US4478957A
Expired / Lapsed
US
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Process for the production of highly resilient, cold-curing polyurethane foams
Assignee: Evonik Operations GmbH
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Filing: 1983-09-15
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Granted: 1984-10-23
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Expires: 2003-09-15
Abstract
Abstract The invention relates to a process for the manufacture of highly resilient, cold-curing polyurethane foams with the distinctive feature that polysiloxane-polyoxyalkylene block copolymers with the following characteristics are used as foam stabilizers: (a) the polysiloxane block is linear or branched and contains an average of 4 to 25 silicon atoms, wherein the organic radicals linked to the silicon atoms are polyoxyalkylene or methyl radicals and up to 30% of the methyl radicals can be replaced by substituted alkyl radicals with 1 to 4 carbon atoms, and/or phenyl radicals, and mixtures thereof; (b) the polyoxyalkylene portion consists of at least two polyoxyalkylene blocks, A 1 and A 2 , which are formed from oxyethylene and oxypropylene units, wherein block A 1 is formed from 45 to 100 mole percent of oxyethylene units and 55 to 0 mole percent of oxypropylene units and block A 2 is formed from 0 to 50 mole percent of oxyethylene units and 100 to 50 mole percent of oxypropylene units, the molecular weight of the polyoxyalkylene blocks A 1 and A 2 in each case being 150 to 1,200 and the molar ratio of blocks A 1 :A 2 falling in the range of 20:80 to 80:20; and (c) the polysiloxane block is linked to the polyoxyalkylene blocks by SiOC or SiC bridges, 1.5 to 10 polyoxyalkylene blocks being linked to each polysiloxane block on the average. The stabilizers have improved stabilizing properties and form open-cell foams at a relatively wide processing latitude.
Inventors
- 👤 Bernd-Juergen Klietsch
- 👤 Hans-Joachim Kollmeier
- 👤 Helmut Lammerting
- 👤 Rolf-Dieter Langenhagen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:18
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0061; C08J2375/00; C08J2375/04; C08J2483/00; Y; Y10; Y10S; Y10S521/00; Y10S521/904
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
285 words
In a process for the manufacture of highly resilient, cold-curing polyurethane foams wherein polyisocyanates which are at least difunctional are reacted with polyols having at least two hydroxyl groups per molecule, of which at least 40% on the average are primary hydroxyl groups, the polyols having an equivalent weight per hydroxyl group of 700 to 3,000, in the presence of catalysts, blowing agents, emulsifiers, and foam stabilizers, the improvement which comprises using as the foam stabilizer, polysiloxane-polyoxyalkylene block copolymers wherein (a) the polysiloxane block is linear or branched and contains an average of 4 to 25 silicon atoms, wherein the organic radicals linked to the silicon atoms are polyoxyalkylene or methyl radicals and up to 30% of the methyl radicals can be replaced by radicals selected from the group consisting of substituted alkyl radicals with 1 to 4 carbon atoms, phenyl radicals, and mixtures thereof; (b) the polyoxyalkylene portion consists of at least two polyoxyalkylene blocks, A 1 and A 2 , which are formed from oxyethylene and oxypropylene units, wherein block A 1 is formed from 45 to 100 mole percent of oxyethylene units and 55 to 0 mole percent of oxypropylene units and block A 2 is formed from 0 to 50 mole percent of oxyethylene units and 100 to 50 mole percent of oxypropylene units, the molecular weight of the polyoxyalkylene blocks A 1 and A 2 in each case being 150 to 1,200 and the molar ratio of blocks A 1 :A 2 falling in the range of 20:80 to 80:20, and (c) the polysiloxane block is linked to the polyoxyalkylene blocks by SiOC or SiC bridges, 1.5 to 10 polyoxyalkylene blocks being linked to each polysiloxane block on the average.
