US4374208A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyether-urethane foams
Assignee: Dunlop Ltd
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Filing: 1981-11-24
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Granted: 1983-02-15
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Expires: 2001-11-24
Abstract
Abstract A method for the production of a polyether-urethane foam includes the step of incorporating into the foam-forming reaction mixture a degradation product of a starch and/or an acetyl, hydroxypropyl or oxidized derivative of a starch. This additive can be used to substitute up to 80% by weight of the polymeric polyol on which the foam formulation is based. The foams can be rigid, semi-rigid, semi-flexible or flexible and their physical and dynamic properties compare favorably with those of foams lacking the starch additive, while the production costs of the foams are significantly lowered.
Inventors
- 👤 John C. J. Fallows
- 👤 Richard G. Harvey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 01:31
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/64; C08G18/6484; C08G2110/00; C08G2110/0008; C08G2110/0016; C08G2110/0025; C08G2110/0041; C08G2110/005; C08G2110/0083
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
135 words
A one-shot process for the production of a polyetherurethane foam by reacting in a foam-forming reaction mixture: (a) a polyoxyalkylene polyol containing at least two hydroxy groups per molecule, from 0 to 20% by weight polyoxyethylene groups and less than 20 mole percent primary hydroxyl groups and having a molecular weight in the range 1500 to 10000; (b) a tolylene diisocyanate; (c) a polyoxyalkylene/polysiloxane block copolymer of the type used in conventional (as opposed to high-resilience) urethane foam formulations: (d) a blowing agent and (e) at least one catalyst, wherein the reaction mixture additionally contains at least one substance selected from the group consisting of degradation products of a starch and starch derivatives having a degree of substitution less than 0.25, said degradation products and said derivatives containing up to 15% by weight of water.
Claim 2
Dependent Claim
135 words
A one-shot process for the production of a polyetherurethane foam by reacting in a foam-forming reaction mixture: (a) a polyoxyalkylene polyol containing at least two hydroxy groups per molecule, from 0 to 20% by weight polyoxyethylene groups and less than 20 mole percent primary hydroxyl groups and having a molecular weight in the range 1500 to 10000; (b) a tolylene diisocyanate; (c) a polyoxyalkylene/polysiloxane block copolymer of the type used in conventional (as opposed to high-resilience) urethane foam formulations: (d) a blowing agent and (e) at least one catalyst, wherein the reaction mixture additionally contains at least one substance selected from the group consisting of degradation products of a starch and starch derivatives having a degree of substitution less than 0.25, said degradation products and said derivatives containing up to 15% by weight of water.
Claim 3
Dependent Claim
18 words
The process of claim 1, wherein the polyoxyalkylene polyol contains less than 10 mole percent primary hydroxyl groups.
Claim 4
Dependent Claim
40 words
The process of claim 1, wherein the tolylene diisocyanate is a mixture of 2,4- and 2,6-tolylene diisocyanate, the ratio by weight of said 2,4-2,6-isomers being a ratio selected from the group consisting of 80:20, 65:35 and combinations of said mixtures.
Claim 5
Dependent Claim
11 words
The process of claim 1, wherein the blowing agent is water.
Claim 6
Dependent Claim
23 words
The process of claim 1, wherein the blowing agent is a halogenated hydrocarbon selected from the group consisting of trichlorofluoromethane and methylene dichloride.
Claim 7
Dependent Claim
27 words
The process of claim 1, wherein the catalyst is a tertiary amine selected from the group consisting of triethylene diamine, dimethyl ethanolamine, bis(dimethyl aminoethyl) ether and N-alkyl-morpholines.
Claim 8
Dependent Claim
24 words
The process of claim 1, wherein the catalyst is an organometallic compound selected from the group consisting of stannous octoate and dibutyl tin dilaurate.
Claim 9
Dependent Claim
13 words
The process of claim 1, wherein the starch degradation product is a dextrin.
Claim 10
Dependent Claim
23 words
The process of claim 1, wherein the starch derivative is selected from the group consisting of acetylated starches, oxidised starches and hydroxy-propylated starches.
Claim 11
Dependent Claim
17 words
The process of claim 1, wherein the starch derivative has a degree of substitution less than 0.10.
Claim 12
Dependent Claim
16 words
The process of claim 10, wherein the starch derivative has a degree of substitution of 0.05.
Claim 13
Dependent Claim
38 words
The process of claim 1, wherein said at least one substance selected from the group consisting of, degradation products of a starch and starch derivatives is used to substitute up to 80% by weight of said polyoxyalkylene polyol.
Claim 14
Dependent Claim
133 words
A polyether-urethane foam, said foam having been made by reacting in a foam-forming reaction mixture: (a) a polyoxyalkylene polyol containing at least two hydroxy groups per molecule, from 0 to 20% by weight polyoxyethylene groups and less than 20 mole percent primary hydroxyl groups and having a molecular weight in the range 1500 to 10000; (b) a tolylene diisocyanate; (c) a polyoxyalkylene/polysiloxane block copolymer of the type used in conventional (as opposed to high-resilience) urethane foam formulations; (d) a blowing agent and (e) at least one catalyst, wherein the reaction mixture additionally contains at least one substance selected from the group consisting of degradation products of a starch and starch derivatives having a degree of substitution less than 0.25, said degradation products and said derivatives containing up to 15% by weight of water.
Claim 15
Dependent Claim
133 words
A polyether-urethane foam, said foam having been made by reacting in a foam-forming reaction mixture: (a) a polyoxyalkylene polyol containing at least two hydroxy groups per molecule, from 0 to 20% by weight polyoxyethylene groups and less than 20 mole percent primary hydroxyl groups and having a molecular weight in the range 1500 to 10000; (b) a tolylene diisocyanate; (c) a polyoxyalkylene/polysiloxane block copolymer of the type used in conventional (as opposed to high-resilience) urethane foam formulations; (d) a blowing agent and (e) at least one catalyst, wherein the reaction mixture additionally contains at least one substance selected from the group consisting of degradation products of a starch and starch derivatives having a degree of substitution less than 0.25, said degradation products and said derivatives containing up to 15% by weight of water.
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) | 1986-02-14 | 1986-08-16 | 1987-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-02-14 | 1990-08-16 | 1991-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-02-14 | 1994-08-16 | 1995-02-15 | $7700.00 | Window Closed / Lapsed |