US5308693A
Expired / Lapsed
US
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Unstretched synthetic papers and methods of producing same
Assignee: Clopay Plastic Products Co Inc
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Filing: 1990-06-26
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Granted: 1994-05-03
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Expires: 2010-06-26
Abstract
Abstract Novel, unstretched synthetic papers being virtually free of mechanically produced microvoids and having a porous surface for writing and printing thereon are disclosed. The unstretched synthetic papers of the instant invention are formed typically by extruding from pellets a film or sheet material formed with a continuous olefin resin matrix containing an effective amount of a particulate filler having pre-existing microvoids inherent thereto, such as a diatamaceous earth. The microvoid particulate filler is dispersed somewhat uniformly yet randomly throughout the continuous olefin resin matrix of the unstretched synthetic papers to provide non-mechanically produced microvoids in communication with the surfaces of the unstretched synthetic papers to render said surfaces porous for imparting writeability and printability thereto. Additional paper-like characteristics can be imparted to the novel, unstretched synthetic papers of the instant invention by the addition of other resins, such as a styrene resin, to the continuous olefin resin matrix. The novel, unstretched synthetic papers of the present invention have good receptivity and retentivity for common writing materials, such as ink, pencil lead, paint and the like, even though they are not mechanically stretched to form mechanically produced microvoids.
Inventors
- 👤 Thomas R. Ryle
- 👤 Pai-Chuan Wu
- 👤 Leopoldo V. Cancio
- 👤 Girish K. Sharma
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:31
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/18; C08J2323/00; C08J2323/02; C08J2323/04; C08J2323/06; C08J2323/10; C08J2323/12; Y; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249955; Y10T428/249956; Y10T428/249957; Y10T428/249978; Y10T428/25; Y10T428/258; Y10T428/259; Y10T428/31504; Y10T428/31971; Y10T428/31993
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
78 words
A synthetic paper substantially free of mechanically produced microvoids for writing and printing thereon, said synthetic paper consisting essentially of a continuous high density polyethylene matrix having uniformly dispersed therein an effective amount of filler particles having microvoids, said dispersed particles being exposed at a surface of said paper, said filler particles having microvoids at said surface for receiving and retaining ink or similar imaging material in the microvoids thereby imparting writeability and printability to said synthetic paper.
Claim 2
Dependent Claim
78 words
A synthetic paper substantially free of mechanically produced microvoids for writing and printing thereon, said synthetic paper consisting essentially of a continuous high density polyethylene matrix having uniformly dispersed therein an effective amount of filler particles having microvoids, said dispersed particles being exposed at a surface of said paper, said filler particles having microvoids at said surface for receiving and retaining ink or similar imaging material in the microvoids thereby imparting writeability and printability to said synthetic paper.
Claim 3
Dependent Claim
16 words
A synthetic paper as recited in claim 1 wherein said particulate filler is a diatamaceous earth.
Claim 4
Dependent Claim
28 words
A synthetic paper as recited in claim 1 wherein said particulate filler is selected from a group consisting of volcanic ash, silica gels, styrogels and porous glass beads.
Claim 5
Dependent Claim
49 words
A synthetic paper as recited in claim 1 wherein said polyethylene is present in said continuous matrix in an amount of about 60% to about 90% by weight and said particulate filler is present in said continuous matrix in an amount of about 10% to about 40% by weight.
Claim 6
Dependent Claim
25 words
A synthetic paper as recited in claim 1, said synthetic paper being an in-mold label for a plastic structure, said in-mold label having indicia thereon.
Claim 7
Dependent Claim
39 words
A synthetic paper as recited in claim 1 wherein said synthetic paper is in the form selected from the group consisting of a writing paper, envelope, card, tape, overwrap, bag, cup, greeting card, label, packaging paper and poster paper.
Claim 8
Dependent Claim
18 words
A synthetic paper as recited in claim 1 wherein said continuous polyethylene matrix further includes a styrene resin.
