US4737526A
Expired / Lapsed
US
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Expandable fluorine-contained polymer compositions and foams of fluorine-contained polymer obtained from the compositions
Assignee: Asahi Kasei Corp
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Filing: 1986-11-07
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Granted: 1988-04-12
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Expires: 2006-11-07
Abstract
Abstract An expandable fluorine-contained polymer composition comprising (A) a fluorine-contained polymer in which the ratio (tan δ) of dynamic loss modulus to dynamic storage modulus at a temperature 30° C. higher than the melting point of the polymer ranges from 0.3 to 0.9, and (B) a blowing agent, and a foam obtained from said composition.
Inventors
- 👤 Shigemi Mukaiyama
- 👤 Shoji Noro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:40
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/12; C08J9/14; C08J9/141; C08J9/143; C08J2327/00; C08J2327/02; C08J2327/12; Y; Y10; Y10S; Y10S521/00; Y10S521/915
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
49 words
An expandable fluorine-contained polymer composition comprising (A) a crystalline crosslinked fluorine-containing polymer in which the ratio (tan δ) of dynamic loss modulus to dynamic storage modulus at a temperature 30° C. higher than the melting point of the polymer of from 0.3 to 0.9, and (B) a blowing agent.
Claim 2
Dependent Claim
49 words
An expandable fluorine-contained polymer composition comprising (A) a crystalline crosslinked fluorine-containing polymer in which the ratio (tan δ) of dynamic loss modulus to dynamic storage modulus at a temperature 30° C. higher than the melting point of the polymer of from 0.3 to 0.9, and (B) a blowing agent.
Claim 3
Dependent Claim
15 words
A composition according to claim 1, wherein said tan δ of from 0.35 to 0.8.
Claim 4
Dependent Claim
35 words
A composition according to claim 1, wherein said crystalline fluorine-containing polymer has as its main component at least one monomer selected from the group consisting of fluoroethylene, fluoro-α-olefins, fluoroalkyl fluorovinyl ethers and fluoroalkyl vinyl ethers.
Claim 5
Dependent Claim
32 words
A composition according to claim 1, wherein said crystalline fluorine-containing polymer is selected from the group consisting of ethylene-tetrafluoroethylene copolymers, polyvinylidene fluorides, vinylidene fluoride-hexafluoropropylene copolymers, vinylidene fluoride-tetrafluoroethylene copolymers and vinylidene fluoride-hexafluoropropylene-tetrafluoroethylene copolymers.
Claim 6
Dependent Claim
55 words
A composition according to claim 1, wherein said blowing agent has a solubility in said polymer of 0.02 mol or more per kg of said polymer, and a rate of blowing agent loss from said polymer (25° C.) of less than 20% of add-on per 0.1 day in a sheet of 1.2 mm in thickness.
Claim 7
Dependent Claim
43 words
A composition according to claim 5, wherein said solubility is 0.04 mol or more per kg of said polymer and said rate of blowing agent loss is 10% or less of add-on per 0.1 day in a sheet of 1.2 mm in thickness.
Claim 8
Dependent Claim
54 words
A foam of fluorine-contained polymer obtained by expanding, at an expansion ratio of at least 1.5-fold, a crosslinking crystalline fluorine-containing polymer having a crosslinked structure in which the ratio (tan δ) of dynamic loss modulus to dynamic storage modulus at a temperature 30° C. higher than the melting point of from 0.3 to 0.9.
Claim 9
Dependent Claim
54 words
A foam of fluorine-contained polymer obtained by expanding, at an expansion ratio of at least 1.5-fold, a crosslinking crystalline fluorine-containing polymer having a crosslinked structure in which the ratio (tan δ) of dynamic loss modulus to dynamic storage modulus at a temperature 30° C. higher than the melting point of from 0.3 to 0.9.
Claim 10
Dependent Claim
41 words
A foam according to claim 7, wherein said crystalline fluorine-containing polymer is one which is obtained by using as its main component at least one monomer selected from the group consisting of fluoroethylene, fluoro-α-olefins, fluoroalkyl fluorovinyl ethers, and fluoroalkyl vinyl ethers.
Claim 11
Dependent Claim
15 words
A foam according to claim 7, wherein said tan δ ranges from 0.35 to 0.8.
Claim 12
Dependent Claim
32 words
A foam according to claim 7, wherein said crystalline fluorine-containing polymer is selected from the group consisting of ethylene-tetrafluoroethylene copolymers, polyvinylidene fluorides, vinylidene fluoride-hexafluoropropylene copolymers, vinylidene fluoride-tetrafluoroethylene copolymers and vinylidene fluoride-hexafluoropropylene-tetrafluoroethylene copolymers.
Claim 13
Dependent Claim
17 words
A foam according to claim 7, which has an average cell diameter of 90 μm or less.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1991-04-12 | 1991-10-12 | 1992-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-04-12 | 1995-10-12 | 1996-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-04-12 | 1999-10-12 | 2000-04-12 | $7700.00 | Window Closed / Lapsed |