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US5278196A Expired / Lapsed US ⏱️ 0.0 years remaining

Hydrofluorocarbon compositions as blowing agents for cellular plastics

Assignee: PCBU Services Inc
•
Filing: 1993-03-25
•
Granted: 1994-01-11
•
Expires: 2013-03-25
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Abstract

Abstract Blowing agents for use in foamable plastics such as polystyrene, polyvinyl chloride, polyethylene and other non-polyisocyanate-based foams, comprising a mixture of 1,1,1,2,3,3,3-heptafluoropropane in combination with one or more hydrocarbons or partially halogenated alkanes. In one aspect of the invention the hydrocarbon adjuvant is selected from the group consisting of propane, butane, isobutane, n-pentane, i-pentane, neopentane, n-hexane, 2-methylpentane, 3-methylpentane and 2,2-dimethylbutane. In another aspect of the invention the halogenated alkane is selected from the group consisting of ethyl chloride, 2,2-dichloro-1,1,1-trifluoroethane (HCFC-123), 1,1-dichloro-1-fluoroethane (HCFC-141b), 1-chloro-1,1-difluoroethane (HCFC-142b), 2-chloro-1,1,1,2-tetrafluoroethane (HCFC-124), 3,3-dichloro-1,1,1,2,2-pentafluoropropane (HCFC-225ca), 1,3-dichloro-1,1,2,2,3-pentafluoropropane (HCFC-225cb), 1,1-difluoroethane (HFC-152a), 1,1,1-trifluoroethane (HFC-143a), 1,1,1,2-tetrafluoroethane (HFC-134a), 1,1,2,2-tetrafluoroethane (HFC-134), 1,1,2,2,3-pentafluoropropane (HFC-245ca), 1,1,1,2,3,3-hexafluoropropane (HFC-236ea), and 1,1,2,3,3-pentafluoropropane (HFC-245ea).

Inventors

  • 👤 Mark L. Robin
  • 👤 Yuichi Iikubo
  • 👤 W. Douglas Register
  • 👤 Richard S. Rose

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-07 20:15
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/12; C08J9/14; C08J9/143; C08J9/144; C08J9/149; Y; Y10; Y10S; Y10S264/00; Y10S264/05; Y10S521/00; Y10S521/91

Claims Analysis

Total Claims: 12
Claim 1
Independent Claim 34 words
A composition comprising: (a) a foamable plastic which is essentially free of polyisocyanate-based polymers; and (b) a blowing agent consisting essentially of 1,1,1,2,3,3,3-heptafluoropropane in combination with one or more hydrocarbons or partially halogenated alkanes.
Claim 2
Dependent Claim 34 words
A composition comprising: (a) a foamable plastic which is essentially free of polyisocyanate-based polymers; and (b) a blowing agent consisting essentially of 1,1,1,2,3,3,3-heptafluoropropane in combination with one or more hydrocarbons or partially halogenated alkanes.
Claim 3
Dependent Claim 22 words
The polymer foam of claim 1, wherein the foamable plastic is selected from the group consisting of polystyrene, Polyvinyl chloride and polyethylene.
Claim 4
Dependent Claim 28 words
The polymer foam of claim 1, wherein the hydrocarbon adjuvant is selected from the group consisting of propane, butane, isobutane, n-pentane, i-pentane, neopentane, n-hexane, 2-methylpentane, 3-methylpentane and 2,2-dimethylbutane.
Claim 5
Dependent Claim 46 words
The polymer foam of claim 1, wherein the halogenated alkane is selected from the group consisting of ethyl chloride, 2,2-dichloro-1,1,1-trifluoroethane (HCFC-123), 1,1-dichloro-1-fluoroethane (HCFC-141b), 1-chloro-1,1-difluoroethane (HCFC-142b), 2-chloro-1,1,1,2-tetrafluoroethane (HCFC-124), 3,3-dichloro-1,1,1,2,2-pentafluoropropane (HCFC-225ca), 1,3-dichloro-1,1,2,2,3-pentafluoropropane (HCFC-225cb), 1,1-difluoroethane (HFC-152a), 1,1,1-trifluoroethane (HFC-143a), 1,1,1,2-tetrafluoroethane (HFC-134a), 1,1,2,2-tetrafluoroethane (HFC-134), 1,1,2,2,3-pentafluoropropane (HFC-245ca), 1,1,1,2,3,3-hexafluoropropane (HFC-236ea), and 1,1,2,3,3-pentafluoropropane (HFC-245ea).
Claim 6
Dependent Claim 26 words
The polymer foam of claim 4, wherein the halogenated alkane is selected from the group consisting of 2-chloro-1,1,1,2-tetrafluoroethane (HCFC-124), 1,1,2,2-tetrafluoroethane (HFC-134), 1-chloro-1,1-difluoroethane (HCFC-142b) and 1,1,1,2,3,3-hexafluoropropane (HFC-236ea).
Claim 7
Dependent Claim 13 words
The polymer foam of claim 5, wherein the halogenated alkane is 2-chloro-1,1,1,2-tetrafluoroethane (HCFC-124).
Claim 8
Dependent Claim 13 words
The polymer foam of claim 5, wherein the halogenated alkane is 1,1,2,2-tetrafluoroethane (HFC-134).
Claim 9
Dependent Claim 13 words
The polymer foam of claim 5, wherein the halogenated alkane is 1-chloro-1,1-difluoroethane (HCFC-142b).
Claim 10
Dependent Claim 13 words
The polymer foam of claim 5, wherein the halogenated alkane is 1,1,1,2,3,3-hexafluoropropane (HFC-236ea).
Claim 11
Dependent Claim 38 words
The polymer foam of claim 1, wherein the concentration of 1,1,1,2,3,3,3-heptafluoropropane is between about 5 to 95 percent by weight, and the concentration of the hydrocarbon or halogenated alkane is between about 95 and 5 percent by weight.
Claim 12
Dependent Claim 38 words
The polymer foam of claim 10, wherein the concentration of 1,1,1,2,3,3,3-heptafluoropropane is between about 60 and 95 percent by weight, and the concentration of the hydrocarbon or halogenated alkane is between about 5 and 40 percent by weight.

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USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1997-01-10 1997-07-12 1998-01-11 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 2001-01-10 2001-07-12 2002-01-11 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2005-01-10 2005-07-12 2006-01-11 $7700.00 Window Closed / Lapsed

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