US5264518A
Expired / Lapsed
US
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Polycarbodiimide pulp and process for producing thereof
Assignee: Nisshinbo Holdings Inc
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Filing: 1992-07-01
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Granted: 1993-11-23
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Expires: 2012-07-01
Abstract
Abstract The present invention is intended to provide a polycarbodiimide pulp improved in heat resistance, etc. and a process allowing for easy production of said polycarbodiimide pulp. The polycarbodiimide pulp of the present invention consists substantially of a polycarbodiimide represented by one of the following formula ##STR1## wherein R 1 , R 2 and R 3 each represent a lower alkyl group or a lower alkoxy group, R 4 and R 5 each represent a hydrogen atom, a lower alkyl group or a lower alkoxy group, and X represents an oxygen atom or a methylene group.
Inventors
- 👤 Satoshi Amano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:58
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/02; C08G18/025; D; D01; D01F; D01F6/00; D01F6/02; D01F6/18; D01F6/58; D01F6/76
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
43 words
A polycarbodiimide pulp consisting essentially of a polycarbodiimide represented by the following repeating units ##STR8## wherein R 1 represents a lower alkyl group or a lower alkoxy group, said polycarbodiimide having a molecular weight of at least 2000 and being in pulp-like form.
Claim 2
Dependent Claim
43 words
A polycarbodiimide pulp consisting essentially of a polycarbodiimide represented by the following repeating units ##STR8## wherein R 1 represents a lower alkyl group or a lower alkoxy group, said polycarbodiimide having a molecular weight of at least 2000 and being in pulp-like form.
Claim 3
Dependent Claim
47 words
A polycarbodiimide pulp consisting essentially of a polycarbodiimide represented by the following repeating units ##STR9## wherein R 2 and R 3 each represent a lower alkyl group or a lower alkoxy group said polycarbodiimide having a molecular weight of at least 2000 and being in pulp-like form.
Claim 4
Dependent Claim
47 words
A polycarbodiimide pulp consisting essentially of a polycarbodiimide represented by the following repeating units ##STR9## wherein R 2 and R 3 each represent a lower alkyl group or a lower alkoxy group said polycarbodiimide having a molecular weight of at least 2000 and being in pulp-like form.
Claim 5
Dependent Claim
60 words
A polycarbodiimide pulp consisting essentially of a polycarbodiimide represented by the following repeating units ##STR10## wherein R 4 and R 5 each represent a hydrogen atom, a lower alkyl group or a lower alkoxy group, and X represents an oxygen atom or a methylene group, said polycarbodiimide having a molecular weight of at least 2000 and being in pulp-like form.
Claim 6
Dependent Claim
60 words
A polycarbodiimide pulp consisting essentially of a polycarbodiimide represented by the following repeating units ##STR10## wherein R 4 and R 5 each represent a hydrogen atom, a lower alkyl group or a lower alkoxy group, and X represents an oxygen atom or a methylene group, said polycarbodiimide having a molecular weight of at least 2000 and being in pulp-like form.
Claim 7
Dependent Claim
23 words
A polycarbodiimide pulp according to any one of claims 1 to 3, which has a thermal decomposition temperature of 450° C. or above.
Claim 8
Dependent Claim
83 words
A process for producing a polycarbodiimide pulp, consisting essentially of polymerizing an organic diisocyanate in the presence of a carbodiimidization catalyst in an alicyclic ether as a polymerization solvent to obtain a dope containing a polycarbodiimide having an NCO content of 3% or less and then discharging the dope and a coagulating solution containing, as the main component, a poor solvent for the polycarbodiimide, through nozzle(s) to allow the dope and the coagulating solution to contact with each other to pulp the polycarbodiimide.
Claim 9
Dependent Claim
83 words
A process for producing a polycarbodiimide pulp, consisting essentially of polymerizing an organic diisocyanate in the presence of a carbodiimidization catalyst in an alicyclic ether as a polymerization solvent to obtain a dope containing a polycarbodiimide having an NCO content of 3% or less and then discharging the dope and a coagulating solution containing, as the main component, a poor solvent for the polycarbodiimide, through nozzle(s) to allow the dope and the coagulating solution to contact with each other to pulp the polycarbodiimide.
Claim 10
Dependent Claim
100 words
A process for producing a polycarbodiimide pulp, consisting essentially of polymerizing an organic diisocyanate in the presence of a carbodiimidization catalyst in an alicyclic ether as a polymerization solvent to obtain a dope containing a polycarbodiimide having an NCO content of 3% or less and then discharging the dope and a coagulating solution containing, as the main component, a poor solvent for the polycarbodiimide, through nozzle(s) into or onto a coagulating bath containing, as the main component, a poor solvent for the polycarbodiimide while allowing the dope and the coagulating solution to contact with each other, to pulp the polycarbodiimide.
Claim 11
Dependent Claim
100 words
A process for producing a polycarbodiimide pulp, consisting essentially of polymerizing an organic diisocyanate in the presence of a carbodiimidization catalyst in an alicyclic ether as a polymerization solvent to obtain a dope containing a polycarbodiimide having an NCO content of 3% or less and then discharging the dope and a coagulating solution containing, as the main component, a poor solvent for the polycarbodiimide, through nozzle(s) into or onto a coagulating bath containing, as the main component, a poor solvent for the polycarbodiimide while allowing the dope and the coagulating solution to contact with each other, to pulp the polycarbodiimide.
Claim 12
Dependent Claim
102 words
A process according to claim 5 or 6, wherein the organic diisocyanate is a compound represented by the following formula ##STR11## wherein R 1 represents a lower alkyl group or a lower alkoxy group, or the following formula ##STR12## wherein R 2 and R 3 each represent a lower alkyl group or a lower alkoxy group, or the following formula ##STR13## wherein R 4 and R 5 each represent a hydrogen atom, a lower alkyl group or a lower alkoxy group, and X represents an oxygen atom or a methylene group, or a mixture of the compounds represented by the above formulas.
Claim 13
Dependent Claim
15 words
A process according to claim 7, wherein the organic diisocyanate is blocked at the terminals.
Claim 14
Dependent Claim
20 words
A process according to claim 5 or 6, wherein the alicyclic ether is tetrahydrofuran, dioxane, tetrahydropyran or a mixture thereof.
Claim 15
Dependent Claim
25 words
A process according to claim 5 or 6, wherein the poor solvent for the polycarbodiimide in the coagulating solvent and/or the coagulating bath is water.
Claim 16
Dependent Claim
21 words
A process according to claim 5 or 6, wherein the poor solvent for the polycarbodiimide in the coagulating bath is heated.
Claim 17
Dependent Claim
21 words
A process according to claim 5 or 6, wherein the dope and the coagulating solution are discharged through a double-fluid nozzle.
Claim 18
Dependent Claim
21 words
A process according to claim 5 or 6, wherein the dope and the coagulating solution are discharged through respective single-fluid nozzles.
Claim 19
Dependent Claim
17 words
A process according to claim 5 or 6, wherein the dope and/or the coagulating solution is heated.
Claim 20
Dependent Claim
13 words
A polycarbodiimide pulp produced by the process according to claim 5 or 6.
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) | 1996-11-22 | 1997-05-24 | 1997-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-11-22 | 2001-05-24 | 2001-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-11-22 | 2005-05-24 | 2005-11-23 | $7700.00 | Window Closed / Lapsed |