US4550061A
Expired / Lapsed
US
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Electroerosion printing media using depolymerizable polymer coatings
Assignee: IBM Information Products Corp
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Filing: 1984-04-13
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Granted: 1985-10-29
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Expires: 2004-04-13
Abstract
Abstract Improved electroerosion recording media are described in which ablatable polymers are used in the electroerosion recording medium. This medium includes at least a substrate or support layer, a base layer which protects the substrate, a thin film of conductive material on the base layer and which can be eroded, and a protective overcoat layer. Ablatable polymers are used as binders in either the base layer or the top protective layer, or both, in order to provide advantages during electroerosion. These ablatable polymers undergo thermally induced depolymerization in such a way that the result is the formation of volatile monomeric or low molecular weight species as the predominant products, with little or no adherent residue.
Inventors
- 👤 Krishna G. Sachdev
- 👤 Stephen A. Shear
- 👤 Keith S. Pennington
- 👤 Mitchell S. Cohen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:14
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/24; B41M5/245; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10T; Y10T428/00; Y10T428/31504; Y10T428/3154; Y10T428/31544; Y10T428/31678; Y10T428/31692; Y10T428/31699; Y10T428/31855; Y10T428/31935
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
203 words
An improved electroerosion recording medium comprising a non-conductive support member, a thin layer of conductive material which is removed during electroerosion recording, and a base layer located between said support member and said thin layer of conductive material, said base layer being comprised of a thermally depolymerizable, high molecular weight polymer having a glass transition temperature greater than about 100° C. which undergoes thermally-induced, main-chain-scission during electroerosion recording to monomeric or low molecular weight species with little or no residue, where said depolymerizable polymer is selected from the group consisting of (a) polymers derived from acrylate monomers having a substituent in the 2-position of the double bond as represented by the following structure: ##STR10## where X=--CH 3 , --CF 3 , --C 2 H 5 , --C 6 H 5 R=--H, --CH 3 , --CH 2 CH 2 CH 2 CF 3 , --CH 2 C 6 H 5 , --C 2 H 5 , --C 6 H 5 (b) α-Substituted styrene polymers, (c) polymers derived from vinyl ketone monomers, given by the structure ##STR11## where X=--CH 3 , --C 6 H 5 , --CH 2 CH 3 , R=--CH 3 , --CH 2 CH 3 , --C 6 H 5 (d) Polyoxymethylene.
Claim 2
Dependent Claim
203 words
An improved electroerosion recording medium comprising a non-conductive support member, a thin layer of conductive material which is removed during electroerosion recording, and a base layer located between said support member and said thin layer of conductive material, said base layer being comprised of a thermally depolymerizable, high molecular weight polymer having a glass transition temperature greater than about 100° C. which undergoes thermally-induced, main-chain-scission during electroerosion recording to monomeric or low molecular weight species with little or no residue, where said depolymerizable polymer is selected from the group consisting of (a) polymers derived from acrylate monomers having a substituent in the 2-position of the double bond as represented by the following structure: ##STR10## where X=--CH 3 , --CF 3 , --C 2 H 5 , --C 6 H 5 R=--H, --CH 3 , --CH 2 CH 2 CH 2 CF 3 , --CH 2 C 6 H 5 , --C 2 H 5 , --C 6 H 5 (b) α-Substituted styrene polymers, (c) polymers derived from vinyl ketone monomers, given by the structure ##STR11## where X=--CH 3 , --C 6 H 5 , --CH 2 CH 3 , R=--CH 3 , --CH 2 CH 3 , --C 6 H 5 (d) Polyoxymethylene.
Claim 3
Dependent Claim
15 words
The medium of claim 1, where said thin conductive layer is comprised of a metal.
Claim 4
Dependent Claim
46 words
The medium of claim 1, where said depolymerizable polymer is selected from the group consisting of polymethylmethacrylate of molecular weight greater than 80,000, polyfluorobutylmethacrylate, polyethylmethacrylate, polyphenylmethacrylate, polymethyltrifluoromethacrylate, polymethacrylic acid, polymethacrylic anhydride, methylmethacrylate-methacrylic acid copolymer, poly α-methyl styrene, methylmethacrylate-methacrylic anhydride-methacrylic acid terpolymer, poly α,β,β,-trifluorostyrene, α-methyl styrene-methylmetacrylate copolymer.
Claim 5
Dependent Claim
13 words
The electroerosion medium of claim 1, where said base layer includes a filler.
