US4412048A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solventless UV dryable B-stageable epoxy adhesive
Assignee: Westinghouse Electric Corp
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Filing: 1981-09-11
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Granted: 1983-10-25
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Expires: 2001-09-11
Abstract
Abstract Disclosed is a solventless UV dryable B-stageable epoxy adhesive which comprises about 40 to about 70 pbw of a solid thermally curable epoxy having a molecular weight between about 650 and about 4000, a thermal curing agent for the thermally curable epoxy which is stable at room temperature and soluble on the adhesive in an amount of about stoichiometric to about 50% by weight in excess of stoichiometric, up to about 2 pbw of an accelerator for the thermal curing agent which is soluble in the adhesive, about 25 to about 60 pbw of a liquid UV curable resin having a molecular weight of less than about 700 which is either an epoxy, an acrylic, or a mixture thereof and which is a diluent for the thermally curable epoxy, about 1 to about 10 pbw of a UV photoinitiator for the UV curable resin, up to about 20 pbw of a reactive diluent, up to about 5 pbw of a flow control agent, up to about 1 pbw of a surfactant, and up to about 10 pbw of a tri or higher functional epoxy.
Inventors
- 👤 George D. Dixon
- 👤 Nancy W. Carlson
- 👤 Howard E. Saunders
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:51
CPC Classifications
C; C09; C09J; C09J163/00; C08; C08G; C08G59/00; C08G59/18; C08J; C08J3/00; C08J3/28; C08L; C08L2666/00; C08L2666/02; C08L2666/28; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31511; Y10T428/31515
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
168 words
A solventless, UV-dryable, B-stageable, epoxy adhesive comprising: (A) about 40 to about 70 pbw of a solid thermally curable epoxy having a molecular weight between about 650 to about 4,000; (B) a thermal curing agent for said thermally curable epoxy, stable at room temperature and soluble in said adhesive, in an amount from about stoichiometric to about 50% by weight in excess of stoichiometric; (C) up to about 2 pbw of an accelerator for said thermal curing agent, soluble in said adhesive; (D) about 25 to about 60 pbw of a liquid UV curable epoxy resin in which said solid thermally curable epoxy is soluble; (E) about 1 to about 10 pbw of a UV photoinitiator for said UV curable epoxy resin; and (F) up to about 20 pbw of a reactive diluent; (G) up to about 5 pbw of a flow control agent; (H) up to about 1 pbw of a surfactant; and (I) about 2 to about 10 pbw of a tri or higher functional epoxy.
Claim 2
Dependent Claim
168 words
A solventless, UV-dryable, B-stageable, epoxy adhesive comprising: (A) about 40 to about 70 pbw of a solid thermally curable epoxy having a molecular weight between about 650 to about 4,000; (B) a thermal curing agent for said thermally curable epoxy, stable at room temperature and soluble in said adhesive, in an amount from about stoichiometric to about 50% by weight in excess of stoichiometric; (C) up to about 2 pbw of an accelerator for said thermal curing agent, soluble in said adhesive; (D) about 25 to about 60 pbw of a liquid UV curable epoxy resin in which said solid thermally curable epoxy is soluble; (E) about 1 to about 10 pbw of a UV photoinitiator for said UV curable epoxy resin; and (F) up to about 20 pbw of a reactive diluent; (G) up to about 5 pbw of a flow control agent; (H) up to about 1 pbw of a surfactant; and (I) about 2 to about 10 pbw of a tri or higher functional epoxy.
Claim 3
Dependent Claim
82 words
An adhesive according to claim 1 wherein the amount of said thermally curable epoxy is about 45 pbw to about 60 pbw, the amount of said thermal curing agent is about stoichiometric up to about 20% in excess of stoichiometric, the amount of said liquid UV curable epoxy resin is about 30 to about 60 pbw, the amount of said UV photoinitiator is about 3 to about 5 pbw of a compound which generates Lewis acid, a Bronsted acid or mixture thereof.
Claim 4
Dependent Claim
65 words
An adhesive according to claim 1 wherein said reactive diluent, if present, is present at about 5 to about 10 pbw, said flow control agent, if present, is present at about 0.5 to about 2 pbw, said surfactant, if present, is present at about 0.1 to about 0.5 pbw and said tri or higher functional epoxy is present at about 2 to about 5 pbw.
Claim 5
Dependent Claim
15 words
An adhesive according to claim 1 wherein said UV curable resin is a cycloaliphatic epoxy.
Claim 6
Dependent Claim
13 words
An adhesive according to claim 4 wherein said cycloaliphatic epoxy is limonene dioxide.
Claim 7
Dependent Claim
15 words
An adhesive according to claim 1 wherein said thermally curable epoxy is a bisphenol-A epoxy.
Claim 8
Dependent Claim
14 words
An adhesive according to claim 1 wherein said thermal curing agent is an anhydride.
Claim 9
Dependent Claim
26 words
An adhesive according to claim 7 wherein said anhydride is a methyl tetrahydrophthalic anhydride and is used in combination with an accelerator of chromium acetyl acetonate.
Claim 10
Dependent Claim
14 words
An adhesive according to claim 1 wherein said UV initiator is an iodonium salt.
Claim 11
Dependent Claim
21 words
An adhesive according to claim 1 wherein said thermally curable epoxy has a molecular weight of about 900 to about 1500.
Claim 12
Dependent Claim
51 words
An adhesive according to claim 1 prepared by dissolving said thermally curable epoxy in said UV curable epoxy resin at a temperature of less than 120° C., cooling to less than 80° C., adding said curing agent and said accelerator, cooling to less than 40° C., and adding any remaining ingredients.
Claim 13
Dependent Claim
17 words
A substrate coated with an adhesive according to claim 1 which has been cured to the B-stage.
Claim 14
Dependent Claim
13 words
A substrate according to claim 12 wherein said substrate is treated kraft paper.
Claim 15
Dependent Claim
14 words
A substrate according to claim 12 wherein said adhesive has been cured with heat.
Claim 16
Dependent Claim
18 words
An adhesive according to claim 1 wherein said tri or higher functional epoxy is a liquid aliphatic epoxy.
Claim 17
Dependent Claim
19 words
A substrate according to claim 12 wherein said adhesive is cured and binds a second substrate to said substrate.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-10-24 | 1987-04-25 | 1987-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-24 | 1991-04-25 | 1991-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-24 | 1995-04-25 | 1995-10-25 | $7700.00 | Window Closed / Lapsed |