Foam including surface-modified nanoparticles

• US 6,586,483 B2
• Filed: 01/08/2001
• Issued: 07/01/2003
• Est. Priority Date: 01/08/2001
• Status: Expired due to Term

• Current Assignee: 3M Innovative Properties Company (3M Company)
• Original Assignee: 3M Innovative Properties Company (3M Company)
• Inventors: Baran, Jimmie R. Jr., Lehmann, Megan P., Sokalski, John S., Johnson, Gordon G., Kolb, Brant U., Johnson, Michael A.
• Primary Examiner(s): Foelak, Morton
• Application Number:
  US09/756,422
• Publication Number:
  US 20020128336A1
• Time in Patent Office: 904 Days
• Field of Search: 521/91, 521/92, 521/154
• US Class Current: 521/91
• CPC Class Codes: C08J 2207/02 Adhesive
• CPC Class Codes: C08J 9/0066 Use of inorganic compounding ingredients
• CPC Class Codes: C08J 9/12 by a physical blowing agent
• CPC Class Codes: C09J 11/04 inorganic
• CPC Class Codes: C09J 2433/00 Presence of (meth)acrylic polymer
• CPC Class Codes: C09J 7/38 Pressure-sensitive adhesives [PSA]

Abstract

A foam composition that includes a vehicle and surface-modified nanoparticles disposed in the vehicle. The individual nanoparticles having a particle diameter of less than about 100 nanometers.

Claims

1. A foam composition comprising:

a vehicle; and

surface-modified nanoparticles disposed in said vehicle, said individual nanoparticles having a particle diameter of less than about 100 nanometers.

2. The foam composition of claim 1, wherein said foam is essentially free of surfactant.

3. The foam composition of claim 1, further comprising surfactant.

4. The foam composition of claim 1, wherein said surface-modified nanoparticles comprise at least about 0.5% by weight of said composition.

5. The foam composition of claim 1, wherein said surface-modified nanoparticles comprise at least about 1% by weight of said composition.

6. The foam composition of claim 1, wherein said surface-modified nanoparticles comprise at least about 2% by weight of said composition.

7. The foam composition of claim 1, wherein said surface-modified nanoparticles comprise at least about 5% by weight of said composition.

8. The foam composition of claim 1, wherein said surface-modified nanoparticles comprise at least about 10% by weight of said composition.

9. The foam composition of claim 1, wherein said individual nanoparticles have a particle diameter no greater than about 50 nanometers.

10. The foam composition of claim 1, wherein said individual nanoparticles have a particle diameter in the range of from about 3 nanometers to about 50 nanometers.

11. The foam composition of claim 1, wherein said individual nanoparticles have a particle diameter of no greater than about 20 nanometers.

12. The foam composition of claim 1, wherein said individual nanoparticles have a particle diameter in the range of from about 3 nanometers to about 20 nanometers.

13. The foam composition of claim 1, wherein said individual nanoparticles have a particle diameter in the range of from about 3 nanometers to about 10 nanometers.

14. The foam composition of claim 1, wherein said nanoparticles are selected from the group consisting of silica, titania, alumina, zirconia, vanadia, ceria, iron oxide, antimony oxide, tin oxide, aluminum/silica and combinations thereof.

15. The foam composition of claim 1, wherein said nanoparticles comprise surface groups selected from the group consisting of hydrophobic groups, hydrophilic groups and combinations thereof.

16. The foam composition of claim 1, wherein said nanoparticles comprise surface groups derived from an agent selected from the group consisting of silane, organic acid, organic base and combinations thereof.

17. The foam composition of claim 1, wherein said nanoparticles comprise organosilyl surface groups derived from an agent selected from the group consisting of alkylsilane, arylsilane, alkoxysilane and combinations thereof.

18. The foam composition of claim 1, wherein said nanoparticles comprise surface groups derived from an agent selected from the group consisting of carboxylic acids, sulfonic acids, phosphonic acids and combinations thereof.

