US3963680A
Expired / Lapsed
US
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One-part, room-temperature latent, curable isocyanate compositions
Assignee: 3M Co
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Filing: 1975-03-17
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Granted: 1976-06-15
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Expires: 1995-03-17
Abstract
Abstract A one-part, room-temperature latent, curable isocyanate composition is prepared comprising an aliphatic or aromatic polyisocyanate having dispersed therethrough capsules containing a viscous liquid catalyst solution capable of curing the polyisocyanate. The capsules comprise a shell wall of partially polymerized isocyanate, wherein the partially polymerized isocyanate contains linkages selected from the group consisting essentially of urea, urethane, and isocyanurate linkages.
Inventors
- 👤 Donald R. O'Keefe
- 👤 A. Joseph Gasper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:09
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/02; C08G18/022
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
145 words
In a one-part, room-temperature latent, curable isocyanate composition comprising: an aromatic polyisocyanate material; and an encapsulated liquid trimerization catalyst dispersed throughout said polyisocyanate, said liquid catalyst comprising a solution of a metal salt of an organic acid in a lower polyhydric alcohol and having a viscosity of greater than about 5,000 centipoise at 25°C, said liquid catalyst being encapsulated in capsules having a shell wall comprising partially polymerized isocyanate, said capsule shell wall being impermeable to said liquid catalyst at room temperature but permeable to said catalyst when activated by heat or solvent means; the improvement comprising the inclusion in said liquid catalyst of a primary or secondary organic polyfunctional amine in an amount of from about 1 to 25% by weight of said liquid catalyst, wherein said partially polymerized isocyanate contains linkages selected from the group consisting essentially of urea, urethane and isocyanate linkages.
Claim 2
Dependent Claim
145 words
In a one-part, room-temperature latent, curable isocyanate composition comprising: an aromatic polyisocyanate material; and an encapsulated liquid trimerization catalyst dispersed throughout said polyisocyanate, said liquid catalyst comprising a solution of a metal salt of an organic acid in a lower polyhydric alcohol and having a viscosity of greater than about 5,000 centipoise at 25°C, said liquid catalyst being encapsulated in capsules having a shell wall comprising partially polymerized isocyanate, said capsule shell wall being impermeable to said liquid catalyst at room temperature but permeable to said catalyst when activated by heat or solvent means; the improvement comprising the inclusion in said liquid catalyst of a primary or secondary organic polyfunctional amine in an amount of from about 1 to 25% by weight of said liquid catalyst, wherein said partially polymerized isocyanate contains linkages selected from the group consisting essentially of urea, urethane and isocyanate linkages.
Claim 3
Dependent Claim
13 words
The composition of claim 1 wherein said polyisocyanate comprises a polymethylene polyphenyl polyisocyanate.
Claim 4
Dependent Claim
19 words
The composition of claim 1 wherein said polyisocyanate comprises an isocyanate-terminated prepolymer comprising polyoxyalkylene terminated with an aromatic polyisocyanate.
Claim 5
Dependent Claim
17 words
The composition of claim 1 wherein said liquid catalyst comprises a solution of potassium lactate in glycerine.
Claim 6
Dependent Claim
13 words
The composition of claim 1 wherein said polyfunctional amine comprises a primary amine.
Claim 7
Dependent Claim
23 words
The composition of claim 5 wherein said primary organic polyfunctional amine comprises the amine terminated condensation product of a triol and propylene oxide.
Claim 8
Dependent Claim
41 words
The composition of claim 1 wherein there is further included in said composition an organic tertiary amine having a pK b of 6.5 or less in an amount of from about 3 to 25 percent by weight of said liquid catalyst.
Claim 9
Dependent Claim
12 words
The composition of claim 7 wherein said tertiary amine comprises N-methyldiethanol amine.
Claim 10
Dependent Claim
148 words
A one-part, room-temperature latent, curable isocyanate composition comprising: a polyisocyanate material selected from the group consisting of aromatic and aliphatic polyisocyanates; and an encapsulated liquid trimerization catalyst dispersed throughout said polyisocyanate, said liquid catalyst comprising a solution of a metal salt of an organic acid in a lower polyhydric alcohol and having a viscosity of greater than about 5,000 centipoise at 25°C, wherein a primary or secondary organic polyfunctional amine in an amount of from about 1 to 25 percent by weight of said liquid catalyst is included in said liquid catalyst, and wherein said liquid catalyst is encapsulated in capsules having a shell wall comprising partially polymerized isocyanate containing linkages selected from the group consisting essentially of urea, urethane and isocyanate linkages, said capsule shell wall being impermeable to said liquid catalyst at room temperature but permeable to said catalyst when activated by heat or solvent means.