Claim 6
Dependent Claim
140 words
The electroerosion recording medium of claim 1, where said α-substituted styrene polymer is selected from the group consisting of (a) polymers derived from styrene monomers given by the structural formula ##STR12## where X=--CH 3 , --C 2 H 5 , --F, --CF 3 y=--H, --CH 3 , --C 2 H 5 , --OCH 3 , --OC 2 H 5 , COOR (R=--CH 3 , --C 2 H 5 ) (b) styrene polymers having the following structural features: ##STR13## where y=--H, --CH 3 , --C 2 H 5 (c) copolymers derived from α-substituted styrenes and α-substituted acrylates represented by the structural formula ##STR14## where X, X'=--CF 3 , --CH 3 , --C 2 H 5 y=--H, --CH 3 , --C 2 H 5 , --OC 2 H 5 R=--CH 3 , --C 2 H 5 , --C 6 H 5 .
Claim 7
Dependent Claim
45 words
The electroerosion medium of claim 1, including a protective overlayer over said thin layer of conductive material, said protective overlayer being comprised of a depolymerizable polymer which underoges thermally-induced main-chain-scission to monomeric or low molecular weight species with little or no residue during electroerosion recording.
Claim 8
Dependent Claim
129 words
The electroerosion medium of claim 6, where said depolymerizable polymer is selected from the group consisting of: (a) polymers derived from acrylate monomers having a substituent in the 2-position of the double bond as represented by the following structure: ##STR15## where X=--CH 3 , --CF 3 , --C 2 H 5 , --C 6 H 5 R=--H, --CH 3 , --CH 2 CH 2 CH 2 CF 3 , --CH 2 C 6 H 5 , --C 2 H 5 , --C 6 H 5 (b) α-Substituted styrene polymers, (c) polymers derived from vinyl ketone monomers, given by the structure ##STR16## where X=--CH 3 , --C 6 H 5 , --CH 2 CH 3 , R=--CH 3 , --CH 2 CH 3 , --C 6 H 5 (d) Polyoxymethylene.
Claim 9
Dependent Claim
47 words
The electroerosion medium of claim 7, where said depolymerizable polymer is selected from the group consisting of polymethylmethacrylate of molecular weight greater than 80,000, polyfluorobutylmethacrylate, polyethylmethacrylate, polymethyltrifluoromethacrylate, polyphenylmethacrylate, polymethacrylic acid, polymethacrylic anhydride, methylmethacrylate-methacrylic acid copolymer, poly α-methyl styrene, methylmethacrylatemethacrylic anhydride-methacrylic acid terpolymer, poly α,β,β,-trifluorostyrene, α-methyl styrene-methylmethacrylate copolymer.
Claim 10
Dependent Claim
140 words
The electroerosion recording medium of claim 7, where said α-substituted styrene polymer is selected from the group consisting of (a) polymers derived from styrene monomers given by the structural formula ##STR17## where X=--CH 3 , --C 2 H 5 , --F, --CF 3 y=--H, --CH 3 , --C 2 H 5 , --OCH 3 , --OC 2 H 5 , COOR (R=--CH 3 , --C 2 H 5 ) (b) styrene polymers having the following structural features: ##STR18## where y=--H, --CH 3 , --C 2 H 5 (c) copolymers derived from α-substituted styrenes and α-substituted acrylates represented by the structural formula ##STR19## where X, X'=--CF 3 , --CH 3 , --C 2 H 5 y=--H, --CH 3 , --C 2 H 5 , --OC 2 H 5 R=--CH 3 , --C 2 H 5 , --C 6 H 5 .
Claim 11
Dependent Claim
194 words
An improved electroerosion recording medium comprising a non-conductive support member, a thin layer of conductive material, and a protective overlayer for protection of said conductive material, said protective overlayer including a lubricant and a thermally depolymerizable polymer having a glass transition temperature greater than about 100° C. which undergoes thermally induced main chain scission to monomeric or low molecular weight species with little or no residue during electroerosion recording, where said depolymerizable polymer is selected from the group consisting of (a) polymers derived from acrylate monomers having a substituent in the 2-position of the double bond as represented by the following structure: ##STR20## where X=--CH 3 , --CF 3 , --C 2 H 5 , --C 6 H 5 R=--H, --CH 3 , --CH 2 CH 2 , CH 2 , CF 3 , --CH 2 C 6 H 5 , --C 2 H 5 , --C 6 H 5 (b) α-substituted styrene polymers, (c) polymers derived from vinyl ketone monomers, given by the structure ##STR21## where X=--CH 3 , --C 6 H 5 , --CH 2 CH 3 , R=--CH 3 , --CH 2 CH 3 , --C 6 H 5 (d) Polyoxymethylene.
