US4419261A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Impregnant for making semi-rigid or rigid resin foams
Assignee: SENTORARUKASEI KK
•
Filing: 1980-09-23
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Granted: 1983-12-06
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Expires: 2000-09-23
Abstract
Abstract An impregnant which is suitable for being applied to a once produced open-cellular, soft resin foam to change its physical properties to a desired extent depending on the purpose in end use, the impregnant comprising an isocyanate selected from 4.4'-diphenylmethanediisocyanate, tolylenediisocyanate or a mixture thereof admixed with a polyurethane prepolymer obtained by reacting an isocyanate selected from tolylenediisocyanate, 4.4'-diphenylmethanediisocyanate or a mixture thereof with a polyol, and optionally a solvent for the mixture in suitable amounts.
Inventors
- 👤 Nobuhiro Takahashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:58
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/10; C04; C04B; C04B41/00; C04B41/45; C04B41/46; C04B41/48; C04B41/488; C04B41/4884; C08J; C08J9/00; C08J9/36; C08J9/40; C08J9/42; C08J2205/00; C08J2205/08; C08J2205/10; C08J2375/00; C08J2375/04; C08J2475/00; Y; Y10; Y10T; Y10T428/00; Y10T428/23; Y10T428/233; Y10T428/31504; Y10T428/31551; Y10T428/31554
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
158 words
An impregnant for converting a soft resin foam of open cells to a semi-rigid or rigid resin foam consisting essentially of an isocyanate selected from the group consisting of 4.4'-diphenyl-methanediisocyanate, tolylenediisocyanate and a mixture thereof, and a polyurethane prepolymer obtained by reacting an isocyanate selected from the group consisting of tolylenediisocyanate, 4.4'-diphenylmethanediisocyanate and a mixture thereof with a polyol having a molecular weight of about 1500-4000 and 2-4 functional groups in such proportions that the content of NCO groups in the prepolymer is in the range of below 15%, and wherein the mixing ratio of the first-mentioned isocyanate to the prepolymer is in the range of 1:9 to 9:1 and an organic inert solvent mixed therewith, said solvent selected from the group consisting of aromatic hydrocarbons, aliphatic hydrocarbons, chlorinated hydrocarbons, esters of hydrocarbons and ketones of hydrocarbons, said organic inert solvent being mixed in such a manner that the viscosity of the thus-diluted impregnant is below 500 cps.
Claim 2
Dependent Claim
158 words
An impregnant for converting a soft resin foam of open cells to a semi-rigid or rigid resin foam consisting essentially of an isocyanate selected from the group consisting of 4.4'-diphenyl-methanediisocyanate, tolylenediisocyanate and a mixture thereof, and a polyurethane prepolymer obtained by reacting an isocyanate selected from the group consisting of tolylenediisocyanate, 4.4'-diphenylmethanediisocyanate and a mixture thereof with a polyol having a molecular weight of about 1500-4000 and 2-4 functional groups in such proportions that the content of NCO groups in the prepolymer is in the range of below 15%, and wherein the mixing ratio of the first-mentioned isocyanate to the prepolymer is in the range of 1:9 to 9:1 and an organic inert solvent mixed therewith, said solvent selected from the group consisting of aromatic hydrocarbons, aliphatic hydrocarbons, chlorinated hydrocarbons, esters of hydrocarbons and ketones of hydrocarbons, said organic inert solvent being mixed in such a manner that the viscosity of the thus-diluted impregnant is below 500 cps.
Claim 3
Dependent Claim
25 words
The impregnant according to claim 1, wherein the first-mentioned isocyanate is 4.4'-diphenylmethanediisocyanate and the prepolymer is a reaction product of tolyene diisocyanate and said polyol.
Claim 4
Dependent Claim
24 words
The impregnant according to claim 1, wherein the first-mentioned isocyanate is 4.4'-diphenylmethanediisocyanate and the prepolymer is a reaction product of 4.4'-diphenylmethanediisocyanate and said polyol.
Claim 5
Dependent Claim
29 words
The impregnant according to claim 1, wherein the first-mentioned isocyanate is 4.4'-diphenylmethanediisocyanate and the prepolymer is a reaction product of the mixture of tolylenediisocyanate and 4.4'-diphenylmethanediisocyanate and said polyol.
