US4232608A
Expired / Lapsed
US
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Dimer isocyanate liner compositions
Assignee: Aerojet Rocketdyne Inc
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Filing: 1978-12-04
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Granted: 1980-11-11
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Expires: 1998-12-04
Abstract
Abstract A composition is disclosed in which a solid isocyanate compound such as toluene-diisocyanate dimer is dispersed within a polyurethane based on a hydroxy-terminated organic compound, preferably polybutadiene. 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
2026-10-23 15:55
CPC Classifications
F; F02; F02K; F02K9/00; F02K9/08; F02K9/32; F02K9/34; F02K9/346; C; C06; C06B; C06B45/00; C06B45/04; C06B45/06; C06B45/10; C06B45/12; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/67; C08G18/69; C08G18/70; C08G18/72; C08G18/77; C08G18/78; C08G18/79; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31536; Y10T428/31551; Y10T428/31554
Claims Analysis
Total Claims: 30
Claim 1
Independent Claim
116 words
A method of improving the adherence of a layer of a first composition containing organic active hydrogen compounds to a surface comprising the steps of: applying to said surface a film of a composition comprising polyurethane forming components having dispersed therein a stable, solid polyisocyanate precursor additive in an amount in excess of the amount necessary to form the polyurethane and which is reactive after cure of the composition with said compounds; curing said composition to form a polyurethane film containing excess stable, solid polyisocyanate precursor additive; applying said layer to said film; and curing said layer and reacting said active hydrogen compounds with said excess additive to form bonds binding said film to said layer.
Claim 2
Independent Claim
116 words
A method of improving the adherence of a layer of a first composition containing organic active hydrogen compounds to a surface comprising the steps of: applying to said surface a film of a composition comprising polyurethane forming components having dispersed therein a stable, solid polyisocyanate precursor additive in an amount in excess of the amount necessary to form the polyurethane and which is reactive after cure of the composition with said compounds; curing said composition to form a polyurethane film containing excess stable, solid polyisocyanate precursor additive; applying said layer to said film; and curing said layer and reacting said active hydrogen compounds with said excess additive to form bonds binding said film to said layer.
Claim 3
Dependent Claim
20 words
A method according to claim 1 in which the additive is a solid up to a temperature of 150° F.
Claim 4
Dependent Claim
20 words
A method according to claim 1 in which the additive is present in an amount from 2-10% of the composition.
Claim 5
Dependent Claim
35 words
A method according to claim 1 in which the additive is selected from compounds of the formula: ##STR4## where R is an aliphatic or aromatic group and n is an integer from 0 to 1.
Claim 6
Dependent Claim
21 words
A method according to claim 4 in which R is lower alkyl or aryl and contains at least one -NCO group.
Claim 7
Dependent Claim
30 words
A method according to claim 5 in which the additive is a dimer selected from those of the formula: ##STR5## where R 2 is arylene, alkyl arylene or aryl alkylene.
Claim 8
Dependent Claim
28 words
A method according to claim 6 in which the additive is a dimer of members selected from the group consisting of toluene diisocyanate, 4,4'-diphenylmethane diisocyanate and bis-phenyl diisocyanate.
Claim 9
Dependent Claim
16 words
A method according to claim 7 in which the additive is a dimer of toluene diisocyanate.
Claim 10
Dependent Claim
40 words
A method according to claim 1 in which the composition includes at least one polyol and an amount of polyisocyanate sufficient to react with said polyol, and said additive is present in an amount over the stoichiometric amount for cure.
Claim 11
Dependent Claim
13 words
A method according to claim 9 in which the polyisocyanate is toluene diisocyanate.
Claim 12
Dependent Claim
30 words
A method according to claim 9 in which the polyol is present in an amount of 20-65 parts by weight of the composition and comprises a liquid hydroxyl containing prepolymer.
Claim 13
Dependent Claim
29 words
A method according to claim 11 in which the prepolymer is a conjugated diene polymer having an equivalent weight from 1000-5000 and a functionality from about 1.7 to 3.0.
Claim 14
Independent Claim
127 words
A method of improving the adherence of a solid rocket propellant to a rocket motor casing containing the propellant which comprises: applying to said casing a layer of a composition comprising polyurethane forming components having dispersed therein a stable, solid polyisocyanate precursor additive in an amount in excess of the amount necessary to form the polyurethane, which excess is reactive, after cure of the composition, with organic active hydrogen compounds; curing said composition to form a polyurethane liner containing excess additive; applying to said polyurethane liner a layer of a curable propellant composition containing organic active hydrogen compounds; and curing said propellant composition and reacting said active hydrogen compounds with said excess additive to form a solid rocket propellant having bonds binding said propellant to said liner.