Claim 11
Dependent Claim
148 words
A one-part, room-temperature latent, curable isocyanate composition comprising: a polyisocyanate material selected from the group consisting of aromatic and aliphatic polyisocyanates; and an encapsulated liquid trimerization catalyst dispersed throughout said polyisocyanate, said liquid catalyst comprising a solution of a metal salt of an organic acid in a lower polyhydric alcohol and having a viscosity of greater than about 5,000 centipoise at 25°C, wherein a primary or secondary organic polyfunctional amine in an amount of from about 1 to 25 percent by weight of said liquid catalyst is included in said liquid catalyst, and wherein said liquid catalyst is encapsulated in capsules having a shell wall comprising partially polymerized isocyanate containing linkages selected from the group consisting essentially of urea, urethane and isocyanate linkages, said capsule shell wall being impermeable to said liquid catalyst at room temperature but permeable to said catalyst when activated by heat or solvent means.
Claim 12
Dependent Claim
12 words
The composition of claim 9 wherein said polyisocyanate is an aliphatic polyisocyanate.
Claim 13
Dependent Claim
12 words
The composition of claim 10 wherein said aliphatic polyisocyanate comprises 4,4'-diisocyanato-biscyclohexyl methane.
Claim 14
Dependent Claim
12 words
The composition of claim 9 wherein said polyisocyanate is an aromatic polyisocyanate.
Claim 15
Dependent Claim
13 words
The composition of claim 12 wherein said aromatic polyisocyanate comprises polymethylene polyphenyl polyisocyanate.
Claim 16
Dependent Claim
17 words
The composition of claim 9 wherein said liquid catalyst comprises a solution of potassium lactate in glycerine.
Claim 17
Dependent Claim
13 words
The composition of claim 10 wherein said polyfunctional amine is a primary amine.
Claim 18
Dependent Claim
23 words
The composition of claim 15 wherein said primary organic polyfunctional amine comprises the amine terminated condensation product of a triol and propylene oxide.
Claim 19
Dependent Claim
41 words
The composition of claim 9 wherein there is further included in said composition an organic tertiary amine having a pK b of 6.5 or less in an amount of from about 3 to 25 percent by weight of said liquid catalyst.
Claim 20
Independent Claim
130 words
A method for forming a one-part, room-temperature latent, curable isocyanate composition comprising the steps of: blending a liquid trimerization catalyst solution comprising a solution of a metal salt of an organic acid in a lower polyhydric alcohol and having a viscosity of at least 5,000 centipoise at 25°C and containing from about 1 to 25 percent by weight of said solution of a primary or secondary organic polyfunctional amine, with a polyisocyanate selected from the group consisting of aromatic and aliphatic polyisocyanates under conditions of high shear to form a dispersion of droplets of said liquid catalyst solution in said polyisocyanate; and allowing a capsule shell wall of partially polymerized isocyanate to form about said droplets containing linkages selected from the group consisting essentially of urea, urethane and isocyanurate linkages.
Claim 21
Independent Claim
130 words
A method for forming a one-part, room-temperature latent, curable isocyanate composition comprising the steps of: blending a liquid trimerization catalyst solution comprising a solution of a metal salt of an organic acid in a lower polyhydric alcohol and having a viscosity of at least 5,000 centipoise at 25°C and containing from about 1 to 25 percent by weight of said solution of a primary or secondary organic polyfunctional amine, with a polyisocyanate selected from the group consisting of aromatic and aliphatic polyisocyanates under conditions of high shear to form a dispersion of droplets of said liquid catalyst solution in said polyisocyanate; and allowing a capsule shell wall of partially polymerized isocyanate to form about said droplets containing linkages selected from the group consisting essentially of urea, urethane and isocyanurate linkages.
Claim 22
Dependent Claim
18 words
The method of claim 18 wherein the method is carried out at a temperature not exceeding about 50°C.
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) | 1979-06-15 | 1979-12-15 | 1980-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-15 | 1983-12-15 | 1984-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-15 | 1987-12-15 | 1988-06-15 | $7700.00 | Window Closed / Lapsed |