Claim 12
Dependent Claim
194 words
An improved electroerosion recording medium comprising a non-conductive support member, a thin layer of conductive material, and a protective overlayer for protection of said conductive material, said protective overlayer including a lubricant and a thermally depolymerizable polymer having a glass transition temperature greater than about 100° C. which undergoes thermally induced main chain scission to monomeric or low molecular weight species with little or no residue during electroerosion recording, where said depolymerizable polymer is selected from the group consisting of (a) polymers derived from acrylate monomers having a substituent in the 2-position of the double bond as represented by the following structure: ##STR20## where X=--CH 3 , --CF 3 , --C 2 H 5 , --C 6 H 5 R=--H, --CH 3 , --CH 2 CH 2 , CH 2 , CF 3 , --CH 2 C 6 H 5 , --C 2 H 5 , --C 6 H 5 (b) α-substituted styrene polymers, (c) polymers derived from vinyl ketone monomers, given by the structure ##STR21## where X=--CH 3 , --C 6 H 5 , --CH 2 CH 3 , R=--CH 3 , --CH 2 CH 3 , --C 6 H 5 (d) Polyoxymethylene.
Claim 13
Dependent Claim
46 words
The medium of claim 10, where said depolymerizable polymer is selected from the group consisting of polymethylmethacrylate of molecular weight greater than 80,000, polyfluorobutylmethacrylate, polyethylmethacrylate, polymethyltrifluoromethacrylate, polyphenylmethacrylate, polymethacrylic acid, polymethacrylic anhydride, methylmethacrylate-methacrylic acid copolymer, poly α-methyl styrene, methylmethacrylate-methacrylic anhydride-methacrylic acid terpolymer, poly α,β,β,-trifluorostyrene, α-methyl styrene-methylmethacrylate copolymer.
Claim 14
Dependent Claim
138 words
The medium of claim 10, where said α-substituted styrene polymer is selected from the group consisting of (a) polymers derived from styrene monomers given by the structural formula ##STR22## where X=--CH 3 , --C 2 H 5 , --F, --CF 3 y=--H, --CH 3 , --C 2 H 5 , --OCH 3 , --OC 2 H 5 , COOR (R=--CH 3 , --C 2 H 5 ) (b) styrene polymers having the following structural features: ##STR23## where y=--H, --CH 3 , --C 2 H 5 (c) copolymers derived from α-substituted styrenes and α-substituted acrylates represented by the structural formula ##STR24## where X, X'=--CF 3 , --CH 3 , --C 2 H 5 y=--H, --CH 3 , --C 2 H 5 , --OC 2 H 5 R=--CH 3 , --C 2 H 5 , --C 6 H 5 .
Claim 15
Dependent Claim
217 words
An improved electroerosion recording medium comprising a non-conductive support member, a thin layer of conductive material which is patterned during electroerosion recording, a hard polymer base layer located between said support member and said thin layer of conductive material, and an additional layer located between said thin layer and said base layer, said additional layer being comprised of a thermally depolymerizable polymer having a glass transition temperature greater than about 100° C. which undergoes thermally induced main chain scission to monomers or low molecular weight species with little or no residue during electroerosion recording, where said depolymerizable polymer is chosen from the group consisting of (a) polymers derived from acrylate monomers have a substituent in a 2-position of the double bond as represented by the following structure: ##STR25## where X=--CH 3 , --CF 3 , --C 2 H 5 , --C 6 H 5 R=--H, --CH 3 , --CH 2 CH 2 CH 2 CF 3 , --CH 2 C 6 H 5 , --C 2 H 5 , --C 6 H 5 (b) α-substituted styrene polymers (c) polymers derived from vinyl ketone monomers, given by the structure ##STR26## where X=--CH 3 , --C 6 H 5 , --CH 2 CH 3 , R=--CH 3 , --CH 2 CH 3 , --C 6 H 5 (d) Polyoxymethylene.
Claim 16
Dependent Claim
217 words
An improved electroerosion recording medium comprising a non-conductive support member, a thin layer of conductive material which is patterned during electroerosion recording, a hard polymer base layer located between said support member and said thin layer of conductive material, and an additional layer located between said thin layer and said base layer, said additional layer being comprised of a thermally depolymerizable polymer having a glass transition temperature greater than about 100° C. which undergoes thermally induced main chain scission to monomers or low molecular weight species with little or no residue during electroerosion recording, where said depolymerizable polymer is chosen from the group consisting of (a) polymers derived from acrylate monomers have a substituent in a 2-position of the double bond as represented by the following structure: ##STR25## where X=--CH 3 , --CF 3 , --C 2 H 5 , --C 6 H 5 R=--H, --CH 3 , --CH 2 CH 2 CH 2 CF 3 , --CH 2 C 6 H 5 , --C 2 H 5 , --C 6 H 5 (b) α-substituted styrene polymers (c) polymers derived from vinyl ketone monomers, given by the structure ##STR26## where X=--CH 3 , --C 6 H 5 , --CH 2 CH 3 , R=--CH 3 , --CH 2 CH 3 , --C 6 H 5 (d) Polyoxymethylene.
Claim 17
Dependent Claim
15 words
The medium of claim 13, wherein said thin conductive layer is comprised of a metal.
