US5204179A
Expired / Lapsed
US
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Multilayered polyolefin structure
Assignee: Pactiv LLC
•
Filing: 1991-03-29
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Granted: 1993-04-20
•
Expires: 2011-03-29
Abstract
Abstract A multilayer structure designed to overcome the shortcomings of previously known thermoformed sheet structures. Articles may be formed by a method of the present invention having an attractive outer appearance associated with polyolefin films containing inert inorganic fillers while having the advantageous processing properties of oriented films. The present invention is directed to multilayer structures, methods for forming the multilayer structures as well as shaped articles formed from the multilayer structures. The multilayer structure has at least a first sheet layer comprising a polyolefin and preferably an inert organic filler, and a film layer which advantageously comprises an oriented polyolefin or polyester. The present invention may comprise one or more of each of the above described sheet and film layers.
Inventors
- 👤 Philip S. Baker
- 👤 Daniel L. Donk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:53
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/18; B32B27/20; B32B27/06; B32B27/08; B32B27/32; B32B27/36; B32B2250/00; B32B2250/24; B32B2305/00; B32B2305/30; B32B2307/00; B32B2307/50; B32B2307/514; B32B2307/518; B32B2323/00; B32B2323/10; B32B2367/00; B32B2439/00; Y; Y10; Y10S; Y10S428/00; Y10S428/91; Y10T; Y10T428/00; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/265; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913
Claims Analysis
Total Claims: 46
Claim 1
Independent Claim
56 words
A thermoplastic multilayer structure comprising: a first extruded sheet capable of thermoforming into end products which comprises a first polyolefin and an inert, inorganic filler material; and at least a film comprising a polymer selected from the group consisting of oriented polyolefins and oriented polyesters, joined to said first sheet, whereby sagging is prevented upon thermoforming.
Claim 2
Dependent Claim
56 words
A thermoplastic multilayer structure comprising: a first extruded sheet capable of thermoforming into end products which comprises a first polyolefin and an inert, inorganic filler material; and at least a film comprising a polymer selected from the group consisting of oriented polyolefins and oriented polyesters, joined to said first sheet, whereby sagging is prevented upon thermoforming.
Claim 3
Dependent Claim
14 words
A thermoplastic, multilayer structure according to claim 1 wherein said structure is substantially laminar.
Claim 4
Dependent Claim
26 words
A thermoplastic, multilayer structure according to claim 2 wherein said film consists essentially of said oriented, polyolefin and said film is laminated to said first sheet.
Claim 5
Dependent Claim
28 words
A thermoplastic, multilayer structure according to claim 1 wherein said filler material is selected from the group consisting of talc, calcium carbonate, dolomite, kaolin, gypsum, and mixtures thereof.
Claim 6
Dependent Claim
15 words
A thermoplastic, multilayer structure according to claim 1 wherein said first polyolefin comprises polypropylene homopolymer.
Claim 7
Dependent Claim
16 words
A thermoplastic, multilayer structure according to claim 5 wherein said oriented polyolefin comprises biaxially oriented polypropylene.
Claim 8
Dependent Claim
16 words
A thermoplastic, multilayer structure according to claim 1 wherein said oriented polyolefin comprises biaxially oriented polypropylene.
Claim 9
Dependent Claim
19 words
A thermoplastic, multilayer structure according to claim 1 wherein said first sheet comprises about 15-60% of said filler material.
Claim 10
Dependent Claim
23 words
A thermoplastic, multilayer structure according to claim 1 wherein said first sheet comprises about 40% talc and at least about 53% polypropylene homopolymer.
Claim 11
Dependent Claim
16 words
A thermoplastic, multilayer structure according to claim 9 wherein said oriented polyolefin comprises biaxially oriented polypropylene.
Claim 12
Dependent Claim
58 words
A thermoplastic, multilayer structure comprising: a first extruded sheet capable of thermoforming into end products which comprises: a first polyolefin; and at least a film comprising a polymer selected from the group consisting of an oriented, second polyolefin different from said first polyolefin and an oriented polyester, joined to said first sheet whereby sagging is prevented upon thermoforming.
Claim 13
Dependent Claim
58 words
A thermoplastic, multilayer structure comprising: a first extruded sheet capable of thermoforming into end products which comprises: a first polyolefin; and at least a film comprising a polymer selected from the group consisting of an oriented, second polyolefin different from said first polyolefin and an oriented polyester, joined to said first sheet whereby sagging is prevented upon thermoforming.
Claim 14
Dependent Claim
18 words
A thermoplastic, multilayer structure according to claim 11 wherein said first sheet comprises an inert, inorganic filler material.
Claim 15
Dependent Claim
28 words
A thermoplastic, multilayer structure according to claim 12 wherein said filler material is selected from the group consisting of talc, calcium carbonate, dolomite, kaolin, gypsum, and mixtures thereof.
Claim 16
Dependent Claim
19 words
A thermoplastic, multilayer structure according to claim 12 wherein said first sheet comprises about 15-60% of said filler material.
Claim 17
Dependent Claim
23 words
A thermoplastic, multilayer structure according to claim 12 wherein said first sheet comprises about 40% talc and at least about 53% polypropylene homopolymer.
Claim 18
Dependent Claim
17 words
A thermoplastic, multilayer structure according to claim 15 wherein said oriented, second polyolefin comprises biaxially oriented polypropylene.
Claim 19
Dependent Claim
14 words
A thermoplastic, multilayer structure according to claim 11 wherein said structure is substantially laminar.
Claim 20
Dependent Claim
27 words
A thermoplastic, multilayer structure according to claim 17 wherein said film consists essentially of said oriented, second polyolefin and said film is laminated to said first sheet.
