Claims
- 1. In a process for the production of cellular products which comprises incorporating a blowing agent into rubber or a synthetic polymer and then heating to activate the blowing agent, the improvement which comprises using as the blowing agent tetrazole compounds represented by the formulae (II), (III) and (V): ##STR5## wherein R.sub.2 is selected from the group consisting of H, --OH, --COOH, --SO.sub.3 H, --NO.sub.2, halogen and --NH.sub.4 R.sub.5 wherein R.sub.4 and R.sub.5 each are H or C.sub.1 to C.sub.4 alkyl, C.sub.1 to C.sub.6 alkyl, C.sub.3 to C.sub.6 cycloalkyl or C.sub.2 to C.sub.6 alkenyl, optionally substituted by C.sub.1 to C.sub.6 alkyl, --OH, --COOH, --SO.sub.3 H, --NO.sub.2, halogen, --NR.sub.4 R.sub.5 wherein R.sub.4 and R.sub.5 are as defined above or, R.sub.2 can be phenyl, benzyl or phenethyl radicals optionally substituted by 1 to 3 halogen, --OH, NO.sub.2, --NR.sub.4 R.sub.5, wherein R.sub.4 and R.sub.5 are as described above, C.sub.1 to C.sub.4 alkyl and esters or amides of lower carboxylic acids;
- R.sub.3 is selected from the group consisting of C.sub.5 to C.sub.6 alkylene, cycloalkylene or alkenylene, unsubstituted or substituted by C.sub.1 to C.sub.6 alkyl, --OH, --COOH, SO.sub.3 H, --NO.sub.2, halogen, NR.sub.4 R.sub.5 wherein R.sub.4 and R.sub.5 are as defined above, --O--, --S--, --SO.sub.2, --CO--, --phenylene or bisphenylene, said phenylene or bisphenylene being unsubstituted or substituted by 1 to 8 halogens, --OH, --NO.sub.2, esters or amides of lower carboxylic acids, NR.sub.4 R.sub.5, wherein NR.sub.4 and R.sub.5 are as defined above or C.sub.1 to C.sub.4 alkyl; and
- M is a divalent metal selected from Ca, Cu, Zn, Mn, Fe, Co, Ni and Ba.
- 2. The process of claim 1 which includes heating the polymer containing said tetrazole compounds to a temperature sufficient to decompose the tetrazole compounds.
- 3. The process of claim 1 which comprises directly adding the tetrazole compound as blowing agent to a synthetic thermoplastic polymer or its components for the production of cellular products.
- 4. The process of claim 1 which includes, after said incorporating and prior to heating, the step of forming the polymer with the tetrazole compound therein at a temperature less than the decomposition temperature of the tetrazole, into formable chips or pellets.
- 5. The process of claim 1 in which the blowing agent is employed in an amount of from about 0.01 to about 15 percent by weight of the rubber or synthetic polymer.
Priority Claims (2)
Number |
Date |
Country |
Kind |
1-324953 |
Nov 1990 |
JPX |
|
3-240402 |
Aug 1991 |
JPX |
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Parent Case Info
This is a divisional of Ser. No. 07/941,836, filed Sep. 8, 1992 which is a pending continuation-in-part of Ser. No. 07/798,561 filed Nov. 26, 1991.
US Referenced Citations (5)
Foreign Referenced Citations (3)
Number |
Date |
Country |
1197214 |
Jul 1970 |
GBX |
1542055 |
Mar 1979 |
GBX |
1569683 |
Jun 1980 |
GBX |
Divisions (1)
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Number |
Date |
Country |
Parent |
941836 |
Sep 1992 |
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Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
798561 |
Nov 1991 |
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