Claim 9
Dependent Claim
18 words
A synthetic paper as recited in claim 1 wherein said continuous polyethylene matrix further includes an inorganic filler.
Claim 10
Dependent Claim
24 words
A synthetic paper as recited in claim 8 wherein said inorganic filler is present in an amount of up to about 20% by weight.
Claim 11
Dependent Claim
27 words
A synthetic paper as recited in claim 1 wherein said synthetic paper has a thickness in the range of between about 1 mil to about 10 mils.
Claim 12
Dependent Claim
27 words
A synthetic paper as recited in claim 1 wherein said synthetic paper has a thickness in the range of between about 2 mils and about 5 mils.
Claim 13
Dependent Claim
18 words
A synthetic paper as recited in claim 1 wherein said continuous polyethylene matrix further includes an anti-static agent.
Claim 14
Dependent Claim
101 words
A synthetic paper substantially free of mechanically produced microvoids for writing and printing thereon, said synthetic paper being formed with a continuous matrix consisting essentially of ______________________________________
high density polyethylene,
about 60-75%
polystyrene about 5-10%
calcium carbonate, about 5-10%
diatamaceous earth, and
about 10-20%, and
titanium oxide about 0-5%
______________________________________ wherein said diatamaceous earth having microvoids and being dispersed throughout the continuous matrix to expose said microvoids at a surface of said synthetic paper, said microvoids exposed at said surface for receiving and retaining ink or similar imaging material in the microvoids for imparting writeability and printability to said synthetic paper.
Claim 15
Dependent Claim
101 words
A synthetic paper substantially free of mechanically produced microvoids for writing and printing thereon, said synthetic paper being formed with a continuous matrix consisting essentially of ______________________________________
high density polyethylene,
about 60-75%
polystyrene about 5-10%
calcium carbonate, about 5-10%
diatamaceous earth, and
about 10-20%, and
titanium oxide about 0-5%
______________________________________ wherein said diatamaceous earth having microvoids and being dispersed throughout the continuous matrix to expose said microvoids at a surface of said synthetic paper, said microvoids exposed at said surface for receiving and retaining ink or similar imaging material in the microvoids for imparting writeability and printability to said synthetic paper.
Claim 16
Dependent Claim
25 words
A synthetic paper as recited in claim 13, said synthetic paper being an in-mold label for a plastic article, said in-mold label having indicia thereon.
Claim 17
Dependent Claim
35 words
A synthetic paper as recited in claim 13, said synthetic paper being selected from a group consisting of a writing paper, envelope, label, card, greeting card, tape, bag, cup, overwrap, poster paper and packaging paper.
Claim 18
Dependent Claim
35 words
A synthetic paper as recited in claim 13, said continuous matrix comprising ______________________________________
high density polyethylene
about 62%,
polystyrene about 7%,
calcium carbonate about 7%,
diatamaceous earth about 19%, and
titanium oxide about 5%.
______________________________________
Claim 19
Dependent Claim
16 words
A synthetic paper as recited in claim 16, said continuous matrix further including an anti-static agent.
Claim 20
Dependent Claim
35 words
A synthetic paper as recited in claim 13, said continuous matrix comprising ______________________________________
high density polyethylene
about 71%,
polystyrene about 8%,
calcium carbonate about 5%,
diatamaceous earth about 10%, and
titanium oxide about 6%.
______________________________________
Claim 21
Dependent Claim
16 words
A synthetic paper as recited in claim 18, said continuous matrix further including an anti-static agent.
Claim 22
Dependent Claim
16 words
A synthetic paper as recited in claim 13, said continuous matrix further including an anti-static agent.
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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) | 1997-05-02 | 1997-11-01 | 1998-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-05-02 | 2001-11-01 | 2002-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-05-02 | 2005-11-01 | 2006-05-03 | $7700.00 | Window Closed / Lapsed |