# US 5,710,188 A · PVC foam compositions

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- Number: US 5,710,188 A
- Document ID: US5710188A
- Status: Granted
- Kind: A
- Application number: 08/820,192
- Filed: 1997-03-19
- Granted: 1998-01-20
- Earliest claimed: 1997-03-19
- Assignees: Morton International, Inc.
- Inventors: George F. Beekman; Lionel R. Price
- Web page: https://patentgrep.com/patent/US5710188A

## CPC

- C08J 9/0061: {characterized by the use of several polymeric components}
- C08J 9/0033: {containing sulfur}
- C08J 9/0052: {Organo-metallic compounds}
- C08J 9/10: developing nitrogen {, the blowing agent being a compound containing a nitrogen-to-nitrogen bond}
- C08J 2205/10: Rigid foams
- C08J 2327/06: Homopolymers or copolymers of vinyl chloride
- C08J 2433/00: Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers
- C08J: WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H (working, e.g. shaping, of plastics B29)

## Abstract

The density of rigid foamed articles made by the thermal decomposition of a blowing agent in a vinyl chloride polymer is reduced by the use of an organotin halide in combination with a mercaptocarboxylic acid ester or a sulfide of such ester or a mixture of the ester and the sulfide to activate the blowing agent.

## Claims

### Claim 1

A method for foaming a vinyl chloride polymer comprising heating a mixture comprising the polymer, a blowing agent, an an organotin halide having the formula:
R.sub.(4-x) SnX.sub.x I
wherein R is an alkyl radical having from 1 to 18 carbon atoms, and X is halogen of atomic weight 35 to 127, and x is from 1 to 3; and
at least one stabilizer selected from the group consisting of:
(A) an organotin mercaptide of a mercaptocarboxylic acid ester having the formula:
R.sup.1.sub.(4-y) Sn›SZ(COOR.sup.2).sub.m !.sub.y II
wherein R.sup.1 is an alkyl or cycloalkyl group having from 1 to 30 carbon atoms, Z is a alkylene radical group derived from an alcohol having from 1 to 4 hydroxyl groups and from 1 to 30 carbon atoms, m is an integer from 1 to 4, and y is any number from 1 to 3; with the proviso that when y is less than 3, the R.sup.1 groups may be the same or different, and when m is more than 1, the R.sup.2 groups may be the same or different, and
(B) a sulfide of an organotin mercaptide of Formula II.

### Claim 2 (depends on 1)

The method of claim 1 wherein Z is an alkylene radical.

### Claim 3 (depends on 1)

The method of claim 1 wherein mercaptides in which y is about 2 constitute from about 80 to about 85% of the total weight of the mercaptides.

### Claim 4 (depends on 1)

The method of claim 1 wherein R is an alkyl group having from 1 to 8 carbon atoms.

### Claim 5 (depends on 1)

The method of claim 1 wherein the sulfide has the formula: ##STR3## wherein R.sup.4 is a hydrocarbyl radical; R.sup.5 is a hydrocarbyl radical or --S--Z.sup.1 --›C(.dbd.O)OR.sup.6 !.sub.n ; Z.sup.1 is a alkylene radical having from 1 to 30 carbon atoms; R.sup.6 is hydrogen, a hydrocarbyl radical, a hydroxyhydrocarbyl radical, or R.sup.7 --OC(.dbd.O)R.sup.8, wherein R.sup.7 is (CH.sub.2).sub.k, phenylene, or --CH.dbd.CH--, and R.sup.8 is a hydrocarbyl radical; n is an integer from 1 to 3, p is from 1 to 2, q is from 1 to 10, k is 0 or an integer from 1 to 8, and the valency of Z.sup.1 is n+1; with the proviso that it includes products arising from an equilibrium among the --SnR.sup.4, --SnR.sup.5, and --Sn--S--Z.sup.1 --›C(.dbd.O)OR.sup.6 !.sub.n moieties.

### Claim 6 (depends on 1)

The method of claim 1 wherein R.sup.2 is an organic group derived from a monohydric alcohol having from 8 to 20 carbon atoms.

### Claim 7 (depends on 2)

The method of claim 2 wherein R.sup.2 is an organic group derived from a monohydric alcohol having from 8 to 20 carbon atoms.

### Claim 8 (depends on 5)

The method of claim 5 wherein R.sup.2 is an organic group derived from a monohydric alcohol having from 8 to 20 carbon atoms.