Patent US4306448A successfully refreshed from Google Patents.
Patent US3755242A successfully refreshed from Google Patents.
US3755242A
Expired / Lapsed
US
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Polycarbodiimide prepolymers
Assignee: 3M Co
•
Filing: 1972-04-10
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Granted: 1973-08-28
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Expires: 1992-04-10
Abstract
Abstract A new class of isocyanate-terminated solid, soluble, fusible, storable prepolymers suitable for producing high molecular weight polycarbodiimides; formed from polycarbodiimide-forming polyisocyanate monomers having a melting point below 200* C., said prepolymers comprising a mixture of liner chains of polycarbodiimides and said monomers, said mixture containing about 2 to 95 percent of the original isocyanate nitrogen in the form of polycarbodiimide. The prepolymer can be in admixture with a catalyst and solvent for said catalyst for further formation or polycarbodiimide.
Inventors
- 👤 C Reich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:29
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/77; C08G18/78; C08G18/79; C08G18/797; C08G18/02; C08G18/025; C08G18/08; C08G18/10
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
56 words
An isocyanate-terminated, soluble, storage-stable, fusible, solid prepolymer formed from polycarbodiimide-forming diisocyanate monomers which have melting points below 200* C. and which have an isocyanate equivalent weight of about 80-400, said prepolymer being in admixture with a catalyst for the formation of high molecular weight polycarbodiimide, said prepolymer comprising a mixture of linear chains having the formula:
Claim 2
Dependent Claim
13 words
Prepolymer according to claim 2 which is in a finely divided free-flowing form.
Claim 3
Dependent Claim
14 words
Prepolymer according to claim 1 in which the catalyst is a 1-substituted phospholene oxide.
Claim 4
Dependent Claim
11 words
Prepolymer according to claim 4 in which said catalyst is 1-phenyl-3-methyl-2-phospholene-1-oxide.
Claim 5
Dependent Claim
21 words
Prepolymer according to claim 1 containing from about 2-60 percent by volume of finely divided, solid filler substantially homogeneously distributed therein.
Claim 6
Dependent Claim
13 words
Prepolymer according to claim 6 which is in a finely divided, free-flowing form.
Claim 7
Dependent Claim
13 words
Prepolymer according to claim 6 in which said filler is finely divided aluminum.
Claim 8
Dependent Claim
21 words
Prepolymer of claim 1 containing from 40-60 percent by volume of finely divided filler suitable for use as a metal solder.
Claim 9
Dependent Claim
18 words
Prepolymer according to claim 1 in which said diisocyanate monomer is hydrocarbon glycol end-capped with an aromatic diisocyanate.
Claim 10
Dependent Claim
19 words
Prepolymer according to claim 1 in which said diisocyanate monomer is a polyalkyleneether glycol end-capped with an aromatic diisocyanate.
Claim 11
Dependent Claim
13 words
Prepolymer according to claim 11 wherein said polyalkyleneether glycol is a polyethyleneoxide glycol.
Claim 12
Dependent Claim
13 words
Prepolymer according to claim 11 wherein said polyalkyleneether glycol is a polypropyleneoxide glycol.
Claim 13
Dependent Claim
16 words
Prepolymer according to claim 1 wherein said diisocyanate monomer is thiodiethanol end-capped with an aromatic diisocyanate.
Claim 14
Dependent Claim
12 words
Prepolymer according to claim 10 wherein said hydrocarbon glycol is a 1,4-butanediol.
Claim 15
Dependent Claim
12 words
Prepolymer according to claim 10 wherein said hydrocarbon glycol is ethylene glycol.
Claim 16
Dependent Claim
12 words
Prepolymer according to claim 10 wherein said hydrocarbon glycol is propylene glycol.
Claim 17
Dependent Claim
14 words
The prepolymer according to claim 10 wherein said hydrocarbon glycol is an octylene glycol.
Claim 18
Dependent Claim
10 words
Prepolymer according to claim 1 in finely divided, free-flowing form.
Claim 19
Dependent Claim
11 words
Prepolymer according to claim 1 wherein said monomer is 2,4-tolylene diisocyanate.
Claim 20
Dependent Claim
14 words
Prepolymer according to claim 1 wherein said monomer is a mixture of 2,4-2,6-tolylene diisocyanate.
Claim 21
Dependent Claim
11 words
Prepolymer according to claim 1 in which said catalyst is 1-phenyl-3-methyl-2-phospholene-1-oxide.
Claim 22
Dependent Claim
21 words
Prepolymer according to claim 1 containing from about 2-60 percent by volume of finely divided, solid filler substantially homogeneously distributed therein.
Claim 23
Independent Claim
60 words
A method for producing an isocyanate-terminated, soluble, storage-stable, fusible, solid prepolymer formed from polycarbodiimide-forming polyisocyanate monomers which have melting points below 200* C. and which have an isocyanate equivalent weight of about 80-400, said prepolymer being in admixture with a catalyst for the formation of high molecular weight polycarbodiimide, said prepolymer comprising a mixture of linear chains having the formula:
Claim 24
Dependent Claim
14 words
The method according to claim 24 wherein said temperature is less than 50* C.
Claim 25
Dependent Claim
16 words
The method according to claim 24 wherein said monomer has an isocyanate functionality of about 2.0-2.15.
Claim 26
Dependent Claim
17 words
Prepolymer of claim 1 wherein said diisocyanate monomer is a polyester glycol end-capped with an aromatic diisocyanate.
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) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |