Patent US4737526A successfully refreshed from Google Patents.
US4737526A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Expandable fluorine-contained polymer compositions and foams of fluorine-contained polymer obtained from the compositions
Assignee: Asahi Kasei Corp
•
Filing: 1986-11-07
•
Granted: 1988-04-12
•
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 19:35
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.
References Cited (Backward Citations)
US3072582A
Cited
US3868337A
Cited
US3868327A
Cited
US3983080A
Cited
JPS5225860A
Cited
JPS5789932A
Cited
US4331619A
Cited
US4425443A
Cited
JPS57177081A
Cited
US4615850A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 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 |