US5489471A
Expired / Lapsed
US
⏱️ 0.0 years remaining
White resin film with excellent printability
Assignee: Yupo Corp
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Filing: 1994-09-21
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Granted: 1996-02-06
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Expires: 2014-09-21
Abstract
Abstract A white resin film having microvoids is disclosed, which is obtained by stretching a thermoplastic resin film comprising (a) from 40 to 65% by weight of a polypropylene resin, (b) from 1 to 20% by weight of ground calcium carbonate having a particle size of from 1 to 6 mu m and a specific surface area of from 10,000 to 34,800 cm2/g, and (c) from 30 to 50% by weight of precipitated calcium carbonate having a particle size of not smaller than 0.5 mu m and a specific surface area of from 35,000 to 50,000 cm2/g so as to have a void volume of from 20 to 70%. The film exhibits satisfactory printability in terms of whiteness and ink drying properties.
Inventors
- 👤 Masayuki Inoue
- 👤 Mitsuo Nakajima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:32
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/18; B; B29; B29C; B29C55/00; B29C55/02; B41; B41M; B41M5/00; B41M5/50; B41M5/502; B41M5/508; B41M5/52; C08J9/00; C08J9/0066; C08K; C08K3/00; C08K3/18; C08K3/24; C08K3/26; C08K7/00; C08K7/02; C08L; C08L23/00; C08L23/02; C08L23/10; C08J2323/00; C08J2323/02; C08J2323/10; Y; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249955; Y10T428/249956; Y10T428/25; Y10T428/258; Y10T428/27; Y10T428/31504; Y10T428/31855
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
93 words
A white resin film having microvoids which is obtained by stretching a thermoplastic resin film comprising (a) from 40 to 65% by weight of a polypropylene resin, (b) from 1 to 20% by weight of ground calcium carbonate having a particle size of from 1 to 6 μm, and (c) from 30 to 50% by weight of precipitated calcium carbonate having a particle size of not smaller than 0.5 μm, wherein the total amount of said ground calcium carbonate (b) and said precipitated calcium carbonate (c) is not more than 60% by weight.
Claim 2
Dependent Claim
93 words
A white resin film having microvoids which is obtained by stretching a thermoplastic resin film comprising (a) from 40 to 65% by weight of a polypropylene resin, (b) from 1 to 20% by weight of ground calcium carbonate having a particle size of from 1 to 6 μm, and (c) from 30 to 50% by weight of precipitated calcium carbonate having a particle size of not smaller than 0.5 μm, wherein the total amount of said ground calcium carbonate (b) and said precipitated calcium carbonate (c) is not more than 60% by weight.
Claim 3
Dependent Claim
45 words
A white resin film as claimed in claim 1, wherein said ground calcium carbonate has a specific surface area of from 10,000 to 34,800 cm 2 /g, and said precipitated calcium carbonate has a specific surface area of from 35,000 to 50,000 cm 2 /g.
Claim 4
Dependent Claim
31 words
A white resin film as claimed in claim 1, wherein the weight ratio (c)/(b) of said precipitated calcium carbonate (c) to said ground calcium carbonate (b) is from 2 to 30.
Claim 5
Dependent Claim
24 words
A white resin film as claimed in claim 1, wherein said white resin film has a degree of whiteness of not less than 80%.
Claim 6
Dependent Claim
24 words
A white resin film as claimed in claim 1, wherein said white resin film has a degree of whiteness of from 90 to 100%.
Claim 7
Dependent Claim
25 words
A white resin film as claimed in claim 1, wherein said ground calcium carbonate (b) has a particle size of from 3 to 4 μm.
Claim 8
Dependent Claim
25 words
A white resin film as claimed in claim 1, wherein said precipitated calcium carbonate (c) has a particle size of from 0.5 to 3 μm.
Claim 9
Dependent Claim
25 words
A white resin film as claimed in claim 7, wherein said precipitated calcium carbonate (c) has a particle size of from 1 to 2 μm.
Claim 10
Dependent Claim
18 words
A white resin film as claimed in claim 1, having a void volume of from 20 to 70%.
Claim 11
Dependent Claim
18 words
A white resin film as claimed in claim 9, having a void volume of from 25 to 50%.
Claim 12
Dependent Claim
15 words
A white resin film as claimed in claim 1, wherein said film is uniaxially stretched.
Claim 13
Dependent Claim
15 words
A white resin film as claimed in claim 1, wherein said film is biaxially stretched.
References Cited (Backward Citations)
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JPS62227933A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-02-05 | 1999-08-07 | 2000-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-02-05 | 2003-08-07 | 2004-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-02-05 | 2007-08-07 | 2008-02-06 | $7700.00 | Window Closed / Lapsed |