US4348312A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ultra-high-index glass microspheres and products made therefrom with a fluoropolymer and an ester polymer blend
Assignee: 3M Co
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Filing: 1981-03-11
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Granted: 1982-09-07
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Expires: 2001-03-11
Abstract
Abstract Compositions comprising copolymers of methyl methacrylate and ethyl acrylate and of vinylidene fluoride and hexafluoropropylene may be blended to form transparent compositions of low refractive index, making them useful in retroreflective products as a layer in which glass microspheres are embedded.
Inventors
- 👤 Chi F. Tung
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:32
CPC Classifications
C; C08; C08K; C08K7/00; C08K7/16; C08K7/18; C08K7/20; C03; C03C; C03C12/00; C03C12/02; C03C3/00; C03C3/12; C03C3/127; C08J; C08J5/00; C08J5/18; C08L; C08L27/00; C08L27/02; C08L27/12; C08L27/16; C08L33/00; C08L33/04; C08L33/06; C08L33/10; C08L33/12; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24355; Y10T428/24372; Y10T428/2438; Y10T428/24421; Y10T428/31504; Y10T428/31678; Y10T428/31692; Y10T428/31699; Y10T428/31786; Y10T428/31797; Y10T428/31855
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
62 words
Retroreflective film comprising a layer in which glass microspheres are at least partially embedded, said layer comprising a transparent blend of 1 to 99 weight-parts of a copolymer that comprises about 3 parts of methylmethacrylate and 1 part of ethyl acrylate and 99 to 1 weight-parts of a copolymer that comprises about 3 parts of vinylidene fluoride and 1 part of hexafluoropropylene.
Claim 2
Dependent Claim
62 words
Retroreflective film comprising a layer in which glass microspheres are at least partially embedded, said layer comprising a transparent blend of 1 to 99 weight-parts of a copolymer that comprises about 3 parts of methylmethacrylate and 1 part of ethyl acrylate and 99 to 1 weight-parts of a copolymer that comprises about 3 parts of vinylidene fluoride and 1 part of hexafluoropropylene.
Claim 3
Dependent Claim
36 words
Retroreflective film of claim 1 in which said layer comprises 1 to 50 weight-parts of the copolymer of methyl methacrylate and ethyl acrylate and 99 to 50 weight-parts of the copolymer of vinylidene fluoride and hexafluoropropylene.
Claim 4
Dependent Claim
37 words
Retroreflective film of claim 2 in which said layer comprises about 20 to 40 weight-parts of the copolymer of methylmethacrylate and ethyl acrylate and about 60 to 80 weight-parts of the copolymer of vinylidene fluoride and hexafluoropropylene.
Claim 5
Dependent Claim
15 words
Retroreflective film of claims 1, 2 or 3 in the form of a self-supporting sheet.
Claim 6
Dependent Claim
64 words
Coating composition that comprises a blend of 1 to 99 of weight-parts of a copolymer that comprises about 3 parts of methyl methacrylate and 1 part of ethyl acrylate and 99 to 1 weight-parts of a copolymer that comprises about 3 parts of vinylidene fluoride and 1 part of hexafluoropropylene and glass microspheres dispersed in the blend and hemispherically coated with specularly reflective metal.
Claim 7
Dependent Claim
64 words
Coating composition that comprises a blend of 1 to 99 of weight-parts of a copolymer that comprises about 3 parts of methyl methacrylate and 1 part of ethyl acrylate and 99 to 1 weight-parts of a copolymer that comprises about 3 parts of vinylidene fluoride and 1 part of hexafluoropropylene and glass microspheres dispersed in the blend and hemispherically coated with specularly reflective metal.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-09-06 | 1986-03-08 | 1986-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-09-06 | 1990-03-08 | 1990-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-09-06 | 1994-03-08 | 1994-09-07 | $7700.00 | Window Closed / Lapsed |