Claim 18
Dependent Claim
37 words
The medium of claim 13 where said base layer is comprised of a depolymerizable polymer which undergoes thermally induced main chain scission to monomeric or low molecular weight species with little or no residue during electroerosion recording.
Claim 19
Dependent Claim
46 words
The medium of claim 13, further including a lubricant-protective layer over said thin conductive layer, said lubricant-protective layer being comprised of a depolymerizable polymer which undergoes thermally induced main chain scission to monomeric or low molecular weight species with little or no residue during electroerosion recording.
Claim 20
Dependent Claim
138 words
The medium of claim 13, wherein said α-substituted styrene polymer is selected from the group consisting of (a) polymers derived from styrene monomers given by the structural formula ##STR27## where X=--CH 3 , --C 2 H 5 , --F, --CF 3 y=--H, --CH 3 , --C 2 H 5 , --OCH 3 , --OC 2 H 5 , COOR (R=--CH 3 , --C 2 H 5 ) (b) styrene polymers having the following structural features: ##STR28## where y=--H, --CH 3 , --C 2 H 5 (c) copolymers derived from α-substituted styrenes and α-substituted acrylates represented by the structural formula ##STR29## where X, X'=--CF 3 , --CH 3 , --C 2 H 5 y=--H, --CH 3 , --C 2 H 5 , --OC 2 H 5 R=--CH 3 , --C 2 H 5 , --C 6 H 5 .
Claim 21
Dependent Claim
97 words
An improved electroerosion recording medium comprising a non-conductive support member, a thin layer of conductive material which is removed during electroerosion recording to produce a pattern therein, and a base layer located between said support member and said thin layer of conductive material, said base layer being comprised of a thermally depolymerizable polymer which is substantially ligomer-free and of high molecular weight, said polymer having a glass transition temperature in excess of about 100° C. and undergoing sudden and rapid thermally-induced, main-chain-scission during electroerosion recording to monomeric or low molecular weight species with little or no residue.
Claim 22
Dependent Claim
97 words
An improved electroerosion recording medium comprising a non-conductive support member, a thin layer of conductive material which is removed during electroerosion recording to produce a pattern therein, and a base layer located between said support member and said thin layer of conductive material, said base layer being comprised of a thermally depolymerizable polymer which is substantially ligomer-free and of high molecular weight, said polymer having a glass transition temperature in excess of about 100° C. and undergoing sudden and rapid thermally-induced, main-chain-scission during electroerosion recording to monomeric or low molecular weight species with little or no residue.
Claim 23
Dependent Claim
93 words
An improved electroerosion recording medium comprising a non-conductive support member, a thin layer of conductive material which can be electroeroded to produce a pattern therein, and a protective overlayer for protection of said conductive material, said protective overlayer including a lubricant and a thermally depolymerizable polymer which is substantially ligomer-free and of high molecular weight, said polymer having a glass transition temperature in excess of about 100° C. and undergoing sudden and rapid thermally induced main chain scission to monomeric or low molecular weight species with little or no residue during electroerosion recording.
Claim 24
Dependent Claim
93 words
An improved electroerosion recording medium comprising a non-conductive support member, a thin layer of conductive material which can be electroeroded to produce a pattern therein, and a protective overlayer for protection of said conductive material, said protective overlayer including a lubricant and a thermally depolymerizable polymer which is substantially ligomer-free and of high molecular weight, said polymer having a glass transition temperature in excess of about 100° C. and undergoing sudden and rapid thermally induced main chain scission to monomeric or low molecular weight species with little or no residue during electroerosion recording.
Claim 25
Dependent Claim
109 words
An improved electroerosion recording medium comprising a non-conductive support member, a thin layer of conductive material which is patterned during electroerosion recording, a hard polymer base layer located between said support member and said thin layer of conductive material, and an additional layer located between said thin layer and said base layer, said additional layer being comprised of a thermally depolymerizable polymer which is substantially ligomer-free and of high molecular weight, said polymer having a glass transition temperature in excess of about 100° C. and undergoing abrupt and rapid thermally induced main chain scission to monomers or low molecular weight species with litle or no residue during electroerosion recording.
Claim 26
Dependent Claim
109 words
An improved electroerosion recording medium comprising a non-conductive support member, a thin layer of conductive material which is patterned during electroerosion recording, a hard polymer base layer located between said support member and said thin layer of conductive material, and an additional layer located between said thin layer and said base layer, said additional layer being comprised of a thermally depolymerizable polymer which is substantially ligomer-free and of high molecular weight, said polymer having a glass transition temperature in excess of about 100° C. and undergoing abrupt and rapid thermally induced main chain scission to monomers or low molecular weight species with litle or no residue during electroerosion recording.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1988-10-28 | 1989-04-29 | 1989-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-10-28 | 1993-04-29 | 1993-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-10-28 | 1997-04-29 | 1997-10-29 | $7700.00 | Window Closed / Lapsed |