EP0121781A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Process for manufacturing glasslike carbon material
Assignee: Kao Corp
•
Filing: 1984-03-08
•
Granted: —
•
Expires: 2004-03-08
Abstract
Abstract A process for manufacturing glasslike carbon material is disclosed in which a thermosetting resin, which exhibits hydrophilic properties and is capable of containing a least 20% by weight of water and has a viscosity in the range of from 100 to 8000 cps (at 25°C), is carbonized and sintered in an inert atmosphere at a temperature of at least 800°C. A molded product which is manufactured according to the invention process and which is useful as a substrate for a magnetic head is also disclosed.
Inventors
- 👤 Michihide Yamauchi
- 👤 Nobuyuki Kishine
- 👤 Tetsuya Imamura
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 01:19
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/31; C; C01; C01B; C01B32/00; C01B32/05; C04; C04B; C04B35/00; C04B35/515; C04B35/52; C04B35/524; G11B5/187; G11B5/1871; G11B5/3163
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
66 words
A process for manufacturing a glasslike carbon material comprising carbonizing and sintering in an inert atmosphere at a temperature of at least 800°C a thermo- se--ting resing, characterized in that a thermosetting resin is used which is capable of containing at least 20% by weight of water when said resin is in the state of an initial condensate before hardening and producing a glasslike carbon material.
Claim 2
Dependent Claim
66 words
A process for manufacturing a glasslike carbon material comprising carbonizing and sintering in an inert atmosphere at a temperature of at least 800°C a thermo- se--ting resing, characterized in that a thermosetting resin is used which is capable of containing at least 20% by weight of water when said resin is in the state of an initial condensate before hardening and producing a glasslike carbon material.
Claim 3
Dependent Claim
85 words
The Process according to claim 1, characterized in that the thermosetting resin is a resin composition having a viscosity of from 100 to 8000 cps/25°C comprising: from 70 to 100 parts by weight of at least one compound selected from the group consisting of a first monomer mixture, phenol resin, furan resin and phenol modified furan co-condensate; and from 0 to 30 parts by weight of at least one compound selected from the group consisting of a second monomer mixture, urea resin and melamine resin.
Claim 4
Dependent Claim
26 words
The process according to claim 2, characterized in that said first monomer mixture contains phenol and formalin in the mole ratio of from 1:3 to 1:0.5.
Claim 5
Dependent Claim
27 words
The process according to claim 2, characterized in that said first monomer mixture contains furfuryl alcohol and formalin in the mole ration of from 1:1 to 1:0.
Claim 6
Dependent Claim
30 words
The process according to claim 2, characterized in that said first monomer mixture contains both phenol and furfuryl alcohol, and formalin in the mole ratio of from 30:55 to 75:30.
Claim 7
Dependent Claim
31 words
The process according to one of the claims 2 to 5, characterized in that said second monomer mixture contains urea and formalin in the mole ratio of from 1:2 to 1:0.5.
Claim 8
Dependent Claim
31 words
The process according to one of the claims 2 to 5, characterized in that said second monomer mixture contains melamine and formalin in the mole ratio of from 1:6 to 1:0.5.
Claim 9
Dependent Claim
34 words
The process according to one of the claims 2 to 5, characterized in that said second monomer mixture contains both urea and melamine, and formalin in the mole ratio of from 30:55 to 75:30.
Claim 10
Dependent Claim
47 words
The process according to claim 1, characterized in that said thermosetting resin is a resin composition obtained by co-condensing from 15 to 40 of phenol, from 15 to 35 of furfuryl alcohol and from 30 to 55 of formalin based on the mole ratio converted to monomer.
Claim 11
Dependent Claim
110 words
The process according to claim 1, characterized in that said thermosetting resin is a resin composition having a viscosity of from 100 to 8000 cps at 25°C comprising: from 70 to 100 parts by weight of at least one compound selected from the group consisting of athird monomer mixture, phenol resin, furan resin and phenol modified furan co-condensate; from 0 to 15 parts by weight of at least one compound selected from the group consisting of lignin, modified resin and modified cellulose; and from 0 to 15 parts by weight of at least one compound selected from the group consisting of a fourth monomer mixture, urea resin and melamine resin.
Claim 12
Dependent Claim
26 words
The process according to claim 10, characterized in that said third monomer mixture contains phenol and formalin in the mole ratio of from 1:3.5 to 1:0.5.
Claim 13
Dependent Claim
27 words
The process according to claim 10, characterized in that said third monomer mixture contains furfuryl alcohol and formalin in the mole ratio of from 1:1.2 to 1:0.
Claim 14
Dependent Claim
30 words
The process according to claim 10, characterized in that said third monomer mixture contains both phenol and furfuryl alcohol, and formalin in the mole ratio of from 30:55 to 75:30.
Claim 15
Dependent Claim
30 words
The process according to one of the claims 10 to 13, characterized in that said fourth mixture contains urea and formalin in the mole ratio of from 1:2 to 1:0.5.
Claim 16
Dependent Claim
31 words
The process according to one of the claims 10 to 13, -characterized in that said fourth monomer mixture contains melamine and formalin in the mole ratio of from 1:6 to 1:0.5.
Claim 17
Dependent Claim
34 words
The process according to one of the claims 10 to 13, characterized in that said fourth monomer mixture contains both urea and melamine, and formalin in the mole ratio of from 30:55 to 75:30.
Claim 18
Dependent Claim
84 words
The process according to claim 1, characterized in that said thermosetting resin is a resin composition having a viscosity of from 100 to 8000 cps at 25°C comprising: from 70 to 100 parts by weight of at least one compound selected from the group consisting of a fifth monomer mixture, phenol resin, furan resin and phenol modified furan co-condensate; and from 0 to 30 parts by weight of at least one compound selected from the group consisting of lignin, modified resin and modified cellulose.
Claim 19
Dependent Claim
26 words
The process according to claim 17, characterized in that said fifth monomer mixture contains phenol and formalin in the mole ratio of from 1:4 to 1:0.5.
Claim 20
Dependent Claim
27 words
The process according to claim 17, characterized in that said fifth monomer mixture contains furfuryl alcohol and formalin in the mole ratio of from 1:1.3 to 1:0.
Claim 21
Dependent Claim
30 words
The process according to claim 17, characterized in that said fifth monomer mixture includes both phenol and furfuryl alcohol, and formalin in the mole ratio of from 1:4 to 1:0.
Claim 22
Dependent Claim
26 words
A molded product made from a glasslike carbon material having minute pores therein, characterized in that said pores are no larger than 0.1 µm in diameter.
Claim 23
Dependent Claim
26 words
A molded product made from a glasslike carbon material having minute pores therein, characterized in that said pores are no larger than 0.1 µm in diameter.
Claim 24
Dependent Claim
16 words
The molded product according to claim 21, characterized in that it has a ground specular surface.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.