Patent US4354012A successfully refreshed from Google Patents.
US4354012A
Expired / Lapsed
US
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Aliphatic diene bis-imide polymers
Assignee: RTX Corp
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Filing: 1981-06-12
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Granted: 1982-10-12
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Expires: 2001-06-12
Abstract
Abstract A moisture resistant polyimide adhesive is disclosed comprising a polymer having repeating units of the formula: ##STR1## where n is equal to about 8 to about 20. The improved moisture resistance of the polymers according to the present invention is indicated by a moisture pick-up of less than about 0.6% by weight after 24 hour immersion in room temperature water. The polymer also exhibits a tensile strength greater than about 1800 psi (1.24×10 7 NT/M 2 ). In addition to their improved adhesive and moisture resistant properties, the polymers according to the present invention exhibited such properties with cure times of less than about one hour at temperatures up to about 320° C.
Inventors
- 👤 Daniel A. Scola
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:55
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/12; C08G73/121; C08F; C08F22/00; C08F22/36; C08F22/40
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
80 words
A moisture resistant polyimide adhesive formed by polymerizing monomers of the formula: ##STR6## to form a polymer with repeating units ##STR7## where n is aobut 8 to about 20, and the polymer has a room temperature water immersion moisture absorption rate less than about 0.6% by weight for 24 hours and a tensile lap shear strength greater than about 1800 psi (1.24×10 7 NT/M 2 ), such properties imparted to the polymer with curing for less than about one hour.
Claim 2
Dependent Claim
80 words
A moisture resistant polyimide adhesive formed by polymerizing monomers of the formula: ##STR6## to form a polymer with repeating units ##STR7## where n is aobut 8 to about 20, and the polymer has a room temperature water immersion moisture absorption rate less than about 0.6% by weight for 24 hours and a tensile lap shear strength greater than about 1800 psi (1.24×10 7 NT/M 2 ), such properties imparted to the polymer with curing for less than about one hour.
Claim 3
Dependent Claim
13 words
The polyimide of claim 1 where n is about 8 to about 12.
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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) | 1985-10-11 | 1986-04-12 | 1986-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-10-11 | 1990-04-12 | 1990-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-10-11 | 1994-04-12 | 1994-10-12 | $7700.00 | Window Closed / Lapsed |