US4301210A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for manufacturing cast-coated paper
Assignee: Mitsubishi Paper Mills Ltd
•
Filing: 1980-07-17
•
Granted: 1981-11-17
•
Expires: 2000-07-17
Abstract
Abstract High quality cast-coated paper is obtained with high productivity by applying an aqueous coating composition containing a coating pigment and a binder to the surface of base paper by means of a blade coater to form an undercoating layer, the application rate being from 5 to 25 g/m2 on dry basis per side; then applying to said undercoating layer an aqueous coating composition containing a coating pigment and a polymer latex having a glass transition point of 38 DEG C. or higher to form an overcoating layer, drying said overcoating layer at a temperature below the glass transition point of the latex in said overcoating layer; and subjecting it to mirror finish treatment at a temperature higher than said glass transition point.
Inventors
- 👤 Nobu Yasuda
- 👤 Masafumi Masuda
- 👤 Tomoichi Morita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:47
CPC Classifications
D; D21; D21H; D21H19/00; D21H19/80; D21H19/82; D21H19/822; D21H25/00; D21H25/08; D21H25/12; D21H25/14; Y; Y10; Y10T; Y10T428/00; Y10T428/27; Y10T428/273; Y10T428/277; Y10T428/31504; Y10T428/31855; Y10T428/3188; Y10T428/31895; Y10T428/31899; Y10T428/31902; Y10T428/31906
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
152 words
A method for manufacturing cast-coated paper, which comprises applying at least one undercoating of an aqueous coating composition containing coating pigments and a binder to at least one side of the base paper to form at least one undercoating layer, at least one of the undercoatings being applied by means of a blade coater and the application rate of the undercoating being 5 to 25 g/m 2 on dry basis per side; then applying onto the undercoating layer an overcoating of an aqueous coating composition containing coating pigments and a polymer latex having a glass transition temperature of 38° C. or higher; drying the overcoating at a temperature below the glass transition temperature of the polymer latex; and subjecting it to a mirror finishing treatment at a temperature higher than said glass transition temperature to obtain a cast-coated paper having a specular gloss greater than 15% at an incident angle of 20°.
Claim 2
Independent Claim
152 words
A method for manufacturing cast-coated paper, which comprises applying at least one undercoating of an aqueous coating composition containing coating pigments and a binder to at least one side of the base paper to form at least one undercoating layer, at least one of the undercoatings being applied by means of a blade coater and the application rate of the undercoating being 5 to 25 g/m 2 on dry basis per side; then applying onto the undercoating layer an overcoating of an aqueous coating composition containing coating pigments and a polymer latex having a glass transition temperature of 38° C. or higher; drying the overcoating at a temperature below the glass transition temperature of the polymer latex; and subjecting it to a mirror finishing treatment at a temperature higher than said glass transition temperature to obtain a cast-coated paper having a specular gloss greater than 15% at an incident angle of 20°.
Claim 3
Dependent Claim
37 words
A method according to claim 1, wherein the coating pigments in the aqueous coating composition for overcoating contain 12 to 35 parts by weight of a plastic pigment per 100 parts by weight of the total pigments.
Claim 4
Dependent Claim
24 words
A method according to claim 1, wherein the application rate of the undercoating is 8 to 20 g/m 2 on dry basis per side.
Claim 5
Dependent Claim
18 words
A method according to claim 2, wherein the plastic pigment has a particle diameter of 2μ or less.
Claim 6
Dependent Claim
37 words
A method according to claim 1, wherein the polymer latex having a glass transition temperature of 38° C. or higher is an emulsion of polyvinyl acetate, styrene-isoprene copolymer, styrene-butadiene copolymer an acrylic polymer or a mixture thereof.
Claim 7
Dependent Claim
24 words
A method according to claim 1, wherein the application rate of the overcoating is 10 to 40 g/m 2 on dry basis per side.
Claim 8
Dependent Claim
22 words
A method according to claim 1, wherein the mirror finishing treatment is carried out at a temperature of 100° to 200° C.
Claim 9
Dependent Claim
29 words
A method according to claim 1, wherein the mirror finishing treatment is carried out by means of a heated calender under a linear pressure of 20 kg/cm or more.
Claim 10
Dependent Claim
36 words
A method according to claim 1, wherein the mirror finishing treatment is carried out by means of a heated calender at a temperature of 120°-180° C. and under a linear pressure of 40 to 190 Kg/cm.
Claim 11
Dependent Claim
11 words
A cast-coated paper manufactured by the method according to claim 1.
Claim 12
Dependent Claim
11 words
A cast-coated paper manufactured by the method according to claim 2.
References Cited (Backward Citations)
US3583881A
Cited
US3873345A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-11-16 | 1985-05-18 | 1985-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-16 | 1989-05-18 | 1989-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-16 | 1993-05-18 | 1993-11-17 | $7700.00 | Window Closed / Lapsed |