US5428209A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microwave-active tape having a cured polyolefin pressure-sensitive adhesive layer
Assignee: 3M Co
•
Filing: 1993-12-07
•
Granted: 1995-06-27
•
Expires: 2013-12-07
Abstract
Abstract A piece of microwave-active tape which is odor-free and physiologically inert can be adhered to a food package and remains strongly adhered during cooking at temperatures of at least 200° C. The tape has layers of microwave-active material and a pressure-sensitive adhesive which is a polymeric α-olefin that has been cured to afford a "Peel Value" of at least 5 N/dm and a "Shrink Back" at 220° C. of less than 5%. The tape can have a flexible backing such as a low-adhesion carrier web which can be stripped off from a piece of the tape that has been applied to a microwave food package, or when the backing is heat-resistant, it can be left in place.
Inventors
- 👤 Gaddam N. Babu
- 👤 Susan S. Christopher
- 👤 Pierre H. LePere
- 👤 James R. Peterson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:38
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02; C08L23/18; C08L23/20; B; B65; B65D; B65D81/00; B65D81/34; B65D81/3446; C09; C09J; C09J7/00; C09J7/20; C09J7/29; C09J7/30; C09J7/38; C09J7/381; B65D2581/00; B65D2581/34; B65D2581/3437; B65D2581/3439; B65D2581/3445; B65D2581/3463; B65D2581/3466; B65D2581/3471; B65D2581/3472; B65D2581/3477; B65D2581/3478; B65D2581/3486; B65D2581/3494; C09J2301/00; C09J2301/10; C09J2301/16; C09J2301/162; C09J2400/00; C09J2400/10; C09J2400/16; C09J2400/163; C09J2423/00; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24479; Y10T428/28; Y10T428/2852; Y10T428/2878
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
42 words
A microwave-active tape comprising a layer of pressure sensitive adhesive (PSA), wherein said PSA comprises a cured polymeric poly α-olefin and has a "Peel" value of at least 5 N/dm and a "Shrink Back" value at 220° C. of less than 5%.
Claim 2
Dependent Claim
42 words
A microwave-active tape comprising a layer of pressure sensitive adhesive (PSA), wherein said PSA comprises a cured polymeric poly α-olefin and has a "Peel" value of at least 5 N/dm and a "Shrink Back" value at 220° C. of less than 5%.
Claim 3
Independent Claim
127 words
A method of selectively heating and browning food comprising the steps of (1) positioning a first piece of microwave-active tape comprising layers of (a) an oriented backing material, (b) a microwave-active material, and (c) a pressure-sensitive adhesive, wherein said pressure sensitive adhesive comprises a cured polymeric poly α-olefin and has a "Peel" value of at least 5 N/dm and a "Shrink Back" value at 220° C. of less than 5% adjacent to a first portion of food requiring browning and (2) positioning a second piece of microwave-active tape adjacent to a second portion of food requiring less cooking time than said first portion of food, wherein said first piece of microwave-active tape is a microwave susceptor and said second piece of microwave-active tape is a microwave shield.
Claim 4
Independent Claim
127 words
A method of selectively heating and browning food comprising the steps of (1) positioning a first piece of microwave-active tape comprising layers of (a) an oriented backing material, (b) a microwave-active material, and (c) a pressure-sensitive adhesive, wherein said pressure sensitive adhesive comprises a cured polymeric poly α-olefin and has a "Peel" value of at least 5 N/dm and a "Shrink Back" value at 220° C. of less than 5% adjacent to a first portion of food requiring browning and (2) positioning a second piece of microwave-active tape adjacent to a second portion of food requiring less cooking time than said first portion of food, wherein said first piece of microwave-active tape is a microwave susceptor and said second piece of microwave-active tape is a microwave shield.
Claim 5
Independent Claim
119 words
A method of steam venting an air-tight polymer food container comprising (1) positioning a piece of microwave-active tape on the outside surface of the air-tight polymer food container, wherein the microwave active tape is a susceptor and comprises layers of (a) an oriented backing material, (b) a microwave active material, and (c) a pressure-sensitive adhesive, wherein said pressure sensitive adhesive comprises a cured polymeric poly α-olefin and has a "Peel" value of at least 5 N/dm and a "Shrink Back" value at 220° C. of less than 5% and (2) heating the air-tight polymer food container such that vapor generated within the food container perforates the outside surface of the food container and vents through the microwave active tape.
Claim 6
Independent Claim
119 words
A method of steam venting an air-tight polymer food container comprising (1) positioning a piece of microwave-active tape on the outside surface of the air-tight polymer food container, wherein the microwave active tape is a susceptor and comprises layers of (a) an oriented backing material, (b) a microwave active material, and (c) a pressure-sensitive adhesive, wherein said pressure sensitive adhesive comprises a cured polymeric poly α-olefin and has a "Peel" value of at least 5 N/dm and a "Shrink Back" value at 220° C. of less than 5% and (2) heating the air-tight polymer food container such that vapor generated within the food container perforates the outside surface of the food container and vents through the microwave active tape.
References Cited (Backward Citations)
US4102835A
Cited
US4015085A
Cited
US4022728A
Cited
US4190757A
Cited
US4267420A
Cited
US4230924A
Cited
US4641005A
Cited
US4357383A
Cited
US4398077A
Cited
US4394917A
Cited
US4574174A
Cited
US4640838A
Cited
US4661672A
Cited
US4735513A
Cited
US4708249A
Cited
US4664263A
Cited
US4873101A
Cited
US4865854A
Cited
US4703148A
Cited
US5041325A
Cited
US4962000A
Cited
US4933193A
Cited
US4911960A
Cited
US4925684A
Cited
US4911938A
Cited
US4870233A
Cited
US5014852A
Cited
US5013795A
Cited
US5156911A
Cited
US4931327A
Cited
US5045999A
Cited
US5112882A
Cited
US5038009A
Cited
US5194501A
Cited
US5298708A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-06-26 | 1998-12-26 | 1999-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-06-26 | 2002-12-26 | 2003-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-06-26 | 2006-12-26 | 2007-06-27 | $7700.00 | Window Closed / Lapsed |