Patent US4555533A successfully refreshed from Google Patents.
US4555533A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bonding assistant for a support material
Assignee: Preh GmbH
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Filing: 1981-07-17
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Granted: 1985-11-26
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Expires: 2001-07-17
Abstract
Abstract A bonding assistant for a support material consists of an organic binder ch comprises a mixture of a saturated polyester and an isophorone diisocyanate containing masked isocyanate groups apart from OH groups, said mixture being present in a proportion of from 50 to 80 percent by weight of the total mixture, the binder having filler particles of a particle size less than 15 μm dispersed therein in a proportion of from 10 to 50 percent by weight.
Inventors
- 👤 Peter Ambros
- 👤 Erich Gatzke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:57
CPC Classifications
C; C09; C09J; C09J175/00; C09J175/04; C09J175/06; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/10; C08G18/70; C08G18/72; C08G18/74; C08G18/75; C08G18/751; C08G18/752; C08G18/757; C08K; C08K3/00; C08K3/01; C08K3/013; C08L; C08L33/00; C08L33/04; C08L33/06; C08L61/00; C08L61/20; C08L61/26; C08L61/28; C08L63/00; C08L67/00; C08L67/08; C08L75/00; C08L75/04; C08L75/06; C08L2666/00; C08L2666/02; C08L2666/54
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
102 words
A bonding assistant for use in a printed circuit, which consists essentially of a composition containing: (a) from 50 to 80 percent by weight of a mixture of a saturated polyester and an isophorone diisocyanate containing masked isocyanate groups; (b) from 5 to 40 percent by weight of a mixture of epoxy resin ester and/or acrylic resin and/or melamine formaldehyde resin and/or an alkyd resin; and (c) from 10 to 50 percent by weight of filler particles of a particle size less than 15 μm dispersed therein; in which the composition is curable at a temperature of from 180° to 250° C.
Claim 2
Dependent Claim
102 words
A bonding assistant for use in a printed circuit, which consists essentially of a composition containing: (a) from 50 to 80 percent by weight of a mixture of a saturated polyester and an isophorone diisocyanate containing masked isocyanate groups; (b) from 5 to 40 percent by weight of a mixture of epoxy resin ester and/or acrylic resin and/or melamine formaldehyde resin and/or an alkyd resin; and (c) from 10 to 50 percent by weight of filler particles of a particle size less than 15 μm dispersed therein; in which the composition is curable at a temperature of from 180° to 250° C.
Claim 3
Dependent Claim
35 words
The bonding assistant according to claim 1 characterized in that the filler particles selected from the group consisting of alumina, beryllia, titanium dioxide, talcum, silicon dioxide, zinc oxide, colloidal silica, barium sulfate and/or mixtures thereof.
Claim 4
Dependent Claim
30 words
The bonding assistant claim 1 characterized in that the mixture additionally contains an admixture of antisettling and levelling agent in a proportion of from 1 to 5 percent by weight.
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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) | 1988-11-25 | 1989-05-27 | 1989-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-11-25 | 1993-05-27 | 1993-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-11-25 | 1997-05-27 | 1997-11-26 | $7700.00 | Window Closed / Lapsed |