EP0244179A2
Expired / Lapsed
EP
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Heat-resistant paper container and process for preparation thereof
Assignee: Toyo Seikan Group Holdings Ltd
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Filing: 1987-04-27
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Granted: —
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Expires: 2007-04-27
Abstract
Abstract Disclosed is a heat-resistant paper container which comprises a bottomed seamless press-molded body comprising a laminate of a paper substrate (11) 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 (12a + 12b) formed on both the surfaces of the paper substrate (11), wherein the amount coated of the hiding pigment is 1 to 50 g/m², 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 condition: R P = k·O A ·d 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
EP
Data Source
google_patents
Last Synchronized
2026-11-03 15:08
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: 16
Claim 1
Independent Claim
141 words
A heat-resistant paper container which comprises a bottomed seamless press-molded body comprising a laminate of 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/m², 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 condition: R P = k·O A ·d 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
141 words
A heat-resistant paper container which comprises a bottomed seamless press-molded body comprising a laminate of 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/m², 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 condition: R P = k·O A ·d 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
29 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
19 words
A heat-resistant paper container as set forth in claim 2, wherein the thermosetting resin an epoxy-acrylic or epoxy-vinyl resin.
Claim 5
Dependent Claim
19 words
A heat-resistant paper container as set forth in claim 1, wherein the hiding pigment is composed of titanium dioxide.
Claim 6
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 7
Dependent Claim
21 words
A heat-resistant paper container as set forth in claim 1, wherein the paper substrate is a lowly acidic or neutral paper.
Claim 8
Dependent Claim
107 words
A process for the preparation of heat-resistant paper containers, which comprises press-molding a laminate material into a bottomed seamless container in a heated mold, said laminate material comprising a paper substrate and a coating layer of a hiding pigment-containing thermosetting paint applied to both the surfaces of the paper substrate, wherein the thermosetting paint has a glass transition point of 90 to 130°C as measured by a scanning calorimeter and the laminate has an elongation of at least 1.5% in the longitudinal direction and an elongation of at least 4.5% in the lateral direction as measured at a temperature of 20°C and a relative humidity of 65%.
Claim 9
Dependent Claim
107 words
A process for the preparation of heat-resistant paper containers, which comprises press-molding a laminate material into a bottomed seamless container in a heated mold, said laminate material comprising a paper substrate and a coating layer of a hiding pigment-containing thermosetting paint applied to both the surfaces of the paper substrate, wherein the thermosetting paint has a glass transition point of 90 to 130°C as measured by a scanning calorimeter and the laminate has an elongation of at least 1.5% in the longitudinal direction and an elongation of at least 4.5% in the lateral direction as measured at a temperature of 20°C and a relative humidity of 65%.
Claim 10
Dependent Claim
23 words
A process for the preparation of heat-resistant paper containers according to claim 7, wherein the thermosetting paint is an epoxy-acrylic or epoxy-vinyl paint.
Claim 11
Dependent Claim
75 words
A process for the preparation of heat-resistant paper containers according to claim 7, wherein the thermosetting resin is present in the coating layer at a weight ratio R S satisfying the following condition: R P = k·O A ·d 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 12
Dependent Claim
68 words
A process for the preparation of a bottomed seamless molded container of paper, which comprises coating an aqueous dispersion comprising a hiding pigment and a thermosetting resin having an average particle size of 0.05 to 1.0 µm as dispersed substances on at least one surface of a paper substrate, drying the coating layer to cure the thermosetting resin, and molding the obtained laminate into a bottomed seamless container.
Claim 13
Dependent Claim
68 words
A process for the preparation of a bottomed seamless molded container of paper, which comprises coating an aqueous dispersion comprising a hiding pigment and a thermosetting resin having an average particle size of 0.05 to 1.0 µm as dispersed substances on at least one surface of a paper substrate, drying the coating layer to cure the thermosetting resin, and molding the obtained laminate into a bottomed seamless container.
Claim 14
Dependent Claim
16 words
A process according to claim 10, wherein the thermosetting resin is a self-emulsifiable curable epoxy-acrylic resin.
Claim 15
Dependent Claim
65 words
A process for the preparation of a bottomed seamless molded container of paper, which comprises coating an aqueous paint comprising a hiding pigment as the dispersed substance and a water-soluble thermosetting epoxy-acrylic resin as the resin component on at least one surface of a paper substrate, drying the coating layer to cure the thermosetting resin, and press-molding the obtained laminate in a bottomed seamless container.
Claim 16
Dependent Claim
65 words
A process for the preparation of a bottomed seamless molded container of paper, which comprises coating an aqueous paint comprising a hiding pigment as the dispersed substance and a water-soluble thermosetting epoxy-acrylic resin as the resin component on at least one surface of a paper substrate, drying the coating layer to cure the thermosetting resin, and press-molding the obtained laminate in a bottomed seamless container.
References Cited (Backward Citations)
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