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Blowing agent compositions
| Details |
Inventors: Rowland, Donald G.; Heck, III, Rhomie L.;
Assignee: Uniroyal, Inc. (New York, NY)
Primary Examiner: Foelak; Morton
Assistant Examiner:
Attorney, Agent or Firm: Maslow; Andrew D.
A blowing agent composition is provided comprising an azodicarbonamid; zinc oxide, zinc carbonate or a zinc salt of C.sub.1 -C.sub.4 organic acid; and an aromatic sulfinic acid or a metal salt of an aromatic sulfinic acid. For each hundred parts by weight of the azodicarbonamid, the zinc oxide, zinc carbonate or zinc salt is 0.24-25 parts by weight and the aromatic sulfinic acid or metal salt is from 1-2000 parts by weight for each 100 parts of the zinc oxide, zinc carbonate or zinc salt. The total weight of the zinc oxide, zinc carbonate or zinc salt plus the aromatic sulfinic acid or metal salt is from 20-25 parts by weight. |
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DETAILED DESCRIPTION We claim: 1.
A process for expanding a gas expandable synthetic polymeric material comprising pre-mixing the blowing agent composition consisting essentially of: (a) azodicarbonamide; (b) zinc oxide, zinc carbonate or a zinc salt of C.
sub.
1 -C.
sub.
4 organic acid; and (c) an aromatic sulfinic acid or a metal salt of an aromatic sulfonic acid, wherein for each 100 parts by weight of (a), (b) is 0.
25-25 parts by weight and (c) is from 1-2000 parts by weight per 100 parts of (b) and the total of (b)+(c) is friom 2-25 parts by weight, incorporating 4-40 phr of said blowing agent with said gas expandable synthetic polymeric material and exposing said mixture to expanding conditions.
2.
A process for expanding gas expandable synthetic resin or rubber comprising pre-mixing the blowing agent composition of claim 1; incorporating 0.
5-30 parts per hundred parts of synthetic resin or rubber with the blowing agent composition of claim 1 and exposing said mixture to expanding conditions.
Description:
The present invention relates to improved blowing agent compositions, and their preparation and use.
When making an expanded material such as a foamed, synthetic polymeric material, the polymeric material has conventionally been mixed with a blowing agent, such as azodicarbonamide.
The performance requirements of blowing agents have now become more and more critical and changes in the composition of the blowing agents can have significant effects on the end product.
Various azodicarbonamide blowing agents are known in the prior art for blowing gas-expandable polymeric material.
U.
S.
Pat.
No.
3,903,015 discloses a combination of azodicarbonamide and a sulfinic acid or salt.
U.
S.
Pat.
No.
4,312,776 discloses a blowing agent composition comprising a combination of azodicarbonamide, a chromium sulfate and a zinc compound.
Similarly, British Pat.
No.
1,581,252 discloses an olefin polymer, a cross-linking agent having a decomposition temperature below that of azodicarbonamide and a chromium compound
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