Claim 15
Independent Claim
127 words
A method of improving the adherence of a solid rocket propellant to a rocket motor casing containing the propellant which comprises: applying to said casing a layer of a composition comprising polyurethane forming components having dispersed therein a stable, solid polyisocyanate precursor additive in an amount in excess of the amount necessary to form the polyurethane, which excess is reactive, after cure of the composition, with organic active hydrogen compounds; curing said composition to form a polyurethane liner containing excess additive; applying to said polyurethane liner a layer of a curable propellant composition containing organic active hydrogen compounds; and curing said propellant composition and reacting said active hydrogen compounds with said excess additive to form a solid rocket propellant having bonds binding said propellant to said liner.
Claim 16
Dependent Claim
112 words
An assembly having improved bonding between layers comprising in combination: a first layer comprising polyurethane formed by cure of a first composition comprising polyurethane forming components in which is dispersed a stable, solid polyisocyanate precursor additive in excess of the amount necessary to form said polyurethane and which excess additive is reactive after cure of the composition with organic active hydrogen compounds; and a second layer adhered to said first layer, said second layer being formed by applying a second composition containing organic active hydrogen compounds to said first layer and curing said second composition, said active hydrogen compounds being reacted with said excess additive to form interfacial bonds between said layers.
Claim 17
Dependent Claim
112 words
An assembly having improved bonding between layers comprising in combination: a first layer comprising polyurethane formed by cure of a first composition comprising polyurethane forming components in which is dispersed a stable, solid polyisocyanate precursor additive in excess of the amount necessary to form said polyurethane and which excess additive is reactive after cure of the composition with organic active hydrogen compounds; and a second layer adhered to said first layer, said second layer being formed by applying a second composition containing organic active hydrogen compounds to said first layer and curing said second composition, said active hydrogen compounds being reacted with said excess additive to form interfacial bonds between said layers.
Claim 18
Dependent Claim
21 words
An assembly according to claim 14 in which the additive is a solid up to a temperature of about 150° F.
Claim 19
Dependent Claim
20 words
An assembly according to claim 14 in which the additive is present in an amount from 2-10% of the composition.
Claim 20
Dependent Claim
35 words
An additive according to claim 14 in which the additive is selected from compounds of the formula: ##STR6## where R is an aliphatic or aromatic group and N is an integer from 0 to 1.
Claim 21
Dependent Claim
21 words
An assembly according to claim 17 in which R is lower alkyl or aryl and contains at least one --NCO group.
Claim 22
Dependent Claim
30 words
An assembly according to claim 18 in which the additive is a dimer selected from those of the formula: ##STR7## where R 2 is arylene, alkyl arylene or aryl alkylene.
Claim 23
Dependent Claim
28 words
An assembly according to claim 19 in which the additive is a dimer of members selected from the group consisting of toluene diisocyanate, 4,4'-diphenylmethane diisocyanate and bis-phenyl diisocyanate.
Claim 24
Dependent Claim
16 words
An assembly according to claim 20 in which the additive is a dimer of toluene diisocyanate.
Claim 25
Dependent Claim
40 words
An assembly according to claim 14 in which the composition includes at least one polyol and an amount of polyisocyanate sufficient to react with said polyol, and said additive is present in an amount over the stoichiometric amount for cure.
Claim 26
Dependent Claim
13 words
An assembly according to claim 22 in which the polyisocyanate is toluene diisocyanate.
Claim 27
Dependent Claim
30 words
An assembly according to claim 22 in which the polyol is present in an amount of 20-65 parts by weight of the composition and comprises a liquid hydroxyl containing polymer.
Claim 28
Dependent Claim
29 words
An assembly according to claim 24 in which the prepolymer is a conjugated diene polymer having an equivalent weight from 1000-5000 and a functionality from about 1.7 to 3.0.
Claim 29
Dependent Claim
105 words
A solid propellant rocket motor comprising: a casing; a cured polyurethane liner within said casing formed by cure of a liner composition comprising polyurethane forming components in which is dispersed a stable, solid polyisocyanate precursor additive in excess of the amount necessary to form said polyurethane and which is reactive, after cure of the composition, with organic active hydrogen compounds; and propellant adhered to said liner formed by applying to said liner a propellant composition containing organic active hydrogen compounds and curing said propellant composition and reacting said active hydrogen compounds with said excess additive to form interfacial bonds between said liner and said propellant.
Claim 30
Dependent Claim
105 words
A solid propellant rocket motor comprising: a casing; a cured polyurethane liner within said casing formed by cure of a liner composition comprising polyurethane forming components in which is dispersed a stable, solid polyisocyanate precursor additive in excess of the amount necessary to form said polyurethane and which is reactive, after cure of the composition, with organic active hydrogen compounds; and propellant adhered to said liner formed by applying to said liner a propellant composition containing organic active hydrogen compounds and curing said propellant composition and reacting said active hydrogen compounds with said excess additive to form interfacial bonds between said liner and said propellant.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-11-11 | 1984-05-12 | 1984-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-11 | 1988-05-12 | 1988-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-11 | 1992-05-12 | 1992-11-11 | $7700.00 | Window Closed / Lapsed |