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US4861835A Expired / Lapsed US ⏱️ 0.0 years remaining

Polymer blend composition suitable as optical material

Assignee: Central Glass Co Ltd
•
Filing: 1987-12-22
•
Granted: 1989-08-29
•
Expires: 2007-12-22
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Abstract

Abstract A polymer blend of 2-80 wt % of an acrylic or methacrylic ester base polymer and the balance of a ternary copolymer of vinylidene fluoride (VDF), hexafluoroacetone (HFA) and tetrafluoroethylene (TFE) is very high in transparency and serves as a thermoplastic resin useful for optical purposes. The first polymer of the blend can be selected from homopolymers and copolymers of C 1 -C 4 alkyl acrylates and methacrylates. The second polymer is preferably made up of 2-15 mol % of HFA, 5-60 mol % of TFE and the balance of VDF. The polymer blend has a relatively low index of refraction, which can be controlled by selecting the first and second polymers and/or by varying the blending ratio. The polymer blend is soluble in various organic solvents. Besides, the polymer blend serves as a thermochromic material that becomes opaque by heating and resumes transparency by cooling.

Inventors

  • 👤 Kazuhiko Maeda
  • 👤 Taku Yamauchi
  • 👤 Toshio Koishi

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-28 22:21
CPC Classifications
C; C08; C08L; C08L27/00; C08L27/02; C08L27/12; C08L33/00; C08L33/04; C08L33/06; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/2964; Y10T428/2967

Claims Analysis

Total Claims: 11
Claim 1
Independent Claim 53 words
A polymer blend composition, consisting essentially of a blend of 2-80 wt % of a first polymer, which is an acrylic ormethacrylic ester base polymer, and the balance of a ymer which is a ternary copolymer of 2-5 mol % of hexafluoroacetone, 5-60 mol % of tetrafluoroethylene and the balance of vinylidene fluoride.
Claim 2
Dependent Claim 53 words
A polymer blend composition, consisting essentially of a blend of 2-80 wt % of a first polymer, which is an acrylic ormethacrylic ester base polymer, and the balance of a ymer which is a ternary copolymer of 2-5 mol % of hexafluoroacetone, 5-60 mol % of tetrafluoroethylene and the balance of vinylidene fluoride.
Claim 3
Dependent Claim 30 words
A composition according to claim 1, wherein said first polymer is an alkyl acrylate or methacrylate base polymer in which each alkyl group has not more than 4 carbon atoms.
Claim 4
Dependent Claim 13 words
A composition according to claim 2, wherein said first polymer is a homopolymer.
Claim 5
Dependent Claim 32 words
A composition according to claim 2, wherein said first polymer is a copolymer of at least two kinds of vinylic monomers at least one of which is an alkyl acrylate or methacrylate.
Claim 6
Dependent Claim 13 words
A composition according to claim 1 wherein said first polymer is polymethyl methacrylate.
Claim 7
Dependent Claim 13 words
A composition according to claim 1, wherein said first polymer is polymethyl acrylate.
Claim 8
Dependent Claim 13 words
A composition according to claim 1, wherein said first polymer is polyethyl methacrylate.
Claim 9
Dependent Claim 19 words
A composition according to claim 1 wherein said first polymer is a copolymer of methyl methacrylate and n-butyl acrylate.
Claim 10
Dependent Claim 23 words
A composition according to claim 1, wherein said blend is solidified from a melt of a mixture of said first and second polymers.
Claim 11
Dependent Claim 29 words
A composition according to claim 1, wherein said blend is solidified from a solution of said first and second polymers in an organic solvent by removal of said solvent.

References Cited (Backward Citations)

JPS5941348A Cited
JPS5962657A Cited
US4591616A Cited
US4617350A Cited
US4731417A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1992-08-28 1993-02-27 1993-08-29 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1996-08-28 1997-02-27 1997-08-29 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2000-08-28 2001-02-27 2001-08-29 $7700.00 Window Closed / Lapsed

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