US4004061A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adhesives
Assignee: Novartis Corp
•
Filing: 1974-01-14
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Granted: 1977-01-18
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Expires: 1994-01-14
Abstract
Abstract Making film adhesives from a thermosettable resin composition presents difficulties if the composition is not soluble in a volatile solvent, or not readily fusible without gelling prematurely, or undergoes undesirable advancement on being subjected to extrusion procedures. Such compositions in the form of solid particles can be made into film adhesives by coating a carrier with a readily-curable thermosettable resin composition, which is preferably tacky, applying the solid particles to the coating, and then curing the coating under conditions such that the particles of thermosettable resin composition remain curable.
Inventors
- 👤 Gordon Robert Creighton
- 👤 Barry James Hayes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:42
CPC Classifications
C; C09; C09J; C09J7/00; C09J7/20; C09J7/10; Y; Y10; Y10T; Y10T428/00; Y10T428/28; Y10T428/2813; Y10T428/2817; Y10T428/2826; Y10T428/2848
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
58 words
A film adhesive which comprises a layer of thermoset resin composition having adhering thereto solid particles of at least 60 μm and at most 1.5 mm of a thermosettable resin composition which is curable at an appreciable rate only at a temperature at least 30° C higher than that at which the thermoset resin composition has been cured.
Claim 2
Dependent Claim
58 words
A film adhesive which comprises a layer of thermoset resin composition having adhering thereto solid particles of at least 60 μm and at most 1.5 mm of a thermosettable resin composition which is curable at an appreciable rate only at a temperature at least 30° C higher than that at which the thermoset resin composition has been cured.
Claim 3
Dependent Claim
16 words
An adhesive according to claim 1, supported on a carrier which is a solid, self-sustaining sheet.
Claim 4
Dependent Claim
33 words
An adhesive according to claim 2, in which the carrier bears on its opposite face a further layer of a thermoset resin composition having adhering thereto solid particles of a thermosettable resin composition.
Claim 5
Dependent Claim
39 words
An adhesive according to claim 1, in which the thermosettable resin composition is curable at an appreciable rate only at a temperature from 50° to 250° C higher than that at which the thermoset resin composition had been cured.
Claim 6
Dependent Claim
18 words
An adhesive according to claim 1, in which the thermoset resin composition had been cured at room temperature.
Claim 7
Dependent Claim
20 words
An adhesive according to claim 1, in which the thermosettable resin composition cures substantially only at temperatures above 70° C.
Claim 8
Dependent Claim
46 words
An adhesive according to claim 1, in which the said thermoset resin composition is a cured liquid thermosettable resin composition, the ratio by weight of the said liquid thermosettable resin composition to the said solid particles of a thermosettable resin composition being from 2:1 to 1:10.
Claim 9
Dependent Claim
31 words
An adhesive according to claim 1 wherein the layer of thermoset resin composition is selected from the group consisting of a polyurethane, a polyester, a phenol-aldehyde resin and an epoxide resin.
Claim 10
Dependent Claim
47 words
An adhesive according to claim 1 wherein the thermosettable resin composition is selected from the group consisting of an epoxide resin in the B-stage, an epoxide resin advanced by reaction with a diol, a phenolic resole in the B-stage and a polyamic acid intermediate of a polyimide.
Claim 11
Dependent Claim
35 words
An adhesive according to claim 2 wherein said carrier is selected from the group consisting of paper, foraminous structures such as textiles of nylon, polyester or glass fiber, polyethylene film, polypropylene film and aluminum foil.
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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) | 1980-01-18 | 1980-07-19 | 1981-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-01-18 | 1984-07-19 | 1985-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-01-18 | 1988-07-19 | 1989-01-18 | $7700.00 | Window Closed / Lapsed |