Claim 6
Dependent Claim
24 words
The impregnant according to claim 1, wherein the first-mentioned isocyanate is tolylenediisocyanate and the prepolymer is a reaction product of tolylenediisocyanate and said polyol.
Claim 7
Dependent Claim
25 words
The impregnant according to claim 1, wherein the first-mentioned isocyanate is tolylenediisocyanate and the prepolymer is the reaction product of 4.4'-diphenylmethane diisocyanate and said polyol.
Claim 8
Dependent Claim
29 words
The impregnant according to claim 1, wherein the first-mentioned isocyanate is tolylenediisocyanate and the prepolymer is a reaction product of a mixture of tolylenediisocyanate and 4.4'-diphenylmethanediisocyanate and said polyol.
Claim 9
Dependent Claim
29 words
The impregnant according to claim 1, wherein the first-mentioned isocyanate is a mixture of tolylenediisocyanate and 4.4'-diphenylmethanediisocyanate and the prepolymer is a reaction product of tolylenediisocyanate and said polyol.
Claim 10
Dependent Claim
29 words
The impregnant according to claim 1, wherein the first-mentioned isocyanate is a mixture of tolylenediisocyanate and 4.4'-diphenylmethanediisocyanate and the prepolymer is the reaction product of 4.4'-diphenylmethanediisocyanate and said polyol.
Claim 11
Dependent Claim
34 words
The impregnant according to claim 1, wherein the first-mentioned isocyanate is a mixture of tolylenediisocyanate and 4.4'-diphenylmethanediisocyanate and the prepolymer is a reaction product of a mixture of tolylenediisocyanate and 4.4'-diphenylmethanediisocyanate and said polyol.
Claim 12
Dependent Claim
32 words
A solvent according to claim 1 selected from the group consisting of benzene, toluene, xylene, chlorobenzene, normal hexane, methylene chloride, 1,1,1-trichloroethane, propylene dichloride, ethyl acetate, butyl acetate, acetone and methyl ethyl ketone.
Claim 13
Dependent Claim
23 words
An impregnant according to claim 1 in which a mixture of the ratio of the first mentioned isocyanate to the prepolymer is 1:9.
Claim 14
Dependent Claim
23 words
An impregnant according to claim 1 in which a mixture of the ratio of the first mentioned isocyanate to the prepolymer is 2:8.
Claim 15
Dependent Claim
23 words
An impregnant according to claim 1 in which a mixture of the ratio of the first mentioned isocyanate to the prepolymer is 3:7.
Claim 16
Dependent Claim
23 words
An impregnant according to claim 1 in which a mixture of the ratio of the first mentioned isocyanate to the prepolymer is 4:6.
Claim 17
Dependent Claim
23 words
An impregnant according to claim 1 in which a mixture of the ratio of the first mentioned isocyanate to the prepolymer is 5:5.
Claim 18
Dependent Claim
23 words
An impregnant according to claim 1 in which a mixture of the ratio of the first mentioned isocyanate to the prepolymer is 6:4.
Claim 19
Dependent Claim
23 words
An impregnant according to claim 1 in which a mixture of the ratio of the first mentioned isocyanate to the prepolymer is 7:3.
Claim 20
Dependent Claim
23 words
An impregnant according to claim 1 in which a mixture of the ratio of the first mentioned isocyanate to the prepolymer is 8:2.
Claim 21
Dependent Claim
23 words
An impregnant according to claim 1 in which a mixture of the ratio of the first mentioned isocyanate to the prepolymer is 9:1.
Claim 22
Dependent Claim
21 words
A soft resin foam having open cells in its structure impregnated with the impregnant of any of claims 1, or 12-20.
References Cited (Backward Citations)
US4210726A
Cited
US4258140A
Cited
US4184022A
Cited
US4214055A
Cited
US4239642A
Cited
US4247655A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-12-05 | 1987-06-06 | 1987-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-12-05 | 1991-06-06 | 1991-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-12-05 | 1995-06-06 | 1995-12-06 | $7700.00 | Window Closed / Lapsed |