Claim 2
Dependent Claim
285 words
In a process for the manufacture of highly resilient, cold-curing polyurethane foams wherein polyisocyanates which are at least difunctional are reacted with polyols having at least two hydroxyl groups per molecule, of which at least 40% on the average are primary hydroxyl groups, the polyols having an equivalent weight per hydroxyl group of 700 to 3,000, in the presence of catalysts, blowing agents, emulsifiers, and foam stabilizers, the improvement which comprises using as the foam stabilizer, polysiloxane-polyoxyalkylene block copolymers wherein (a) the polysiloxane block is linear or branched and contains an average of 4 to 25 silicon atoms, wherein the organic radicals linked to the silicon atoms are polyoxyalkylene or methyl radicals and up to 30% of the methyl radicals can be replaced by radicals selected from the group consisting of substituted alkyl radicals with 1 to 4 carbon atoms, phenyl radicals, and mixtures thereof; (b) the polyoxyalkylene portion consists of at least two polyoxyalkylene blocks, A 1 and A 2 , which are formed from oxyethylene and oxypropylene units, wherein block A 1 is formed from 45 to 100 mole percent of oxyethylene units and 55 to 0 mole percent of oxypropylene units and block A 2 is formed from 0 to 50 mole percent of oxyethylene units and 100 to 50 mole percent of oxypropylene units, the molecular weight of the polyoxyalkylene blocks A 1 and A 2 in each case being 150 to 1,200 and the molar ratio of blocks A 1 :A 2 falling in the range of 20:80 to 80:20, and (c) the polysiloxane block is linked to the polyoxyalkylene blocks by SiOC or SiC bridges, 1.5 to 10 polyoxyalkylene blocks being linked to each polysiloxane block on the average.
Claim 3
Dependent Claim
21 words
The process of claim 1 wherein the polysiloxane block is linear and contains an average of 4 to 15 silicon atoms.
Claim 4
Dependent Claim
25 words
The process of claim 1 wherein the molecular weight of the polyoxyalkylene blocks A 1 and A 2 is 300 to 1,000 in each case.
Claim 5
Dependent Claim
25 words
The process of claim 2 wherein the molecular weight of the polyoxyalkylene blocks A 1 and A 2 is 300 to 1,000 in each case.
Claim 6
Dependent Claim
20 words
The process of claim 1 wherein an average of 2 to 6 polyoxyalkylene blocks are linked to each polysiloxane block.
Claim 7
Dependent Claim
20 words
The process of claim 2 wherein an average of 2 to 6 polyoxyalkylene blocks are linked to each polysiloxane block.
Claim 8
Dependent Claim
20 words
The process of claim 3 wherein an average of 2 to 6 polyoxyalkylene blocks are linked to each polysiloxane block.
Claim 9
Dependent Claim
20 words
The process of claim 4 wherein an average of 2 to 6 polyoxyalkylene blocks are linked to each polysiloxane block.
Claim 10
Dependent Claim
13 words
A highly resilient, cold-curing polyurethane foam produced by the process of claim 1.
Claim 11
Dependent Claim
13 words
A highly resilient, cold-curing polyurethane foam produced by the process of claim 2.
Claim 12
Dependent Claim
13 words
A highly resilient, cold-curing polyurethane foam produced by the process of claim 3.
Claim 13
Dependent Claim
13 words
A highly resilient, cold-curing polyurethane foam produced by the process of claim 4.
Claim 14
Dependent Claim
13 words
A highly resilient, cold-curing polyurethane foam produced by the process of claim 5.
Claim 15
Dependent Claim
13 words
A highly resilient, cold-curing polyurethane foam produced by the process of claim 6.
Claim 16
Dependent Claim
13 words
A highly resilient, cold-curing polyurethane foam produced by the process of claim 7.
Claim 17
Dependent Claim
13 words
A highly resilient, cold-curing polyurethane foam produced by the process of claim 8.
References Cited (Backward Citations)
US3600418A
Cited
US3530159A
Cited
US3564037A
Cited
US3629165A
Cited
US3741917A
Cited
US3957843A
Cited
US4090987A
Cited
US4071483A
Cited
US4119582A
Cited
US4276385A
Cited
US4309508A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-10-23 | 1988-04-23 | 1988-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-23 | 1992-04-23 | 1992-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-23 | 1996-04-23 | 1996-10-23 | $7700.00 | Window Closed / Lapsed |