EP0326516A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Method of making patterns
Assignee: Huntsman Advanced Materials Switzerland GmbH
•
Filing: 1989-01-18
•
Granted: —
•
Expires: 2009-01-18
Abstract
Abstract A method of making a metallic pattern on a substrate having a surface comprising bare metal in predetermined areas and metal coated by a resist in remaining areas comprises (i) protecting the bare metal by electrodepositing thereon a heat-curable polymeric film having (a) a group which is reactive with an isocyanate group and (b) a blocked isocyanate group, (ii) heating the electrodeposited polymeric film to render it resistant to a solvent with which the resist is removable, (iii) removing the resist from said remaining areas using a solvent which does not remove the electrodeposited polymeric film, thereby exposing metal in said remaining areas, and (iv) etching the metal exposed in step (iii) using an etchant which does not remove the electrodeposited polymeric film, thereby leaving a metallic pattern protected by the electrodeposited polymeric film, which can be removed subsequently using a solvent therefor. The method is useful in the production of printed circuits.
Inventors
- 👤 Christopher Paul Dr. Banks
- 👤 Edward Dr. Irving
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 10:18
CPC Classifications
H; H05; H05K; H05K3/00; H05K3/0073; H05K3/0079; C; C23; C23F; C23F1/00; C23F1/02; G; G03; G03F; G03F7/00; G03F7/26; G03F7/40; H05K3/02; H05K3/06; H05K3/061; H05K2203/00; H05K2203/05; H05K2203/0562; H05K2203/0582; H05K2203/07; H05K2203/0779; H05K2203/0783; H05K2203/11; H05K2203/1105; H05K2203/13; H05K2203/1333; H05K2203/135; H05K3/0076
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
135 words
A method of making a metallic pattern on a substrate having a surface comprising bare metal in predetermined areas and metal coated by a resist in remaining areas which comprises (i) protecting the bare metal by electrodepositing thereon a heat-curable polymeric film having (a) a group which is reactive with an isocyanate group and (b) a blocked isocyanate group, (ii) heating the electrodeposited polymeric film to render it resistant to a solvent with which the resist is removable, (iii) removing the resist from said remaining areas using a solvent which does not remove the electrodeposited polymeric film, thereby exposing metal in said remaining areas, and (iv) etching the metal exposed in step (iii) using an etchant which does not remove the electrodeposited polymeric film, thereby leaving a metallic pattern protected by the electrodeposited polymeric film.
Claim 2
Independent Claim
135 words
A method of making a metallic pattern on a substrate having a surface comprising bare metal in predetermined areas and metal coated by a resist in remaining areas which comprises (i) protecting the bare metal by electrodepositing thereon a heat-curable polymeric film having (a) a group which is reactive with an isocyanate group and (b) a blocked isocyanate group, (ii) heating the electrodeposited polymeric film to render it resistant to a solvent with which the resist is removable, (iii) removing the resist from said remaining areas using a solvent which does not remove the electrodeposited polymeric film, thereby exposing metal in said remaining areas, and (iv) etching the metal exposed in step (iii) using an etchant which does not remove the electrodeposited polymeric film, thereby leaving a metallic pattern protected by the electrodeposited polymeric film.
Claim 3
Dependent Claim
63 words
A method according to claim 1, in which the electrodeposited polymeric film comprises a heat-curable polymer having a hydroxyl group and a blocked isocyanate group which is electrodeposited from a composition comprising an electrodepositable heat-curable polymer in an electrodeposition medium, said polymer having a hydroxyl group, a blocked isocyanate group and a salt-forming group which is present at least partially in ionised form.
Claim 4
Dependent Claim
51 words
A method according to claim 2, in which the polymer is a copolymer of at least two vinyl monomers, at least one of the monomers having a hydroxyl group, at least one of the monomers having the blocked isocyanate group and at least one of the monomers having a salt-forming group.
Claim 5
Dependent Claim
30 words
A method according to claim 3, in which the copolymer contains from 0.2 to 5% by weight of units derived from the monomer or monomers containing the blocked isocyanate group.
