Blends of organic polymers and organic terminated polysulfide polymers

• US 4,607,078 A
• Filed: 12/13/1984
• Issued: 08/19/1986
• Est. Priority Date: 11/16/1983
• Status: Expired due to Term

• Current Assignee: The Dow Chemical Company (Dow, Inc.)
• Original Assignee: The Dow Chemical Company (Dow, Inc.)
• Inventors: Dergazarian, Thomas E.
• Primary Examiner(s): Lieberman, Allan M.
• Application Number:
  US06/681,356
• Time in Patent Office: 614 Days
• Field of Search: 525/189, 525/64, 525/92, 525/93, 525/523, 525/404, 525/535, 525/537, 525/403, 528/388, 524/500
• US Class Current: 525/64
• CPC Class Codes: C08G 75/14 Polysulfides
• CPC Class Codes: C08L 2666/02 Organic macromolecular compounds, natural resins, waxes or and bituminous materials
• CPC Class Codes: C08L 81/04 Polysulfides

Abstract

Blends of organic-terminated polysulfide elastomers and organic polymers are disclosed. The organic polymer may be a saturated organic elastomer, an ethylenically unsaturated organic elastomer, a non-elastomeric polymer, or any combination blend of the three. Said blends exhibit unexpectedly good tensile properties and resilience and are useful for forming gaskets, membranes, sealants, adhesives, hoses, tubing and similar articles.

Claims

1. A polymer blend comprising a blend of a curable or noncurable organic-terminated polysulfide polymer and an organic polymer which is not an organic-terminated polysulfide, wherein said polysulfide polymer is as represented by the general structure ##STR3## wherein n is a number from about 2 to about 8, l is zero or a positive integer, m is a positive integer, each R is independently an unsubstituted or inertly substituted organic polyradical with the radicals residing in carbon atoms, p is an integer which is the difference between the number of radicals on R and 2, and each Z is independently chosen from the class consisting of (vinylaryl)alkyl and other inertly substituted noncrosslinking monoradicals, and wherein said polysulfide polymer comprises from about 1 to about 99 percent by weight of the combined weight of the polysulfide polymer and the organic polymer and wherein the proportions of the polysulfide elastomer and the organic polymer are such that the blend is compatible as evidenced by a lack of phase separation in the blend.

2. The blend of claim 1 wherein said polysulfide polymer is a curable elastomer wherein a sufficient portion of the terminal groups of said copolymer are (vinylaryl)alkyl so that said polymer is curable.

3. The blend of claim 1 wherein said polysulfide polymer is a noncurable elastomer wherein the proportion of terminal groups which are (vinylaryl)alkyl is less than that amount which enables the polymer to significantly cure.

4. The blend of claim 2 wherein said organic polymer is an ethylenically unsaturated organic elastomer which contains at least about one carbon carbon double bond per 50 repeating units of said organic polymer.

5. The blend of claim 4 wherein said unsaturated organic elastomer is a homopolymer or copolymer of a conjugated diene.

6. The blend of claim 5 wherein said conjugated diene is butadiene, isoprene, or halogenated butyl rubbers.

7. The blend of claim 4 wherein the unsaturated organic elastomer is a block or graft copolymer of a conjugated diene.

8. The blend of claim 7 wherein the block or graft copolymer is a block or graft copolymer of styrene and butadiene or isoprene.

9. The blend of claim 4 wherein the unsaturated organic elastomer is a polymer of a bicyclic diene with ethylene and/or propylene.

10. The blend of claim 4 wherein the unsaturated organic elastomer is a polypenteneamer.

11. The blend of claim 3 wherein said organic polymer is an ethylenically unsaturated organic elastomer which contains at least about one carbon carbon double bond per 50 repeating units of said organic polymer.

12. The blend of claim 11 wherein said unsaturated organic elastomer is a homopolymer or interpolymer of a conjugated diene.

13. The blend of claim 12 wherein said conjugated diene is butadiene, isoprene, or halogenated butyl rubbers.

14. The blend of claim 11 wherein the unsaturated organic elastomer is a block or graft copolymer of a conjugated diene.

15. The blend of claim 14 wherein the block or grafted copolymer is a block or graft copolymer of styrene and butadiene or isoprene.

16. The blend of claim 11 wherein the unsaturated organic elastomer is a polymer of a bicyclic diene and ethylene and/or propylene.

17. The blend of claim 11 wherein the unsaturated organic elastomer is a polypenteneamer.

18. The blend of claim 2 wherein said organic polymer is a saturated organic elastomer.

19. The blend of claim 18 wherein said saturated organic elastomer is a saturated chain of a polymethylene.

20. The blend of claim 19 wherein said saturated polymethylene chain is a polymer of chlorinated polyethylene or polyisobutylene.

21. The blend of claim 3 wherein said organic polymer is a saturated organic elastomer.

22. The blend of claim 21 wherein said saturated organic elastomer is a saturated chain of a polymethylene.

23. The blend of claim 22 wherein said saturated polymethylene chain is a polymer of chlorinated polyethylene or polyisobutylene.

24. The blend of claim 2 wherein said organic polymer is a mixture of unsaturated and saturated organic elastomers.

25. The blend of claim 3 wherein said organic polymer is a mixture of unsaturated and saturated organic elastomers.

26. The blend of claim 2 wherein said organic polymer is a non-elastomeric polymer.

27. The blend of claim 26 wherein said non-elastomeric polymer is polystyrene, low density polyethylene, high density polyethylene, linear low density polyethylene, or polychloromethyl oxirane.

28. The blend of claim 26 wherein said non-elastomeric polymer is a copolymer of:

an alkyl acrylate and acrylonitrile;

ethylene and vinyl acetate;

ethylene and propylene;

ethylene oxide and chloromethyl oxirane; and

vinyl chloride and vinylidene chloride.

29. The blend of claim 3 wherein said organic polymer is a non-elastomeric polymer.

30. The blend of claim 29 wherein said non-elastomeric polymer is polystyrene, low density polyethylene, high density polyethylene, linear low density polyethylene, or polychloromethyl oxirane.

31. The blend of claim 29 wherein said non-elastomeric polymer is a copolymer of:

an alkyl acrylate and acrylonitrile;

ethylene and vinyl acetate;

ethylene and propylene;

ethylene oxide and chloromethyl oxirane; and

vinyl chloride and vinylidene chloride.

32. The blend of claim 1 further comprising an inorganic filler or pigment.

33. The blend of claim 1 which is shaped and formed into a gasket, membrane, hose, tube or other article of manufacture.

34. The blend of claim 1 wherein the ratio of said polysulfide elastomer and said organic polymer are suitable for use in a sealant or adhesive composition.