Patent US4775560A successfully refreshed from Google Patents.
US4775560A
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US
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Heat-resistant paper container and process for preparation thereof
Assignee: Toyo Seikan Group Holdings Ltd
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Filing: 1987-04-28
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Granted: 1988-10-04
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Expires: 2007-04-28
Abstract
Abstract Disclosed is a heat-resistant paper container which comprises a bottomed seamless press-molded body comprising a laminate of a paper substrate having an elongation of at least 1.5% in the longitudinal direction and an elongation of at least 4.5% in the lateral direction and a coating layer of a hiding pigment formed on both the surfaces of the paper substrate, wherein the amount coated of the hiding pigment is 1 to 50 g/m 2 , the binder in the coating layer is a thermosetting resin binder and the binder is present in the coating layer at a weight ratio R P satisfying the following conditions: R.sub.P =k·O.sub.A ·d.sub.R (1) wherein O A stands for the oil absorption (ml/100 g) of the hiding pigment, d A stands for the density (g/ml) of the binder, and k is a number of from 0.005 to 0.2.
Inventors
- 👤 Tadahiko Katsura
- 👤 Takaaki Mochida
- 👤 Toshiaki Iioka
- 👤 Toshifumi Tanabashi
- 👤 Seishichi Kobayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 16:47
CPC Classifications
B; B65; B65D; B65D81/00; B65D81/34; B65D81/3446; D; D21; D21H; D21H19/00; D21H19/36; D21H19/44; D21H19/56; B65D2581/00; B65D2581/34; B65D2581/3437; B65D2581/3439; B65D2581/3448; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1303; Y10T428/31504; Y10T428/31511; Y10T428/31971; Y10T428/31993
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
146 words
A heat-resistant paper container which comprises a bottomed seamless press-molded body comprising a laminate of a paper substrate having an elongtion of at least 1.5% in the longitudinal direction and an elongation of at least 4.5% in the lateral direction and a coating layer of a hiding pigment comprising titanium dioxide formed on both the surfaces of the paper substrate, wherein the amount coated of the hiding pigment is 1 to 50 g/m 2 , the binder in the coating layer is an eqoxy-acrylic or epoxy-vinyl thermosetting resin and the binder is present in the coating layer at a weight ratio R P satisfying the following condition R.sub.P =k·O.sub.A ·d.sub.R ( 1) wherein O A stands for the oil absorption (ml/100 g) of the hiding pigment, d R stands for the density (g/ml) of the binder, and k is a number of from 0.005 to 0.2.
Claim 2
Dependent Claim
146 words
A heat-resistant paper container which comprises a bottomed seamless press-molded body comprising a laminate of a paper substrate having an elongtion of at least 1.5% in the longitudinal direction and an elongation of at least 4.5% in the lateral direction and a coating layer of a hiding pigment comprising titanium dioxide formed on both the surfaces of the paper substrate, wherein the amount coated of the hiding pigment is 1 to 50 g/m 2 , the binder in the coating layer is an eqoxy-acrylic or epoxy-vinyl thermosetting resin and the binder is present in the coating layer at a weight ratio R P satisfying the following condition R.sub.P =k·O.sub.A ·d.sub.R ( 1) wherein O A stands for the oil absorption (ml/100 g) of the hiding pigment, d R stands for the density (g/ml) of the binder, and k is a number of from 0.005 to 0.2.
Claim 3
Dependent Claim
30 words
A heat-resistant paper container as set forth in claim 1, wherein the thermosetting resin has a glass transition point of 90° to 130° C. as measured by a scanning calorimeter.
Claim 4
Dependent Claim
58 words
A heat-resistant paper container as set forth in claim 1, wherein the coating layer is formed so that the condition of l/L<0.1 is satisfied, in which L stands for the thickness of the laminate and coating layer and l stands for the permeation depth of the resin from the surface of the coating layer into the paper substrate.
Claim 5
Dependent Claim
25 words
A heat-resistant paper container as set forth in claim 1, wherein the paper substrate is a paper having a low acidity or a neutral paper.
Claim 6
Dependent Claim
24 words
A heat-resistant paper container as set forth in claim 3, wherein the coating layer is formed so that the condition of 0.015≦l/L<0.08 is satisfied.
Claim 7
Dependent Claim
25 words
A heat-resistant paper container as set forth in claim 4, wherein the paper substrate has been treated with a neutral or weakly acidic sizing agent.
Claim 8
Dependent Claim
33 words
A heat-resistant paper container as set forth in claim 6, wherein the paper substrate is a neutral paper formed by using an alkyl ketene dimer or alkenyl succinic anhydride as a sizing agent.
Claim 9
Dependent Claim
23 words
A heat-resistant paper container as set forth in claim 1, wherein the pigment is composed of a rutile type or anatase-type titanium dioxide.
Claim 10
Dependent Claim
43 words
A heat-resistant paper container as set forth in claim 1, wherein the epoxy resin component of the epoxy-acrylic or epoxy-vinyl thermosetting resin is an aromtic epoxy resin formed by condensing bisphenol A with an epihalohydrin having an epoxy equivalent of 1,000 to 4,000.
Claim 11
Dependent Claim
31 words
A heat-resistant paper container as set forth in claim 1, wherein the thermosetting resin is present as an aqueous dispersion comprising resin particles having particle size of 0.05 to 1.0 μ.
Claim 12
Dependent Claim
19 words
A heat-resistant paper container as set forth in claim 1, wherein the thermoplastic resin is a self-emulsifiable epoxy-acrylic resin.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-10-04 | 1992-04-04 | 1992-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-10-04 | 1996-04-04 | 1996-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-10-04 | 2000-04-04 | 2000-10-04 | $7700.00 | Window Closed / Lapsed |