Claim 6
Dependent Claim
22 words
A method according to claim 3, in which the monomer having a hydroxyl group is a hydroxyalkyl acrylate or a hydroxyalkyl methacrylate.
Claim 7
Dependent Claim
64 words
A method according to claim 3 or 4, in which the monomer having the blocked isocyanate group is a substance having an acrylate or methacrylate group and at least one blocked isocyanate group of formula -NH-CO-X I where X denotes the residue of a compound having an active hydrogen atom, in a group reactive with an isocyanate group, after removal of said hydrogen atom.
Claim 8
Dependent Claim
54 words
A method according to claim 6, in which X denotes the residue of a compound having an isocyanate-reactive group which is an alcoholic or phenolic hydroxyl group, a group =N-OH in an oxime, a mercapto group or a primary or secondary amino group, after removal of an active hydrogen atom from the isocyanate-reactive group.
Claim 9
Dependent Claim
80 words
A method according to claim 6 or 7, in which the monomer having a blocked isocyanate group is a reaction product of a polyisocyanate with a hydroxyl group-containing acrylic material and a compound of formula XH III where X denotes the residue of a compound having an active hydrogen atom, in a group reactive with an isocyanate group, after removal of said hydrogen atom, or a reaction product of an isocyanate group-containing acrylic material with a compound of formula III.
Claim 10
Independent Claim
44 words
A method according to any of claims 3 to 8, in which the copolymer is a copolymer of at least three vinyl monomers and the monomer having a salt-forming group is an acrylic monomer having a tertiary amine group or a vinyl carboxylic acid.
Claim 11
Dependent Claim
68 words
A method according to any of claims 3 to 9, in which the copolymer is a copolymer of a hydroxyalkyl acrylate or hydroxyalkyl methacrylate with a monomer having a blocked isocyanate group as defined in any of claims 6 to 8, a salt-forming group-containing monomer as defined in claim 9 and one or more other vinyl monomers selected from an alkyl acrylate, an alkyl methacrylate or a styrene.
Claim 12
Dependent Claim
79 words
A method according to claim 2, in which the polymer is obtained by first reacting a polyisocyanate with a compound of formula XH III where X denotes the residue of a compound having an active hydrogen atom, in a group reactive with an isocyanate group, after removal of said hydrogen atom, to give an intermediate containing both free and blocked isocyanate groups and then reacting the free isocyanate content of the intermediate with a hydroxyl- and salt-forming group-containing polymer.
Claim 13
Independent Claim
64 words
A method according to any of the preceding claims, in which the electrodeposited polymeric film comprises a mixture of a hydroxyl group-containing polymer and a blocked isocyanate which is electrodeposited from a composition comprising, in an electrodeposition medium, a mixture of a blocked isocyanate and an electrodepositable heat-curable polymer having a hydroxyl group and a salt-forming group present at least partially in ionised form.
Claim 14
Dependent Claim
100 words
A method according to claim 12, in which the electrodepositable polymer is an adduct of an epoxide resin with an amine; or a copolymer of a hydroxyl-containing vinyl monomer with a vinyl monomer having a salt-forming group and the blocked isocyanate has, per average molecule, more than one group of formula -NH-CO-X I where X denotes the residue of a compound having an isocyanate-reactive group which is an alcoholic or phenolic hydroxyl group, a group =N-OH in an oxime, a mercapto group or a primary or secondary amino group, after removal of an active hydrogen atom from the isocyanate-reactive group.
Claim 15
Independent Claim
27 words
A method according to any of the preceding claims, in which the electrodeposited polymeric film is heated in step (ii) at a temperature of 100 to 150°C.
Claim 16
Independent Claim
28 words
A method according to any of the preceding claims, in which after step (iv) at least part of the electrodeposited polymeric film is removed using a solvent therefor.
Claim 17
Dependent Claim
30 words
A method according to claim 15, in which the resist is removed in step (iii) using an aqueous solvent and the electrodeposited polymeric film is removed using an organic solvent.
Claim 18
Independent Claim
23 words
A method according to any of the preceding claims, in which the metallic pattern is a printed circuit and the metal is copper.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.