US4187215A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymeric isocyanate-hydroxy terminated polybutadiene compositions
Assignee: Aerojet Rocketdyne Inc
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Filing: 1972-09-25
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Granted: 1980-02-05
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Expires: 1992-09-25
Abstract
Abstract A composition and method are disclosed in which a homopolymeric isocyanate such as a toluene diisocyanate polymer is formed IN SITU within a polyurethane composition containing a hydroxy-terminated organic compound, preferably a polybutadiene, an amount of self-polymerizable polyisocyanate in excess of the stoichiometric requirement, and a polymerization catalyst therefor. The composition can be fully cured on a surface and yet provides an excess of stable material, i.e. dormant isocyanate containing groups which are reactive on demand to strengthen interfaces with adjacent layers containing available hydroxyl groups, such as a layer of solid polyurethane-based propellant, without the need for intermediate reactive coatings.
Inventors
- 👤 John M. Wrightson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:58
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/77; C08G18/78; C08G18/79; C08G18/798; C06; C06B; C06B45/00; C06B45/04; C06B45/06; C06B45/10; C06B45/12; C08G18/28; C08G18/67; C08G18/69
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
70 words
A composition comprising in combination: organic compounds containing a plurality of hydroxyl groups capable of reacting with an isocyanato group; polyisocyanate of the general formula R(NCO) m in which R is a di-or polyvalent organic radical containing from 2-30 carbon atoms and m is 2,3, or 4; homopolymerizable polyisocyanate in excess of the stoichiometric amount necessary to form said polyurethane; and a catalyst in an amount effective for said homopolymerization.
Claim 2
Dependent Claim
70 words
A composition comprising in combination: organic compounds containing a plurality of hydroxyl groups capable of reacting with an isocyanato group; polyisocyanate of the general formula R(NCO) m in which R is a di-or polyvalent organic radical containing from 2-30 carbon atoms and m is 2,3, or 4; homopolymerizable polyisocyanate in excess of the stoichiometric amount necessary to form said polyurethane; and a catalyst in an amount effective for said homopolymerization.
Claim 3
Dependent Claim
26 words
A composition according to claim 1 in which the homopolymerizable polyisocyanate is present in an amount of 25 to 100% equivalent excess over said stoichiometric amount.
Claim 4
Dependent Claim
49 words
A method according to claim 2 in which the homopolymeric polyisocyanate has a molecular weight of at least 500 and is selected from compounds of the formula: ##STR3## where R is a divalent organic group selected from aromatic or aliphatic and x is an integer of at least 1.
Claim 5
Dependent Claim
16 words
A composition according to claim 3 in which R is selected from lower alkylene or phenylene.
Claim 6
Dependent Claim
21 words
A composition according to claim 4 in which the homopolymerizable polyisocyanate is selected from toluene diisocyanate, hexamethylene diisocyanate and metaphenylene diisocyanate.
Claim 7
Dependent Claim
24 words
A composition according to claim 2 in which the catalyst is present in an amount between 0.01 to 2% by weight of the composition.
Claim 8
Dependent Claim
29 words
A composition according to claim 6 in which the catalyst is selected from tertiary amines, trialkyl phosphates, alkali metal alkoxides, oxalic acid and soluble metal salts of organic acids.
Claim 9
Dependent Claim
14 words
A composition according to claim 7 in which the catalyst is a tertiary amine.
Claim 10
Dependent Claim
12 words
A composition according to claim 8 in which the catalyst is triethylamine.
Claim 11
Dependent Claim
38 words
A composition according to claim 2 in which the composition comprises in parts by weight: 20 to 65 parts of inert solid fillers; 4-10 parts of stabilizers and rheological control additives; and 3-20 parts of reactive prepolymer modifiers.
Claim 12
Dependent Claim
15 words
A composition according to claim 10 in which the reactive polymeric modifier comprises a triol.
Claim 13
Independent Claim
97 words
A method of forming a polyurethane comprising the steps of: forming a polymerizable composition comprising: organic compounds containing a plurality of hydroxyl groups capable of reacting with an isocyanato group; polyisocyanate of the general formula R(NCO) m in which R is a di-or polyvalent organic radical containing from 2-30 carbon atoms and M is 2,3, or 4; homopolymerizable polyisocyanate in an amount in excess of the amount necessary to form said polyurethane; and a catalyst in an amount effective for said homopolymerization; and curing said composition to form said polyurethane containing a dispersion therein of said homopolymer.
Claim 14
Independent Claim
97 words
A method of forming a polyurethane comprising the steps of: forming a polymerizable composition comprising: organic compounds containing a plurality of hydroxyl groups capable of reacting with an isocyanato group; polyisocyanate of the general formula R(NCO) m in which R is a di-or polyvalent organic radical containing from 2-30 carbon atoms and M is 2,3, or 4; homopolymerizable polyisocyanate in an amount in excess of the amount necessary to form said polyurethane; and a catalyst in an amount effective for said homopolymerization; and curing said composition to form said polyurethane containing a dispersion therein of said homopolymer.
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) | 1983-02-04 | 1983-08-06 | 1984-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-02-04 | 1987-08-06 | 1988-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-02-04 | 1991-08-06 | 1992-02-05 | $7700.00 | Window Closed / Lapsed |