Patent US4400492A successfully refreshed from Google Patents.
US4400492A
Expired / Lapsed
US
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Color-developer for pressure-sensitive recording sheets
Assignee: Mitsui Toatsu Chemicals Inc
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Filing: 1981-03-24
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Granted: 1983-08-23
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Expires: 2001-03-24
Abstract
Abstract Disclosed is a color-developer for pressure-sensitive recording sheets, comprising a co-condensate of a reaction intermediate of a p-substituted phenol and a trifunctional or higher phenol, or a polyvalent metal salt of said co-condensate, said reaction intermediate being obtained by the reaction of said p-substituted phenol under acidic conditions with formaldehyde or a substance capable of generating formaldehyde.
Inventors
- 👤 Makoto Asano
- 👤 Saburo Kawashima
- 👤 Yoshimitu Tanabe
- 👤 Hisamichi Murakami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:05
CPC Classifications
C; C08; C08G; C08G8/00; C08G8/04; C08G8/08; C08G8/12; B; B41; B41M; B41M5/00; B41M5/124; B41M5/132; B41M5/155; C08G8/24; C08L; C08L61/00; C08L61/04; C08L61/06
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
84 words
A color developer for pressure-sensitive recording sheets, said color-developer comprising a co-condensate obtained by co-condensing a reaction intermediate of at least one p-substituted phenol with at least one higher functional phenol selected from the group consisting of 4,4'-isopropylidene-biphenol, 4,4'cyclohexylidene-biphenol and 4,4'-biphenol sulfon under neutral or acidic conditions, and/or a polyvalent metal salt of the said co-condensate, said reaction intermediate being obtained by reacting said p-substituted phenol under acidic conditions with at least an equimolar amount of formaldehyde or a substance capable of generating formaldehyde.
Claim 2
Dependent Claim
84 words
A color developer for pressure-sensitive recording sheets, said color-developer comprising a co-condensate obtained by co-condensing a reaction intermediate of at least one p-substituted phenol with at least one higher functional phenol selected from the group consisting of 4,4'-isopropylidene-biphenol, 4,4'cyclohexylidene-biphenol and 4,4'-biphenol sulfon under neutral or acidic conditions, and/or a polyvalent metal salt of the said co-condensate, said reaction intermediate being obtained by reacting said p-substituted phenol under acidic conditions with at least an equimolar amount of formaldehyde or a substance capable of generating formaldehyde.
Claim 3
Dependent Claim
78 words
A color developer for pressure-sensitive recording sheets, said color-developer comprising a polyvalent metal salt of co-condensate obtained by co-condensing a reaction intermediate of at least one p-substituted phenol with C 6 H 5 OH under neutral of acidic conditions, said reaction intermediate being obtained by reacting said p-substituted phenol under acidic conditions with at least an equimolar amount of formaldehyde or a substance capable of generating formaldehyde, and then converting the co-condensate into a polyvalent metal salt thereof.
Claim 4
Dependent Claim
78 words
A color developer for pressure-sensitive recording sheets, said color-developer comprising a polyvalent metal salt of co-condensate obtained by co-condensing a reaction intermediate of at least one p-substituted phenol with C 6 H 5 OH under neutral of acidic conditions, said reaction intermediate being obtained by reacting said p-substituted phenol under acidic conditions with at least an equimolar amount of formaldehyde or a substance capable of generating formaldehyde, and then converting the co-condensate into a polyvalent metal salt thereof.
Claim 5
Dependent Claim
25 words
The color-developer of claim 1 wherein the amount of the higher functional phenol is from 0.3 to 1.0 mole per mole of the p-substituted phenol.
Claim 6
Dependent Claim
27 words
The color-developer of claim 2 wherein the amount of the C 6 H 5 OH ranges from 0.3 to 1.0 mole per mole of the p-substituted phenol.
Claim 7
Dependent Claim
47 words
The color developer of claim 1 wherein the mole ratio (F/p) of the moles of formaldehyde or the formaldehyde generating substance to the total moles of the p-substituted phenol and wherein the moles of the higher functional phenol is within the range of from 0.7 to 1.0.
Claim 8
Dependent Claim
40 words
The color developer of claim 2 wherein the mole ratio (F/p) of the moles of formaldehyde or the formaldehyde generating substance to the total moles of C 6 H 5 OH is within the range of from 0.7 to 1.0.
Claim 9
Dependent Claim
56 words
The color developer of claim 1 wherein said p-substituted phenol and said formaldehyde or formaldehyde generating substance are reacted in the presence of 0.2 to 10 parts by weight of an acid per 100 parts by weight of the combined amount of the p-substituted phenol and the higher functional phenol used in the subsequent co-condensation reaction.
Claim 10
Dependent Claim
57 words
The color developer of claim 2 wherein said p-substituted phenol and said formaldehyde or formaldehyde generating substance are reacted in the presence of 0.2 to 10 parts by weight of an acid per 100 parts by weight of the combined amount of the p-substituted phenol and C 6 H 5 OH used in the subsequent co-condensation reaction.
Claim 11
Dependent Claim
23 words
The color developer of claim 1 wherein said reaction intermediate is co-condensed with said higher functional phenol at 80° C. to 120° C.
Claim 12
Dependent Claim
25 words
The color developer of claim 2 wherein said reaction intermediate is co-condensed with said C 6 H 5 OH at 80° C. to 120° C.
Claim 13
Dependent Claim
27 words
The color developer of claim 1 wherein the polyvalent metal salt of the co-condensate is a salt of the co-condensate with zinc, nickel, magnesium, calcium or aluminum.
Claim 14
Dependent Claim
27 words
The color developer of claim 2 wherein the polyvalent metal salt of the co-condensate is a salt of the co-condensate with zinc, nickel, magnesium, calcium or aluminum.
Claim 15
Dependent Claim
25 words
The color developer of claim 1 wherein the metal content of the polyvalent metal salt of the co-condensate is from 1.0 to 8.0% by weight.
Claim 16
Dependent Claim
25 words
The color developer of claim 2 wherein the metal content of the polyvalent metal salt of the co-condensate is from 1.0 to 8.0% by weight.
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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) | 1986-08-22 | 1987-02-21 | 1987-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-22 | 1991-02-21 | 1991-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-22 | 1995-02-21 | 1995-08-23 | $7700.00 | Window Closed / Lapsed |