US4496620A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Opaque oriented non-thermoplastic polymer film and method of forming same
Assignee: Mobil Oil AS
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Filing: 1983-11-25
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Granted: 1985-01-29
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Expires: 2003-11-25
Abstract
Abstract An opaque oriented non-thermoplastic polymer film containing opacifying voids which opacifying voids contain rigid microspheres therein. The method of preparing such an opaque oriented non-thermoplastic film by incorporating rigid microspheres within the non-thermoplastic polymer forming a film thereof and orienting the same to create opacifying voids therein.
Inventors
- 👤 Hee C. Park
- 👤 Charles R. Ashcraft
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 01:45
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/18; B; B29; B29C; B29C48/00; B29C48/03; B29C48/07; B29C48/08; B29K; B29K2007/00; B29K2027/00; B29K2027/06; B29K2033/00; B29K2033/18; B29K2033/20; B29K2105/00; B29K2105/06; B29K2105/16; B29L; B29L2007/00; Y; Y10; Y10S; Y10S428/00; Y10S428/91; Y10T; Y10T428/00; Y10T428/25; Y10T428/252; Y10T428/254; Y10T428/256; Y10T428/26; Y10T428/268; Y10T428/31504; Y10T428/31855
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
90 words
An opaque, oriented non-thermoplastic polymer film containing a strata of voids therein, positioned at least substantially within at least a substantial number of said voids, is at least one at least generally spherical void-initiating, solid particle which is phase-distinct and incompatible with said polymer, the void occupied by said particle being substantially less than the volume of said void, with one generally cross-sectional dimension of said particle at least approximately a corresponding cross-sectional dimension of said void, the population of voids in said film being such as to cause opacity.
Claim 2
Dependent Claim
90 words
An opaque, oriented non-thermoplastic polymer film containing a strata of voids therein, positioned at least substantially within at least a substantial number of said voids, is at least one at least generally spherical void-initiating, solid particle which is phase-distinct and incompatible with said polymer, the void occupied by said particle being substantially less than the volume of said void, with one generally cross-sectional dimension of said particle at least approximately a corresponding cross-sectional dimension of said void, the population of voids in said film being such as to cause opacity.
Claim 3
Dependent Claim
22 words
The film of claim 1 wherein said non-thermoplastic polymer is a member selected from the group consisting of polyvinyl alcohol and polyacrylonitrile.
Claim 4
Dependent Claim
18 words
The film of claim 2 wherein said spherical particles have a particle size ranging from about 0.1-10 microns.
Claim 5
Dependent Claim
13 words
The film of claim 3 wherein said spherical particles are inorganic or organic.
Claim 6
Dependent Claim
24 words
The film of claim 4 wherein said spheres are present in from 2 to 30% by weight based on the weight of said film.
Claim 7
Dependent Claim
15 words
The film of claim 5 wherein the resin, the spheres or both contain coloring pigments.
Claim 8
Dependent Claim
12 words
The film of claim 3 wherein said non-thermoplastic resin is polyvinyl alcohol.
Claim 9
Dependent Claim
11 words
The film of claim 3 wherein said non-thermoplastic resin is polyacrylonitrile.
Claim 10
Dependent Claim
42 words
The structure of claim 1 wherein said voids have a dimension of X, Y and Z, wherein dimensions X and Y are major dimensions and dimension Z is a minor dimension at least generally corresponding to the diameter of said spherical particle.
Claim 11
Dependent Claim
15 words
The structure of claim 4 wherein dimensions X and Y are multiples of dimension Z.
Claim 12
Independent Claim
52 words
The method of preparing an opaque, oriented, non-thermoplastic film comprising: uniformly dispersing rigid microspheres within an orientable non-thermoplastic polymer said microspheres being at least substantially non-adherent to said polymer, forming a water-containing film of the microspheres-containing polymer; and biaxially stretching said film so as to form a strata of opacifying voids therein.
Claim 13
Independent Claim
52 words
The method of preparing an opaque, oriented, non-thermoplastic film comprising: uniformly dispersing rigid microspheres within an orientable non-thermoplastic polymer said microspheres being at least substantially non-adherent to said polymer, forming a water-containing film of the microspheres-containing polymer; and biaxially stretching said film so as to form a strata of opacifying voids therein.
Claim 14
Dependent Claim
21 words
The method of claim 11 wherein said polymer is a member selected from the group consisting of polyvinyl alcohol and polyacrylonitrile.
Claim 15
Dependent Claim
28 words
The method of claim 12 wherein said polymer is polyvinyl alcohol and said water is the residue of an amount permitting formation of the polymer in film form.
Claim 16
Dependent Claim
18 words
The method of claim 13 wherein said film contains from about 10-20% by weight water content before stretching.
Claim 17
Dependent Claim
46 words
The method of claim 12 wherein said polymer is polyacrylonitrile and the microspheres-containing polyacrylonitrile dispersion is initially formed into a dimethyl sulfoxide containing film which is thereafter treated with water to at least substantially exchange said dimethyl sulfoxide therein with water to form said water-containing film.
Claim 18
Dependent Claim
23 words
The method of claim 15 wherein said water-containing film is biaxially stretched and while in said condition, dried to substantially remove water therefrom.
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) | 1988-01-29 | 1988-07-30 | 1989-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-01-29 | 1992-07-30 | 1993-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-01-29 | 1996-07-30 | 1997-01-29 | $7700.00 | Window Closed / Lapsed |