19. The foam composition of claim 1, wherein said vehicle comprises monomer, oligomer or polymer or a combination thereof.

20. The foam composition of claim 1, wherein said vehicle comprises a polymer selected from the group consisting of thermoplastic polymer, thermoset polymer, elastomer and mixtures thereof.

21. The foam composition of claim 1, wherein said vehicle comprises a polymer is selected from the group consisting of natural rubber, synthetic rubber, acrylonitrile-butadiene rubber, polyisoprene rubber, polychloroprene rubber, polybutadiene rubber, butyl rubber, ethylene-propylene-diene monomer rubber, ethylene-propylene rubber, styrene-butadiene copolymer, styrene-isoprene copolymer, styrene-butadiene-styrene rubber, styrene-isoprene-styrene rubber, styrene-ethylene-butylene-styrene rubber, styrene-ethylene-propylene-styrene rubber, polyisobutylene rubber, ethylene-vinyl acetate rubber, silicone rubber, polyvinyl ethers and combinations thereof.

22. The foam composition of claim 1, wherein said vehicle comprises a polymer selected from the group consisting of polyester, polyurethane, amino resin, alkyd resin, phenolic resin, epoxy resin, isocyanate resin, isocyanurate resin, polysiloxane resin and mixtures thereof.

23. The foam composition of claim 1, wherein said vehicle comprises a polymer selected from the group consisting of polyacrylonitrile, acrylonitrile-butadiene-styrene, styrene-acrylonitrile, cellulosic polymers, chlorinated polyether, ethylene vinyl acetate copolymers, polyamides, polyimides, polycarbonates, polyolefins, polyethylene terephthalate, polyphenylene oxide, polystyrene, polyurethane, polyisocyanurates, polyvinyl chloride, polyvinyl acetate, polyvinyl alcohol, polyvinyl butyral, polyvinyl pyrrolidone, polyvinylidene chloride and mixtures thereof.

24. The foam composition of claim 1, wherein said vehicle comprises acrylic resin.

25. The foam composition of claim 19, wherein said acrylic resin comprises acrylic or methacrylic acid ester of a monohydric alcohol having from 1 to 20 carbon atoms.

26. The foam composition of claim 1, wherein said vehicle is nonpolymerizable.

27. The foam composition of claim 1, wherein said vehicle is essentially free of polymer.

28. The foam composition of claim 1, wherein said vehicle comprises polyolefin.

29. The foam composition of claim 1, wherein said vehicle comprises metallocene polymerized polyolefin.

30. The foam composition of claim 1, wherein said vehicle comprises resin selected from the group consisting of novolac resin, resole resin and polyurea resin and mixtures thereof.

31. The foam composition of claim 1, wherein said vehicle comprises isooctyl acrylate and acrylic acid.

32. The foam composition of claim 1, wherein said vehicle is selected from the group consisting of water, alcohols, aldehydes, ketones, esters, ethers, amines, amides, hydrocarbons, halocarbons and mixtures thereof.

33. The foam composition of claim 1, further comprising a foaming agent.

34. The foam composition of claim 1, wherein said surface-modified nanoparticles comprise statistically averaged randomly surface-modified nanoparticles.

35. The foam composition of claim 1, wherein said surface-modified nanoparticles comprise surface groups having a solubility parameter similar to the solubility parameter of said vehicle.

36. The foam composition of claim 1, wherein said surface-modified nanoparticles appear to be dissolved in said vehicle.

37. The foam composition of claim 1 wherein said vehicle comprises an adhesive composition.

38. The foam composition of claim 1 wherein said vehicle comprises a pressure sensitive adhesive composition.

39. The foam composition of claim 38, wherein said pressure sensitive adhesive composition comprises acrylic resin.

40. The foam composition of claim 39, wherein said acrylic resin comprises acrylic or methacrylic acid ester of a monohydric alcohol having from 1 to 20 carbon atoms.

