, and aralkyl radicals; with the proviso that
(ii) one of R.sup.18 through R.sup.27 is selected from the class consisting of divalent saturated aliphatic hydrocarbon radicals; divalent aromatic hydrocarbon radicals; --OR.sup.32 -- radicals; and --R.sup.30 OR.sup.32 -- radicals.

### Claim 4 (depends on 3)

The composition of claim 3 wherein R.sup.3 is selected from hydrogen, hydroxyl, alkyl radicals, alkoxy radicals, aryl radicals, aryloxy radicals, alkaryl radical, and aralkyl radicals.

### Claim 5 (depends on 4)

The composition of claim 4 wherein said aromatic polycarbonate is derived from a dihydric phenol and a carbonate precursor.

### Claim 6 (depends on 5)

The composition of claim 5 wherein said carbonate precursor is phosgene.

### Claim 7 (depends on 6)

The composition of claim 6 wherein said dihydric phenol is bisphenol A.

### Claim 8 (depends on 4)

The composition of claim 4 which further includes an organophosphite color stabilizer.

### Claim 9 (depends on 8)

The composition of claim 8 wherein said aromatic polycarbonate is derived from a dihydric phenol and a carbonate precursor.

### Claim 10 (depends on 9)

The composition of claim 9 wherein said carbonate precursor is phosgene.

### Claim 11

The composition of clam 10 wherein said dihydric phenol is bisphenol A.

### Claim 12 (depends on 4)

The composition of claim 4 wherein R.sup.3 is CH.sub.3 O--; n is 1; R.sup.18 -R.sup.21 and R.sup.23 -R.sup.27 are hydrogen; and R.sup.22 is --CH.sub.2 CH.sub.2 --.