US3962520A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adhesive composition for flexible printed circuit and method for using the same
Assignee: Sumitomo Bakelite Co Ltd
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Filing: 1974-12-09
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Granted: 1976-06-08
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Expires: 1994-12-09
Abstract
Abstract As an adhesive used for a laminate for a flexible printed circuit, there is provided an adhesive composition comprising as the essential components a polyester resin, an isocyanate compound, and a B-stage epoxy resin. This composition is excellent in flow property and rapid curability and is suitable for use in a continuous adhesion between a plastic insulating film and a conductive foil by means of a roll-laminator and it affords an excellent characteristic to the laminate a printed circuit. There is also provided an adhesive composition which contains, in addition to the above ingredients, a styrene copolymer comprising maleic anhydride, or an alkyl maleate as a structural unit, or a metallic salt of an aliphatic carboxylic acid in order to prevent blocking and promote curing of the adhesive in a roll laminating process. The addition of a small amount of a pigment results in an adhesive composition which is effective in the economical production of a laminate for a colored flexible printed circuit, and which has the effect of preventing the blocking and improving the weather resistance of the adhesive.
Inventors
- 👤 Tsutomu Watanabe
- 👤 Shigenori Yamaoka
- 👤 Koichi Tanaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:25
CPC Classifications
H; H05; H05K; H05K3/00; H05K3/38; H05K3/386; C; C08; C08L; C08L63/00; C09; C09J; C09J175/00; C09J175/04; C09J175/06; H05K1/00; H05K1/02; H05K1/03; H05K1/0393; H05K2201/00; H05K2201/01; H05K2201/0137; H05K2201/0145; H05K2201/03; H05K2201/0332; H05K2201/0335; H05K2201/0355; Y; Y10; Y10S; Y10S428/00; Y10S428/901; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31511; Y10T428/31515; Y10T428/31522; Y10T428/31551; Y10T428/31562; Y10T428/31565; Y10T428/31573; Y10T428/3158; Y10T428/31587; Y10T428/31598; Y10T428/31601; Y10T428/31786; Y10T428/31794
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
101 words
A process for producing a metal-clad laminate for a flexible printed circuit which comprises heat-pressing together a plastic film and a metal foil having an adhesive composition therebetween to cure the adhesive and bond the plastic film and metal foil, the adhesive composition comprising a mixture of 100 parts by weight of a polyester resin, 1 to 20 parts by weight of an isocyanate compound and 2 to 50 parts by weight of a B-stage epoxy resin obtained by reacting a compound containing at least two epoxy groups in the molecule with a compound having at least two active hydrogen atoms.
Claim 2
Dependent Claim
101 words
A process for producing a metal-clad laminate for a flexible printed circuit which comprises heat-pressing together a plastic film and a metal foil having an adhesive composition therebetween to cure the adhesive and bond the plastic film and metal foil, the adhesive composition comprising a mixture of 100 parts by weight of a polyester resin, 1 to 20 parts by weight of an isocyanate compound and 2 to 50 parts by weight of a B-stage epoxy resin obtained by reacting a compound containing at least two epoxy groups in the molecule with a compound having at least two active hydrogen atoms.
Claim 3
Dependent Claim
78 words
A process for producing a metal-clad laminate for a flexible printed circuit in accordance with claim 1 wherein said adhesive composition further comprises 0.5 to 20 parts by weight of at least one copolymer selected from the group consisting of a copolymer of aromatic vinyl compound with maleic anhydride, an alkyl ester of said copolymer, a copolymer of aromatic vinyl compound with an alkyl maleate, and a copolymer of aromatic vinyl compound with maleic anhydride and alkyl maleate.
Claim 4
Dependent Claim
37 words
A process for producing a metal-clad laminate for a flexible printed circuit in accordance with claim 1 wherein said composition further comprises 0.01 to 5 parts by weight of a metallic salt of an aliphatic carboxylic acid.
Claim 5
Dependent Claim
41 words
A process for producing a metal-clad laminate for a flexible printed circuit in accordance with claim 1 wherein the adhesive composition further comprises 0.5 to 15 parts by weight of a pigment having a particle size of up to 10 μ.
Claim 6
Dependent Claim
41 words
A process for producing a metal-clad laminate for a flexible printed circuit in accordance with claim 2 wherein the adhesive composition further comprises 0.5 to 15 parts by weight of a pigment having a particle size of up to 10 μ.
Claim 7
Dependent Claim
41 words
A process for producing a metal-clad laminate for a flexible printed circuit in accordance with claim 3 wherein the adhesive composition further comprises 0.5 to 15 parts by weight of a pigment having a particle size of up to 10 μ.
Claim 8
Dependent Claim
32 words
A process according to claim 1, wherein the plastic film is selected from the group consisting of a polyethylene terephthalate film, a polyethylene-2,6-naphthalate film, and a polyvinyl chloride film, a polyamide film.
Claim 9
Dependent Claim
20 words
A process according to claim 2, wherein the plastic film is a polyethylene terephthalate film or a polyethylene-2, 6-naphthalate film.
Claim 10
Dependent Claim
127 words
A process for producing a metal-clad laminate for a flexible printed circuit in accordance with claim 1 which comprises adhering said plastic film to said metal foil by applying said adhesive composition to said plastic film and/or said metal foil; passing said plastic film and said metal foil through the nip of a pair of two hot rolls which consist of a metal roll and a rubber roll in the manner that said plastic film is contacted with the metal roll and said metal foil is allowed to wrap around the rubber roll from the position on the circumference of the roll for π/4 or more radians toward the contact line of the two rolls; and heat-pressing said plastic film and metal foil to form a laminate.
Claim 11
Dependent Claim
67 words
A process according to claim 9, wherein the adhesive composition further comprises 0.5 to 20 parts by weight of at least one copolymer selected from the group consisting of a copolymer of aromatic vinyl compound with maleic anhydride, an alkyl ester of said copolymer, a copolymer of aromatic vinyl compound with an alkyl maleate, and a copolymer of aromatic vinyl compound with maleic anhydride and alkyl maleate.
Claim 12
Dependent Claim
27 words
A process according to claim 9, wherein the adhesive composition further comprises 0.01 to 5 parts by weight of a metallic salt of an aliphatic carboxylic acid.
Claim 13
Dependent Claim
30 words
A process according to claim 9, wherein the adhesive composition further comprises 0.5 to 15 parts by weight of a pigment having a particle size of up to 10 μ.
Claim 14
Dependent Claim
13 words
A metal-clad laminate for a flexible printed circuit prepared according to claim 1.
Claim 15
Dependent Claim
13 words
A metal-clad laminate for a flexible printed circuit prepared according to claim 2.
Claim 16
Dependent Claim
13 words
A metal-clad laminate for a flexible printed circuit prepared according to claim 3.
Claim 17
Dependent Claim
13 words
A metal-clad laminate for a flexible printed circuit prepared according to claim 4.
Claim 18
Dependent Claim
13 words
A metal-clad laminate for a flexible printed circuit prepared according to claim 5.
Claim 19
Dependent Claim
13 words
A metal-clad laminate for a flexible printed circuit prepared according to claim 6.
Claim 20
Dependent Claim
13 words
A metal-clad laminate for a flexible printed circuit prepared according to claim 7.
Claim 21
Dependent Claim
13 words
A metal-clad laminate for a flexible printed circuit prepared according to claim 8.
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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) | 1979-06-08 | 1979-12-08 | 1980-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-08 | 1983-12-08 | 1984-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-08 | 1987-12-08 | 1988-06-08 | $7700.00 | Window Closed / Lapsed |