41. The foam composition of claim 38 wherein said vehicle comprises isooctyl acrylate and acrylic acid copolymer.

42. The foam composition of claim 1, wherein said vehicle comprises a hot melt adhesive composition.

43. An adhesive tape comprising the foam composition of claim 1.

44. The adhesive tape of claim 43, further comprising a substrate, said foam composition being disposed on said substrate.

45. A pressure sensitive adhesive tape comprising the foam composition of claim 1.

46. The pressure sensitive adhesive tape of claim 45, wherein said foam composition comprises acrylic resin.

47. The pressure sensitive adhesive tape of claim 46, wherein said acrylic resin comprises acrylic or methacrylic acid ester of a monohydric alcohol having from 1 to 20 carbon atoms.

48. The pressure sensitive adhesive tape of claim 46 wherein said vehicle comprises isooctyl acrylate and acrylic acid copolymer.

49. The pressure sensitive adhesive tape of claim 45, further comprising a substrate, said foam composition being disposed on said substrate.

50. An article comprising the foam composition of claim 1.

51. A gasket comprising the foam composition of claim 1.

52. An automobile body molding comprising the foam composition of claim 1.

53. A method of making a foam composition, said method comprising introducing a foaming agent into a composition in an amount sufficient to form voids in said composition, said composition comprising a vehicle and surface-modified nanoparticles disposed in said vehicle, said surface-modified nanoparticles having a particle diameter of no greater than about 100 nanometers.

54. The method of claim 53, wherein said step of introducing a foaming agent comprises stirring said composition.

55. The method of claim 53, wherein said step of introducing a foaming agent comprises a chemical reaction of at least one component of the composition.

56. The method of claim 53, wherein said foaming agent is selected from the group consisting of liquid, gas and solid foaming agents.

57. The method of claim 53, wherein said foaming agent comprises a gas selected from the group consisting of air, nitrogen, oxygen, carbon dioxide, helium, argon, nitrous oxide, and mixtures thereof.

58. The method of claim 54, wherein said foaming agent comprises a degradation product of a component of the composition.

59. A method of making a tape, said method comprising:

substantially simultaneously

a) foaming a composition comprising

a vehicle, and

a plurality of surface-modified nanoparticles having an particle diameter of less than about 100 nanometers; and

b) coating said composition on a substrate.

60. A method of determining compatibility of a predetermined vehicle and surface-modified nanoparticles, said method comprising:

a) selecting surface-modified nanoparticles having a particle diameter of less than about 100 nanometers;

b) combining said surface-modified nanoparticles and said vehicle to form a composition; and

c) introducing a foaming agent into said composition,

wherein if said composition forms a persistent foam, said surface-modified nanoparticles are compatible with said vehicle.

61. A method of determining compatibility of a predetermined vehicle and surface-modified nanoparticles, said method comprising:

a) selecting surface-modified nanoparticles having a particle diameter of less than about 100 nanometers; and

b) combining said surface-modified nanoparticles and said vehicle to form a composition,

wherein, if said surface-modified nanoparticles appear to dissolve in said vehicle, said surface-modified nanoparticles are compatible with said vehicle.

62. A method for selecting compatible surface-modified nanoparticles for a predetermined vehicle, said method comprising

selecting surface-modified nanoparticles having a particle diameter of less than about 100, nanometers and comprising attached surface groups, said surface groups having a solubility parameter substantially similar to the solubility parameter of the predetermined vehicle;

dispersing said surface-modified nanoparticles in a vehicle; and

foaming said vehicle,

wherein the presence of a persistent foam indicates that the surface- modified nanoparticles are compatible with the vehicle.

63. A method of foaming a composition comprising

a) adding surface-modified nanoparticles identified by the method of claim 62 to the predetermined vehicle of claim 62; and

b) foaming the vehicle.