# US 5,352,723 A · Stabilized vinyl halide compositions containing hydrotalcites

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 5,352,723 A
- Document ID: US5352723A
- Status: Granted
- Kind: A
- Application number: 07/945,011
- Filed: 1992-09-15
- Granted: 1994-10-04
- Earliest claimed: 1992-09-15
- Assignees: Synthetic Products Company
- Inventors: David M. Tanno; Richard F. Grossman; Eric Farone
- Web page: https://patentgrep.com/patent/US5352723A

## CPC

- C08K 3/26: Carbonates; Bicarbonates
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)

## Abstract

Hydrotalcites are disclosed as stabilizers for vinyl halide resins where the BET has a specific surface area of at least about 40 m.sup.2 /g, preferably about 50 to 60 m.sup.2 /g.

## Claims

### Claim 1

A stabilized vinyl halide resin composition comprising a vinyl halide resin and as a heat stabilizer a hydrotalcite having a BET specific surface area greater than about 40 m.sup.2 /g, the hydrotalcite in an effective amount to provide heat stability to said vinyl halide resin.

### Claim 2 (depends on 1)

The composition of claim 1 wherein said hydrotalcite has a BET specific surface area of about 50 to about 60 m.sup.2 /g.

### Claim 3 (depends on 1)

The composition of claim 1 further containing a stabilizing metal salt of a higher fatty acid selected from the group consisting of calcium, zinc, barium and cadmium, and mixtures of said metal salts.

### Claim 4 (depends on 3)

The composition of claim 3 wherein said hydrotalcite is present in an amount from about 0.5 to about 5 parts, said metal salt stabilizers present in an amount of from about 0.5 to about 5 parts, said parts based upon 100 parts of said resin.

### Claim 5

A stabilized vinyl halide resin composition comprising a vinyl halide resin and as a heat stabilizer a hydrotalcite having a BET specific surface area of about 50 to about 60m.sup.2 g the hydrotalcite in an effective amount to provide heat stability to said vinyl halide resin, and a stabilizing metal salt of a metal selected from the group consisting of calcium, zinc, barium, cadmium, and antimony, and mixtures of said metal salts.

### Claim 6 (depends on 5)

The composition of claim 5 wherein said hydrotalcite is present in an amount from about 0.5 to about 5 parts, said metal salt stabilizers present in an amount of from about 0.5 to about 5 parts, said parts based upon 100 parts of said resin.

### Claim 7 (depends on 5)

The composition of claim 5 wherein said hydrotalcite has the approximate empirical formula of:
Mg.sub.0.7 Al.sub.0.3 (OH).sub.2 (X).sub.0.15 .times.H.sub.2 O
wherein X is a divalent anion selected from the group consisting of carbonate, sulfite, hydrogen phosphite or perchlorate.

### Claim 8 (depends on 5)

The composition of claim 5 wherein said hydrotalcite has the approximate empirical formula of:
Mg.sub.3 ZnAl.sub.2 (OH).sub.12 X.times.H.sub.2 O
wherein X is a divalent anion selected from the group consisting of carbonate, sulfite, hydrogen phosphite or perchlorate.