US4221840A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adhesive
Assignee: Ranbar Electrical Materials Inc
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Filing: 1978-02-10
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Granted: 1980-09-09
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Expires: 1998-02-10
Abstract
Abstract An adhesive composition free of free-radical catalysts is disclosed comprising hydroxy terminated 1,2-polybutadiene, a diisocyanate, and either styrene, vinyl toluene, or a mixture thereof. The adhesive composition is A-staged whence a free-radical catalyst is added. A material such as a film or fibrous reinforcement is coated with the composition and the composition is B-staged. The coated material can be cured during lamination with copper in a heated nip roll.
Inventors
- 👤 William M. Alvino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:49
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/67; C08G18/69; C08F; C08F283/00; C09; C09J; C09J175/00; C09J175/04; C09J175/14; H; H05; H05K; H05K3/00; H05K3/38; H05K3/386; H05K2201/00; H05K2201/01; H05K2201/0104; H05K2201/0133; H05K2201/03; H05K2201/0332; H05K2201/0335; H05K2201/0355; Y; Y10; Y10S; Y10S525/00; Y10S525/92; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31551; Y10T428/31562; Y10T428/31721
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
148 words
An A-staged reaction product made by reacting to the A-stage by heating at about 60° C. for about 1/2 to about 1 hour followed by heating at about 120° C. until the viscosity is less than 8 secons measured in a 62 mm×4 mm I.D. flow tube at 120° C., (A) hydroxy terminated 1,2-polybutadiene; and (B) about a stoichiometric equivalent to react with the hydroxy functionality of said hydroxy terminated 1,2-polybutadiene up to about 20 meq in excess of said stoichiometric equivalent, of a diisocyanate having the general formula OCH--R--NCO where R is a divalent aromatic or aliphatic radical; and (C) a vinyl compound selected from the group consisting of styrene, vinyl toluene, and mixtures thereof in a ratio of about 1.0 to about 2 parts by weight per each part by weight of said hydroxy terminated 1,2-polybutadiene, said A-staged reaction product being free of any free-radical catalyst.
Claim 2
Dependent Claim
148 words
An A-staged reaction product made by reacting to the A-stage by heating at about 60° C. for about 1/2 to about 1 hour followed by heating at about 120° C. until the viscosity is less than 8 secons measured in a 62 mm×4 mm I.D. flow tube at 120° C., (A) hydroxy terminated 1,2-polybutadiene; and (B) about a stoichiometric equivalent to react with the hydroxy functionality of said hydroxy terminated 1,2-polybutadiene up to about 20 meq in excess of said stoichiometric equivalent, of a diisocyanate having the general formula OCH--R--NCO where R is a divalent aromatic or aliphatic radical; and (C) a vinyl compound selected from the group consisting of styrene, vinyl toluene, and mixtures thereof in a ratio of about 1.0 to about 2 parts by weight per each part by weight of said hydroxy terminated 1,2-polybutadiene, said A-staged reaction product being free of any free-radical catalyst.
Claim 3
Dependent Claim
16 words
A reaction product according to claim 1 wherein the amount of said diisocyanate is about stoichiometric.
Claim 4
Dependent Claim
23 words
A reaction product according to claim 1 wherein the weight ratio of said vinyl compound to said hydroxy terminated 1,2-polybutadiene is about 1.5.
Claim 5
Dependent Claim
28 words
A reaction product according to claim 1 wherein said diisocyanate is selected from the group consisting of toluene diisocyanate, 4,4'-diisocyanato diphenyl ether, diphenyl methane diisocyanate, and mixtures thereof.
Claim 6
Dependent Claim
14 words
A reaction product according to claim 4 wherein said diisocyanate is diphenyl methane diisocyanate.
Claim 7
Dependent Claim
13 words
A reaction product according to claim 1 wherein said vinyl compound is styrene.
Claim 8
Dependent Claim
21 words
A reaction product according to claim 1 which includes about 0.5 to about 1.5% by weight of a non-free radical catalyst.
Claim 9
Dependent Claim
23 words
A reaction product according to claim 1 which includes about 60 to about 81% by weight based on solids of a fire retardant.
Claim 10
Dependent Claim
38 words
A reaction product to claim 1 wherein said fire retardant is about 20 to about 40% by weight based on solids of antimony trioxide and about 30 to about 50% by weight based on solids of decabromo diphenyloxide.
Claim 11
Dependent Claim
20 words
A reaction product according to claim 1 including about 1 to about 6% by weight of a free radical catalyst.
Claim 12
Dependent Claim
13 words
A composition according to claim 10 wherein said free-radical catalyst is t-butyl perbenzoate.
Claim 13
Dependent Claim
11 words
A reaction product according to claim 10 which has been B-staged.
Claim 14
Dependent Claim
16 words
An article made by coating a material with an A-staged reaction product according to claim 10.
Claim 15
Dependent Claim
13 words
An article according to claim 13 wherein said material is a fibrous reinforcement.
Claim 16
Dependent Claim
12 words
An article according to claim 13 wherein said coated material is B-staged.
Claim 17
Dependent Claim
11 words
An article according to claim 15 wherein said composition is cured.
Claim 18
Dependent Claim
48 words
A method of preparing an adhesive material comprising: (A) adding about 1 to about 6% by weight of a free-radical catalyst to a reaction product according to claim 1; (B) coating a material with said reaction product; and (C) heating said coated material to B-stage said reaction product.
Claim 19
Dependent Claim
16 words
A method according to claim 17 including the additional last step of postcuring said reaction product.
Claim 20
Dependent Claim
13 words
A method according to claim 17 wherein said free-radical catalyst is t-butyl perbenzoate.
Claim 21
Dependent Claim
31 words
A method according to claim 17 wherein said material is a fibrous reinforcement, including the additional last step of laminating said coated material between copper sheets in a heated nip roll.
Claim 22
Dependent Claim
12 words
An article according to claim 13 wherein said material is polyimide film.
Claim 23
Dependent Claim
19 words
An article according to claim 21 wherein said A-staged reaction product is sandwiched between two layers of polyimide film.
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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) | 1983-09-09 | 1984-03-10 | 1984-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-09 | 1988-03-10 | 1988-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-09 | 1992-03-10 | 1992-09-09 | $7700.00 | Window Closed / Lapsed |