Patent EP0052968A2 successfully refreshed from Google Patents.
EP0052968A2
Expired / Lapsed
EP
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Coating of polymerical substrates
Assignee: Crosfield Electronics Ltd
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Filing: 1981-11-05
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Granted: —
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Expires: 2001-11-05
Abstract
Abstract A surface layer of a polymeric material. for instance an epoxy or other polymeric printing substrate, is prepared to receive a metal or other adherent coating by penetrating the surface layer with a first reactant and then with a second reactant that reacts in the surface layer to form pits that extend from the surface into the surface layer. The first reactant may comprise a pyrrole and the second reactant may comprise chromic acid.
Inventors
- 👤 Phillip Rodney Kellner
- 👤 Rexwell Barry Nicholls
- 👤 Mohammed Aslam Sahi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-23 04:41
CPC Classifications
B; B41; B41N; B41N3/00; B41N3/003; B41N1/00; B41N1/12
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
84 words
A process in which a surface layer of a polymeric material is prepared to receive an adherent coating by application of a reactant, characterised in that the process comprises penetrating the surface layer only with a first reactant and then with a second reactant and causing or allowing the second reactant to react with the first reactant within the surface layer to form pits that extend from the surface into the surface layer substantially without chemical degradation of the polymeric material between the pits.
Claim 2
Dependent Claim
84 words
A process in which a surface layer of a polymeric material is prepared to receive an adherent coating by application of a reactant, characterised in that the process comprises penetrating the surface layer only with a first reactant and then with a second reactant and causing or allowing the second reactant to react with the first reactant within the surface layer to form pits that extend from the surface into the surface layer substantially without chemical degradation of the polymeric material between the pits.
Claim 3
Dependent Claim
42 words
A process according to claim 1 characterised in that the first reactant comprises an organic solvent and penetrates the surface layer substanitally without swelling or causing other visible changes in the surface appearance when viewed under a magnification of up to 100.
Claim 4
Dependent Claim
26 words
A process according to claim 2 characterised in that the first reactant comprises a keto derivative of a pyrrole that may be partially or fully saturated.
Claim 5
Dependent Claim
16 words
A process according to claim 3 characterised in that the first reactant comprises N-methyl-2-pyrrolidone or N-methyl-3-pyrrolin-2-one.
Claim 6
Dependent Claim
16 words
A process according to claim 3 characterised in that the first reactant comprises Russian White turpentine.
Claim 7
Dependent Claim
52 words
A process according to any preceding claim characterised in that the second reactant comprises a chemical etchant that is applied at a temperature and duration such that, if used without the first reactant, it causes substantially no visible change in the surface appearance when viewed under a magnification of up to 100.
Claim 8
Dependent Claim
31 words
A process according to any preceding claim. characterised in that the second reactant comprises an oxidising agent that reacts with the first solvent with a redox reaction to form gaseous products.
Claim 9
Dependent Claim
16 words
A process according to any preceding claim characterised in that the second. reactant comprises chromic acid.
Claim 10
Dependent Claim
19 words
A process according to any preceding claim characterised in that the surface layer is less than 5 microns thick.
Claim 11
Dependent Claim
19 words
A process according to claim. 9 characterised in that the surface layer is from 0.05 to 0.5 microns thick.
Claim 12
Dependent Claim
39 words
A process according to any preceding claim characterised in that the penetration of the first reactant is controlled by providing it in the form of a solution in an inert cosolvent or in an emulsion in water or both.
Claim 13
Dependent Claim
60 words
A process according to claim 11 characterised in that the first reactant is provided as a 40 to 70% by volume emulsion in water of a mixture of 0.5 to 5 parts by volume of a keto derivative of a pyrrole that may be partially or fully saturated or Russian White turpentine with one part by volume inert cosolvent. -
Claim 14
Dependent Claim
25 words
A process according to claim 11 or claim 12 characterised in that the cosolvent is an alkyl ether of ethylene glycol or of diethylene glycol.
Claim 15
Dependent Claim
22 words
A process according to any preceding claim characterised in that the polymeric material is an epoxy resin containing less than 20% filler.
Claim 16
Dependent Claim
36 words
A process according to any preceding claim characterised in that the surface layer is the surface layer of a printing member that is engraved with gravure cells and that has substantially non-print characteristics between the cells.
Claim 17
Dependent Claim
26 words
A process according to any preceding claim characterised in that an adherent coating of metal is subsequently applied to the pitted surface by electroless metal deposition.
Claim 18
Dependent Claim
74 words
A composition suitable for use in the process of claim 12 and comprising a reactant that is a keto derivative of a pyrrole that may be partially or fully saturated or is Russian White turpentine characterised in that the reactant is provided as a 40 to 70% by volume emulsion in water of a mixture of 0.5 to 5 parts by volume of the reactant with one part by volume of an inert cosolvent.
Claim 19
Dependent Claim
22 words
A composition according to claim 17 characterised in that the cosolvent is an alkyl ether of ethylene glycol or of diethylene glycol.
References Cited (Backward Citations)
No citation records indexed.
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