Claim 21
Dependent Claim
15 words
A thermoplastic, multilayer structure according to claim 11 wherein said first polyolefin comprises polypropylene homopolymer.
Claim 22
Dependent Claim
16 words
A thermoplastic, multilayer structure according to claim 19 wherein said oriented polyolefin comprises biaxially oriented polypropylene.
Claim 23
Dependent Claim
16 words
A thermoplastic, multilayer structure according to claim 11 wherein said oriented polyolefin comprises biaxially oriented polypropylene.
Claim 24
Independent Claim
55 words
A method of forming a multilayer structure comprising: forming a first extruded sheet capable of thermoforming into end products which comprises: a first polyolefin and an inert, inorganic filler material; forming a film comprising a polymer selected from the group consisting of oriented polyolefins and oriented polyesters; and attaching said first sheet to said film.
Claim 25
Independent Claim
55 words
A method of forming a multilayer structure comprising: forming a first extruded sheet capable of thermoforming into end products which comprises: a first polyolefin and an inert, inorganic filler material; forming a film comprising a polymer selected from the group consisting of oriented polyolefins and oriented polyesters; and attaching said first sheet to said film.
Claim 26
Dependent Claim
11 words
A method according to claim 22 wherein said structure is laminar.
Claim 27
Dependent Claim
25 words
A method according to claim 23 wherein said film consists essentially of said oriented, second polyolefin and said film is laminated to said first sheet.
Claim 28
Dependent Claim
26 words
A method according to claim 22 wherein said filler material is selected from the group consisting of talc, calcium carbonate, dolomite, kaolin, gypsum, or mixtures thereof.
Claim 29
Dependent Claim
13 words
A method according to claim 22 wherein said first polyolefin comprises polypropylene homopolymer.
Claim 30
Dependent Claim
15 words
A method according to claim 26 wherein said oriented, second polyolefin comprises biaxially oriented polypropylene.
Claim 31
Dependent Claim
15 words
A method according to claim 22 wherein said oriented, second polyolefin comprises biaxially oriented polypropylene.
Claim 32
Dependent Claim
17 words
A method according to claim 22 wherein said first sheet comprises about 15-60% of said filler material.
Claim 33
Dependent Claim
22 words
A method structure according to claim 22 wherein said first sheet comprises about 40% talc and at least about 53% polypropylene homopolymer.
Claim 34
Dependent Claim
15 words
A method according to claim 30 wherein said oriented, second polyolefin comprises biaxially oriented polypropylene.
Claim 35
Dependent Claim
24 words
A method according to claim 22 wherein said sheet has a width greater than 24 inches and a thickness of at least 20 mils.
Claim 36
Dependent Claim
24 words
The method according to claim 22 wherein said sheet has a width greater than 45 inches and a thickness of at least 20 mils.
Claim 37
Dependent Claim
23 words
A thermoplastic, multilayer structure according to claim 1, wherein said first extruded sheet has a thickness from about 1 to about 50 mils.
Claim 38
Dependent Claim
20 words
A thermoplastic, multilayer structure according to claim 34, wherein said first extruded sheet has a thickness of about 25 mils.
Claim 39
Dependent Claim
21 words
A thermoplastic, multilayer structure according to claim 1, wherein said film has a thickness from about 0.5 to about 2.5 mils.
Claim 40
Dependent Claim
21 words
A thermoplastic, multilayer structure according to claim 36, wherein said film has a thickness from about 1 to about 2 mils.
Claim 41
Dependent Claim
57 words
A thermoplastic, multilayer structure comprising: a first extruded, nonoriented sheet capable of thermoforming into end products which comprises a first polyolefin and an inert, inorganic filler material; and at least a film comprising a polymer selected from the group consisting of oriented polyolefins and oriented polyesters, joined to said first sheet whereby sagging is prevented upon thermoforming.
Claim 42
Dependent Claim
57 words
A thermoplastic, multilayer structure comprising: a first extruded, nonoriented sheet capable of thermoforming into end products which comprises a first polyolefin and an inert, inorganic filler material; and at least a film comprising a polymer selected from the group consisting of oriented polyolefins and oriented polyesters, joined to said first sheet whereby sagging is prevented upon thermoforming.
Claim 43
Dependent Claim
59 words
A thermoplastic, multilayer structure comprising: a first extruded, nonoriented sheet capable of thermoforming into end products which comprises a first polyolefin; and at least a film comprising a polymer selected from the group consisting of an oriented, second polyolefin different from said first polyolefin and an oriented polyester, joined to said first sheet whereby sagging is prevented upon thermoforming.
Claim 44
Dependent Claim
59 words
A thermoplastic, multilayer structure comprising: a first extruded, nonoriented sheet capable of thermoforming into end products which comprises a first polyolefin; and at least a film comprising a polymer selected from the group consisting of an oriented, second polyolefin different from said first polyolefin and an oriented polyester, joined to said first sheet whereby sagging is prevented upon thermoforming.
Claim 45
Independent Claim
56 words
A method of forming a multilayer structure comprising: forming a first extruded, nonoriented sheet capable of thermoforming into end products which comprises: a first polyolefin and an inert, inorganic filler material; forming a film comprising a polymer selected from the group consisting of oriented polyolefins and oriented polyesters; and attaching said first sheet to said film.
Claim 46
Independent Claim
56 words
A method of forming a multilayer structure comprising: forming a first extruded, nonoriented sheet capable of thermoforming into end products which comprises: a first polyolefin and an inert, inorganic filler material; forming a film comprising a polymer selected from the group consisting of oriented polyolefins and oriented polyesters; and attaching said first sheet to said film.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1996-04-19 | 1996-10-19 | 1997-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-04-19 | 2000-10-19 | 2001-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-04-19 | 2004-10-19 | 2005-04-20 | $7700.00 | Window Closed / Lapsed |